1. The method for optimizing the layout design of the pneumatic support rods of the back door of the automobile is characterized by comprising the following steps of: according to the CAS model, prearranging a backdoor hinge and an air stay bar, and setting an air stay bar optimization area;

carrying out manufacturability judgment optimization screening and operability optimization screening on the gas strut optimization area to obtain an optimal solution;

the manufacturability judge optimizing screening comprises: screening the gas strut optimization area based on the set manufacturability conditions of the gas strut to obtain a manufacturability optimization area which accords with the manufacturability conditions of the gas strut; screening the manufacturability optimization area based on the set low-temperature initial closing force condition to obtain a low-temperature closing optimization area which accords with the low-temperature initial closing force condition;

the operability optimization screening comprises the following steps: screening the low-temperature closing optimization area based on the set normal-temperature opening and closing condition to obtain a normal-temperature optimization area meeting the normal-temperature opening and closing condition; screening the normal-temperature optimized area based on the set force value range of the gas strut, the self-closing potential energy of the backdoor and the operating force of the backdoor to obtain a final optimized area;

and selecting an optimal solution in the final optimization region, and obtaining optimal design parameters of the backdoor and optimal arrangement parameters of the air struts based on the optimal solution.

2. The method for optimizing the layout design of the pneumatic stay bar of the back door of the automobile as claimed in claim 1, wherein: the method for screening the gas strut optimization area based on the set manufacturability conditions of the gas strut comprises the following steps: selecting a group of design parameters in the gas strut optimization area, substituting the selected design parameters into a set gas strut manufacturability target function, if the gas strut manufacturability target function is met, listing the group of design parameters into the manufacturability optimization area, otherwise, not entering the manufacturability optimization area, adjusting variables related to gas strut arrangement optimization, and judging for the next time until all the design parameters in the gas strut optimization area are judged, so as to obtain the manufacturability optimization area.

3. The method for optimizing the layout design of the pneumatic stay bar of the back door of the automobile as claimed in claim 1, wherein: the method for screening the manufacturability optimization area based on the set low-temperature initial closing force condition comprises the following steps: selecting a group of design parameters in the manufacturability optimization area, substituting the selected design parameters into a set low-temperature initial closing force objective function, if the low-temperature initial closing force objective function is met, listing the group of design parameters into the low-temperature closing optimization area, otherwise, not entering the low-temperature closing optimization area, adjusting the force value of the gas strut, and carrying out the next judgment until the judgment of all the design parameters in the manufacturability optimization area is completed, so as to obtain the low-temperature closing optimization area.

4. The method for optimizing the layout design of the pneumatic stay bar of the back door of the automobile as claimed in claim 1, wherein: the method for screening the low-temperature closing optimization area based on the set normal-temperature opening and closing condition comprises the following steps: screening the low-temperature closing optimization area based on the set normal-temperature closing force decreasing condition to obtain a decreasing optimization area; screening the degressive optimization area based on the set normal-temperature balance angle closing condition to obtain a balance angle optimization area; screening the balance angle optimization area based on the set normal-temperature initial closing force condition to obtain a normal-temperature closing optimization area; and screening the normal-temperature closed optimization area based on the set normal-temperature initial opening force condition to obtain the normal-temperature optimization area.

5. The method for optimizing the layout design of the pneumatic stay bar of the back door of the automobile as claimed in claim 4, wherein: the method for screening the low-temperature closing optimization area based on the set normal-temperature closing force degressive condition comprises the following steps: selecting a group of design parameters in the low-temperature closing optimization area, substituting the selected design parameters into a set normal-temperature closing force degressive objective function, if the normal-temperature closing force degressive objective function is met, listing the group of design parameters into the degressive optimization area, otherwise, not entering the degressive optimization area, adjusting variables related to gas strut arrangement optimization and variables related to gas strut shape optimization, and carrying out next judgment until the judgment of all the design parameters in the low-temperature closing optimization area is completed to obtain the degressive optimization area.

6. The method for optimizing the layout design of the pneumatic stay bar of the back door of the automobile as claimed in claim 5, wherein: the method for screening the degressive optimization area based on the set normal-temperature closed balance angle condition comprises the following steps: selecting a group of design parameters in the degressive optimization area, substituting the selected design parameters into a set normal-temperature closing balance angle objective function, if the normal-temperature closing balance angle objective function is met, listing the group of design parameters into the balance angle optimization area, otherwise, not entering the balance angle optimization area, adjusting variables related to gas strut arrangement optimization and variables related to gas strut modeling optimization, and performing next judgment until the judgment of all the design parameters in the degressive optimization area is completed to obtain the balance angle optimization area.

7. The method for optimizing the layout design of the pneumatic stay bar of the back door of the automobile as claimed in claim 6, wherein: the method for screening the balance angle optimization area based on the set normal-temperature initial closing force condition comprises the following steps: selecting a group of design parameters in the balance angle optimization area, substituting the selected design parameters into a set normal-temperature initial closing force objective function, if the normal-temperature initial closing force objective function is met, listing the group of design parameters into the normal-temperature closing optimization area, otherwise, not entering the normal-temperature closing optimization area, adjusting variables related to air strut arrangement optimization and variables related to air strut modeling optimization, and performing next judgment until all the design parameters in the balance angle optimization area are judged, so that the normal-temperature closing optimization area is obtained.

8. The method for optimizing the layout design of the pneumatic stay bar of the back door of the automobile as claimed in claim 7, wherein: the method for screening the normal-temperature closed optimization area based on the set normal-temperature initial opening force condition comprises the following steps: selecting a group of design parameters in the normal-temperature closing optimization area, substituting the selected design parameters into a set normal-temperature initial opening force objective function, if the set design parameters meet the normal-temperature initial opening force objective function, listing the set design parameters into the normal-temperature optimization area, otherwise, not entering the normal-temperature optimization area, adjusting variables related to the gas strut arrangement optimization and variables related to the gas strut model optimization, and performing next judgment until the judgment of all the design parameters in the normal-temperature closing optimization area is completed to obtain the normal-temperature optimization area.

9. The method for optimizing the layout design of the pneumatic stay bar of the back door of the automobile as claimed in claim 1, wherein: the method for screening the normal-temperature optimized area based on the set air stay bar force value range, the back door closing potential energy and the back door operating force comprises the following steps: screening the normal-temperature optimized area based on the set force value range of the gas strut to obtain the optimized area of the force value of the gas strut; screening the optimal area of the force value of the gas strut based on the set self-closing potential energy range of the backdoor to obtain an optimal area of closing potential energy; and screening the closed potential energy optimization area based on the set range of the back door operation force value to obtain a final optimization area.

10. The method for optimizing the layout design of the pneumatic stay bars of the back door of the automobile as claimed in any one of claims 5 to 8, wherein: the variables related to the arrangement optimization of the gas struts comprise the position coordinates of a back door of the gas struts installed on the back door and the position coordinates of a vehicle body of the gas struts installed on the vehicle body; (ii) a The variables related to the optimization of the gas strut modeling comprise a hinge axis X-direction optimization parameter and a hinge axis Y-direction optimization parameter.

Background

The controllability of the back door is an important content in the convenience of the operation of the opening and closing piece of the passenger car, and directly influences important factors of customer purchase and subsequent brand recognition, and each large host factory invests a great deal of energy to research and improve the control comfort of products so as to improve the competitiveness of the products. Therefore, a key technology is urgently needed to be established, the control comfort and the perception experience of customers are improved, and the product soft strength and the brand image are improved.

The traditional backdoor maneuverability optimizing thought: the method comprises the steps of arranging air struts aiming at a CAS surface of modeling output, then calculating maneuverability according to an EXCEL table, if the operability is not met, trying to change the positions of the air struts and input parameters, and calculating again until a change scheme meets target requirements, wherein the method is a method of debugging while trying.

Checking according to this method has two drawbacks: 1. the EXCEL calculation cannot obtain an optimal solution, the optimization direction is not clear, exhaustive and empirical arrangement is adopted, the modeling, the vehicle body structure and the man-machine arrangement are influenced, and the adjustment target and the adjustment direction are not clear; 2. the arrangement efficiency is low, the adjustment and optimization are carried out while the operability is tested, and if the target is not met, the optimal scheme changing time is delayed.

Disclosure of Invention

The invention aims to solve the defects of the background technology and provides an optimization method for the layout design of the pneumatic stay bar of the back door of the automobile.

The technical scheme of the invention is as follows: a layout design optimization method for pneumatic support rods of an automobile back door comprises the steps of pre-arranging a back door hinge and a pneumatic support rod according to a CAS model, and setting an optimized area of the pneumatic support rod;

carrying out manufacturability judgment optimization screening and operability optimization screening on the gas strut optimization area to obtain an optimal solution;

the manufacturability judge optimizing screening comprises: screening the gas strut optimization area based on the set manufacturability conditions of the gas strut to obtain a manufacturability optimization area which accords with the manufacturability conditions of the gas strut; screening the manufacturability optimization area based on the set low-temperature initial closing force condition to obtain a low-temperature closing optimization area which accords with the low-temperature initial closing force condition;

the operability optimization screening comprises the following steps: screening the low-temperature closing optimization area based on the set normal-temperature opening and closing condition to obtain a normal-temperature optimization area meeting the normal-temperature opening and closing condition; screening the normal-temperature optimized area based on the set force value range of the gas strut, the self-closing potential energy of the backdoor and the operating force of the backdoor to obtain a final optimized area;

and selecting an optimal solution in the final optimization region, and obtaining optimal design parameters of the backdoor and optimal arrangement parameters of the air struts based on the optimal solution.

The method for screening the gas strut optimization area based on the set manufacturability conditions of the gas strut further comprises the following steps: selecting a group of design parameters in the gas strut optimization area, substituting the selected design parameters into a set gas strut manufacturability target function, if the gas strut manufacturability target function is met, listing the group of design parameters into the manufacturability optimization area, otherwise, not entering the manufacturability optimization area, adjusting variables related to gas strut arrangement optimization, and judging for the next time until all the design parameters in the gas strut optimization area are judged, so as to obtain the manufacturability optimization area.

The method for screening the manufacturability optimization area based on the set low-temperature initial closing force condition comprises the following steps: selecting a group of design parameters in the manufacturability optimization area, substituting the selected design parameters into a set low-temperature initial closing force objective function, if the low-temperature initial closing force objective function is met, listing the group of design parameters into the low-temperature closing optimization area, otherwise, not entering the low-temperature closing optimization area, adjusting the force value of the gas strut, and carrying out the next judgment until the judgment of all the design parameters in the manufacturability optimization area is completed, so as to obtain the low-temperature closing optimization area.

The method for screening the low-temperature closing optimization area based on the set normal-temperature opening and closing condition further comprises the following steps of: screening the low-temperature closing optimization area based on the set normal-temperature closing force decreasing condition to obtain a decreasing optimization area; screening the degressive optimization area based on the set normal-temperature balance angle closing condition to obtain a balance angle optimization area; screening the balance angle optimization area based on the set normal-temperature initial closing force condition to obtain a normal-temperature closing optimization area; and screening the normal-temperature closed optimization area based on the set normal-temperature initial opening force condition to obtain the normal-temperature optimization area.

The method for screening the low-temperature closing optimization area based on the set normal-temperature closing force degressive condition further comprises the following steps of: selecting a group of design parameters in the low-temperature closing optimization area, substituting the selected design parameters into a set normal-temperature closing force degressive objective function, if the normal-temperature closing force degressive objective function is met, listing the group of design parameters into the degressive optimization area, otherwise, not entering the degressive optimization area, adjusting variables related to gas strut arrangement optimization and variables related to gas strut shape optimization, and carrying out next judgment until the judgment of all the design parameters in the low-temperature closing optimization area is completed to obtain the degressive optimization area.

The method for screening the degressive optimization area based on the set normal-temperature closed balance angle condition further comprises the following steps of: selecting a group of design parameters in the degressive optimization area, substituting the selected design parameters into a set normal-temperature closing balance angle objective function, if the normal-temperature closing balance angle objective function is met, listing the group of design parameters into the balance angle optimization area, otherwise, not entering the balance angle optimization area, adjusting variables related to gas strut arrangement optimization and variables related to gas strut modeling optimization, and performing next judgment until the judgment of all the design parameters in the degressive optimization area is completed to obtain the balance angle optimization area.

The method for screening the balance angle optimization area based on the set normal-temperature initial closing force condition further comprises the following steps: selecting a group of design parameters in the balance angle optimization area, substituting the selected design parameters into a set normal-temperature initial closing force objective function, if the normal-temperature initial closing force objective function is met, listing the group of design parameters into the normal-temperature closing optimization area, otherwise, not entering the normal-temperature closing optimization area, adjusting variables related to air strut arrangement optimization and variables related to air strut modeling optimization, and performing next judgment until all the design parameters in the balance angle optimization area are judged, so that the normal-temperature closing optimization area is obtained.

The method for screening the normal-temperature closing optimization area based on the set normal-temperature initial opening force condition further comprises the following steps of: selecting a group of design parameters in the normal-temperature closing optimization area, substituting the selected design parameters into a set normal-temperature initial opening force objective function, if the set design parameters meet the normal-temperature initial opening force objective function, listing the set design parameters into the normal-temperature optimization area, otherwise, not entering the normal-temperature optimization area, adjusting variables related to the gas strut arrangement optimization and variables related to the gas strut model optimization, and performing next judgment until the judgment of all the design parameters in the normal-temperature closing optimization area is completed to obtain the normal-temperature optimization area.

The method for screening the normal-temperature optimized area based on the set air stay rod force value range, the back door closing potential energy and the back door operation force comprises the following steps: screening the normal-temperature optimized area based on the set force value range of the gas strut to obtain the optimized area of the force value of the gas strut; screening the optimal area of the force value of the gas strut based on the set self-closing potential energy range of the backdoor to obtain an optimal area of closing potential energy; and screening the closed potential energy optimization area based on the set range of the back door operation force value to obtain a final optimization area.

Further, the variables related to the optimization of the arrangement of the air struts comprise the position coordinates of a back door on which the air struts are installed on the back door and the position coordinates of a vehicle body on which the air struts are installed on the vehicle body; (ii) a The variables related to the optimization of the gas strut modeling comprise a hinge axis X-direction optimization parameter and a hinge axis Y-direction optimization parameter.

According to the method, the arrangement of the air supporting rods is optimized through two aspects of manufacturability and operability, the optimal solution in the set optimization region is found through gradually judging and screening the set optimization region, the optimal design parameters in the set optimization region are obtained, compared with the traditional exhaustion and experience methods, the optimal scheme can be obtained more simply, conveniently and efficiently, and the method has great popularization value.

Drawings

FIG. 1: the flow diagram of the optimization method of the embodiment is shown.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The invention is described in further detail below with reference to the figures and the specific embodiments.

The embodiment describes a method for optimizing the design of an automobile back door pneumatic stay bar, that is, a method for optimizing the arrangement of the pneumatic stay bar, and refers to a strategy diagram shown in fig. 1, which is a specific workflow of the optimization method of the embodiment.

The first step is as follows: according to the CAS input of the vehicle model, the prearrangement of the backdoor hinge and the air stay bar is carried out in the CATIA (the CATIA is not limited in practical application, and the calculation function of the embodiment can be realized);

the second step is that: the environmental parameters are input in the CATIA, the environmental parameters of the embodiment comprise an environmental arrangement profile (the position of the air stay bar on the car body and the back door is optimized according to the profile, the relative position of the air stay bar and the environmental parts can be ensured to be reasonable), the requirements of a human-computer interface (a ground design reference line operated by a user and the slope of the ground where the car is located), the operational target requirement of the gas strut (the requirement of the user on the convenience for operating the backdoor, namely the condition corresponding to the objective solving function of the invention) and the backdoor weight are input in the CATIA, and after the operation is finished, grabbing a hinge position parameter, an air supporting rod mounting point position parameter, an opening and closing operation point position parameter (an operation position point of a user for opening and closing the back door by the opening and closing finger) and a gravity center position parameter (the gravity center is the gravity center of the back door assembly (including all parts)) under the set condition;

the third step: setting an optimal area of the gas strut, including setting an optimal range of a mounting point of the gas strut, an optimal requirement on a force value parameter of the gas strut and an optimal range of a hinge position point, wherein the setting is a selected range, by setting a large optimization area and performing optimization screening on the design parameters in the optimization area in the later period, the optimal design parameters are finally obtained, after the optimization area is set, the back door operability curves at different temperatures (different temperatures of the embodiment are high temperature, low temperature, normal temperature, medium and high temperature, etc., high temperature refers to a temperature exceeding 80 ℃, low temperature refers to a temperature minus 30 ℃ or minus 35 ℃, normal temperature refers to a temperature 20 ℃, and medium and high temperature refers to a temperature 60 ℃) can be output through the CATIA (the operability curves are output, so that a designer can conveniently check related design parameters of the operation convenience of a user at different temperatures and any back door opening/closing positions);

the fourth step: setting an automatic solving program in CATIA software, wherein the program comprises various objective functions, and screening the optimized area through the objective functions, and the specific solving process is as follows:

selecting a group of design parameters in the gas strut optimization area, substituting the selected design parameters into a set gas strut manufacturability target function, if the gas strut manufacturability target function is met, listing the group of design parameters into the manufacturability optimization area, otherwise, not entering the manufacturability optimization area, adjusting variables related to gas strut arrangement optimization, carrying out next judgment, until the judgment of all the design parameters in the gas strut optimization area is completed, obtaining the manufacturability optimization area, and actually, selecting a solution set which meets the gas strut manufacturability target function in the gas strut optimization area;

selecting a group of design parameters in the manufacturability optimization area, substituting the selected design parameters into a set low-temperature initial closing force objective function, if the low-temperature initial closing force objective function is met, listing the group of design parameters into the low-temperature closing optimization area, otherwise, not entering the low-temperature closing optimization area, adjusting a gas strut force value (reversely solving the gas strut force value through a low-temperature requirement, and then carrying out corresponding adjustment on the basis of the solved gas strut force value), carrying out next judgment until the judgment of all the design parameters in the manufacturability optimization area is completed, obtaining the low-temperature closing optimization area, and actually selecting a solution set which meets the low-temperature initial closing force objective function in the manufacturability optimization area;

screening the low-temperature closing optimization area based on the set normal-temperature closing force decreasing condition to obtain a decreasing optimization area; screening the degressive optimization area based on the set normal-temperature balance angle closing condition to obtain a balance angle optimization area; screening the balance angle optimization area based on the set normal-temperature initial closing force condition to obtain a normal-temperature closing optimization area; screening the normal-temperature closed optimization area based on the set normal-temperature initial opening force condition to obtain a normal-temperature optimization area;

the specific normal temperature solving process is as follows: selecting a group of design parameters in the low-temperature closing optimization area, substituting the selected design parameters into a set normal-temperature closing force degressive objective function, if the normal-temperature closing force degressive objective function is met, listing the group of design parameters into the degressive optimization area, otherwise, not entering the degressive optimization area, adjusting variables related to gas strut arrangement optimization and variables related to gas strut modeling optimization, carrying out next judgment until all the design parameters in the low-temperature closing optimization area are judged, obtaining the degressive optimization area, and actually selecting a solution set which meets the normal-temperature closing force degressive objective function in the low-temperature closing optimization area;

selecting a group of design parameters in the degressive optimization area, substituting the selected design parameters into a set normal-temperature closing balance angle objective function, if the normal-temperature closing balance angle objective function is met, listing the group of design parameters into the balance angle optimization area, otherwise, not entering the balance angle optimization area, adjusting variables related to gas strut arrangement optimization and variables related to gas strut modeling optimization, carrying out next judgment until the judgment of all the design parameters in the degressive optimization area is completed, obtaining a balance angle optimization area, and actually selecting a solution set which meets the normal-temperature closing balance angle objective function in the degressive optimization area;

selecting a group of design parameters in the balance angle optimization area, substituting the selected design parameters into a set normal-temperature initial closing force objective function, if the set design parameters meet the normal-temperature initial closing force objective function, listing the set design parameters into the normal-temperature closing optimization area, otherwise, not entering the normal-temperature closing optimization area, adjusting variables related to air strut arrangement optimization and variables related to air strut modeling optimization, performing next judgment until the judgment of all the design parameters in the balance angle optimization area is completed, obtaining the normal-temperature closing optimization area, and actually selecting a solution set which meets the normal-temperature initial closing force objective function in the balance angle optimization area;

selecting a group of design parameters in a normal-temperature closing optimization area, substituting the selected design parameters into a set normal-temperature initial opening force objective function, if the set design parameters meet the normal-temperature initial opening force objective function, listing the set design parameters into the normal-temperature optimization area, otherwise, not entering the normal-temperature optimization area, adjusting variables related to air strut arrangement optimization and variables related to air strut modeling optimization, performing next judgment until the judgment of all the design parameters in the normal-temperature closing optimization area is completed, obtaining the normal-temperature optimization area, and actually selecting a solution set which meets the normal-temperature initial opening force objective function in the normal-temperature closing optimization area;

in the normal-temperature optimization process, if the normal-temperature objective function is not met, the variables related to the optimization of the arrangement of the gas struts and the variables related to the optimization of the modeling of the gas struts are correspondingly adjusted,whereinVariables related to the arrangement optimization of the air stay bars comprise a back door position coordinate of the air stay bars installed on the back door and a vehicle body position coordinate of the air stay bars installed on the vehicle body; (ii) a The variables related to the optimization of the gas strut modeling comprise a hinge axis X-direction optimization parameter and a hinge axis Y-direction optimization parameter. (ii) a

After the normal-temperature optimization area is obtained, a set of solutions satisfying all the objective functions is obtained, and then the solution set is further optimized, wherein the optimization process comprises the following steps:

screening the normal-temperature optimized area based on the set force value range of the gas strut to obtain the optimized area of the force value of the gas strut; screening the optimal area of the force value of the gas strut based on the set self-closing potential energy range of the backdoor to obtain an optimal area of closing potential energy; screening the closed potential energy optimization area based on the set range of the back door operation force value to obtain a final optimization area, namely further optimizing and screening the normal temperature optimization area through the set range to finally obtain the final optimization area, wherein the final optimization area is a solution set meeting all the conditions;

selecting 10 groups of solutions in the final optimization region, and then selecting the optimal solution in the 10 groups of solutions;

the fifth step: and generating a backdoor opening degree, a backdoor gradient, a backdoor operating force value and an operating force curve based on the optimal solution, and obtaining position data of the gas strut and a corresponding opening and closing force value by the CATIA based on the optimal solution to complete the whole optimization method.

The maneuverability curve of the backdoor at low temperature, high temperature, normal temperature or other temperatures can be output through the CATIA, if the optimization process relates to the optimization of the hinge shaft, the optimization can bring about the change of the molding parting, so the position of the optimized hinge shaft must be output, and the requirement of changing the molding parting is convenient to put forward.

In the output result display interface, in order to better display and view the required result, the output interface is considered in all directions, the maneuverability curve, the force value of any point on the curve and the like can be quickly viewed, and the maneuverability parameters, the manipulation energy and the like at different temperatures can be viewed.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.