Anti-shaking design method for passenger car outside rear-view mirror based on door closing impact load

A technology for exterior rearview mirrors and impact loads, applied in design optimization/simulation, special data processing applications, geometric CAD, etc., can solve problems affecting users' overall evaluation of a good brand image, affecting user sensory experience, external rearview mirror vibration, etc. problems, to achieve the effect of improving user sensory experience and brand quality evaluation, improving user sensory experience, and solving door closing vibration

Active Publication Date: 2020-11-17

CHINA FIRST AUTOMOBILE

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AI-Extracted Technical Summary

Problems solved by technology

[0002] In the development and trial production stage of passenger cars, it is often found that the exterior rearview mirror shakes obviously when the front door is closed. This problem affects the user's sensory experience and greatly affects the user's overall evaluation of the vehicle and t...

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Method used

Step 2, car door, vehicle body, rearview mirror, sealing strip, door lock and hinge model are built together by actual installation situation, set up car door closing transient simulation model, take the momentary speed when car door is closed as transient simulation Calculate the boundary conditions and evaluate the vibration of the exterior rearview mirror. Using optimization methods such as topology optimization, material thickness optimization, and empirical schemes, the structure of the door and exterior mirrors i...

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Abstract

The invention belongs to the technical field of automobiles, and particularly relates to an anti-shaking design method for a passenger car outside rear-view mirror based on door closing impact load. The method comprises the following steps: step 1, modeling a vehicle door, a vehicle body and a rearview mirror, modeling a vehicle door sealing strip, modeling a vehicle door lock and modeling a vehicle door hinge; and step 2, designing impact jitter resistance of the outside rearview mirror according to the step 1. Structures of the vehicle door and the outside rear-view mirror are reasonably designed in the early development stage of the vehicle door and the rear-view mirror, the outside rear-view mirror can be prevented from shaking when the vehicle door is closed in the later stage, the development period is shortened, the research and development cost is reduced, the user sensory experience is improved, and the problem of outside rear-view mirror door closing shaking is solved.

Application Domain

Geometric CADDesign optimisation/simulation +1

Technology Topic

Rear-view mirrorCar door +2

Image

Examples

Experimental program(1)

Example Embodiment

[0023] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for ease of description, the drawings only show a part of the structure related to the present invention instead of all of the structure.

[0024] See figure 1 , An anti-shake design method for passenger car exterior rearview mirrors based on door-closing impact load, characterized in that the method includes:

[0025] Step 1: Modeling of door, body and rearview mirror, modeling of door seal, modeling of door lock, modeling of door hinge;

[0026] The specific method for modeling the door, body and rearview mirror is as follows:

[0027] Establish a finite element simulation model of the car door, door frame part of the car body and the rearview mirror, divide each part into finite element mesh data according to the three-dimensional data, and carry out detailed modeling of the door welding point, glue, and weld; then the rearview mirror It is installed on the door according to the design position. The door is installed on the intercepted door frame and the part of the body model that has a greater impact on the door closing force. Open a certain angle so that the door lock hook is in the position where it is about to contact the body side lock ring.

[0028] The specific method of modeling the door sealing strip is as follows:

[0029] The door sealing strip is a rubber element, which has a high degree of non-linearity. The force and compression deformation characteristics of the door sealing strip play a decisive role in the closing force of the door. The force-deformation characteristic of the sealing strip can be regarded as a nonlinear spring system, and the change of its spring stiffness depends on the deformation of the sealing strip. Therefore, the low-density foam unit, LOW_DENSITY_FOAM, is used for modeling, and the material positive definite constants and other parameters are assigned according to the cross-sectional shape of the sealing strip, and their values are obtained by calibration with the test curve.

[0030] The specific method of modeling the door lock is as follows:

[0031] Through the test, the force and displacement curves of the lock overcoming the lock are measured to debug the spring stiffness and damping characteristics of the lock model of the door, as well as the calculation input of the transient process of door closing. The lock body is modeled by solid elements, and its surface is covered with a shell element to simulate the contact force between the lock buckle and the lock wheel. During the calculation process, it is ensured that the lock hook and the lock ring can reach the locked state, and the pawl, namely the pawl, can be Keep the lock hook in the locked state, and adjust the accuracy of the lock model by comparing with the contact force on the lock obtained by testing.

[0032] The specific method of modeling the door hinge described in step one is as follows:

[0033] The energy loss of the hinge to the closing energy is mainly due to the friction between the fixed part and the movable part of the hinge during the movement of the door switch. In addition, the inclination of the hinge axis will reduce the closing energy, which needs to be considered in the analysis. The hinge building simulation uses the hinge element in the ABAQUS software, and uses Moony damping to simulate the friction characteristics of the hinge.

[0034] Step 2: Build the door, body, rearview mirror, sealing strip, door lock and hinge model together according to the actual installation situation, establish the door closing transient simulation model, and use the instantaneous speed when the door is closed as the boundary condition of the transient simulation calculation , Evaluate the amount of outside mirror jitter. Using optimization methods such as topology optimization, material thickness optimization, and empirical solutions, the structure of the door and exterior mirrors is optimized to reduce the amount of exterior mirror jitter to meet the requirements.

[0035] The invention rationalizes the design of the door and exterior mirror structure in the early stage of the development of the door and the rearview mirror, which can avoid the vibration of the exterior rearview mirror when the door is closed in the later stage, shorten the development cycle, reduce the development cost, improve the user's sensory experience, and solve the external The rearview mirror jitters when the door is closed.

[0036] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. And variations, the scope of the present invention is defined by the appended claims and their equivalents.

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Description & Claims & Application Information

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RFID (Radio Frequency Identification Device) technique-based rail transit ground beacon positioning device and train positioning method

InactiveCN107139973AShorten the development cycleImprove versatilityRailway signalling and safetyEngineeringRadio-frequency identification

Owner:JINAN UNIVERSITY

Classification and recommendation of technical efficacy words

Reduce R&D costs
Shorten the development cycle

Anti-shaking design method for passenger car outside rear-view mirror based on door closing impact load

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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