Simulation Analysis of Hinge Spring Based on Matlab and Adams_Hinge Knowledge

Article Rewritten:

"Abstract: This article aims to address the issues of long development cycles and insufficient accuracy in motion analysis of current automobile opening and closing parts. By using Matlab, the kinematics equation for the hinge of the glove box in a car model is established, and the motion curve of the spring in the hinge mechanism is solved. Additionally, a mechanical system software called Adams is used to establish a mechanism motion model and conduct simulation analysis on the dynamic characteristics of the operating force and displacement of the glove box during the design stage. The results show that the two analysis methods have good consistency, improving solution efficiency and providing a theoretical basis for optimal hinge mechanism design.

1

The rapid development of the automobile industry and computer technology has led to higher customer requirements for product customization. Beyond basic appearance and functions, automobile design now encompasses various research trends. In the European Auto Show, the six-link hinge mechanism is widely used in automobile opening and closing parts. This hinge mechanism not only provides a beautiful appearance and convenient sealing, but also enables movement by changing the length of each link, hinge point position, and spring coefficient. This allows for control of physical characteristics.

Mechanism kinematics primarily studies the relative motion between objects, specifically the relationship between displacement, velocity, and acceleration with time. Traditional mechanism kinematics and dynamics analysis can provide an analysis of complex mechanical motion, particularly the movement of automobile opening and closing. However, it may struggle to quickly calculate accurate results that meet engineering design requirements.

To address this, the hinge model of the glove box in a car model is studied. By simulating and calculating the manual opening and closing action of the glove box, the motion curve of the hinge spring is solved using Matlab. Furthermore, a geometric model is established in Adams using virtual prototype technology, and various kinematic parameters are set to conduct simulation analysis and verification. This improves solution efficiency and shortens the product development cycle.

2 Hinge Mechanism of the Glove Box

The glove box inside a car cabin typically utilizes a hinge-type opening mechanism, composed of two springs and multiple connecting rods. The position of the cover at any opening angle is unique. The design requirements of the hinge linkage mechanism include ensuring the initial position of the box cover and panel match the design requirements, enabling a convenient opening angle for occupants to take and place items without interfering with other structures, and ensuring easy opening and closing operation with a reliable lock when the cover is at its maximum opening angle.

The maximum opening of the glove box is mainly determined by the stroke of the spring. By calculating the displacement and force changes of the two hinge springs during the stretching and compression process, the motion law of the hinge mechanism can be obtained.

3 Matlab Numerical Calculation

3.1 Hinged Four-bar Linkage Mechanism

The hinge linkage mechanism is simple in structure, easy to manufacture, can carry a large load, and is convenient to realize known motion laws and reproduce known motion trajectories, making it widely used in engineering design. By changing the shape and size of components, taking different components as frames, reversing the kinematic pair, and enlarging the rotating pair, the hinge four-bar linkage mechanism can evolve into various linkage mechanisms.

The position equation for the closed vector polygon ABFO in the Cartesian coordinate system is established. By converting the equation from vector form to complex form using Euler's formula, the real and imaginary parts are separated.

2.1 Motion Analysis of Hinge Spring L1

The mechanism is decomposed into two four-bar linkages to solve the motion law of the hinge spring L1 using an analytical method. The length change of spring L1 is calculated as the displacement change of HI in the triangle FIH.

Running the Matlab program provides the movement curve of the hinge spring L1 during the closing process of the lid.

2.2 Motion Analysis of Hinge Spring L2

Similar to the analysis for hinge spring L1, the mechanism is decomposed into two four-bar linkages to solve the motion law of hinge spring L2. The length change of spring L2 is calculated as the displacement change of EG in the triangle EFG.

Running the Matlab program provides the motion curve of hinge spring L2 when the lid is closing.

4

This study establishes the kinematic equations of the hinge spring mechanism and performs modeling and simulation to analyze the motion laws of the hinge springs. The feasibility and consistency of the Matlab analytical method and Adams simulation method are verified.

The Matlab analytical method handles diverse data, while Adams modeling and simulation are more convenient, improving solution efficiency. The comparison between the two methods shows little difference in results, indicating good consistency.

In conclusion, this study provides insights into improving the development cycle and solution efficiency of automobile opening and closing parts, as well as a theoretical basis for optimal hinge mechanism design."

References:

[1] Zhu Jianwen, Zhou Bo, Meng Zhengda. Kinematics Analysis and Simulation of 150 kg Robot Based on Adams. Industrial Control Computer, 2017 (7): 82-84.

[2] Shan Changzhou, Wang Huowen, Chen Chao. Vibration modal analysis of a heavy truck cab mount based on ADAMS. Automotive Practical Technology, 2017 (12): 233-236.

[3]Hamza K. Multi-objective design of vehicle suspension systems via a local diffusion genetic algorithm for disjoint Pareto frontiers. Engineering Optimization, 2015, 47