Reliability Analysis And Robust Design Of Vehicle Seat Belt Guiding Ring System

As the indispensable vehicle in today's world,automobile safety has always been the focus of attention.One of these focuses is the reliability of seat belts.Therefore,in order to design the safety belt better,the collision test came into being.When a car suddenly collides,the ribbon concentration phenomenon appears at the upper guide ring(D ring)of the seat belt height regulator,which makes the positive local pressure on the passenger's chest suddenly increase and causes serious injury to the human chest.This is because the seat belt is pulled by the chest during the car collision and the seat belt produces transverse force.Because of the directional displacement and the force acting on the steering ring ring ring ring ring ring ring ring ring,the reliability study of the transverse displacement parameters is of great significance to the steering ring ring ring ring ring ring ring ring ring ring.The content of this article are:(1)Based on the knowledge of static mechanics,a static analytical model for analyzing the lateral displacement of the webbing is established,and the uncertain factors affecting the reliability of the guiding loop system are analyzed.(2)The structure of the guide ring is simplified,and the overall analysis model with the guide ring system as the research object is determined.The parameterized model of the system is established by ANSYS Workbench software,and the lateral displacement of the webbing is studied through dynamic analysis.At the same time,the pre-tightening force is changed to further study whether the pre-tightening force has an influence on the lateral displacement of the webbing.(3)Using the optimization design module(Design Exploration)in ANSYS Workbench to perform the experimental design.According to the test results,the random variables that affecting the lateral displacement of the webbing can are screened.Based on the experimental design database,the BP neural network is used to calculate the lateral displacement of the webbing and the variables.The relationship is fitted to construct the reliability function function of the lateral displacement and load force of the webbing.Considering the influence of the load force on the webbing displacement,the dynamic reliability of the guide loop system is determined by the second-order moment method and Monte-Carlo simulation method.Its sensitivity is studied.(4)Based on the relevant theory of reliability robust design,the objective function of reliability optimization is established.By setting the value range of the structural parameters of the guiding ring system,under the optimization target and constraints,the random variables affecting the lateral displacement of the webbing are optimized,the reliability of the optimized webbing displacement is reduced,and the quality of the guiding loop system is reduced.The reliability is improved and the purpose of reliable and robust design is achieved.