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Method and system for calculating rigidity and strength of automobile variable cross-section plate spring
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A technology of strength calculation and variable section, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as error-prone, complicated calculation process, and long calculation cycle
Pending Publication Date: 2021-10-08
JIANGLING MOTORS
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[0004] In view of the above problems, an object of the present invention is to propose a method for calculating the stiffness and strength of a variable-section leaf spring for automobiles, so as to solve the problems of complex calculation process, long calculation period and error-prone in the prior art
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example 1
[0074] see figure 2 and image 3 , taking the calculation of the stiffness and strength of a single leaf spring as an example, figure 2 is a three-dimensional model diagram of a single leaf spring, image 3 is a two-dimensional schematic diagram of one half of a single leaf spring ( figure 2 The cross-sectional dimension parameters of the part shown in the box).
[0075] Step 1, such as image 3 As shown, take the leaf spring coil ear end as the coordinate origin, record the x-coordinate xi=[0,50,100,150,584,624] at the change of the leaf spring section, and the section height is yi=[12,12,8,8,12,15] respectively, Use any programmingsoftware, such as the linear interpolation function interp1d(xi, yi) in python or matlab, to fit the function hx=interp1d(xi, yi) of the section height of each coordinate in the length direction of the leaf spring. After fitting, you can use hx (x) Solve to obtain any x (0≤x≤624), that is, the height value of the leaf spring section at any...
example 2
[0100] by Figure 4 Take the three-leaf spring shown as an example, solve the stiffnesses s1, s2, and s3 of the three reeds respectively, then solve the bending moment M(x) of each section of each leaf spring, and finally calculate the stress σ( x).
[0122] Solution of the stiffness of the second leaf spring
[0123] ...
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Abstract
The invention discloses a method and system for calculating rigidity and strength of an automobile variable cross-section plate spring. The method comprises the steps of: defining parameters of a half side of the plate spring as variables, the length of one half of the plate spring as L, the width of the plate spring as b, the maximum load borne by the plate spring as F, the elastic modulus as E, the coordinate of a cross-section change position of the plate spring as xi, and the cross-section height of the cross-section change position as yi, according to the values of xi and yi, fitting the height hx (x) of each section of the plate spring in the whole length direction based on a linear interpolation function; dividing the plate spring into n parts along the length direction, solving series X of x coordinates at each equally-divided section, an inertia moment I (x) of each section, an anti-bending section coefficient W (x) and a bending moment M (x) borne by each section, analyzing the stress behavior of the half side of the plate spring in the form of a cantilever beam, solving a tail end displacement value of each leaf spring by using an integral method, and solving the rigidity value of the single side of the plate spring and the total rigidity of the plate spring; and calculating the strength of the plate spring. With the method adopted, the problems of complex calculation process, long period and error proneness in the prior art can be solved.
Description
technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and system for calculating stiffness and strength of variable-section leaf springs of automobiles. Background technique [0002] With the rapid development of the automobile industry and the continuous improvement of people's living conditions, automobiles have become one of the indispensable means of transportation for people's production and life. Leaf springs in automobiles (referred to as leaf springs) are low in cost and easy to maintain, and are widely used in passenger cars, trucks, and pickups. The variable cross-section leaf spring can realize the equal strength design of the material, so that the performance of the material can be fully exerted, realize the lightweight, reduce the cost and improve the comfort of the car. Therefore, the variable cross-section leaf spring is widely used in the new generation of automobile products. [0003] In order to reduc...
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