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A Frequency Domain Fatigue Analysis Method for Vehicle Suspension Leaf Springs

A technology for leaf spring and fatigue analysis, applied in the direction of instrument, design optimization/simulation, calculation, etc., can solve the problems of long development cycle and high test cost, and achieve the effect of high result accuracy, shortened design cycle, and small amount of calculation.

Active Publication Date: 2018-10-02
HEFEI UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

The whole development cycle is long and the experiment is expensive

Method used

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  • A Frequency Domain Fatigue Analysis Method for Vehicle Suspension Leaf Springs
  • A Frequency Domain Fatigue Analysis Method for Vehicle Suspension Leaf Springs

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Embodiment Construction

[0031] In the frequency domain fatigue analysis method of vehicle suspension leaf springs in this embodiment, the leaf springs are used in automobile suspensions, and several reeds with different curvatures are clamped by bolts and leaf spring seats to form elastic elements, such as figure 1 and figure 2 As shown, there are three reeds 1 in this embodiment, and a bolt hole 2 is arranged at the center of each reed; the leaf spring has three states, which are respectively free state, assembled state and working state; figure 1 Each reed 1 is in a free state in the leaf spring of the shown free state; figure 2 The assembly state shown refers to the clamping of the bolt 3 and the leaf spring seat 4 on the basis of the free state, such as figure 2 As shown, each reed is assembled into an integral component with the same curvature, and prestress is formed on the reed; the leaf spring under working condition, its leaf spring seat 4 is fixedly connected with the rear axle of the v...

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Abstract

The present invention discloses a vehicle suspension leaf spring frequency domain fatigue analysis method. The method is characterized by comprising: targeted at a pre-stress and a large transformation effect of a leaf spring, establishing a leaf spring geometric model in a free state and importing the leaf spring geometric model into finite element software for analysis; by applying a displacement constraint on a plate spring seat and applying a theoretical axle load on front and rear lugs, obtaining stress distribution in an operating state of the leaf spring, so as to obtain a leaf spring modality result file; by acquiring experimental data of a vehicle on a durability test road, obtaining a power spectrum density of a relative acceleration; and targeted at the obtained leaf spring modality result file, by using the obtained power spectrum density as a load input, executing a random vibration analysis in the finite element software, extracting a dynamic response result of a virtual prototype under a random excitation and estimating fatigue performance of the leaf spring on the durability test road according to a Gaussian three interval method. The method disclosed by the present invention is accurate in result and high in operation efficiency.

Description

technical field [0001] The invention relates to a leaf spring fatigue analysis method, more specifically, a vehicle suspension leaf spring frequency domain fatigue analysis method applied to the evaluation of automobile suspension reliability. Background technique [0002] Reliability is one of the important indicators to measure the quality level of automobiles. Leaf springs are key auto parts that connect the axle to the body, and are used to buffer road excitation and improve ride comfort. In view of the fact that the leaf spring bears the impact load from the random road surface during the driving process of the car, the force condition is relatively complicated, and its failure mode is mainly fatigue failure. Therefore, the calculation of the fatigue life is called one of the main research contents in the design and manufacture of the leaf spring. one. Most of the existing leaf spring designs use static strength check or sine load to check fatigue strength, and then c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 卢剑伟韩为铎栾振赵方洲王翔宇吴勃夫谷先广姜平姜武华刘俊
Owner HEFEI UNIV OF TECH
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