Method for calculating the composite stiffness of a main and auxiliary spring type composite material plate spring

A composite material plate and composite stiffness technology, which is applied in the field of leaf springs and can solve problems such as complex calculation of composite stiffness.

Inactive Publication Date: 2019-06-04
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

However, due to the anisotropy of the composite material, the composite leaf spring also has variable cross-section geometric characteristics, and the contact boundary after the main and auxiliary springs work together has nonlinear factors, which lead to the composite stiffness of the main and auxiliary spring composite leaf springs Calculations become very tricky and complex

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  • Method for calculating the composite stiffness of a main and auxiliary spring type composite material plate spring
  • Method for calculating the composite stiffness of a main and auxiliary spring type composite material plate spring
  • Method for calculating the composite stiffness of a main and auxiliary spring type composite material plate spring

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Embodiment

[0184] Such as figure 2 Schematic diagram of the structure and related geometric dimensions of the second half of the main and auxiliary spring composite leaf springs. In this example, the specific values ​​of each parameter are:

[0185] Main spring: L r =715mm, leaf spring width b=70mm, H=31mm, l r =687mm, l 3 =50mm, l 2 =58mm, l 1 =92mm, h=17mm, the change law of the thickness of the parabola segment BC:

[0186]

[0187] Secondary spring: H'=31mm, l 5 =20mm, total length of auxiliary spring l 4 =100mm, h′=13.5mm, the change rule of GH thickness of parabola segment:

[0188]

[0189] The structure and related geometric dimensions of the first half of the main and auxiliary spring composite leaf springs are basically the same as those of the second half. The different parameters include: the length of the first half of the main spring is 700mm, and the length of the first half of the auxiliary spring is 560mm.

[0190] According to the calculation formula...

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Abstract

The invention relates to a method for calculating the composite stiffness of a main and auxiliary spring type composite material plate spring. The calculation method comprises the following steps: firstly, calculating the bending stiffness of each cross section of a composite main spring and an auxiliary spring according to the mechanics of the composite, and deducing a calculation formula for thebending stiffness of each cross section of the composite main spring and the auxiliary spring through a formula; and then, based on the finite difference theory, a step of calculating the composite stiffness of the main and auxiliary springs of the composite material after the main and auxiliary springs work together is given, and deriving a calculation formula of the composite stiffness of the main and auxiliary spring type composite material plate spring. The calculation method provided by the invention not only provides a theoretical basis for the calculation of the composite stiffness ofthe main and auxiliary spring type composite material plate springs, but also is high in calculation precision and applicable to the calculation of the composite stiffness of the main and auxiliary spring type composite material plate springs with any section shapes. Besides, the calculation method is also suitable for programming calculation, the calculation speed is far higher than that of traditional calculation methods such as finite element analysis, the research and development period of the composite material plate spring can be remarkably shortened, and the research and development cost is reduced.

Description

【Technical field】 [0001] The invention relates to a method for calculating composite rigidity of a primary and secondary spring type composite leaf spring, which is applied to automobile suspension and belongs to the technical field of leaf springs. 【Background technique】 [0002] Leaf spring is an elastic element widely used in automobile suspension, and its weight accounts for 10%-20% of the unsprung mass of the automobile. A composite leaf spring is a leaf spring that uses fiber-reinforced resin-based composite materials. Under the premise of the same function, replacing the leaf spring with a composite material leaf spring can reduce the weight by more than 50%. In addition, composite leaf springs also have significant advantages such as high specific modulus, high specific strength, good fatigue performance, strong designability, corrosion resistance, easy processing, and high safety redundancy. Therefore, the overall performance of the composite leaf spring is signif...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 柯俊吴震宇徐婷张不扬
Owner ZHEJIANG SCI-TECH UNIV
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