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Calculation method for nonlinearity throttling loss of oil fluid in hydraulic buffer

A hydraulic shock absorber and throttling loss technology, which is applied in the field of hydraulic shock absorbers, can solve problems such as difficult shock absorber design and characteristic simulation models, high design and test costs, and long development cycles.

Inactive Publication Date: 2013-05-22
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the calculation of the nonlinear throttling loss of the shock absorber oil, at present, most of the domestic and foreign circulation finite element simulation software are used to carry out numerical simulation through modeling, and the oil flow state and Approximate characteristic values, but because the moving speed of the shock absorber changes, this method cannot meet the requirements of the modern CAD design and characteristic simulation of the shock absorber
The throttling loss of the shock absorber at different speeds is nonlinear, and in the actual shock absorber design, most of the oil throttling losses are taken as a linear constant, so it is difficult to establish accurate shock absorber design and characteristic simulation The model can only be used for approximate design and calculation, and it is difficult to obtain reliable throttle valve parameter design values ​​and characteristic simulation values, which cannot meet the requirements of automotive shock absorber design and characteristic simulation
Due to the constraints of the analytical calculation of the deformation of the throttle valve plate and the analytical calculation theory of the nonlinear throttling loss of the oil, there is no reliable design method for the parameter design of the throttle valve of the shock absorber in foreign countries at present. The hole area, and then through the "repeated test + modification" method, finally get the design value of the shock absorber's normal hole area. Therefore, the design and test costs are high, the development cycle is long, and it is difficult to meet the requirements of the rapid development of the automotive industry.

Method used

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  • Calculation method for nonlinearity throttling loss of oil fluid in hydraulic buffer
  • Calculation method for nonlinearity throttling loss of oil fluid in hydraulic buffer
  • Calculation method for nonlinearity throttling loss of oil fluid in hydraulic buffer

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: The piston assembly and recovery valve structure of a hydraulic shock absorber is as follows figure 2 As shown, the piston body 1, the piston rod 2, the piston hole 3, the recovery valve plate 4, the limit retaining ring 5, the fastening nut 6, and the normally open orifice 7, wherein, the angle for the piston hole 3 is . The inner diameter of the piston cylinder of the shock absorber , piston rod diameter d g =20mm, piston hole diameter , the number of piston holes , oil kinematic viscosity = m 2 / s, the critical Reynolds number of oil laminar flow and turbulent flow Rec=2300.

[0027] The design method of the normal through hole of the hydraulic shock absorber recovery valve provided by the example of the present invention, its design process is as follows figure 1 As shown, the specific steps are as follows:

[0028] (1) Determine the critical speed of the shock absorber:

[0029] according to figure 2 Structural parameters of the pisto...

Embodiment 2

[0039] Embodiment 2: The inner diameter of the piston cylinder of a certain hydraulic shock absorber , piston rod diameter d g =18mm, piston hole diameter , the number of piston holes , oil kinematic viscosity = m 2 / s, the critical Reynolds number of oil laminar flow and turbulent flow Rec=2300.

[0040] Using the design steps of Embodiment 1, according to the structural parameters and oil parameters of the shock absorber piston body, the critical speed of the shock absorber And the piston hole throttling loss coefficient at different speeds Calculations are performed where the critical speed of the shock absorber =0.6m / s, moving speed of shock absorber V Throttle loss coefficient along the piston hole when =0.3m / s = 0.0557; at V = 0.7326m / s when the piston hole throttle loss coefficient =0.0265; when continuously changing in the range of 0-1.0m / s, the throttling loss coefficient of the piston hole of the shock absorber Variations with speed, such as ...

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Abstract

The invention relates to a calculation method for nonlinearity throttling loss of oil fluid in a hydraulic buffer and belongs to the technical field of hydraulic buffers. No reliable calculation method for nonlinearity throttling loss of oil fluid in an existing hydraulic buffer exists. The nonlinearity throttling loss of the oil fluid in most of the existing hydraulic buffer is usually calculated based on a linear constant, so that the requirements of parameter design and speciality simulation of a throttling valve of the buffer can not be met. The calculation method for the nonlinearity throttling loss of the oil fluid in the hydraulic buffer comprises the following steps, firstly, ascertaining a critical speed Vc of the buffer according to a structure parameter, the diameter and the number of the piston holes, an oil fluid parameter and the critical Renault coefficient; and then, establishing the calculation method for the piecewise function of the nonlinearity throttling loss coefficient of the oil fluid in the piston hole of the hydraulic buffer according to the critical speed Vc. By means of the calculation method for the nonlinearity throttling loss of the oil fluid in the hydraulic buffer, the nonlinearity throttling loss coefficient of the buffer at any speed can be calculated accurately, so that a reliable calculation method of the nonlinearity throttling loss coefficient of the oil fluid is provided for the establishment of the accurate parameter design of the hydraulic buffer throttling valve and a speciality simulation mathematical model.

Description

technical field [0001] The invention relates to a hydraulic shock absorber, in particular to a calculation method for the non-linear throttling loss of oil in the hydraulic shock absorber. Background technique [0002] Compared with other types, hydraulic shock absorbers have simple structure and stable performance, and are currently the most widely used shock absorbers. The damping characteristics of the hydraulic shock absorber have an important influence on the performance of the suspension system and the ride comfort of the vehicle. It is not only related to the structural parameters of the shock absorber and throttle valve, but also to the characteristic parameters of the oil and the along-course and local throttling. loss related. For the calculation of the nonlinear throttling loss of the shock absorber oil, at present, most of the domestic and foreign circulation finite element simulation software are used to carry out numerical simulation through modeling, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 周长城宋群曹海琳
Owner SHANDONG UNIV OF TECH