CN103116710A - Calculation method for nonlinearity throttling loss of oil fluid in hydraulic buffer - Google Patents

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

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Publication number
CN103116710A
CN103116710A CN2013100738482A CN201310073848A CN103116710A CN 103116710 A CN103116710 A CN 103116710A CN 2013100738482 A CN2013100738482 A CN 2013100738482A CN 201310073848 A CN201310073848 A CN 201310073848A CN 103116710 A CN103116710 A CN 103116710A
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vibration damper
fluid
nonlinearity
hydraulic buffer
speed
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周长城
宋群
曹海琳
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Shandong University of Technology
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Shandong University of Technology
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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

The computing method of the non-linear restriction loss of hydraulic buffer fluid
Technical field
The present invention relates to hydraulic buffer, particularly the computing method of the non-linear restriction loss of hydraulic buffer fluid.
Background technology
Hydraulic buffer is compared with other type, and simple in structure, stable performance is the vibration damper that is most widely used at present.The damping characteristic of hydraulic buffer has material impact to suspension system performance and Vehicle Driving Cycle ride comfort, and it is not only relevant with the structural parameters of vibration damper and throttling valve, but also with fluid characterisitic parameter and relevant with local restriction loss along journey.Non-linear restriction loss is calculated for vibration damper fluid, at present, mostly to utilize the circulation finite element emulation software both at home and abroad, carry out numerical simulation by modeling, can access fluid flow state and approximate characteristic value under given vibration damper movement velocity, but because the vibration damper movement velocity changes, therefore, the method can not satisfy the requirement of vibration damper modernization CAD design and characteristic Simulation.The restriction loss of vibration damper under friction speed is nonlinear, and in actual absorber designing, mostly that a linear constant is got in restriction loss to fluid, therefore be difficult to set up accurate absorber designing and characteristic Simulation model, can only carry out Approximate Design and calculating, be difficult to obtain reliable throttling valve parameter designing value and characteristic Simulation value, can not satisfy the requirement of vehicle shock absorber design and characteristic Simulation.Due to the restriction that is subjected to the calculating of throttle valve plate Deformation analyses and the non-linear restriction loss analytical Calculation of fluid theory, vibration damper throttling valve parameter designing also do not had reliable method for designing abroad at present, mostly to determine at first by rule of thumb a normal open hole area, then pass through the method for " repetition test+modification ", finally obtain vibration damper normal open hole area design load, therefore, design and testing expenses are high, construction cycle is long, is difficult to satisfy the requirement of automobile industry fast development.At present, China is obtaining breakthrough aspect hydraulic buffer design and characteristic Simulation research, for example, Shandong Technology Univ has solved the throttle valve plate Deformation analyses computational problem of restriction absorber designing, and certain research has been carried out in non-linear restriction loss to fluid, has established reliable theoretical foundation for realizing hydraulic buffer throttling valve parameters C AD design.Along with the fast development of auto industry and improving constantly of automobile driving speed, vibration damper performance and design are had higher requirement.The non-linear restriction loss of the fluid of hydraulic buffer under friction speed is calculated, throttling valve parameter designing and characteristic Simulation modeling all had material impact, therefore, hydraulic buffer throttling valve parameter accurately designs and the requirement of the reliable emulation of characteristic in order to satisfy, and must set up a kind of computing method of accurate, the reliable non-linear restriction loss of hydraulic buffer fluid.
Summary of the invention
For the defective that exists in above-mentioned prior art, technical matters to be solved by this invention is to provide a kind of computing method of accurate, the reliable non-linear restriction loss of hydraulic buffer fluid, and its calculation flow chart as shown in Figure 1.
The computing method of the non-linear restriction loss of hydraulic buffer fluid provided by the present invention is characterized in that adopting following steps:
(1) determine vibration damper critical velocity point:
According to the damper piston internal diameter of cylinder
Figure 227566DEST_PATH_IMAGE002
, diameter of piston rod
Figure 2013100738482100002DEST_PATH_IMAGE003
, the piston hole diameter
Figure 426597DEST_PATH_IMAGE004
And number
Figure 2013100738482100002DEST_PATH_IMAGE005
, fluid kinematic viscosity
Figure 422979DEST_PATH_IMAGE006
And the critical Reynolds number Rec=2300 of fluid laminar flow and turbulent flow, determine the vibration damper critical velocity
Figure 755871DEST_PATH_IMAGE001
:
Figure 2013100738482100002DEST_PATH_IMAGE007
;
(2) be less than or equal to critical velocity
Figure 914451DEST_PATH_IMAGE008
Along journey restriction loss coefficient calculations:
According in step (1)
Figure 268072DEST_PATH_IMAGE001
, when vibration damper speed V≤ V cThe time, fluid is laminar flow flowing of piston hole, along the stroke pressure loss coefficient is:
Figure 2013100738482100002DEST_PATH_IMAGE009
；
(3) greater than critical velocity along journey restriction loss coefficient calculations:
According in step (1)
Figure 576748DEST_PATH_IMAGE001
, when vibration damper speed V V cThe time, fluid is turbulent flow flowing of piston hole, along the stroke pressure loss coefficient is:
Figure 776786DEST_PATH_IMAGE010
；
(4) vibration damper arbitrary speed VUnder non-linearly calculate along the journey restriction loss:
According in step (1)
Figure 176674DEST_PATH_IMAGE001
, when vibration damper in arbitrary speed VThe time, according to vibration damper speed VWith critical velocity
Figure 462162DEST_PATH_IMAGE001
Size, according to step (2) or step (3), the non-linear of piston hole calculated along journey restriction loss coefficient respectively, that is:
。
The present invention has advantages of than prior art:
The computing method of the non-linear restriction loss of hydraulic buffer fluid according to hydraulic buffer structural parameters, piston hole diameter and number and fluid parameter, at first utilize the critical Reynolds number of fluid to determine the vibration damper critical velocity V c, according to critical velocity V cSet up the non-linear restriction loss coefficient of hydraulic buffer piston hole fluid piecewise function Analytic Calculation Method, thereby realize in the analytical Calculation to the non-linear restriction loss of damper piston hole fluid in the friction speed situation, for setting up accurate hydraulic buffer throttling valve parameter designing mathematical model and characteristic Simulation mathematical model, provide important fluid non-linear restriction loss computing method.
Be further described below in conjunction with accompanying drawing in order to understand better the present invention.
Fig. 1 is the non-linear restriction loss calculation flow chart of hydraulic buffer fluid;
Fig. 2 is the structural drawing of hydraulic buffer piston body;
Fig. 3 is the hydraulic buffer piston hole restriction loss coefficient of embodiment one
Figure DEST_PATH_721505DEST_PATH_IMAGE024
With speed change curves;
Fig. 4 is the hydraulic buffer piston hole restriction loss coefficient of embodiment two
Figure DEST_PATH_116715DEST_PATH_IMAGE024
With speed change curves.
Specific embodiments
Below by embodiment, the present invention is described in further detail.
Embodiment one: certain hydraulic buffer piston assembly and rebuilt valve structure as shown in Figure 2, piston body 1, piston rod 2, piston hole 3 restores valve block 4, spacing back-up ring 5, clamp nut 6, throttle hole 7 wherein, for the angle of piston hole 3 is
Figure 90086DEST_PATH_IMAGE014
The piston bore internal diameter of this vibration damper , diameter of piston rod d g=20mm, the piston hole diameter
Figure 236772DEST_PATH_IMAGE016
, the piston hole number
Figure 2013100738482100002DEST_PATH_IMAGE017
, fluid kinematic viscosity
Figure 449578DEST_PATH_IMAGE006
=
Figure 93049DEST_PATH_IMAGE018
m 2/ s, the critical Reynolds number Rec=2300 of fluid laminar flow and turbulent flow.
Example of the present invention provides hydraulic buffer rebuilt valve normal open hole method for designing, its design cycle as shown in Figure 1, concrete steps are as follows:
(1) determine the vibration damper critical velocity:
Structural parameters according to Fig. 2 damper piston body: piston bore internal diameter
Figure 625979DEST_PATH_IMAGE015
, diameter of piston rod d g=20mm, the piston hole diameter
Figure 704793DEST_PATH_IMAGE016
And number
Figure 609295DEST_PATH_IMAGE017
, fluid kinematic viscosity
Figure 912101DEST_PATH_IMAGE006
=
Figure 767799DEST_PATH_IMAGE018
m 2/ s and critical Reynolds number Rec=2300 determine the vibration damper critical velocity
Figure 181463DEST_PATH_IMAGE001
For:
Figure 940471DEST_PATH_IMAGE007
＝0.4792m/s；
(2) be less than or equal to critical velocity along journey restriction loss coefficient calculations:
According in step (1) =0.4792m/s is when the vibration damper movement velocity VDuring=0.3m/s, due to V
Figure 2013100738482100002DEST_PATH_IMAGE019
, therefore, according to hydraulic buffer piston bore internal diameter
Figure 616937DEST_PATH_IMAGE015
, diameter of piston rod , the piston hole diameter
Figure 639175DEST_PATH_IMAGE016
And number , fluid kinematic viscosity
Figure 319872DEST_PATH_IMAGE006
= m 2/ s calculates the vibration damper movement velocity VPiston hole in=0.3m/s situation is along journey restriction loss coefficient
Figure 603403DEST_PATH_IMAGE012
Value is:
Figure 15930DEST_PATH_IMAGE009
＝0.0444；
(3) greater than critical velocity along journey restriction loss coefficient calculations:
According in step (1)
Figure 163194DEST_PATH_IMAGE001
=0.4792m/s is when the vibration damper movement velocity VDuring=0.7326m/s, due to V
Figure 738487DEST_PATH_IMAGE020
=0.4792m/s, therefore, according to hydraulic buffer piston bore internal diameter , diameter of piston rod
Figure 2013100738482100002DEST_PATH_IMAGE021
, the piston hole diameter
Figure 142104DEST_PATH_IMAGE016
And number
Figure 850297DEST_PATH_IMAGE017
, fluid kinematic viscosity
Figure 742029DEST_PATH_IMAGE006
=
Figure 129148DEST_PATH_IMAGE018
m 2/ s calculates the vibration damper movement velocity VPiston hole restriction loss coefficient in=0.7326m/s situation
Figure 905474DEST_PATH_IMAGE012
Value is:
Figure 327228DEST_PATH_IMAGE010
＝0.0278；
(4) vibration damper arbitrary speed VUnder restriction loss calculate:
When the vibration damper movement velocity VIn the time of in 0～1.0m/s interval, according to vibration damper speed VWith critical velocity
Figure 29343DEST_PATH_IMAGE008
Size relatively carry out segmentation and calculate, namely work as V Or V
Figure 342830DEST_PATH_IMAGE020
The time, adopt respectively step (2) or step (3) to carry out analytical calculation, the vibration damper movement velocity VWhen changing continuously in 0～1.0m/s interval, piston hole restriction loss coefficient
Figure 760036DEST_PATH_IMAGE012
With the situation of change of speed, as shown in Figure 3.
Embodiment two: the piston bore internal diameter of certain hydraulic buffer
Figure 259150DEST_PATH_IMAGE015
, diameter of piston rod d g=18mm, the piston hole diameter , the piston hole number
Figure 4569DEST_PATH_IMAGE022
, fluid kinematic viscosity
Figure 276282DEST_PATH_IMAGE006
=
Figure 946298DEST_PATH_IMAGE018
m 2/ s, the critical Reynolds number Rec=2300 of fluid laminar flow and turbulent flow.
Adopt the design procedure of embodiment one, according to structural parameters and the fluid parameter of damper piston body, to this vibration damper critical velocity
Figure 529726DEST_PATH_IMAGE001
And the piston hole restriction loss coefficient in the friction speed situation
Figure 684501DEST_PATH_IMAGE012
Calculate, wherein, the vibration damper critical velocity
Figure 200933DEST_PATH_IMAGE001
=0.6m/s, the vibration damper movement velocity VPiston hole during=0.3m/s is along journey restriction loss coefficient
Figure 510692DEST_PATH_IMAGE012
=0.0557; VPiston hole restriction loss coefficient during=0.7326m/s
Figure 987941DEST_PATH_IMAGE012
=0.0265; When changing continuously in 0～1.0m/s interval, the damper piston hole is along journey restriction loss coefficient
Figure 572506DEST_PATH_IMAGE012
With the situation of change of speed, as shown in Figure 4.

Claims (3)

1. the computing method of the non-linear restriction loss of hydraulic buffer fluid, its concrete steps are as follows:
(1) determine the vibration damper critical velocity
Figure 2013100738482100001DEST_PATH_IMAGE001
The point:
According to the damper piston internal diameter of cylinder
Figure 635411DEST_PATH_IMAGE002
, diameter of piston rod , the piston hole diameter And number
Figure 2013100738482100001DEST_PATH_IMAGE005
, fluid kinematic viscosity
Figure 149493DEST_PATH_IMAGE006
And the critical Reynolds number Rec=2300 of fluid laminar flow and turbulent flow, determine the vibration damper critical velocity
Figure 312490DEST_PATH_IMAGE001
:
Figure 2013100738482100001DEST_PATH_IMAGE007
;
(2) be less than or equal to critical velocity
Figure 479291DEST_PATH_IMAGE008
Along journey restriction loss coefficient calculations:
According in step (1)
Figure 122762DEST_PATH_IMAGE001
, when vibration damper speed V≤ V cThe time, fluid is laminar flow flowing of piston hole, along the stroke pressure loss coefficient is:
Figure 2013100738482100001DEST_PATH_IMAGE009
；
(3) greater than critical velocity
Figure 582562DEST_PATH_IMAGE008
Along journey restriction loss coefficient calculations:
According in step (1) , when vibration damper speed V V cThe time, fluid is turbulent flow flowing of piston hole, along the stroke pressure loss coefficient is:
；
(4) vibration damper arbitrary speed VUnder non-linearly calculate along the journey restriction loss:
According in step (1)
Figure 511445DEST_PATH_IMAGE001
, when vibration damper in arbitrary speed VThe time, according to vibration damper speed VWith critical velocity
Figure 955195DEST_PATH_IMAGE001
Size, according to step (2) or step (3), the non-linear of piston hole calculated along journey restriction loss coefficient respectively, that is:
。
2. the step (1) in method according to claim 1, it is characterized in that: according to the structural parameters of vibration damper and the structural parameters of piston body, fluid parameter and critical Reynolds number Rec determine the vibration damper critical velocity
Figure 296047DEST_PATH_IMAGE001
3. the step (2) in method ~ step (4) according to claim 1, is characterized in that: when vibration damper speed V＜ V cThe time, calculate according to step (2); When vibration damper speed V V cThe time, calculate according to step (3); Under any vibration damper speed conditions, carry out segmentation according to step (4) and calculate.
CN2013100738482A 2013-03-08 2013-03-08 Calculation method for nonlinearity throttling loss of oil fluid in hydraulic buffer Pending CN103116710A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107885924A (en) * 2017-11-01 2018-04-06 泉州装备制造研究所 A kind of performance simulation method of vehicle-mounted hydraulic damper
WO2020042820A1 (en) * 2018-08-29 2020-03-05 华南理工大学 Pressure loss calculation method for serial-connected type r vehicular shock absorber

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
周长城 等: "车辆悬架最佳阻尼匹配减振器设计", 《交通运输工程学报》 *
周长城: "《车辆悬架设计及理论》", 31 August 2011, 北京大学出版社 *
袁光明 等: "液压减振器节流损失及对阀系参数设计影响", 《液压与气动》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107885924A (en) * 2017-11-01 2018-04-06 泉州装备制造研究所 A kind of performance simulation method of vehicle-mounted hydraulic damper
CN107885924B (en) * 2017-11-01 2021-02-26 泉州装备制造研究所 Performance simulation method of vehicle-mounted hydraulic shock absorber
WO2020042820A1 (en) * 2018-08-29 2020-03-05 华南理工大学 Pressure loss calculation method for serial-connected type r vehicular shock absorber

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Application publication date: 20130522