基于AMESim的液压变压器输出压力特性仿真研究
2022-04-26
来源:易榕旅网
机Oct.2012 床与液压 Vo1.40 No.19 Hydromechatronics Engineering DOI:10.3969/j.issn.1001-3881.2012.19.020 Simulation Study on Output Pressure Characteristics of Hydraulic Transformer Based on AMESim LIU Yiou ,HUANG Yanong,YU Jun,LI Shen Wuhan Second Ship Design Institute,Wuhan 430064,China Abstract:This paper ana ̄zes the principle of hydraulic transformer(HT).The modeling,simu‘ Iation and analysis of HT are established and accomplished in AMESIm.The output pressure curves of HT under diferent control angles are obtained.Simulation resuIts show that the real transformation ratio is not in accordance wIth the theoretical curve and a maximum value exists if the viscOus friticon and leakage are taken into account,and the steady output pressure pulsation and dynamic output pressure impact could be controlled in a reasonable zone. Key words:hydraulic transformer,output pressure characteristics,AMESim modeling,simula。 tion,transformation ratio In 1997,a new concept of HT called the Innas hydraulic transformer(IHT)was developed by Innas BV,Netherland. e new type HT,which integrated 1.1.Structure of hydraulic transformer As shown in Fig.1,the structure of Innas hy— draulic transformer was improved by using piston mo— the pump and motor together,has many advantages such as simpler structure,smaller size and higher ef- ifciency.Based on AMESim,modeling。simulation and analysis of output pressure characteristics of HT are carried out in this paper.The theoretical basis has been provided for the constuction design and re.r search of HT. tor.The A,B and T kidney ports connect the high pressure source,load pressure port and low pressure Snl】me. Sw 1.Structure and working principle of hy- draulic transformer The HT is a hydraulic component,which call a— chieve pressure transformation in the hydraulic trans— mission.The new type HT was gained based on fixed axial piston pump or axial piston motor,by changing Fig.1 Structure of the hydraulic transformer its two kidneys in swash plate into three.Through changing the control angle of valve plate,the flow in 1.2.Working principle of HT The working relationship between the piston and the valve plate is given in Fig.2.0 is the angle posi— tion of the kidney A relative to BDC of the plunger movement or the control angle of the hydraulic trans— former,while o/A,oL口and are the normal arc length and out of HT can be adjusted to reach the purpose of the output pressure contro1. Received:2012—08—23 LIU Yiou.E-mail:liuyou.hust@163.com of each kidney,respectively. LIU Yiou,et al:Simulation Study on Output Pressure Characteristics of Hydraulic Transformer Based on AMESim 105 TDC BDC Fig.2 The position relationship of piston and valve plate When 0=0.the left and fight area of kidney A are equal,then driven torque nad brake torque which carried on the cylinder byP^fire also equal,the cyl— inder does not move.When 0>0.the cylinder gets rotated with a certain speed.With the turning of the cylinder,take no account of t0_ 时.I I10_【h 爵吕.e frIoH∞II时.iction torque,tI he total torque generated by the three kidney p0rt6 5 4 3 2 l O s are as follows: △ = 十 + =., (1) T kidney port connects with tank,P =0,T 0.When + >0,the HT is speeded up,when + =0,the HT runs at a certain speed. As shown in Fig.3,when 0=60。,pistons suck oil from A and Tl,discharges oil from B and , since the amount of sucked and qual,the pressureA equals to pressure B.The result is in accordance with theoretical transformation ratio as shown in Fig.4. Fig.3 The inlet and outlet chamber volumes of the pistons,when 0=60。 From Eq.(1),the pressure ratio of PB to PA could be obtained as follows[1]: sin in A: : PA sin( 2一 ), .sin 2 (2) Where, A= 口=120。,the function CHINe of the transformation ratio A and control angle 0 is as fol— lOWS: 10 20 30 40 50 6O 7O 8O 90100l10120 Control angle 0/(。) Fig.4 Plot of transformation ratio with control angle 2.A ⅢSim model of HT 2.1.Piston movement model ofHT With the cylinder turning,the piston of HT is under the control of swash plate to back and forth moving.When the swash plate angle is fixed,the relative velocity of the piston as compared to the cyl- inder is舀Ven by[2]: =wRtanflsin (3) hWere,R is distribution radius of piston,卢is hte inclination angle of swash plate,o9 is angular ve— locity of cylinder, is rotational coordinate. The piston movement model based on AMESim is shown in Fig.5.Velocity switcher can change the input signal to linear velocity according to the func tion. Fig.5 AMESim model of a piston movement From Eq.(3),the velocity function of piston can be given as: , )=tan((-rr/180)x)sin(( ̄r/180)y)(4) 2.2.AMESim model of a piston inlet and outlet Considering the viscous firction and inner leak・ Hydromechatronics Engineering age,inlet and outlet model of the piston are as fol- lows: As shown in Fig.6,the flow area of the piston 砖 苫 .II1∞呐 .I口 ej0 chamber iS related with the cylinder angle and valve plate control angle,the valve plate control angle is defined by a global parameter.The flow area is ex— pressed as the open area of the variable throttle valve.And three kidney ports in valve plate are con- nected with A,B and T ports under the control of the signal switcher and function curve. Fig.6 AMESim model of a piston inlet and outlet Tab.1 Simulation parameters Bd /。鲁∞∞ Id售拿l10 ≈ = .Ins∞。ld lne 0 ∞∞ 3.Output pressure characteristics analysis Of HT In order to analyze the output pressure charac- teristics of HT,the plots of output pressure with time are shown in Fig.7 when 0=20。,60。and 100。,re一 spectivley. /= nz=412.8(nz) 60 ~、 30 25 1.2O 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 tiS 0.1O 20 l 5 l0 5 0 O 0 O.08 O.06 0.04 0.02 _ ●0.00 O.O I 1I I .I. I .... . . . x 10 1.O 2.0 3.0 4.0 5.0 6.0 f/Hz 0.5 1.O 1.5 t/s 2.O 2.5 3.0 Fig.8 FFr of the hydraulic transformer steady output pressure,where 0=100。 Fig.7 The output pressure curves of hydraulic transformer It indicates that steady output pressure pulsation From Fig.8。it could be concluded that the of HT is mainly depend on the inherence pulsation of piston pump. smaller the control angle,the shorter the steady re. sponse time.At the same time,the impact of start—up pressure gets decreased. As shown in Fig.9,when 0=100。,main frequency of the steady output pressure iS 412.5 Hz.the aver- age rotation speed is 2 752 r/min.Under the same ulsating frequency of piston pump could parameters,P be calculated as follows: From Fig.10 we can find that when 0<14。.the HT gets stopped since the driven torque is less than he friction torque.Witth the increase of 0.the rota— tion speed of HT gets improved.When 0=105.9。. the theoretical output flow nd power areach the maxi— mum,the transformation ratio reaches the maximum value as well;Then,the rotation speed gets in— 108 Hydmmechatronics Engineering 4)Greater moment of inertia and smaller swash plate angle are propitious to restrain the pressure im— pact in regulating process of HT. hased on AMESIM[J].Modem Manufacturing Engineer- ing,2008(11):1cr7—109. [4]LU Ning,FU Yongling,SUN Xinxue.Diigtal modeling of double press axil piaston pump and its thermal analysis References: OUYANG Xiaoping.Research on the hydraulic transform- basing on AMEsIM[J].Journal of Beijing University of Aeronautics and Astronautics,2006,32(9):1o55—1058. [5]PeterA JA,Zhao F,GeorgesEM,eta1.Trnsaformingfu— ture hydraulics:a new desin of a hydgraulic transformer er[D].Hangzhou:Mechanical and energy Engineering College,2005. [c].Ⅱnk ping,Swedeni The F/fth Scandinavin alntema- tional Conference on nuid Power.1997. [2] ZHAI Peixiang.Design of swash plate axial piston pump [M].Seijing: China Coal Industry Publishing House,1987. 『6] Wemdin R.陆ciency performance nd acontrol spectas of a hydraulic transfomer[C]r//Tampere,Filaund:The Sixth Scandinavian International Conference on Fluid Power.1999:395—407. [3] GUO Yong,WANG Yonggang,YE Pengfei,et a1.Model— ing and simulation research on the axial piston pump 基于AMESim的液压变压器输出压力特性仿真研究 刘贻欧 ,黄亚农,于俊,黎申 武汉第二船舶设计研究所,武汉430064 摘要:分析了液压变压器的工作原理,利用AMESim软件对液压变压器进行建模、仿真和分析,得到 配流盘在不同控制角度下液压变压器的输出压力曲线。结果表明,在考虑粘性摩擦和泄漏的情况 下,液压变压器实际变压比曲线与理论曲线不一致,存在最大变压比;稳态输出压力脉动和动态输 出压力冲击可控制在合理范围之内。 关键词:液压变压器;输出压力特性;AMESim建模;仿真;变压比 中图分类号:THl37.7 (Continued on 42 page) 超高压水液压柱塞泵柱塞副泄漏性能分析 杨珍 ,吴德发,陈经跃,刘银水 430074 华中科技大学机械科学与工程学院,武汉摘要:针对额定压力80 MPa,额定流量8 L/min的超高压水液压柱塞泵的密封结构建立了泄漏模型。 对其进行了仿真分析,得到密封间隙大小、接触长度、柱塞两端压差等因素对泄漏量的影响。仿真 结果表明:该结构在超高压水液压泵中具有良好的密封性能,对泵结构的优化改进具有一定的指导 意义,并为后续的试验研究指明了方向。 关键词:水液压;超高压;柱塞泵;泄漏;AMESim 中图分类号:TH322