伺服阀的参数介绍

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1、SV00 - 3 position 4 port hydraulic servovalve三位四通液压伺服阀DescriptionSV00 is a simple submodel of a 4 ways 3 positions hydraulic servo-valve.SV00S 是个简单的三位四通液压伺服阀The spool dynamics is modeled as a 2nd order system with a specified natural frequency and damping ratio.线轴动力学建模为二阶系统与一个指定的固有频率和阻尼比For each of

2、the 4 possible flow paths in the central position :在中位的四个可能的流量路径：P to A, P to B, T to A and T to Ba flow rate in L/min and a corresponding pressure drop in bar must be specified for the path fully open. Also the critical flow number for transition between laminar and turbulent flow characteristics m

3、ust be given for each flow path. Normally this dimensionless number can be left at the default value.流量（L/min）和对应的压降（bar）必须是在阀口全开的情况下。层 流和湍流流动特性临界流数之间的过渡必须给每个流路径。通常这个无量纲数可以留下作为默认值。A deadband region can be specified. In this deadband it is assumed that for each flow path there is no flow.可以指定一个死区。在这死

4、区假设对于每个流量路径没有流量。For the two other positions, the flow paths are : fromP to A and fromB toT in the left block fromP toB and fromA to T in the right blockExternal variables 外部参数Internal variables 内部参数TitleVariableUnitTypeDefault value1fraction spool position 分数阀芯位移xnullexplicit state 显示状态02fractional

5、spool velocity 分数阀芯速度v1/sexplicitstate03port P flow coefficient (Cq)P 口流量系数cqpnullbasic variable4port P flow number (lambda)P 口的流数Lambdap (入)nullbasic variable5port P mean fluid velocityP 口的流体速度flvpm/sbasic variable6port P cross sectional areaP 口的横截面积areapmm*2basicvariable7port T flow coefficient (C

6、q)cqtnullbasicvariable8port T flow number (lambda)lambdatnullbasic variable9port T mean fluid velocityflv tm/sbasic variable10port T cross sectional areaarea tmm*2basicvariable11activity of hydraulic dissipation (servo)机构的液压能损失actRservoJactivityvariablenameReal parameters 真实参数TitleVariable nameUnitD

7、efault value1ports P to A flow rate at maximum valve opening 阀最大开口是p到a 口的流量qpaL/min1ports P to A corresponding pressure drop2-ppabar1P到A 口的对应的压降3ports P to A critical flow number (laminar - turbulent)P到A 口的临界流数(从层流到湍流)lcpanull10004ports B to T flow rate at maximum valve openingqbtL/min15ports B to T

8、 corresponding pressure droppbtbar16ports B to T critical flow number (laminar - turbulent)lcb tnull10007ports P to B flow rate at maximum valve openingqpbL/min18ports P to B corresponding pressure dropppbbar19ports P to B critical flow number (laminar - turbulent)lcpbnull100010ports A to T flow rat

9、e at maximum valve openingqatL/min111ports A to T corresponding pressure droppatbar112ports A to T critical flow number (laminar -lca tnull1000turbulent)13working density for pressure drop measurement 压降下的工作密度rhocharkg/m*385014working kinematic viscosity for pressure drop measurement压降下的工作粘度nucharcS

10、t6015valve rated current 阀的额定电流ira temA4016valve natural frequency 阀的固有频率wnHz8017valve damping ratio 阀的阻尼比zetanull0.818deadband as fraction of spool travel 死区是分数的阀芯位移dbandnull0Integer parameters 整体参数TitleVariable nameDefault value1index of hydraulic fluidindexf0fluid proper ties for pressure drop1:

11、from hydraulic fluid at reference2userfpmeasurementconditionsParameter settings 参数设置The index of hydraulic fluid parameter refers to a fluid type defined by an icon put on the sketch.液压流体参数指标是指把一个图标在草图上所定义的流体类型。Sketches and equations 草图和方程With this valve there are 4 flow paths P to A, P to B, T to A

12、 and T to B. These are considered to be equivalent to a variable orifices.The equivalent orifice area areap, areat are computed for each of these paths using the utility eqarea from flow rate / pressure drops pairs. These pairs correspond to the valve being fully open and are normally defined at ref

13、erence conditions (P0 = 0 bar, T0 = 20 C).But it is possible to use different conditions for density and viscosity by changing the value of the enumeration ( userfp) and inputing new values for those fluid properties.这个阀有4个流量路径P到A,P到B、T到A和T到B .这些被认为是 相当于一个可变孔。Areap为等效孔口面积，用这个公式eqarea计算流 经这个路径的流量/压降。

14、这些对阀的压降和流量是在阀口全开的情况 下计算的，同样是在参考条件(P0= Obar,T0 = 2OoC)。但它也可能有不同的条件通过改变列举密度和粘度的值，并输入新值对于这些流体 性质The input sig is normalized by division by irate and copied to y and modified, if necessary, by the function dlimit so that输入信号的归一化分工愤怒的，复制到y或修改后，如有必要，由该函数，以便dlimit-1 y 1Note that y gives the equilibrium spo

15、ol position whereas x gives the actual spool position. The second order lag utilitysndlag is then used to compute the derivatives of x and v which are xdot and vdot respectively.注意,y给平衡线轴位置而x给实际的线轴的位置。二阶滞后效用sndlag 然后用于计算导数的x,v,分别xdot和vdot。Note that there are number of distinct possibilities to consi

16、der.请注意,有很多不同的可能性考虑and the valve is saturated at the upper endX 三1是阀饱和的上端and the valve displacement is positive, not saturated and free of the deadbanddband W x 1和阀位移是积极的,不饱和和自由的死区and the valve is within the deadbanddband-dband W x 阀内死区the valve displacement is negative, not saturated and free of th

17、e deadband-1 W x dband这个阀位移为负,不饱和和自由的死区and the valve is saturated at the lower end阀是饱和的下端Rather than call the utility endst2 the code to enforce constraints on the movement of the spool modifying x, xdot, v and vdot if necessary is within the calculation function. After this we have而不是调用实用程序endst2代码

18、执行约束的运动线轴修改x,v和vdot xdot，必要 时在计算函数。在这之后我们有-1 x 1Treatment of transition between the modes is treated as a discontinuity but if there is no deadband, no discontinuity is triggered if x goes through the zero position.1- If x is saturated on the upper end stop, P is connected to A and B to T. The flow

19、rate at port A is calculated using the utility orif3f with orifice area areap . Similarly the flow rate at port T is calculated using the utility orif3f with orifice area areat . The other flow rates are calculated as如果x是饱和的上端停止,P是连接到A和B到T .A 口流量的计算使用工具与areap orif3f孔口面积。同样的T 口的流量计算使用工具与areatorif3f孔口

20、面积。其他的流量计算qp = -qaqb = -qt2- For x positive, not saturated and free of the deadband the calculations are as with case 1 but with areas the two areas multiplied by the factor对于x积极,不饱和和自由的死区，计算与例1但与地区的两个区域乘以系数3- If x is in the deadband region, all flow rates are zero.如果x是在死区地区，所有的流量是零For negative values of x, the method is similar to for cases 1 and 2.为负值的X,方法类似于例1和2。For more details concerning the calculation of power for activity analysis in this submodel, please refer to the definitions specific to this library.