# Hydraulic pressure is inertial simulation unit

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Summary: Introduced to use hydraulic pump and electro-hydraulic the working principle that scale overflow a powerful person regards the hydraulic pressure that power is absorbed and controls element as unit of inertial and laden simulation and design method. Keyword: Hydraulic pressure of control of inertial imitate scale is inertial imitate, namely in order to be not imitate of inertial hydraulic pressure technology inertial (quality or moment of inertia) the effect. If use the methodological simulation of pure machinery,rotate inertial, the flywheel that is J with an inertia namely is very accurate, but the cost that makes an exact numerical value and activity balance good flywheel is very high, when the flywheel that needs a group of different numerical value especially, not only costly, and assemble and unassemble very complex, become especially when rotate speed is higher, although very small lopsided quality distributings,also can cause insecure consequence. With imitate of hydraulic pressure technology inertial although precision is not tall, but can make successive change, fit different operating mode need, and cost is low, working on the safe side, use machine of imitate of hydraulic pressure technology so inertial it is very significant. The conditional basis that 1 inertial imitate realizes Newton the 2nd law: The relation of force and driving force is: (1a) 　 or (in 1b) type: Fd, Td, driving force and driving moment; υ , N, the speed that the object moves and rotate speed; M, J, the quality of the object and moment of inertia. To type (1) takes Laplace trade, the result is as follows: Fd(s)=ms υ (form discusses only here (the rotational circumstance of 2b) , as to translation its principle is same. Because driving force arises,retarded motion is, adapt so type (2b) is: Type of 　 of Sn(s)=Td(s)/(2 π J)(3) (the block diagram of 3) is shown 1 times like the graph. Just think uses Jp of a small inertia, and the effect that other means will come to achieve J of a big inertia, in the graph the design on the foundation of 1 loses the program of feedback, if pursue,2 are shown. Graph 1 graph 2 　 pursue 2 in, h(s) , the transfer function of feedback link; TAd(s) , add moment of force (or) of feedback moment of force. Pursue according to feedback principle 2 can convey for: 〕 of Sn(s)= 〔 Td(s)-TAd(s) / (the result that 2 π Jp)(4) or 　 of Sn(s)=Td(s)/(2 π JP+H(s))(5) want to realize imitate J, criterion type (3) Ying Heng is equal to type (5) , namely 　 of Jp+H(s)(6) of π of 2 π J=2 solves 　 type (6) , get 　 H(s)=2 π (J-Jp)(7) 　 type (7) is not the sufficient requirement with inertial means inertial imitate to use other namely, and H(s) is one scale link. From the graph TAd=H(s) of 2 knowable and add moment of force.