Hydraulic System Four Pole Configuration
A fundamental limitation in the familiar transfer function description of physical hardware lies in its characterization of input and output conditions in terms of single variables at each location. When a second device is coupled to a first at its output, it will draw some power from the first. Definition of this power is impossible in terms of a single variable; two are required. For example, using impedance methods when loading is not insignificant, requires three pieces of information, only one is available the unloaded transfer function, the other two are the input and the output impedances.We introduce in this paper the Four-Pole and Impedance coupling method, defining a component as a Two-Port Device, as one that exchanges energy with others at only two locations (ports), using the names effort variable and flow variable. A hydraulic system is a power transfer device Flow Rate Q (flow variable) times Pressure P (effort variable), same as Current I and Voltage V in electrical systems. One should look at hydraulic components that way and describe them as power in Pi, Qi to power out Po,Qo .In this paper we describe the derivation of hydraulic components as four-pole components; pumps, motors, valves, pipes, etc. at all levels .Using the Four-Pole coupling method, one can now set up a hydraulic system each separate component linearized differential equations LAPLACE transformed prepared for frequency domain analysis. In a typical hydraulic circuit the system is assembled from more-or-less standard building blocks, pumps, valves, motors, piping, filters and accumulators. The presentation of the system in four pole configuration has big advantages and is particularly helpful in the process of designing new systems. Rather than each time breaking down the system to the component level, say, pump into fluid and mechanical elements, it may be more efficient to develop only once the components model and couple these models to create an overall system.Finally, this approach is particularly useful with computerized analysis techniques of large and complicated hydraulic systems.This communication deals with the modeling and control of electro-hydraulic position actuators in the presence of structural anchorage or transmission compliance. Attention is focused on the definition of design rules to be used by the designer during the first stage of actuation design of integrated actuation package (IAP). Firstly, the detailed model with structural compliance is built in the environment of AMEsim, then simplified the complete model into linear one for the preliminary design consideration in MATLAB. The control design results are got from linear analysis of the actuator model, minimizing a modified integral of time absolute error criteria (MITAE). Once introduced the employed methodology, the MITAE criteria is compared to usual design criteria in absence of structural compliance for proportional control. Finally, the influence of structure compliance on performance and the basic design rules are pointed up.
hydraulic system Four-Pole configuration
Arie Perry
Israel Aerospace Industries (IAI), Ben Gurion International Airport, 70100, Israel
国际会议
北戴河
英文
1-5
2007-06-06（万方平台首次上网日期，不代表论文的发表时间）