外文翻譯---利用基于計算機(jī)的測量系統(tǒng)對液壓泵的參數(shù)進(jìn)行選擇的方法

1、附 錄 三英文文獻(xiàn) 英文文獻(xiàn)MEASUREMENT SCIENCE REVIEW, Volume 1, Number 1, 2001MEASUREMENTS OF SELECTED PARAMETERS OF A HYDRAULIC PUMP BY MEANS OF A COMPUTER-BASED MEASURING SYSTEMTadeusz Zloto 1), Zygmunt Biernacki 2), Marek Kurkows

2、ki 2),1) Institute of Machine Technology and Production Automation,Czestochowa Technical University,Al. Armii Krajowej 21, 42-200 Czestochowa, Poland, e-mail:zloto@itm.pcz.czest.pl2) Institute of Electronics and Control

3、Systems, Czestochowa Technical University,Al. Armii Krajowej 17, 42-200 Czestochowa, Poland,e-mail: biernac@el.pcz.czest.pl , marekekb@poczta.onet.plAbstract: The basic characteristic parameters of the pump operation are

4、 presented. The parameters are monitored by a computer-based measuring system at a hydraulic stand. The structure of the measuring system and the construction of the measuring converters applied in the system are describ

5、ed.1 INTRODUCTIONDue to their important advantages, hydraulic drives and controls are commonly applied in a number of fields of mechanical engineering.The still increasing demand for hydraulic drives encourages research

6、on new constructional solutions intended to improve operating parameters, efficiency and to lower production cost.determine volumetric efficiency of the pump as a ratio of real flow intensity to theoretical flow intensit

7、y:(2) 1 t s s rzvt t tQ Q Q QQ Q q n ? ? ? ? ? ? ?The hydraulic-mechanical losses, on the other hand, cause the real torque applied to the pump shaft to be greater than the theoretical torque. This kind of loss is associ

8、ated with the flow resistance of the operating agent in the internal channels of the pump as weel as with friction losses occurring on the surface of all the moving parts. Since it is difficult to differentiate between t

9、he losses resulting from the two sources mentioned above, they are considered jointly as hydraulic-mechanical efficiency, which may be expressed as the loss torque. The real torque can be represented as a sum of the theo

10、retical torque and the loss torque:(3) rz t s M M M ? ?The hydraulic mechanical efficiency of the pump is defined as：(4) 11t thms rz t stM MM M M MM? ? ? ? ? ?Ultimately, the total efficiency of the pump is

11、 equal to the ratio of the c ?effective power to the power supplied to the pump shaft:(5) erzNN ? ?After transformations the following was obtained：(6) 2 2n v rzv v hmrz rzq n p q pn M M? ? ? ? ? ? ?? ? ?? ?? ? ? ? ? ?