外文翻譯---利用基于計(jì)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-文庫吧
2025-01-03 14:58 本頁面
【正文】 p2 and suction pressure p1。It is known [4] that volumetric losses, which deteriorate the theoretical efficiency of pumps, result mostly from leakages of the operating agent from displacement chambers through gaps between displacement elements and the walls of chambers or body of the pump. Knowing volumetric losses one may determine volumetric efficiency of the pump as a ratio of real flow intensity to theoretical flow intensity: (2)The hydraulicmechanical 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 associated 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 the losses resulting from the two sources mentioned above, they are considered jointly as hydraulicmechanical efficiency, which may be expressed as the loss torque. The real torque can be represented as a sum of the theoretical torque and the loss torque: (3) The hydraulic mechanical efficiency of the pump is defined as： (4)Ultimately, the total efficiency of the pump is equal to the ratio of the effective power to the power supplied to the pump shaft: (5)After transformations the following was obtained： (6)Thus, the total pump efficiency is the product of volumetric efficiency and hydraulic mechanical efficiency.Fig. 1 presents the characteristic quantities necessary for determining the pump efficiency【4】。Fig. 1. Quantities characterizing pump operation3 COMPUTER MEASURING SYSTEM FOR THE PUMP OPERATION PARAMETERSThe use of puters in measuring systems and in control systems contributes towards the automation of measurements. It also improves the functioning of measuring systems by providing more sophisticated methods of data processing.Contemporary measuring devices based on microprocessor technology perform a number of functions, including measurements of diverse quantities. For monitoring the parameters of pump operation a puter measuring system has been developed. A block diagram of this system is presented in Fig. 2.The measuring system designed and constructed by the authors of the present paper includes a standard PC [5]. It is intended for automat
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