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外文翻譯---利用基于計(jì)算機(jī)的測(cè)量系統(tǒng)對(duì)液壓泵的參數(shù)進(jìn)行選擇的方法(編輯修改稿)

2025-07-08 22:31 本頁(yè)面
 

【文章內(nèi)容簡(jiǎn)介】 ing converters is observed simultaneously and saved on the disc. Fig. 2. Block diagram of the measuring system The system displays large versatility. Its modular structure makes it possible to modify the measuring stand. The user may connect to any channel of the system a desired sensor of a physical quantity. Then a converter suitable for the sensor has to be installed in that channel. The system includes a unit consisting of a digital measuring system with a processor, collecting signals from the system of modules of converters, including converters of temperature, pressure, rotational velocity, flow intensity and torque. Each unit may contain up to 16 modules. It is connected by interface RS . 232 to a standard PC. The unit processor operates the modules and provides serial transmission with the puter. If interface RS . 485 is used instead, up to 31 units may be connected to the system. The operation of the system can be pared to that of a sampling oscilloscope. The efficiency factor of the axial multipiston pump is determined in the following way: → The torque at the pump shaft is measured by means of an inductive torque meter Mi5 [6]. The measuring system of the inductive torque meter consists of a torque converter and an electronic measuring subsystem (Fig. 3). . Schematic diagram of the inductive torque meter 1 . inductive converter with a Wheatstone bridge, 2 and 3 . rotational transformers → Flow intensity Q is measured by means of a measuring set consisting of a turbine converter and a counting analog flow meter (Fig. 4). The angular velocity of the turbine rotor is the oretically assumed as a linear function of intensity Q(t) of the flowing oil [2]. Fig. 4. Schematic diagram of the measuring system of the tubine flow meter 1 .inductive converter, 2 . rotor. → The rotational velocity of the pump shaft and the engine is measured by counting the impulses sent by a magic disc converter situated at the engine shaft. → The pressures p were measured by means of electronic membrane pressure sensors. A diagram of a pneumaticelectric converter, which functions as a manometer with an output electric signal is presented in Fig. 5. The pressure is converted into an electric signal by means of the piezoelectric sensor. Resistors connected in a bridge are diffused in a quartz plate. The pressure deforms the plate, the diffused resistors change their resistance, and the bridge loses the equilibrium. Subsequently, the output signal of the bridge is transformed in the electronic system into a current signal whose
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