The Effect of Pressure-Inducing System of Transducers of Dynamic Pressure Measurement

In this paper, we will r1rst introduce the methods and instrument or the indicated diagram of microcomputer testing compressor, and then we will emphasize the building of mathematical models of pressure-inducting system of the pressure transducer. Based on the analysis of frequency response, we will discuss how to reduce the distrubance. We hope our exploration may be helprul to those who are researching or applying the system of dynamic pressure measurement. INTR:)DUCTIJN Indicated diagrams are a particularly important testing-item in test on performance of reciprocating compressor. They can directly reflect the thermodynamic process of the machine, working behaviour of the valves, and operating mode for such parts as the stuffing, piston rings, etc., to a certain extent. In a long time, because of the imperrect measuring methods and improper operating, the indicated diagrams measured are often distorted. We always use a pressure duct to induce the medium pressure in the measured cylinder into a transducer. In this way, the pressure cavity and the pressure duct const~tute a pressure-inducting system whose natural frequency actually is lower than that of the pressure transducer. As a consequence, characteristics of rrequency response of the pressure-inducting system would arfect the dynamic measuring results.