無(wú)傳感器液壓系統(tǒng)的壓力實(shí)時(shí)監(jiān)測(cè)和控制————英語(yǔ)論文解讀-資料下載頁(yè)
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【正文】 he use of a pressure transmitter is achieved by utilising the internal PID capabilities of the VSD which has an output as shown in Fig. 9. (a) It can be seen that the pressure is controlled constantly about the required setpoint of 65 Kpa. From this data the best setpoint to use for the Closed Loop System using the Control Algorithm was to be 65 Kpa as it can be seen from the conventional system, control is possible.It can also be shown in Fig. 9. (b) that control around the setpoint was achieved, with the pressure fluctuating marginally. This was due largely to having to control system pressure by crude means of manually turning the outlet valve on the pump for open to closed and vice versa.Fig. 9. Closed loop system Pressurewith pressure transmitter feedback4 ConclusionThis project presents a new method to implement the pressure control of a hydraulic system without sensor, and developed a user friendly interface package to monitor, control and configure the system over Internet in realtime. A parison is carried out between conventional pressure control system and proposed control strategy. Based on the obtained data, we can see the proposed control strategy works well, however the performance is not better than the traditional one. Further work is required to improve the proposed strategy to achieve better accuracy and smoother response.References1. Australian Pump Manufactures Association Ltd: Australian Pump Technical Handbook, 3rd edn. APMA LTD, Canberra (1987)2. Darby, R.: Chemical Engineering Fluid Mechanics, 2nd edn. Marcel Dekker Incorporated, New York (2001)3. Davidson, G.: Centrifugal Pump: Parallel amp。 Series Operation. University of Pittsburgh School of Engineering (2002)4. Five Star Electric Motors: Using Variable Frequency Drives on Pump Systems. Five Star Electric Motors – Motors Controls Drives San Antonio (2005)5. Hydraulic Institute, Europump amp。 the . Department of Energys (DOE) Industrial Technologies Program: Variable Speed Pumping – A Guide to Successful Applications,6. Karassik, I., Krutzsch, W., Fraser, W., Messina, J.: Pump Handbook, 2nd edn. McGraw Hill Book Company, New York (1986)7. Minghua, F., Longya, X.: Computer Modeling of Interactions of an Electric Motor, Circulatory System, and Rotary Blood Pump., vol. 46. Lippincott Williams and Wilkins, Inc.(2000)8. Nelik, L.: Centrifugal and Rotary Pumps – Fundamentals with Applications. CRC Press,Boca Raton (1999)9. Trinkl, J., Mesana, T., Havlik, P., Mitsui, N., Demunck, J., Dion, I., Candelon, B., Monties, J.: Control of Pulsatile Rotary Pumps Without Pressure Sensors. Compendex Database,vol. 37 (1991)10. Vysta Virtual Automation Programming Platform Version – Help File: PDL Electronics. Napier, New Zealand (2002)11. Web Enabling Your Serial Device: Lantronix, Irvine, California (2002)
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