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Characteristic Analysis and Test Research of the Hydro-Viscous Speed Regulating System Based on the PID Control Technique

Author: SunQin
Tutor: YangQianMing
School: Shandong University of Science and Technology
Course: Precision instruments and machinery
Keywords: Liquid Viscous Clutch Newtonian fluid body friction law Mathematical model Computer Simulation PID regulator Experimental Analysis
CLC: TH132.46
Type: Master's thesis
Year: 2005
Downloads: 324
Quote: 0
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Abstract


Domestic high-power machinery and equipment start-up and braking mainly uses variable speed hydraulic coupling and frequency converter, show that long-term practice both in a certain extent, there is some defect or lack of. This has attracted the attention of academia and the business community in recent decades. Fan and water pump commonly used valve plate adjustment, the power consumption is considerable. Internationally recognized energy conservation is the fifth from coal, oil, hydro, nuclear energy. China's energy shortage has affected the development of the national economy, in a lot of energy, energy is the most common, a larger proportion of the energy, and therefore power saving is an important part of the energy-saving. Liquid Viscous Clutch, compared with a variable speed hydraulic coupling and inverter has the advantages of high transmission efficiency, overload protection, control of fast response, low cost, easy maintenance. The practice of the past two decades: the the Liquid Viscous Clutch as the start of the high-power machinery and equipment, speed and brake coupling device already associated equipment made good speed performance, to enable enterprises to achieve significant energy savings and economic benefits. . This paper gives the HVD drive load (pump or fan) system electro-hydraulic proportional control system output speed negative feedback control scheme based on analysis Liquid Viscous Clutch liquid friction zone, mixed friction areas and boundary friction zone operating conditions. When the friction plate group into the boundary friction, load output speed will be greater volatility. For the the Liquid Viscous Clutch speed unstable region, four effective measures to improve the speed unstable region comparative analysis that can take effective control - PID control method to reduce the speed unstable region; based on comprehensive of all the factors that may impact the system, to simplify the system, the establishment of a system of mathematical models. By means of simulation tools and software programming, computer simulation results analysis system mathematical model, the simulation results show that: the conventional control based on the Liquid Viscous Clutch PID control drive load system to have a good response performance with PID control regulation superior control performance; Finally, this research project HVD pump drive system, build a test bench, the actual online testing system parameters, the actual operating conditions of the physical parameters obtained important experimental data. The theoretical analysis and bench test: reasonable test system solutions built for the the HVD-driven pump test system; coincide test fitting curve with the theoretical simulation results show that the mathematical model in this paper is reasonable, correct.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > The transmission mechanism > Meshing > Reducer and transmission
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