Dissertation > Excellent graduate degree dissertation topics show

On the Mechanisim and Application of No Throttle Loss Valve Control Power Unit

Author: ZhangYongQiang
Tutor: ShiGuangLin
School: Shanghai Jiaotong University
Course: Mechanical Engineering
Keywords: valve control power unit no throttle loss energy saving high speed ON/OFF valve position control force control
CLC: TH134
Type: Master's thesis
Year: 2012
Downloads: 66
Quote: 0
Read: Download Dissertation

Abstract


Compared with mechanical and electrical transmission, hydraulic systems have advantages of larger power density, wide range of speed regulation, and easy realization of overload protection. However, the throttle loss and relief loss in the traditional hydraulic systems reduce the system efficiency to about 30%. From the aspect of decreasing the power loss in hydraulic systems, a new concept of no throttle loss valve control power unit ( NTLVCPU ) is put forward in the dissertation.Firstly, according to the reasons of power loss in the traditional hydraulic systems, the mechanism of NTLVCPU is stated. A 2/3 high speed ON/OFF valve is employed to control a high flow rate 2-way cartridge valve. The two valves compose the no throttle loss valve group. The basis for choosing the cartridge valve is given and a high speed ON/OFF spool valve is designed.Then, the mathematical models of high speed ON/OFF valve, 2-way cartridge valve and energy absorbing unit are established. Besides, the sub-model of linear stepping motor is developed in AMESet. All of the models are tested in AMESim. After the setting of parameters of models, simulations are performed. The results imply a small amount of throttle loss appears and relief loss is completely avoided when the main valve is opened. The efficiency of the system can reach up to more than 90%.Finally, the position control and the force control systems based on the NTLVCPU are studied respectively. Four no throttle loss valve groups are used to control the movement of a cylinder, which breaks the coupling relationships in traditional proportional and servo valves. The simulation models and control strategies of position and force control system are provided respectively. The effects of PWM control frequency and response frequency of high speed ON/OFF valve to the control performances and energy saving are discussed in the position control system. And three different control logics are compared in the force control system. The step and sinusoidal response in two systems verify these kinds of new systems can ensure a certain degree of control accuracy and improve the system efficiency largely.The results of the above researches provide the theoretical basis for further actual applications.

Related Dissertations

  1. Model of Cylinder Controlled by On-Off Valve and System of PWM Control,TH138
  2. Several Problems of Energy Saving Operation in Air Conditioning System of Large Scale Public Buildings,TU831.6
  3. Research on University’s Energy Saving System Facing the Construction of Green University,G647
  4. Study on a Pneumatic Manipulator Clamping Force Control System Based on H ∞ Control Theory,TP241
  5. Applied Research of Emulsified Fuel on S195 Diesel Engine,TE626.24
  6. Location Assisted Wi-Fi Discovery on Mobile Devices for Energy Saving,TN929.53
  7. Research on Key Technology of Recycling Horizontal Subsea Pipe Conector,TE973
  8. Shaking Table Test Study on the Seismic Performance of the 1/2 Model of the Energy–saving Block & Invisible Multi-ribbed Frame Structure,TU352.11
  9. Pneumatic Muscle Actuators humanoid design and control of the elbow,TP242
  10. Structure Design and Monitoring about Double Inclined Pylon Partial Cable-stayed Bridge Without Back-stays,U448.27
  11. The CHP System Energy Analysis and Optimized Reconstruction Research Based on Energy Quality Character,TM611.3
  12. Based on Global Value Chain Theory Tangshan Ceramic Industrial Cluster Development Strategy,F426.71
  13. Energy-saving Integrated Technologies for Recovery and Dehydration of Bioethanol,TQ223.122
  14. Preparation and Properties of high temperature infrared radiation paint,TQ637
  15. Parametric model of research -oriented energy optimization slab heating characteristics,TG335.3
  16. A Research on the Policy Implementation Performance of China’s Energy Saving and Emission Reduction in Power,F206;X322
  17. The Study on Hydraulic Balancing Optimization of Fluid Pipeline Network,TV134
  18. Research on Energy Conservation Cluster-based Routing and Collision Detection Algorithm of IOT,TP391.44
  19. Research on Driving Energy-saving Technology,U471.23
  20. Research on the Evaluation of Building Energy-saving Based on the Improved Value Engineering Method,F206;F224
  21. Study on the Target Evaluationing System of the Regional Boiler Room Heating Energy Efficiency Renovation,TU995

CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Control parts
© 2012 www.DissertationTopic.Net  Mobile