Theoretical Analysis of Step-Down of Hydraulic Cylinder Motion for Control Rod Hydraulic Drive System Based on Model II

2017 ◽  
Author(s):  
Qianfeng Liu ◽  
Yuzheng Li ◽  
Benke Qin ◽  
Bo Hanliang
Keyword(s):  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Energy Technology ◽  
Hydraulic Control ◽  
Transient Pressure ◽  
Control Rod ◽  
Tsinghua University ◽  
Motion Time ◽  
New Energy ◽  
Step Down

Hydraulic Control Rod Drive Technology (HCRDT) is a newly invented patent and Institute of Nuclear and New Energy Technology Tsinghua University own HCRDT’s independent intellectual property rights. The hydraulic cylinder is the key part of this technology, so the performance of the hydraulic cylinder directly affects the HCRDT. Firstly, the theoretical model of the cylinder hydraulic has been obtained and verified by the experiment. Second, the step-down process of the cylinder hydraulic is analyzed. The results are shown that the model can analyze the performance of the cylinder, including the motion time of the cylinder, the transient pressure of the cylinder arrival, the transient impact energy of the cylinder arrival. At last, the cylinder and the drive mechanism can be optimized based on the result.

Experimental Study and Analysis of the Deformable Pipe of CRHDM

2018 ◽  
Author(s):  
Yuzheng Li ◽  
Huang Zhang ◽  
Qianfeng Liu ◽  
Bo Hanliang
Keyword(s):  
Experimental Study ◽  
Intellectual Property Rights ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Energy Technology ◽  
Hydraulic Control ◽  
Control Rod ◽  
Tsinghua University ◽  
System A ◽  
New Energy

Hydraulic Control Rod Drive Technology (HCRDT) is a newly invented patent owned by Institute of Nuclear and New Energy Technology Tsinghua University with independent intellectual property rights. The hydraulic cylinder which is connected by the deformable pipe is the key part of this technology, so the performance of the deformable pipe directly affects the function of the hydraulic cylinder and the HCRDT. Based on the conditions occurring in the operation of the Control Rod Hydraulic Drive System, a kind of new deformable pipe is designed and has been tested by the experiment and analyzed by ANSYS. The result shows that the longer deformable pipe is the longer its lifetime is firstly. Second, lifetime of the deformable pipe which has net is longer. Furthermore, the design of HCRDT can be optimized.

Thermal Analysis of the Head of the Direct Action Solenoid Valve

2013 ◽  
Author(s):  
Qian-feng Liu ◽  
Han-liang Bo
Keyword(s):  
Direct Action ◽  
Hydraulic Drive ◽  
Thermal Characteristics ◽  
Solenoid Valve ◽  
Energy Technology ◽  
Hydraulic Control ◽  
Control Rod ◽  
Tsinghua University ◽  
Coefficient Of Thermal Conductivity ◽  
New Energy

Hydraulic Control Rod Drive Technology (HCRDT) is a newly invented patent and Institute of Nuclear and New Energy Technology Tsinghua University owns HCRDT’s independent intellectual property rights. The Integrated valve which is made up of three direct action solenoid valves is the key part of this technology, so the performance of the solenoid valve directly affects the function of the integrated valve and the HCRDT. On one hand, based on the conditions occurring in the operation of the Control Rod Hydraulic Drive System, the thermal characteristics of the head of the valve are analyzed by ANSYS. On the other hand, the numerical results are verified by the experiment. The results show that the temperature of the head of the solenoid valve increases with the current increasing firstly. Second, the highest temperature of the head is obtained so the current can be selected. Third, the coefficient of thermal conductivity of the head of the valve is obtained, which can be applied to other analysis of the solenoid valve.

Experimental Study of Motion-Resistance Force of Hydraulic Cylinder of CRHDM

2018 ◽  
Author(s):  
Qianfeng Liu ◽  
Yuzheng Li ◽  
Huang Zhang ◽  
Bo Hanliang
Keyword(s):  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Resistance Force ◽  
Coupling Scheme ◽  
Seal Ring ◽  
Hydraulic Control ◽  
Control Rod ◽  
Design And Optimization ◽  
Motion Resistance ◽  
New Energy

Hydraulic control rod drive technology (HCRDT) is a newly invented patent owned by Institute of Nuclear and New Energy Technology of Tsinghua University with independent intellectual property rights. Hydraulic cylinder is the core part of this technology, so the seal of hydraulic cylinder directly affects the performance of the hydraulic cylinder and HCRDT. A new experiment table was designed and used to study the leakage and internal cylinder friction at various types of friction coupling between internal cylinder and seal ring. The result shows that Motion-Resistance Force is the smallest when the internal cylinder film is TiN. Furthermore, when seal ring film is DLC (Diamond-like carbon) the leakage is the smallest. At last, the best friction coupling scheme was obtained. The experimental results provide the basis for the establishment of the motion model of hydraulic cylinder, which provides a foundation for further design and optimization of hydraulic drive technology of control rod.

Analysis of Flow Resistance Influence on Step-Down Process of the Control Rod Hydraulic Drive System

2021 ◽  
Author(s):  
Linqing Yang ◽  
Benke Qin ◽  
Hanliang Bo
Keyword(s):  
Theoretical Model ◽  
Flow Resistance ◽  
Inflection Point ◽  
Great Influence ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Drive System ◽  
Pressure Curve ◽  
Control Rod ◽  
Step Down

Abstract Control rod hydraulic drive system (CRHDS) is a new type of built-in control rod drive technology which is invented by INET, Tsinghua University. The integrated valve (IV) is the main flow control component of the CRHDS. Flow resistance of IV has a great influence on the control rod dynamic step-down process. The step-down performance experiments of CRHDS with different flow resistance of IV were conducted under room temperature conditions. Meanwhile, the theoretical model of hydraulic cylinder step-down process was established and combined with the relationship of the flow resistance of IV under the experimental conditions to get the dynamic response of the hydraulic cylinder. The calculation results of theoretical model agree well with the experimental data. On this basis, the theoretical model of hydraulic cylinder step-down process was applied to the high temperature working conditions with different flow resistance of IV. The analysis results show that at higher working temperature, with the increase of the flow resistance of IV control rod step-down average velocity decreases and step-down time increases correspondingly. There is an inflection point in the transient pressure curve and the pressure of the inflection point decreases gradually with the increase of the flow resistance. The pressure lag time after step-down also decreases. The research results lay the base for the design and optimization of the flow resistance of the IV for the CRHDS.

Numerical Simulation of the Head of the Direct Action Solenoid Valve Under the High Temperature Condition

2016 ◽  
Author(s):  
Qianfeng Liu ◽  
FuLong Zhao ◽  
Hanliang Bo
Keyword(s):  
High Temperature ◽  
Thermal Field ◽  
Direct Action ◽  
Hydraulic Drive ◽  
Decomposition Temperature ◽  
Solenoid Valve ◽  
Hydraulic Control ◽  
Control Rod ◽  
New Energy ◽  
High Temperature Condition

This solenoid valve is used in the Hydraulic Control Rod Drive Technology (HCRDT). The Technology is a newly invented patent and the Institute of Nuclear and New Energy Technology Tsinghua University owns HCRDT’s independent intellectual property rights. The Integrated valve which is made up of three direct action solenoid valves is the key part of this technology, so the performance of the solenoid valve directly affects the function of the integrated valve and the HCRDT. On one hand, based on the conditions occurring in the operation of the Control Rod Hydraulic Drive System, the thermal field of the head is analyzed by ANSYS. The result shows that the highest temperature is below the decomposition temperature of the coil. Second, the performance of the head is obtained in the high temperature. Third, a method is presented to monitor the performance of the valve while the reactor is working. On the other hand, the head of the direct action solenoid valve in high temperature is studied by the experiment. In a word, the solenoid valve has a good performance under high temperature condition.

Impact Assessment of Dynamic Characteristics on the Hydraulic Driven Machinery Operation

2018 ◽  
pp. 1-12
Author(s):  
A. D. Terenteva
Keyword(s):  
Dynamic Error ◽  
Total Error ◽  
Soil Layer ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Working Mechanism ◽  
Automated Control ◽  
Vertical Coordinate ◽  
Construction Machinery ◽  
The Difference

In civil engineering in Russia, trenching for utilities is currently under digging. To perform such works, it is necessary to use high-precision construction machinery, because inaccurate performance of works can lead to the break down of existing utilities, thereby affecting the residents of nearby houses and demanding the additional works for renewal.The most universal labour saver to perform construction works is hydraulic driven single-bucket excavators, which provide up to 38% of works. Therefore, to improve technical characteristics that affect the accuracy of the work performed is an important task.High requirements for the performance of works are defined by existing construction regulations: an allowable soil layer to remain is at most 0.05 m. To fulfil such requirements, an exact assessment of the working mechanism position and a trench profile is necessary.Examination of a manually operated digging process shows that an operator provides operations untimely, however an automated control system can solve this problem. Dynamic phenomena in the working mechanism have the greatest impact on the accuracy of the works performed.To assess the bucket digging edge position accuracy, a mathematical model of the working mechanism has been created. Based on the cycle scheme of the working process, the excessive displacements of the hydraulic cylinder rods under the load are taken into account. By the end of the cycle, the difference between the specified and obtained positions along the vertical coordinate has been 0.0892 m.A dynamic error of the hydraulic drive system of the working mechanism is considered as a sum of the error due to excessive displacements of the hydraulic cylinder rods and the error due to delay of the hydraulic drive, with the latter being calculated for the average time of delay taking into account the data available in the literature. The total error of the bucket digging edge position of the working mechanism is 0.1176 m, which is 2 times more than the value of 0.05 mConformity of all the links with specification requirements does not guarantee compliance with the required displacement accuracy of the bucket digging edge, and, thus, the soil layer to remain in the base of the trench can exceed the regulated value of 0.05 m.

Application of ultra-high molecular weight polyethylene in a hydraulic drive

2020 ◽  
pp. 77-78
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
High Molecular Weight ◽  
Hydraulic Drive ◽  
Control Valve ◽  
Hydraulic Control ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Oil ◽  
Ultra High Molecular Weight

The use of ultra-high molecular weight polyethylene (UHMW PE) for the manufacture of various parts, in particular cuffs for hydraulic drives, is proposed. The properties and advantages of UHMW PE in comparison with other polyethylene materials are considered. Keywords ultra-high molecular weight polyethylene, hydraulic pump, hydraulic motor, hydraulic control valve, hydraulic oil, low temperature. [email protected]

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