Investigation on the lubrication regimes and dynamic characteristics of hydro-hybrid bearing of two-circuit main loop liquid sodium pump system

2018 ◽  
Vol 115 ◽  
pp. 220-232 ◽  
Author(s):  
Zhongliang Xie ◽  
Zhushi Rao ◽  
Na Ta
Keyword(s):  
Dynamic Characteristics ◽  
Sodium Pump ◽  
Liquid Sodium ◽  
Pump System ◽  
Lubrication Regimes ◽  
Main Loop ◽  
Hybrid Bearing

Analysis of the flow noises of the nuclear main pump caused by the high temperature liquid Sodium in the two-circuit main loop liquid Sodium pump system

2020 ◽  
Vol 145 ◽  
pp. 107550 ◽  
Author(s):  
Zhongliang Xie ◽  
Nawei Shen ◽  
Jianding Ge ◽  
Weidong Zhu ◽  
Pan Song ◽  
...  
Keyword(s):  
High Temperature ◽  
Sodium Pump ◽  
Liquid Sodium ◽  
Pump System ◽  
Main Loop ◽  
Temperature Liquid

Performance Analysis of High Speed Floating Ring Hybrid Bearing in the Laminar and Turbulent Regimes

2011 ◽  
Vol 197-198 ◽  
pp. 1776-1780 ◽  
Author(s):  
Hong Guo ◽  
Bo Qian Xia ◽  
Shao Qi Cen
Keyword(s):  
Reynolds Number ◽  
Laminar Flow ◽  
Turbulent Flow ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Load Capacity ◽  
Flow Equation ◽  
The Finite Element Method ◽  
Static And Dynamic Characteristics ◽  
Hybrid Bearing

This paper presents a theoretical study concerning the static and dynamic characteristics of high speed journal floating ring hybrid bearing compensated by interior restrictor under laminar flow and turbulent flow respectively. The turbulent flow fluid film control equations and the pressure boundary conditions of this floating ring bearing together with the restrictor flow equation are solved by using the Finite Element Method. The variation regularity of static and dynamic characteristics such as load capacity, friction power loss, stiffness, damping etc. is analyzed. By comparing the laminar flow results and turbulent flow results, it is found that the characteristics coefficients are adjacent under small Reynolds number (laminar flow is dominant). But the characteristics coefficients are discrepant under big Reynolds number (turbulent flow is dominant). So turbulence lubrication theory is more accurate to high speed floating ring bearing.

The Dynamic Characteristics and Design of a Plate Sewage Heat Exchanger

2014 ◽  
Vol 556-562 ◽  
pp. 755-758
Author(s):  
Dong Fang Sun ◽  
Na Qin ◽  
Lei Feng
Keyword(s):  
Heat Exchanger ◽  
Dynamic Characteristics ◽  
Plate Heat Exchanger ◽  
Velocity Variation ◽  
Design Parameters ◽  
Pump System ◽  
Heat Pump System ◽  
Plate Heat ◽  
Inlet Velocity ◽  
Exit Temperature

According to the design parameters of the actual project. In this essay, the plate heat exchanger will be selected as the heat exchanger of secondary sewage-source heat pump system . The plate heat exchanger was designed first calculation, according to the selected plate heat exchanger structure size, flow rate of the change on the influence of the dynamic characteristics, such as inlet velocity and outlet velocity on wall temperature, the influence of different inlet velocity variation signal effects of curves for exit temperature, etc.

The Research on the Design and its Dynamic Characteristics of Shell and Tube Sewage Heat Exchanger

2014 ◽  
Vol 577 ◽  
pp. 285-288
Author(s):  
Lei Feng ◽  
Na Qin ◽  
Dong Fang Sun
Keyword(s):  
Heat Exchanger ◽  
Dynamic Characteristics ◽  
Inlet Temperature ◽  
Design Calculation ◽  
Outlet Temperature ◽  
Pump System ◽  
Heat Pump System ◽  
Practical Engineering ◽  
Shell And Tube ◽  
Sewage Source

According to the design parameter of practical engineering, shell and tube sewage heat exchanger is chosen as heat exchanger of secondary sewage-source heat pump system. This paper commences from the design calculation of shell and tube sewage heat exchanger, followed by the analysis of dynamic characteristics influencing rule based on the chosen size. The influence of inlet temperature and outlet temperature on tube temperature and the influence of signal curve of different inlet temperature on outlet temperature are all included.

Rotor Dynamics Analysis and Testing of a Turbomolecular Pump Rotor-Bearing System

2011 ◽  
Author(s):  
Chih-Neng Hsu ◽  
Hsiao-Wei D. Chiang ◽  
Yu-Meng Huang ◽  
Ying-Chia Fu ◽  
Kuo-Hsun Hsu ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Dynamic Characteristics ◽  
Critical Speed ◽  
Experimental Measurements ◽  
Pump System ◽  
Pump Rotor ◽  
Turbomolecular Pump ◽  
Rotor Bearing ◽  
Bearing System

This study is focused on the dynamic characteristics of a vertical turbomolecular pump (TMP) rotor-bearing system. The research methods can be divided into two parts, which are numerical analysis and experimental measurements. In numerical analysis, we use the finite element analysis software DyRoBeS and ANSYS to construct a two- and three-dimensional models of the rotor-bearing system. In the analysis process, by using the pump system assembly testing data, we can verify the rotor-bearing system finite element models under different boundary conditions. Next, we calculate the Campbell diagram to study the dynamic characteristics of the rotor-bearing system, and to compare with the experimental results to verify the models. Finally, we found the relationship between the rotor critical speed and the bearing stiffness in order to study the design of the molecular pump rotor and the bearing system. Experimental measurements were divided into two parts: static modal tests and dynamic measurements. Static modal tests can provide the natural frequencies of the rotor-bearing system. Waterfall diagrams of the dynamic tests can measure the pump system critical speed from zero speed up to the working speed crossing, and to insure that the pump working speed is far from the critical speed of at least 10% in the safe margin. In summary, the results of the experimental measurements and numerical analysis can provide the basis for the design tool for turbomolecular pump rotor-bearing system in order to identify and prevent pump vibrations.

scholarly journals Effect of Temperature and Surface Roughness on the Tribological Behavior of Electric Motor Greases for Hybrid Bearing Materials

Lubricants ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 59
Author(s):  
Daniel Sanchez Garrido ◽  
Samuel Leventini ◽  
Ashlie Martini
Keyword(s):  
Surface Roughness ◽  
Friction And Wear ◽  
Tribological Behavior ◽  
Effect Of Temperature ◽  
Base Oil ◽  
Future Studies ◽  
Lubrication Regimes ◽  
Wide Range ◽  
Bearing Materials ◽  
Hybrid Bearing

Greased bearings in electric motors (EMs) are subject to a wide range of operational requirements and corresponding micro-environments. Consequently, greases must function effectively in these conditions. Here, the tribological performance of four market-available EM greases was characterized by measuring friction and wear of silicon nitride sliding on hardened 52100 steel. The EM greases evaluated had similar viscosity grades but different combinations of polyurea or lithium thickener with mineral or synthetic base oil. Measurements were performed at a range of temperature and surface roughness conditions to capture behavior in multiple lubrication regimes. Results enabled direct comparison of market-available products across different application-relevant metrics, and the analysis methods developed can be used as a baseline for future studies of EM grease performance.

Studying of Fuzzy Control for Fuel Injection System of Electronic Unit Integrated Pump

2013 ◽  
Vol 721 ◽  
pp. 492-496
Author(s):  
Bao Ming Chai ◽  
Long Hua ◽  
Zhi Qiang Xu
Keyword(s):  
Fuzzy Control ◽  
Dynamic Characteristics ◽  
Control Strategy ◽  
Fuel Injection ◽  
Simulation Software ◽  
Injection System ◽  
Fuel Injection System ◽  
Electronic Unit ◽  
Pump System ◽  
Fuzzy Control Strategy

Through the simulation analysis for the dynamic characteristics of supply pump cam of electronic unit integrated pump system (IEUP); using fuzzy control strategy, to design fuzzy controller, to realize integrated control of the multi-body model and the fuzzy control strategy, to analyze the working parameters of affecting dynamic characteristics of solenoid valve in Matlab/Simulink environment; using the aid of simulation software Hydsim, to establish the model of fuel injection system of electronic unit integrated pump and to analyze it; through the comprehensive analysis of the fuel injection system to get the parameters and conclusions, for the design and optimization of fuel injection system of electronic unit integrated pump and the improvement of fuel injection system of traditional diesel engine to provide theoretical support.

scholarly journals Field Test for a Base Isolation Structure on Condition of Horizontal and Initial Displacement

2021 ◽  
Vol 12 (1) ◽  
pp. 232
Author(s):  
Ying-Xiong Wu ◽  
Xin-Jun Dong ◽  
You-Qin Lin ◽  
Hao-De Cheng
Keyword(s):  
Dynamic Response ◽  
Dynamic Characteristics ◽  
Natural Vibration ◽  
Base Isolation ◽  
Seismic Structure ◽  
Control Effect ◽  
Initial Displacement ◽  
Pump System ◽  
Vibration Period ◽  
Isolation Layer

There are a few isolated structures that have been subjected to seismic testing. An isolated structure is incapable of tracking, adjusting, and controlling its dynamic characteristics. As a result, field evaluations of solitary structures’ dynamic characteristics are important. The horizontal initial displacement of a base isolation kindergarten made of 46 isolation bearings is 75 mm. The method for creating the horizontal initial displacement condition is illustrated, as are the primary test findings. Horizontal initial displacement is accomplished with the assistance of a reaction wall, rods, and hydraulic pump system. To begin, we removed the building using hydraulic jacks to produce horizontal displacement of the isolation layer and then attached rods to support the building. The rods were then shot and unloaded, causing the building to shake freely, and its dynamic response and other parameters were tested. The results indicate that the natural vibration period of an isolated structure is much greater than the natural vibration period of a seismic structure. The isolation layer’s hysteretic curve as completely filled; upon unloading, the isolation layer as promptly reset; the dynamic response control effect of each was visible, but the top floor’s acceleration was magnified by approximately 1.27 times.

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