Rotor dynamic analysis of the vertical hydro-hybrid bearing rotor coupled system of a two-circuit main loop liquid Sodium pump system

2021 ◽  
Vol 155 ◽  
pp. 108139
Author(s):  
Zhongliang Xie ◽  
Weidong Zhu
Keyword(s):  
Dynamic Analysis ◽  
Sodium Pump ◽  
Coupled System ◽  
Liquid Sodium ◽  
Pump System ◽  
Main Loop ◽  
Hybrid Bearing ◽  
Rotor Dynamic

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

Dynamic Analysis of Bridge-Approach Embankment Transition Segment

2012 ◽  
Vol 238 ◽  
pp. 719-722
Author(s):  
Zhen Xia Li ◽  
Yuan Zhao Chen
Keyword(s):  
Dynamic Analysis ◽  
Coupled System ◽  
Dynamic Responses ◽  
Subgrade Reaction ◽  
Track Dynamics ◽  
Bridge Approach

Dynamic responses of coupled system were analyzed when the speed of train was 350km/h and the transition was filled with graded broken stones mixed 5% cement. Results indicate that setting form of bridge-approach embankment section has little effect on dynamic responses, thus designers can choose it on account of practical circumstances. Based on the study from vehicle-track dynamics, we suggest that the coefficient of subgrade reaction (K30) should be greater than 190MPa within 0-5m zone behind abutment and be greater than 150MPa in other zones.

A Dynamic Analysis on the Transition Curve of Profiled Chamber Metering Pump

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Hua Lei ◽  
Huijün Hu ◽  
Yang Lu
Keyword(s):  
Dynamic Analysis ◽  
Mechanical Vibration ◽  
Transition Curve ◽  
Mechanical Resistance ◽  
Vane Pump ◽  
Pump System ◽  
Positive Displacement ◽  
The Face ◽  
Dynamic Performances ◽  
Loss Control

A profiled chamber metering pump (PCMP) is a new type of positive-displacement vane pump which is composed of a special stator and a rotor–slide assembly. The face-shaped curve of the inner chamber of the stator is formed by means of two quarter circular arcs and two quarter noncircular arcs, and one of the two quarter noncircular arcs is defined as transition curve. The geometry of the transition curve directly affects the dynamic performances of the pump system, including its mechanical vibration, friction, wear, and kinetic losses. This paper discusses a set of dynamic analysis methods that combine kinetic loss control with vibration control for optimization of the transition curve of the PCMP. At first, basic conception and work line on the method are explained. In a second step, by means of force analysis, a kinetic loss model is established. Then, the model is used to examine a group of vibration optimized curves in polynomial form, and kinetic losses caused by different mechanical resistance forces are calculated. Finally, through a comparison analysis together with vibration and kinetic losses, comprehensive optimal transition curves can be obtained.

Rotordynamic Evaluation of a Roughened-Land Hybrid Bearing

1999 ◽  
Vol 121 (1) ◽  
pp. 133-138 ◽  
Author(s):  
Patrice Fayolle ◽  
Dara W. Childs
Keyword(s):  
High Speed ◽  
Factor Model ◽  
Attractive Alternative ◽  
Good Prediction ◽  
Ball Bearings ◽  
Stiffness Coefficients ◽  
Leakage Flow Rate ◽  
Hybrid Bearing ◽  
San Andres ◽  
Rotor Dynamic

Hybrid bearings represent an attractive alternative to ball bearings for use in highspeed cryogenic turbopumps. However, the internally-developed cross-coupled forces can generate instabilities responsible for a speed limitation of the machine. To reduce these forces and raise the onset speed of instability, the use of deliberately-roughened stators, already successfully tested for liquid “damper” seals, is investigated. Rotor-dynamic results are presented for a five-pocket orifice-compensated hole-pattern-land hybrid bearing tested with water at high speed and high pressure. Experimental data show a good prediction of leakage flow rate and direct damping but a significant improvement in stability compared to a conventional smooth-land hybrid bearing, resulting in an elevation of the onset speed of instability. Comparisons between measurements and predictions from a code developed by San Andres (1994) shows good predictions for flowrate and direct damping but an over prediction for the direct and cross-coupled stiffness coefficients by about 30 and 50 percent, respectively. The use of the Moody friction-factor model is thought to be mainly responsible for the poorer predictions of stiffness coefficients.

Dynamic analysis of the pump system based on MOC–CFD coupled method

2015 ◽  
Vol 78 ◽  
pp. 60-69 ◽  
Author(s):  
Shuai Yang ◽  
Xin Chen ◽  
Dazhuan Wu ◽  
Peng Yan
Keyword(s):  
Dynamic Analysis ◽  
Pump System ◽  
Coupled Method

Dynamic Characteristics and Design Criteria for a Class of Vibration-Producing Machines

1963 ◽  
Vol 85 (3) ◽  
pp. 237-242
Author(s):  
Arthur D. Brickman ◽  
Barton L. Jenks
Keyword(s):  
Dynamic Analysis ◽  
Mechanical Vibration ◽  
Coupled System ◽  
Plane Motion ◽  
Gravity Center ◽  
Center Configuration ◽  
Rotational Components ◽  
Mass Spring ◽  
Design Factors ◽  
Oscillatory Force

Many self-contained machines used in industry serve to generate a sustained mechanical vibration for performing such diverse operations as vibration testing, hammering, material conveying, impacting, and screening. A particular class of such machines having only plane motion is idealized as a dynamic “vibrator” consisting of a two-mass, spring-coupled system driven internally by an oscillatory force. A dynamic analysis of this system is presented to show that the steady-state motion has both translational and rotational components. Specific methods are given for predicting the resultant direction and amplitude of motion for any point in the vibrator system. Results of the dynamic analysis show quantitatively the effect of system resonance, mass distribution, gravity-center configuration, and internal damping on vibrator operation and these design factors are discussed in terms of typical vibrator applications.

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