Experimental Study on Dynamic Interaction between Large U-Shape Aqueduct and Water

2021 ◽  
Author(s):  
Haibo Wang ◽  
Chunlei Li ◽  
Lijun Zhao
Keyword(s):  
Experimental Study ◽  
Dynamic Interaction

Experimental Study of Dynamic Interaction Between a Steam Generator Tube and an Anti-Vibration Bar

2010 ◽  
Author(s):  
V. Lalonde ◽  
A. Ross ◽  
M. J. Pettigrew ◽  
I. Nowlan
Keyword(s):  
Experimental Study ◽  
Dynamic Behavior ◽  
Steam Generator ◽  
Contact Force ◽  
Dynamic Interaction ◽  
Work Rate ◽  
Fretting Wear ◽  
Steam Generators ◽  
Simply Supported ◽  
Excitation Force

A first experimental work was previously carried out to study the dynamic behavior of a tube simply supported at both ends in interaction with an anti-vibration bar at mid-span. This paper presents modifications to the previous setup with the aim of improving the accuracy of the results. A comparison of the dynamic behavior of the tube is made between both setups. The objective of this experimental study is to characterize the vibration behavior of U-tubes found in steam generators of nuclear power plants. Indeed, two-phase cross-flow in the U-tubes section of steam generators can cause many problems related to vibration. In fact, flow-induced vibration of the U-tubes can cause impacts or rubbing of the tubes against their flat bar supports. Variation of the clearance between the AVB and the U-tubes may lead to ineffective supports. The resulting in-plane and out-of-plane motions of the tubes are causing fretting-wear and impact abrasion. In this study, the clearance between the tube and the AVB, as well as the amplitude, form and frequency of the excitation force are controlled parameters. The first two modes of the tube are studied. The modifications made to the setup lead to significant improvements in the results. The natural frequencies of both setups are compared to theoretical values. The difference between experimental and theoretical frequencies confirms that the new setup better represents the theoretical model of a simply supported tube. The damping of both setups is also compared to values found in literature. The results show that the new setup is more representative of realistic steam generator situations. Compared to the first setup, the displacements of the new setup clearly indicate that the movement of the tube is mostly parallel to the flat bar and in the same direction as the excitation force. The whirling motion of the tube is prevented in the new setup. The accuracy of the contact force as a function of clearance was also improved. The use of more sensitive force sensors helped to reduce the noise level of the contact force. Finally, the dynamic interaction between the tube and the AVB, defined by the fretting wear work-rate, presents a more consistent behavior. The maximum work-rate occurs when the tube is excited around the second mode for clearance between −0.10 and 0.00 mm. Such clearance between the tube and the AVB should then be avoided to minimize fretting damage.

Experimental study on dynamic interaction between pipe and rollers in deep S-lay

2019 ◽  
Vol 175 ◽  
pp. 188-196 ◽  
Author(s):  
Hui Liang ◽  
Yan Zhao ◽  
Qianjin Yue
Keyword(s):  
Experimental Study ◽  
Dynamic Interaction

Computational and experimental study of a captive annular eddy

1967 ◽  
Vol 28 (1) ◽  
pp. 43-64 ◽  
Author(s):  
Enzo O. Macagno ◽  
Tin-Kan Hung
Keyword(s):  
Experimental Study ◽  
Reynolds Number ◽  
Laminar Flow ◽  
Viscous Liquid ◽  
Energy Exchange ◽  
Dynamic Interaction ◽  
Main Flow ◽  
Main Role ◽  
Small Energy

Results of calculations and experiments on the flow of a viscous liquid through an axisymmetric conduit expansion are reported. The streamlines and vorticity contours are presented as functions of the Reynolds number of the flow. The dynamic interaction between the main flow and the captive eddy between it and the walls is analysed, and it is concluded that, for laminar flow, the main role of the eddy is that of shaping the flow with a rather small energy exchange.

scholarly journals Experimental study on dynamic interference effect of two closely spaced machine foundations

2016 ◽  
Vol 53 (2) ◽  
pp. 196-209 ◽  
Author(s):  
Abhijeet Swain ◽  
Priyanka Ghosh
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Dynamic Condition ◽  
Dynamic Interaction ◽  
Scale Model ◽  
Harmonic Load ◽  
Machine Vibration ◽  
Large Scale Model ◽  
Local Soil ◽  
Wide Range

This paper presents an experimental study on the dynamic interaction effect of closely spaced square foundations under machine vibration. Under a dynamic condition, a number of large-scale model tests were conducted in the field, which includes a wide range of study on the isolated as well as interacting footing response resting on the local soil available at Kanpur, India. The dynamic interaction of different combinations (size) of two-footing assemblies was investigated by inducing vertical harmonic load on one of the footings (active footing), while the other footing (passive footing) was loaded with static weight only. The active footing was excited with different magnitudes of dynamic loading and the response was recorded for both footings, placed at a different clear spacing (S). The results are compiled and shown as the variation of displacement amplitude with frequency. The transmission ratio that predicts the effect of dynamic excitation of the active footing on the passive one is determined for the interacting footings and plotted with respect to frequency ratio.

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