Full-scale experimental study of the dynamic performance of buried drainage pipes under polymer grouting trenchless rehabilitation

2019 ◽  
Vol 181 ◽  
pp. 121-133 ◽  
Author(s):  
Ren Wang ◽  
Fuming Wang ◽  
Jianguo Xu ◽  
Yanhui Zhong ◽  
Shikun Li
Keyword(s):  
Experimental Study ◽  
Dynamic Performance ◽  
Full Scale

Experimental study on dynamic performance of typical nonballasted track systems using a full-scale test rig

2016 ◽  
Vol 231 (4) ◽  
pp. 470-481 ◽  
Author(s):  
Mingze Wang ◽  
Chengbiao Cai ◽  
Shengyang Zhu ◽  
Wanming Zhai
Keyword(s):  
Experimental Study ◽  
Dynamic Stiffness ◽  
Dynamic Performance ◽  
Full Scale ◽  
Damping Coefficient ◽  
Full Scale Test ◽  
Test Rig ◽  
Scale Test ◽  
Stiffness And Damping Coefficient ◽  
Stiffness And Damping

This paper presents an experimental study on dynamic performance of China Railway Track System (CRTS) series track systems using a full-scale test rig. The test rig has been constructed based on 55.17 m long full-scale nonballasted tracks composed of four typical CRTS track elements in high-speed railways. First, the dynamic characteristics of different nonballasted tracks are investigated by conducting wheel-drop tests, where a wheel-drop testing vehicle with a dropping wheelset is devised to provide the wheel-drop load. The vibration levels of different track systems are assessed by the root-mean-square acceleration per one-third octave band, and the vibration transmission characteristics of the CRTS series tracks are evaluated by transfer functions. Further, a mathematical track model is used to extract the dynamic stiffness and damping coefficient of the four types of nonballasted track systems based on the wheel–rail impact response. The vibration characteristics, the dynamic stiffness, and damping coefficient of different nonballasted track systems under various wheel-drop heights are compared and discussed in detail.

An Experimental Study to Predict Dynamic Performance of Check Valve by Water Hammer

2019 ◽  
Vol 19 (1) ◽  
pp. 1-12
Author(s):  
Tae-Kook Park ◽  
Yong-Bum Lee ◽  
Jae-Hyeong Kim ◽  
Ki-Chun Lee ◽  
Dong-Cheon Baek
Keyword(s):  
Experimental Study ◽  
Dynamic Performance ◽  
Check Valve ◽  
Water Hammer

Full-Scale Experimental Study on the Smoke Characteristics of Train Fire Stopping at Rescue Station in Railway Tunnel

2010 ◽  
Vol 20 (3) ◽  
pp. 251-270
Author(s):  
L. F. Chen ◽  
L. H. Hu ◽  
Q. S. Wang ◽  
B. H. Liu ◽  
N. Meng ◽  
...  
Keyword(s):  
Experimental Study ◽  
Full Scale ◽  
Railway Tunnel

Yacht Keels - An Experimental Study

1975 ◽  
Author(s):  
Pierre DeSaix
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Center Of Gravity ◽  
Full Scale ◽  
Optimum Size ◽  
Hull Form ◽  
Size And Shape ◽  
Aspect Ratios ◽  
Current Design ◽  
Lateral Area

Model tests are presented for a series of nine keels; three aspect ratios, three sweep angles; all at constant lateral area, taper ratio and thickness ratio. The series is shown to bracket current design trends. These keels are all tested on the same canoe body, over a range of heel angles, lee-ways, and speeds. The results are presented in terms of full-scale sailing performance with due allowance for a reasonable ballast ratio and resulting vertical center of gravity for each keel. Optimum sweep angles for each aspect ratio are found. A second series of three keels, geometrically similar but varying in lateral area, is provided. Predictions of windward performance demonstrate the effect of keel size. An optimum size is found for three wind strengths. The results are for one hull form only. However, a method is suggested for estimating the effect of keel size and shape for any proposed design.

Theoretical and Experimental Study on Optimum Design of Gear Profile Modification Curves

2004 ◽  
Vol 471-472 ◽  
pp. 269-272
Author(s):  
Sheng Sheng Zhang ◽  
J.Z. Zheng ◽  
L. Cheng
Keyword(s):  
Experimental Study ◽  
Working Condition ◽  
Dynamic Performance ◽  
Gear Transmission ◽  
Important Method ◽  
Profile Modification ◽  
Gear Transmission System ◽  
System Vibration ◽  
Gear Profile ◽  
Specific Working

Gear profile modification is an important method for reducing system vibration and noise of a gear transmission. In this paper, three kinds of gear profile modification curves are studied, and relevant experiments are conducted. Some useful conclusions based on the theoretical analysis and experimental results have been obtained. Line, parabola and sinusoid modification curves are very useful in improving the dynamic performance of a gear transmission system by reducing system vibration and noise. In order to design the optimal tooth profile modification curve, the curve type must be decided firstly according to the specific working condition, and the curve parameters can be determined by means of optimum programming.

A full scale experimental study of prestressed stayed columns

2015 ◽  
Vol 100 ◽  
pp. 490-510 ◽  
Author(s):  
Miguel Serra ◽  
Ashkan Shahbazian ◽  
Luís Simões da Silva ◽  
Liliana Marques ◽  
Carlos Rebelo ◽  
...  
Keyword(s):  
Experimental Study ◽  
Full Scale
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