An experimental study of the effect of gas density on the distortion and breakup mechanism of drops in high speed gas stream

The frequency of turbulent macroinstability occurrence was measured in liquids agitated in a cylindrical baffled vessel. As it has been proved by preceding experimental results of the authors, the stochastic quantity with frequency of occurrence of 10-1 to 100 s-1 is concerned. By suitable choosing the viscosity of liquids and frequency of impeller revolutins, the region of Reynolds mixing numbers was covered from the pure laminar up to fully developed turbulent regime. In addition to the equipment making it possible to record automatically the macroinstability occurrence, also the visualization method and videorecording were employed. It enabled us to describe in more detail the form of entire flow field in the agitated system and its behaviour in connection with the macroinstability occurrence. It follows from the experiments made that under turbulent regime of flow of agitated liquids the frequency of turbulent macroinstability occurrence is the same as the frequency of the primary circulation of agitated liquid.

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Experimental study of the frequency-domain characteristics of ground vibrations caused by a high-speed train running on non-ballasted track

Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit ◽

10.1177/0954409715577849 ◽

2015 ◽

Vol 230 (4) ◽

pp. 1131-1144 ◽

Cited By ~ 7

Author(s):

Ping Wang ◽

Kai Wei ◽

Li Wang ◽

Junhua Xiao

Keyword(s):

Experimental Study ◽

Frequency Domain ◽

High Speed ◽

High Speed Train ◽

Ground Vibrations ◽

Ballasted Track

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Study and Analysis of Anti Vibratory Passive and Active Methods Applied to Complex Mechanical System

Journal of Computational and Nonlinear Dynamics ◽

10.1115/1.4005236 ◽

2012 ◽

Vol 7 (2) ◽

Cited By ~ 2

Author(s):

Cédric Lopez ◽

François Malburet ◽

André Barraco

Keyword(s):

Experimental Study ◽

Comparative Analysis ◽

Mechanical System ◽

High Speed ◽

Test Bench ◽

Minimization Method ◽

Controlled System ◽

Proper Frequency ◽

Different Parts ◽

Methods Of Control

This paper studies problematic of a mechanical system composed of different coupled parts submitted to a high speed shock and proposes analysis of anti vibratory passive and active methods based on an experimental and theoretical coupled approach. After a shock, different parts of the system oscillate. If one of them is excited at a particular frequency, such as its proper frequency, important oscillations appear and can lead to the deterioration of the system by introducing important stresses. In this paper, we propose an analysis in order to understand this kind of problem and what we can do to avoid it. Firstly, we discuss problematic and we expose the studied system. In a second time, we develop two approaches of modeling that allow us to understand the phenomenon by carrying out numerical simulations. Then cross checking of model is completed via experimental study on drop test bench. Passive minimization method of vibrations based on experimental and theoretical coupled approach is exposed. Finally, a comparative analysis of different methods of control and experimental results of controlled system are presented.

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Effects of Cutting Parameters on Residual Stresses in High-Speed Milling of Ti-17

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.834-836.861 ◽

2013 ◽

Vol 834-836 ◽

pp. 861-865 ◽

Cited By ~ 1

Author(s):

Yong Shou Liang ◽

Jun Xue Ren ◽

Yuan Feng Luo ◽

Ding Hua Zhang

Keyword(s):

Experimental Study ◽

Residual Stresses ◽

High Speed ◽

Experimental Parameter ◽

Cutting Speed ◽

Cutting Parameters ◽

Single Factor ◽

Cutting Depth ◽

High Speed Milling ◽

Parameter Ranges

An experimental study was conducted to determine cutting parameters of high-speed milling of Ti-17 according to their effects on residual stresses. First, three groups of single factor experiments were carried out to reveal the effects of cutting parameters on residual stresses. Then sensitivity models were established to evaluate the influence degrees of cutting parameters on residual stresses. After that, three criteria were proposed to determine cutting parameters from experimental parameter ranges. In the experiments, the cutting parameter ranges are recommended as [371.8, 406.8] m/min, [0.363, 0.412] mm and [0, 0.018] mm/z for cutting speed, cutting depth and feed per tooth, respectively.

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