scholarly journals An experimental study of the influence of valve drive type on the dynamic loading and service life of valve seals of units

2021 ◽  
Vol 20 (2) ◽  
pp. 97-104
Author(s):  
Yu. I. Kondrashov ◽  
E. N. Ermilova ◽  
A. N. Vidyaskina
Keyword(s):  
Experimental Study ◽  
Service Life ◽  
Dynamic Loading ◽  
Operating Mode ◽  
Valve Design ◽  
Repeated Impact ◽  
Valve Drive ◽  
Different Response ◽  
Amplitude Characteristics

The article discusses an experimental study of the influence of the valve drive type on the dynamic loading and service life of valve seals of units. The results of research of the modes of closing of piston valves and bellows valves at different response speeds are presented. The differences in the amplitude characteristics of repeated impact, arising from the rapid return motion of the valves trim, in the piston and bellows versions of the valve are established. The influence of the operating mode on the service life in both versions of the valve design was assessed, and pressurized leakage tests were also carried out.

Experimental study on settlement of model piles in frozen soil under dynamic loading

1999 ◽  
Vol 42 (S1) ◽  
pp. 30-37 ◽  
Author(s):  
Jianming Zhang ◽  
Yuanlin Zhu ◽  
Jiayi Zhang
Keyword(s):  
Experimental Study ◽  
Dynamic Loading ◽  
Frozen Soil

A Mechatronic Approach to Compact Fluid Disc Valve Design

1995 ◽  
Vol 209 (2) ◽  
pp. 115-125
Author(s):  
G A Parker ◽  
Y B Sun
Keyword(s):  
Low Cost ◽  
Dynamic Performance ◽  
Operating Mode ◽  
Industrial Applications ◽  
Test Results ◽  
Valve Design ◽  
Electromagnetic Characteristics ◽  
High Control ◽  
Fail Safe ◽  
Pilot Valve

The work presented in this paper deals mainly with a mechatronic approach to compact disc valve design and concentrates on improvements to the disc valve electromagnetic characteristics, the diaphragm design and the dynamic performance. A novel diaphragm-disc force motor has been successfully developed incorporating a pair of permanent ring magnets. It has the advantages of low electric power consumption at the null position, dual-lane electrical structure for fail-safe operation, high control accuracy and should be competitive with existing torque motors due to its low cost and simple construction. The research involved designing and testing a prototype disc pilot valve with a dual-lane operating mode. The test results showed that the valve has satisfactory static and dynamic characteristics for industrial applications.

scholarly journals A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

2017 ◽  
Vol 50 (2) ◽  
pp. 41-62
Author(s):  
Ahmad Mardoukhi ◽  
Timo Saksala ◽  
Mikko Hokka ◽  
Veli-Tapani Kuokkala
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Mechanical Behavior ◽  
Thermal Shock ◽  
Dynamic Loading ◽  
Split Hopkinson Pressure Bar ◽  
Tensile Behavior ◽  
Brazilian Disc ◽  
Brazilian Disc Test ◽  
Plasma Shock

This paper presents a numerical and experimental study on the mechanical behavior of plasma shocked rock. The dynamic tensile behavior of plasma shock treated Balmoral Red granite was studied under dynamic loading using the Brazilian disc test and the Split Hopkinson Pressure Bar device. Different heat shocks were produced on the Brazilian disc samples by moving the plasma gun over the sample at different speeds. Microscopy clearly showed that as the duration of the thermal shock increases, the number of the surface cracks and their complexity increases (quantified here as the fractal dimension of the crack patterns) and the area of the damaged surface grows larger as well. At the highest thermal shock duration of 0.80 seconds the tensile strength of the Brazilian disc sample drops by approximately 20%. In the numerical simulations of the dynamic Brazilian disc test, this decrease in tensile strength was reproduced by modeling the plasma shock induced damage using the embedded discontinuity finite element method. The damage caused by the plasma shock was modeled by two methods, namely by pre-embedded discontinuity populations with zero strength and by assuming that the rock strength is lowered and conform to the Weibull distribution. This paper presents a quantitative assessment of the effects of the heat shock, the surface microstructure and mechanical behavior of the studied rock, and a promising numerical model to account for the pre-existing crack distributions in a rock material.

Experimental Study of the Dynamic Loading of Metal Disks

1983 ◽  
Vol 7 (8) ◽  
pp. 24-28 ◽  
Author(s):  
J.G. BEESE ◽  
H. CLARKE ◽  
P.W. PRICKETT
Keyword(s):  
Experimental Study ◽  
Dynamic Loading

scholarly journals Centrifugal experimental study of suction bucket foundations under dynamic loading

2007 ◽  
Vol 23 (6) ◽  
pp. 689-698 ◽  
Author(s):  
Xiaobing Lu ◽  
Yongren Wu ◽  
Bintian Jiao ◽  
Shuyun Wang
Keyword(s):  
Experimental Study ◽  
Dynamic Loading

An Experimental Study of Acid Exposed Fibre Reinforced Plastic Gratings

2011 ◽  
Author(s):  
Firoz Alam ◽  
Reza N. Jazar
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Service Life ◽  
Industrial Plants ◽  
Reinforced Plastics ◽  
Industrial Manufacturing ◽  
Reinforced Plastic ◽  
Fluosilicic Acid ◽  
Long Time ◽  
Adverse Environmental Conditions

Fibre Reinforced Plastics (FRPs) generally have greater advantages over conventional materials for their structural properties. However, the service life can significantly be shortened if the fibre reinforced plastics are exposed to adverse environmental conditions especially acid vapour, humidity and high temperature. In many chemical industrial plants in Australia and elsewhere fibre reinforced plastic gratings are used as structural components of stairs and passages where they are subjected to varying degrees of fluosilicic acid, a byproduct of the industrial manufacturing process. As currently no experimental data on the effects of fluosilicic acid on FRPs is available in the public domain, it is difficult to predict the service life of FRPs with some certainty. In order to understand the structural strength of fluosilicic acid exposed FRPs, an experimental study was undertaken. A series of specimens from various locations of a chemical plan in Australia were acquired and studied. Some new specimens (not exposed to acid, humidity and high temperature) were also studied to provide a benchmark for the comparison. The results indicated that the long time exposure to harsh environment and acid vapour can significantly deteriorate the flexural strength and service life of FRPs.

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