Experimental Study on Mechanical Energy Hysteresis in Nano Colloidal Damper Using Porous Silica Particle

2007 ◽  
pp. 925-930
Author(s):  
Sang Bae Jeon ◽  
Tae Wan Ku ◽  
Jeong Kim ◽  
Beom Soo Kang
Keyword(s):  
Experimental Study ◽  
Silica Particle ◽  
Mechanical Energy ◽  
Porous Silica

Experimental Study on Mechanical Energy Hysteresis in Nano Colloidal Damper Using Porous Silica Particle

2007 ◽  
Vol 340-341 ◽  
pp. 925-930
Author(s):  
Sang Bae Jeon ◽  
Tae Wan Ku ◽  
Jeong Kim ◽  
Beom Soo Kang
Keyword(s):  
Silica Particle ◽  
Mechanical Energy ◽  
Colloidal Suspension ◽  
Porous Silica ◽  
Porous Matrix ◽  
Water Volume ◽  
Test Rig ◽  
Hydraulic Damper ◽  
Industrial Structures ◽  
Damping Systems

Mechanical damping systems have been widely used to various industrial structures and are mainly hydraulic and pneumatic devices nowadays. This article presents an experimental investigation of a nano colloidal damper. Particularly for colloidal damper, the hydraulic oil is replaced by a colloidal suspension, which is consisted from a nano-porous matrix with controlled architecture and a lyophobic fluid. Nano colloidal damper test rig and the measuring technique of the hysteresis were described in this study. Influence of the water volume and particle diameters upon the nano colloidal damper hysteresis was investigated. As a result, the proposed nano colloidal damper (NCD) is proved as an effective one, which can be replaced for the conventional hydraulic damper.

Experimental study of D/H isotopic fractionation factor of water adsorbed on porous silica tubes

2007 ◽  
Vol 71 (5) ◽  
pp. 1159-1169 ◽  
Author(s):  
Thierry Richard ◽  
Lionel Mercury ◽  
Marc Massault ◽  
Jean-Luc Michelot
Keyword(s):  
Experimental Study ◽  
Porous Silica ◽  
Isotopic Fractionation ◽  
Fractionation Factor ◽  
Isotopic Fractionation Factor

Total mechanical energy of a ventricle model and cardiac oxygen consumption

1979 ◽  
Vol 236 (3) ◽  
pp. H498-H505 ◽  
Author(s):  
H. Suga
Keyword(s):  
Experimental Study ◽  
Regression Analysis ◽  
Oxygen Consumption ◽  
Left Ventricle ◽  
Empirical Equation ◽  
Mechanical Energy ◽  
Linear Regression Analysis ◽  
Stroke Work ◽  
Time Varying ◽  
Total Mechanical Energy

Mechanical energy (ENG) required by a time-varying elastance model of the ventricle was compared with oxygen consumption per beat (VO2) of the canine left ventricle contracting under a variety of loading conditions. ENG needed for this model to increase its elastance during systole is shown to be equal to the sum of the potential energy built in the elastance during systole plus the external mechanical stroke work. This ENG is equivalent to the area (PVA) bounded by the end-systolic and end-diastolic P-V curves and the systolic limb of the P-V loop trajectory in the P-V plane. There was a high correlation (r = 0.89) between VO2s documented in the literature and PVAs assessed by the author from the accompanying P-V data from both isovolumic and ejecting contractions in 11 hearts. A linear regression analysis yielded an empirical equation: VO2 (ml O2/beat) = a . PVA (mmHg . ml/beat) + b, where a = 1.37 X 10(-5) and b = 0.027, which can be used to predict VO2 from PVA. A preliminary experimental study in my laboratory confirmed the validity of this empirical equation.

Experimental Study on Damping Characteristics of Piezoceramic Materials Shunted by Passive Electrical Circuits

2007 ◽  
Vol 280-283 ◽  
pp. 267-270 ◽  
Author(s):  
Shao Ze Yan ◽  
Fu Xing Zhang ◽  
Yang Min Li
Keyword(s):  
Experimental Study ◽  
Material Properties ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Electric Energy ◽  
Electrical Circuits ◽  
Damping Characteristics ◽  
Different Types ◽  
Set Up

Piezoelectric materials have an ability to efficiently transform mechanical energy to electric energy and vice versa, which makes them useful as structural dampers. The objective of this work is to investigate the damping capabilities of a piezoceramic shunted by different types of passive electrical circuits. The material properties of the shunted piezoceramic are modeled and the analytical results show that the shunted piezoceramic exhibits different damping potentials depending on the piezoelectric properties of the material and the shunt circuits. An experimental set-up of a cantilever beam with surface bonded piezoceramics is proposed to investigate the damping characteristics of the shunted piezoceramic. An analytical model is developed to describe the influence of the shunted piezoceramic on the dynamic response of the beam. The damping performances of the piezoceramic shunted by different circuits are compared respectively and the experimental results show approximate agreement with the numerical simulations of the model.

Experimental Study of the Minto Engine—A Heat Engine for Converting Low Grade Heat to Mechanical Energy

2004 ◽  
Vol 126 (1) ◽  
pp. 661-667 ◽  
Author(s):  
Terence I. Quickenden ◽  
Kathryn M. Hindmarsh ◽  
Kean-Guan Teoh
Keyword(s):  
Experimental Study ◽  
Mechanical Energy ◽  
Heat Engine ◽  
Heat Energy ◽  
Working Fluid ◽  
Low Grade ◽  
Long Period ◽  
Short Period ◽  
Low Grade Heat ◽  
Liquid Piston

The Minto engine is a liquid piston heat engine that converts heat energy into mechanical energy. Evaporation of the heated, volatile working fluid pushes it upwards against gravity. This causes the device to tip over and rotate. A 500 mm diameter Minto engine which used petroleum ether as the working fluid, was built and was operated between 344 K and 294 K. Thermal efficiencies of up to 0.25% (i.e. 1.7% of the Carnot maximum) were measured. This engine behaves as a power amplifier. It absorbs low grade heat over a long period of time and suddenly releases it as a pulse of mechanical energy over a short period of time.

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