scholarly journals The influence of structural-acoustic coupling on the dynamic behaviour of a one- dimensional vibro-acoustic system

2009 ◽  
Vol 126 (6) ◽  
pp. 3373-3373
Author(s):  
Gihwan Kim
Keyword(s):  
Dynamic Behaviour ◽  
Acoustic System ◽  
One Dimensional ◽  
Acoustic Coupling

Numerical Simulation of Thermal and Fluid-Dynamic Behaviour of Reciprocating Compressor

2000 ◽  
Author(s):  
Zhilong He ◽  
Xueyuan Peng ◽  
Pengcheng Shu
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Balance ◽  
Dynamic Behaviour ◽  
Fluid Dynamic ◽  
Reciprocating Compressor ◽  
One Dimensional ◽  
Compressor Design ◽  
Suction Line ◽  
Hermetic Compressor

Abstract This paper presents a numerical method for simulating the thermal and fluid-dynamic behavior of hermetic compressors in the whole compressor domain. The model of fluid flow is developed by integrating transient one-dimensional conservation equations of continuity, momentum and energy through all of the elements from suction line to discharge line. The model describing thermal behavior is based on heat balance in the components such as muffler, connecting tubes and orifices. The calculation of the thermodynamic and transport properties for different refrigerants at various conditions has been considered, and some numerical results for a hermetic compressor are presented. The present study has demonstrated that the numerical simulation is a fest and reliable tool for compressor design.

Hexaphosphaferrocene [Fe(η5-P3C2tBu2)2] as a Connecting Moiety in Oligomeric and Polymeric Compounds

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1429-1437 ◽  
Author(s):  
Andrea Schindler ◽  
Manfred Zabel ◽  
John F. Nixon ◽  
Manfred Scheer
Keyword(s):  
Dynamic Behaviour ◽  
Stoichiometric Ratio ◽  
Ladder Structure ◽  
Polymeric Compound ◽  
One Dimensional ◽  
Polymeric Compounds

The hexaphosphaferrocene complex [Fe(η5-P3C2tBu2)2] (1) derived from the corresponding 1,2,4-triphosphospholyl anion reacts with CuX (X = Cl, Br, I) in a 1 : 1 stoichiometry to give the isostructural, one-dimensional polymeric compounds [{Cu(μ3-X)}4{Fe(μ,η5:η1-P3C2tBu2)2}2]n (X = Cl (2), Br (3), I (4)), which display a unique sinusoidal (CuX)n ladder structure. In the reaction with CuI a second one-dimensional polymeric compound [{Cu3(μ-I)(μ3-I)2}(CH3CN){Fe(μ,η5:η1- P3C2tBu2)(μ3,η5:η1-P3C2tBu2)}]n (5) is formed. The reaction of 1 with CuX (X= Cl, Br, I) in a 1 : 2 stoichiometric ratio leads only in the case of CuCl to the formation of the new, oligomeric compound [{Cu(μ3-Cl)}4(CH3CN)2{Fe(μ,η5:η1-P3C2tBu2)2}2] (6), whereas in the case of CuBr and CuI the polymeric compounds 3 and 5 were isolated. The reaction of 1 with Ag[Al{OC(CF3)3}4] in a 1:1 stoichiometric ratio results in the formation of [Ag{Fe(μ,η5:η1-P3C2tBu2)2}2][Al{OC(CF3)3}4] (7), which shows dynamic behaviour in solution

Study of Acoustic System Characteristics of Ultrasonic Machining Based on Similarity Principle

2012 ◽  
Vol 565 ◽  
pp. 639-643
Author(s):  
Ping Yan Bian ◽  
Bo Zhao ◽  
Zhe Liu
Keyword(s):  
Significant Influence ◽  
Ultrasonic Machining ◽  
Acoustic System ◽  
Vibration System ◽  
One Dimensional ◽  
System Parameters ◽  
Similarity Principle ◽  
Load Mode ◽  
System Characteristics ◽  
Cutting Modes

Based on similarity principle, cutting modes of turning, milling, grinding etc are equivalent to three load forms of dot, line and face. And three different loads of dot, line and face are applied on the nano-ZrO2 workpiece by three different indenter models of dot, line and face. To one-dimensional ultrasonic vibration system, the influence is studied which is of different load forms and different load magnitudes on acoustic system characteristics of ultrasonic machining. The experimental results show that, the change of loads has little influence on the acoustic system parameters of ultrasonic machining when the load modes on the nano-ZrO2 workpiece are dot and line. And when the load mode is surface contact, the change of loads has significant influence on the acoustic system parameters of ultrasonic machining.

Theoretical Foucault Images of Superconducting Fluxons

1997 ◽  
Vol 3 (S2) ◽  
pp. 509-510
Author(s):  
M. Beleggia ◽  
G. Pozzi ◽  
K. Harada ◽  
H. Kasai ◽  
T. Matsuda ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Dynamic Behaviour ◽  
Structural Defects ◽  
Experimental Conditions ◽  
Transmitted Beam ◽  
Factors Affecting ◽  
One Dimensional ◽  
Flux Lines ◽  
Main Disadvantage ◽  
Individual Flux

Individual flux lines in superconducting specimens have been recently observed using a 300kV holography electron microscope equipped with a cold field emission gun in the transmission mode by means of the out-of-focus method. In this way it has been possible to observe the dynamic behaviour of fluxons depending upon the variations of the temperature and/or the applied magnetic field or current. The main disadvantage of this method is that correlation with structural defects is troublesome owing to the large defocus distance (of the order of 1 cm for conventional superconductors) necessary for the detection of flux lines.This drawback is not present in the Foucault technique, where the contrast is generated in the focused image by masking part of the transmitted beam by means of an aperture. Therefore, some preliminary calculations have been made recently using one-dimensional models, which allow for a quick and easy simulation of the factors affecting the experimental conditions .

Broadband modulation of subwavelength topological interface states in a one-dimensional acoustic system

2020 ◽  
Vol 116 (1) ◽  
pp. 013102 ◽  
Author(s):  
Zhenyu Wang ◽  
Degang Zhao ◽  
Jinlong Luo ◽  
Rongli Wang ◽  
Hai Yang
Keyword(s):  
Interface States ◽  
Acoustic System ◽  
One Dimensional ◽  
Broadband Modulation

scholarly journals Stability Boundaries in Laterally-Coupled Pairs of Semiconductor Lasers

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 74
Author(s):  
Martin Vaughan ◽  
Hadi Susanto ◽  
Nianqiang Li ◽  
Ian Henning ◽  
Mike Adams
Keyword(s):  
Semiconductor Lasers ◽  
Normal Mode ◽  
Dynamic Behaviour ◽  
Normal Modes ◽  
Stability Boundaries ◽  
Pumping Rate ◽  
One Dimensional ◽  
Coupled Mode ◽  
Normal Mode Theory ◽  
Laser Separation

The dynamic behaviour of coupled pairs of semiconductor lasers is studied using normal-mode theory, applied to one-dimensional (slab) and two-dimensional (circular cylindrical) real index confined structures. It is shown that regions of stable behaviour depend not only on pumping rate and laser separation, but also on the degree of guidance in the structures. Comparison of results between normal-mode and coupled-mode theories for these structures leads to the tentative conclusion that the accuracy of the latter is determined by the strength of self-overlap and cross-overlap of the symmetric and antisymmetric normal modes in the two lasers.

Dynamic behaviour of automotive catalytic converters subjected to variations in engine exhaust compositions

2005 ◽  
Vol 6 (6) ◽  
pp. 557-567 ◽  
Author(s):  
T Shamim
Keyword(s):  
Dynamic Behaviour ◽  
Single Channel ◽  
Catalytic Converter ◽  
Computational Investigation ◽  
Engine Exhaust ◽  
One Dimensional ◽  
Transient Behaviour ◽  
Fundamental Understanding ◽  
Automotive Catalytic Converters ◽  
Harmful Effects

This paper presents a computational investigation of the effect of composition modulations on an automotive catalytic converter. The objective is to develop a better fundamental understanding of the converte's performance under actual driving conditions. Such an understanding will be beneficial in devising improved emission control methodologies by exploiting the catalyst transient behaviour. The study employs a single-channel-based, one-dimensional, non-adiabatic model. Two types of imposed transients (sinusoidal and step changes) are considered. The results show that composition modulations cause a significant departure in the catalyst behaviour from its steady behaviour, and modulations have both favourable and harmful effects on pollutant conversion.

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