Effect of external sound superimposed on the self-excited oscillation in loop-tube thermoacoustic system

2021 ◽  
Author(s):  
Koto Hiramatsu ◽  
Shin-ichi SAKAMOTO ◽  
Yoshiaki Watanabe
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Particle Velocity ◽  
Sound Field ◽  
Energy Conversion Efficiency ◽  
Input Power ◽  
The Self ◽  
Straight Tube ◽  
Excited Oscillation ◽  
Tube Type

Abstract The influence of application of external sound to loop-tube type thermoacoustic system on the energy conversion efficiency is experimentally examined. The investigation is carried out by paying attention on the effect of loudspeaker (SP) set as external sound source. As a result, it is found that the setting of SP affects the sound field in the system and the amount of energy generation increases or decreases. The increasing or decreasing effect differs depending on the setting position of SP. Furthermore, it is confirmed that, provided SP is set near the node of particle velocity, the sound energy can be increased by more than the input power to SP, without changing the sound field in the tube. From these results it can be confirmed that, similar to straight-tube type thermoacoustic system, the energy conversion efficiency can be enhanced by setting SP at suitable position even in loop-tube type without end surfaces.

Influence characteristics of electrical parameters and vibration isolation properties of the stretcher system based on parallel mechanism and self-powered magneto-rheological damper

2019 ◽  
Vol 26 (7-8) ◽  
pp. 552-564
Author(s):  
Xiang Gao ◽  
Junchuan Niu ◽  
Zhihui Liu ◽  
Guodong Shen
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Parallel Mechanism ◽  
Vibration Isolation ◽  
Passive Control ◽  
Energy Conversion Efficiency ◽  
The Self ◽  
Electrical Parameters ◽  
Self Powered ◽  
Magneto Rheological

For reducing multidimensional vibrations endured by supine patients on ambulances, a new ambulance stretcher composed of parallel mechanism and self-powered magneto-rheological damper is introduced. The main thrust of this work is to investigate the vibration isolation capability and energy conversion efficiency of the proposed stretcher with changes in electrical parameters. First, the kinematic and dynamic equations are deduced by geometry and Lagrange approach, respectively. Subsequently, the circuit model of self-powered magneto-rheological damper is created. The frequency response function is derived by Kirchhoff’s law, which indicates the electrical power utilization rate. Then, the vibration isolation capability of the self-powered stretcher system is analyzed with changes in electrical parameters. Compared with passive control, the vibration isolation capability of the self-powered stretcher is improved significantly in horizontal, longitudinal, vertical, and pitch directions. The first two resonance peaks of displacement response are insensitive to changes in electrical parameters in all directions. Last, the energy conversion efficiency of the self-powered stretcher is discussed. Decreasing resistance and inductance could improve energy conversion efficiency significantly.

Influence of local inner diameter changes on the onset temperature and the energy conversion efficiency of a loop-tube-type thermoacoustic system

2018 ◽  
Vol 57 (7S1) ◽  
pp. 07LE01
Author(s):  
Kenshiro Inui ◽  
Shin-ichi Sakamoto ◽  
Yuichiro Orino ◽  
Kohei Egawa ◽  
Takahiro Wada ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Onset Temperature ◽  
Tube Type ◽  
Inner Diameter

First-principles study on the electronic and optical properties of the orthorhombic CsPbBr3 and CsPbI3 with Cmcm space group

2021 ◽  
Author(s):  
Xianhao Zhao ◽  
Tianyu Tang ◽  
Quan Xie ◽  
like gao ◽  
Limin Lu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
First Principles ◽  
Energy Conversion Efficiency ◽  
Space Group ◽  
Absorbing Materials ◽  
Halide Perovskites ◽  
Lead Halide

The cesium lead halide perovskites are regarded as effective candidates for light-absorbing materials in solar cells, which have shown excellent performances in experiments such as promising energy conversion efficiency. In...

Metal-like electrical conductivity in LaxSr2−xTiMoO6 oxides for high temperature thermoelectric power generation

2017 ◽  
Vol 46 (18) ◽  
pp. 5872-5879 ◽  
Author(s):  
Mandvi Saxena ◽  
Tanmoy Maiti
Keyword(s):  
Power Generation ◽  
Electrical Conductivity ◽  
High Temperature ◽  
Energy Conversion ◽  
Thermoelectric Power ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Power Generators ◽  
Thermoelectric Power Generation

Increasing electrical conductivity in oxides, which are inherently insulators, can be a potential route in developing oxide-based thermoelectric power generators with higher energy conversion efficiency.

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