Sound focused personal audio system design: Performance improvement in acoustic contrast control by spatial weighting for obtaining spatially averaged acoustic potential energy

2008 ◽  
Vol 123 (5) ◽  
pp. 3652-3652
Author(s):  
Jin‐Young Park ◽  
Ji‐Ho Chang ◽  
Chan‐Hui Lee ◽  
Yang‐Hann Kim
Keyword(s):  
Potential Energy ◽  
System Design ◽  
Performance Improvement ◽  
Design Performance ◽  
Audio System

Design and off-design performance improvement of a radial-inflow turbine for ORC applications using metamodels and genetic algorithm optimization

2021 ◽  
Vol 183 ◽  
pp. 116197
Author(s):  
Angie L. Espinosa Sarmiento ◽  
Ramiro G. Ramirez Camacho ◽  
Waldir de Oliveira ◽  
Elkin I. Gutiérrez Velásquez ◽  
Manohar Murthi ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Performance Improvement ◽  
Algorithm Optimization ◽  
Genetic Algorithm Optimization ◽  
Design Performance ◽  
Radial Inflow Turbine

PARAMETER ANALYSIS IN ACOUSTIC CONTRAST CONTROL DESIGN SCHEME FOR A LOUDSPEAKER ARRAY

2012 ◽  
Vol 20 (04) ◽  
pp. 1250016 ◽  
Author(s):  
BO-HSIEN WU ◽  
GEE-PINN TOO
Keyword(s):  
Energy Density ◽  
Potential Energy ◽  
Sound Field ◽  
Parameter Analysis ◽  
Emission Frequency ◽  
Dark Zone ◽  
Parameters Analysis ◽  
Simulation Parameters ◽  
Source Array ◽  
Audio System

The concept of acoustic contrast control divides a sound field into bright zone and dark zone. A source array is used to increase acoustic potential energy density in the bright zone and to decrease acoustic potential energy density in the dark zone by controlling amplitude and phase of each source. In the present study, a personal audio system which is based on acoustic contrast control is designed. The purpose is to focus the acoustic potential energy around the region of listener. The optimal configuration for sound field is controlled by using a loudspeaker array. Parameters analysis is considered in simulation. Parameters, such as: the quantity of loudspeakers, the spacing of loudspeakers, the length of array, and the emission frequency are discussed. Finally, two experiments are conducted in a semi-anechoic room and a reverberation room, respectively. The results are shown to verify this approach in the present study.

scholarly journals A New Mechanism for Soft Landing in Robotic Space Exploration

Robotics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 103 ◽  
Author(s):  
Stefano Seriani
Keyword(s):  
Solar System ◽  
Kinetic Energy ◽  
Potential Energy ◽  
System Design ◽  
Dynamic Models ◽  
Space Exploration ◽  
Reactive Force ◽  
Soft Landing ◽  
Theoretical Limit ◽  
Robotic Space Exploration

Landing safely is the key to successful exploration of the solar system; the mitigation of the connected effects of collision in mechanical systems relies on the conversion of kinetic energy into heat or potential energy. An effective landing-system design should minimize the acceleration acting on the payload. In this paper, we focus on the application of a special class of nonlinear preloaded mechanisms, which take advantage of a variable radius drum (VRD) to produce a constant reactive force during deceleration. Static and dynamic models of the mechanism are presented. Numerical results show that the system allows for very efficient kinetic energy accumulation during impact, approaching the theoretical limit.

scholarly journals Design performance requirements and failure analysis of oxygen system on civil aircraft

2021 ◽  
Vol 233 ◽  
pp. 01076
Author(s):  
Jian Wang
Keyword(s):  
Failure Analysis ◽  
System Design ◽  
Design Theory ◽  
Basic Design ◽  
Design Performance ◽  
Performance Requirements ◽  
Oxygen System ◽  
Civil Aircraft ◽  
Test Flight ◽  
Important System

As an important system for maintaining the respiration and safety of people on board, the oxygen system is widely used in modern civil aircraft. This paper provides a complete overview of the system design performance requirements, starting from the basic design theory of the civil aircraft oxygen system. It also analyzes the failure causes of the oxygen system from the perspective of test flight and operation, and provides some references for the analysis of the failure of the civil aircraft oxygen system and the debugging methods.

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