Study on Sound Generating Mechanism Using Vibrational Energy and Sound Energy. 3rd Report. Proposal of Energy Transformation Efficiency of Rectangular Plate from Vibration to Sound.

1996 ◽  
Vol 62 (604) ◽  
pp. 4520-4527
Author(s):  
Noritoshi NAKAGAWA ◽  
Akihiko HIGASHI ◽  
Yasuhisa SEKIGUCHI
Keyword(s):  
Rectangular Plate ◽  
Vibrational Energy ◽  
Transformation Efficiency ◽  
Energy Transformation ◽  
Sound Energy

Estimation of vibrational energy flow by sound energy in a vibrating rectangular plate

1996 ◽  
Vol 100 (4) ◽  
pp. 2596-2596
Author(s):  
Noritoshi Nakagawa ◽  
Akihiko Higashi ◽  
Yasuhisa Sekiguchi
Keyword(s):  
Rectangular Plate ◽  
Energy Flow ◽  
Vibrational Energy ◽  
Sound Energy ◽  
Vibrational Energy Flow

Gyroscopic Effects of a Vibrationally Isolated Rotating Disk and Shaft

1997 ◽  
Author(s):  
Donald L. Margolis
Keyword(s):  
Vibrational Energy ◽  
Rotating Disk ◽  
Aircraft Engine ◽  
Energy Transmission ◽  
Sound Energy ◽  
Supporting Structure ◽  
Rotating Machine ◽  
Established Fact ◽  
Radiated Sound ◽  
Gyroscopic Effects

Abstract An aircraft engine is an example of a rotating machine whose rotating imbalance will be transmitted as vibrational energy into the structure to which it is attached. There is considerable interest in understanding this energy transmission in order to design mounting systems, both passive and active, which can control this transmission the best possible way in order to reduce structurally borne noise in the cabin. It is a well established fact in acoustics[1] that in order to reduce perceived sound at the listener, the noise transmission path must be severed by 1) eliminating the source of the disturbance (usually difficult if not impossible), 2) preventing propagation of energy into the structure and ultimately to structural surfaces, 3) preventing radiation of sound energy from vibrating surfaces, and 4) preventing radiated sound from reaching the listener. In this paper we address only the prevention of energy transmission from the source into the supporting structure through use of some type of mounting system.

Energy Storage and Deposition Characteristics of Spark Ignition System

2011 ◽  
Vol 383-390 ◽  
pp. 1647-1652 ◽  
Author(s):  
Dao Jing Wang ◽  
Hong Guang Zhang ◽  
Xiao Na Sun ◽  
Dao Jing Wang
Keyword(s):  
Transformation Efficiency ◽  
Primary Energy ◽  
Test Results ◽  
Energy Transformation ◽  
Secondary Circuit ◽  
Time Resolved ◽  
Ambient Temperatures ◽  
Voltage Signal ◽  
Primary Current ◽  
Spark Energy

Time-resolved current and voltage measurements for an inductive automotive spark system were made. The measurements were made in air for a range of charge time from 1-8ms, at ambient temperatures. Primary current was measured, so the primary energy can be calculated. Current and voltage signal of secondary circuit was detected, from which the spark energy and energy transformation efficiency can be calculated. Test results show that: when the charge time is 6ms, both the primary energy and spark energy reaches to saturation value, does not advanced any more with the charge time increasing; and the energy transformation efficiency is at an appropriate range.

scholarly journals RESEARCH OF THE ELECTRIC SCOOTER DRIVE ENERGY TRANSFORMATION EFFICIENCY DEPENDING ON POWER SUPPLY AND LOAD

2017 ◽  
Vol 0 (3) ◽  
pp. 51-55
Author(s):  
Mykola Yakovych Ostroverkhov ◽  
Mykola Oleksandrovych Reutskyi ◽  
Danylo Yaroslavovych Trinchuk
Keyword(s):  
Power Supply ◽  
Transformation Efficiency ◽  
Energy Transformation ◽  
Electric Scooter

The Effect of Stapedectomy on the Loudness of One’s Own Voice

1965 ◽  
Vol 8 (3) ◽  
pp. 223-234 ◽  
Author(s):  
William Melnick
Keyword(s):  
Middle Ear ◽  
Normal Subjects ◽  
Sound Energy ◽  
Loudness Function ◽  
Before And After ◽  
Increased Sensitivity

Five subjects with normal middle ear mechanisms, and otosclerotic patients, before and after stapedectomy, matched the loudness of their voices to the loudness of a 125-cps-sawtooth noise. The results showed loudness matching functions with gradual slopes, less than 1.00, for the normal subjects and the patients prior to stapedectomy. Post-surgically, the loudness function for the patients increased in steepness to considerably more than 1.00. These results are explained, most logically, in terms of increased sensitivity of the altered middle ear to sound energy generated by the listener’s own voice.

Scattering from a Thin Rectangular Plate at Glancing Incidence

2001 ◽  
Vol 21 (2) ◽  
pp. 147-163 ◽  
Author(s):  
Hirohide Serizawa ◽  
Kohei Hongo ◽  
Hirokazu Kobayashi
Keyword(s):  
Rectangular Plate ◽  
Thin Rectangular Plate

Simply supported FPEDs connected by springs for broadband energy harvesting

2020 ◽  
Vol 64 (1-4) ◽  
pp. 201-210
Author(s):  
Yoshikazu Tanaka ◽  
Satoru Odake ◽  
Jun Miyake ◽  
Hidemi Mutsuda ◽  
Atanas A. Popov ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Evaluation Method ◽  
Energy Harvester ◽  
Vibrational Energy ◽  
Functional Materials ◽  
Vibration Energy ◽  
Theoretical Evaluation ◽  
Vibration Energy Harvester ◽  
Polyvinylidene Difluoride ◽  
Simply Supported

Energy harvesting methods that use functional materials have attracted interest because they can take advantage of an abundant but underutilized energy source. Most vibration energy harvester designs operate most effectively around their resonant frequency. However, in practice, the frequency band for ambient vibrational energy is typically broad. The development of technologies for broadband energy harvesting is therefore desirable. The authors previously proposed an energy harvester, called a flexible piezoelectric device (FPED), that consists of a piezoelectric film (polyvinylidene difluoride) and a soft material, such as silicon rubber or polyethylene terephthalate. The authors also proposed a system based on FPEDs for broadband energy harvesting. The system consisted of cantilevered FPEDs, with each FPED connected via a spring. Simply supported FPEDs also have potential for broadband energy harvesting, and here, a theoretical evaluation method is proposed for such a system. Experiments are conducted to validate the derived model.

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