scholarly journals COMPARISON OF THE EFFECTIVENESS OF MINIMIZING COST FUNCTION PARAMETERS FOR ACTIVE CONTROL OF VIBRATIONAL ENERGY TRANSMISSION IN A LIGHTLY DAMPED STRUCTURE

2000 ◽  
Vol 237 (2) ◽  
pp. 223-244 ◽  
Author(s):  
D.K. ANTHONY ◽  
S.J. ELLIOTT
Keyword(s):  
Cost Function ◽  
Active Control ◽  
Vibrational Energy ◽  
Energy Transmission

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.

Statistical Energy Analysis on Vibrational Energy Transmission in Hard Disk Drive Components

2013 ◽  
Author(s):  
Nopdanai Ajavakom ◽  
Pinporn Tanthanasirikul
Keyword(s):  
Energy Analysis ◽  
Vibrational Energy ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Statistical Energy Analysis ◽  
Energy Transmission ◽  
Vibration Tests ◽  
Main Components ◽  
Loss Factors

One of the problems found in the 2.5-inch hard disk drives (HDD) in operation is its vibration. Aiming to find important information to help reduce the vibration transmitted to the outer shell of HDD, the parameters involving vibrational energy transmission among the main components of HDD are identified by the test-based Statistical Energy Analysis (SEA). First, the vibration tests of HDD in the idle mode are performed in order to identify the contribution of the main components; the platters and the top cover, to the overall vibration of HDD. Second, the SEA parameters including the dissipation loss factors of the components and coupling loss factors of the pairs of the components are then experimentally determined in order to calculate the vibration transmission power among the components.

Vibrational‐Energy Transmission in a Three‐Element Structure

1965 ◽  
Vol 38 (2) ◽  
pp. 253-261 ◽  
Author(s):  
Richard H. Lyon ◽  
Terry D. Scharton
Keyword(s):  
Vibrational Energy ◽  
Energy Transmission

Power Transmission from a Vibrating Source through an Intermediate Flexible Panel to a Flexible Cylinder

1994 ◽  
Vol 116 (4) ◽  
pp. 496-505 ◽  
Author(s):  
Jiaqiang Pan ◽  
C. H. Hansen
Keyword(s):  
Rigid Body ◽  
Cost Function ◽  
Active Control ◽  
Power Transmission ◽  
Flexible Cylinder ◽  
Simply Supported ◽  
Flexible Panel ◽  
Isolation Systems ◽  
The Cost ◽  
Supporting Structures

When active control is used to reduce the vibration transmission through machine isolators into supporting structures, the vibratory power transmission through the isolators is often used as the cost function to be minimized. To apply active control effectively to machine isolation systems, it is necessary to investigate the nature of the vibratory power transmission from a vibrating machine to its supporting structure through the isolators. In this study the reduction of vibratory power transmission from a vibrating rigid body into a flexible simply supported cylinder through a flexible, completely free intermediate panel and multiple connected isolators is investigated theoretically and numerically. The system studied in this paper can be taken as a simplified dynamical model of equipment mounting configurations in submarines.

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