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

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.

Energy Transmission in Piping Systems and Its Relation to Noise Control

1972 ◽  
Vol 94 (2) ◽  
pp. 746-751 ◽  
Author(s):  
Pritchard H. White ◽  
Roger J. Sawley
Keyword(s):  
Noise Control ◽  
Vibrational Energy ◽  
Piping System ◽  
Acoustic Fields ◽  
Energy Transmission ◽  
Noise And Vibration ◽  
Energy Interaction ◽  
Process Plant ◽  
Piping Systems

The piping in a process plant acts as a distribution and radiation system throughout the plant for many significant sources of noise and vibration such as compressors, pumps, valves and other flow discontinuities, and the like. The acoustical and vibrational energy carried by the piping can result in the establishment of undesirable acoustic fields. This paper looks at those factors which are important to the proper description of the energy interaction and propagation in the fluid-filled piping system and discusses their significance in achieving noise control.

scholarly journals Vibration Characteristics and Power Flow Analyses of a Ship Propulsion Shafting System with General Support and Thrust Loading

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Deshui Xu ◽  
Jingtao Du ◽  
Chuan Tian
Keyword(s):  
Power Flow ◽  
Vibrational Energy ◽  
Numerical Study ◽  
Current Model ◽  
Flexural Vibration ◽  
Vibration Characteristics ◽  
Energy Transmission ◽  
Energy Principle ◽  
Vibration Displacement ◽  
Ship Propulsion

In this paper, flexural vibration and power flow transmission of a ship propulsion shafting structure are analyzed via energy principle description in conjunction with Rayleigh–Ritz procedure, in which the shafting vibration displacement is constructed as a superposition of Fourier series and boundary-smoothing supplementary functions. Effect of the distributed bearing support and thrust loading of propulsion shafting system is considered in terms of potential energy of system Lagrangian. Numerical examples are presented to demonstrate the reliability and effectiveness of the established model by comparing results with those from finite element method. Results show that the current model can deal with the vibration analysis of ship propulsion shafting with thrust loading and distributed bearing very well. Influence of boundary restraints, stiffness of distributed bearings, and thrust loading on vibration characteristics of ship shafting system is studied and addressed. Numerical study on power flow analysis is also conducted to investigate the characteristics of vibrational energy transmission in such practical structure. Results show that the stiffness of spatial bearing support has significant influence on vibrational energy transmission and thrust force will greatly affect the total input power into such structure.

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