Experimental noise and vibration analysis in an aircraft simplified hydraulic systems

2021 ◽  
Author(s):  
T. A. Fiorentin ◽  
G. G. Silva
Keyword(s):  
Vibration Analysis ◽  
Hydraulic Systems ◽  
Noise And Vibration ◽  
Experimental Noise

The Use of Noise and Vibration Analysis on the Hydraulic Networks

1991 ◽  
Author(s):  
P. A. Drakatos ◽  
S. P. Drakatos
Keyword(s):  
Vibration Analysis ◽  
Noise And Vibration ◽  
Hydraulic Networks

Abstract This paper is concerned with Analysis of Vibration and Noise in a hydraulic networks. In the analysis it is tried to find the discrete frequencies. So, we are able to recognize the damages or to redesign the system. The most important effectiveness on the system ought to the flow in the phase of vorticity.

Optimizing Distributed-Contact Friction in Ring Dampers

2005 ◽  
Author(s):  
X. W. Tangpong ◽  
J. A. Wickert ◽  
A. Akay ◽  
Yuri Karpenko
Keyword(s):  
Energy Dissipation ◽  
Vibration Analysis ◽  
Excitation Frequency ◽  
Contact Friction ◽  
Friction Damping ◽  
End Effects ◽  
Noise And Vibration ◽  
Disk Brake ◽  
Brake Rotors ◽  
Base Structure

This paper describes the vibration analysis and optimization of a base structure and a beam-like attached damper sub-system that couple in vibration through distributed-contact friction damping. The objective is to tune the characteristics of the damper sub-system to maximize energy dissipation, and therefore to control vibration of the base structure. Applications of the concept to noise and vibration phenomena associated with automotive disk brake rotors are discussed. Per-cycle energy dissipation is examined as a function of damper preload for two classes of sub-systems: dampers that are split rings, and dampers that are continuous rings. End-effects and the manner in which energy dissipation is distributed spatially along the damper are also discussed. Of potential technological application, for a given excitation frequency, the damper sub-system’s design can be optimized to reduce vibration of the base structure.

Application of Predictive Noise and Vibration Analysis to the Development of a New-Generation Lightweight 3-Liter V6 Nissan Engine

1994 ◽  
Author(s):  
Katsuto Yamanouchi ◽  
Kikuo Yamashita ◽  
Naohisa Mamiya ◽  
Tatsuo Yamazaki ◽  
Ichiro Yamazaki
Keyword(s):  
Vibration Analysis ◽  
Noise And Vibration ◽  
New Generation

scholarly journals What's that Noise?

2011 ◽  
Vol 133 (10) ◽  
pp. 44-45
Author(s):  
Lynn Manning
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Automotive Industry ◽  
Vibration Analysis ◽  
Instrument Panel ◽  
Analysis Method ◽  
Element Analysis ◽  
Noise And Vibration ◽  
To Come ◽  
Testing Company

This article focuses on various features of a finite element analysis (FEA) program designed by IDIADA, a Barcelona-based company providing design, engineering, testing, and homologation services to the automotive industry. The program has been designed as a solution to the problem of squeaks and rattles in an automobile. FEA software used by engineers from automotive testing company IDIADA detects potential automotive noise. The company uses Abaqus Unified Finite Element Analysis from Dassault Systèmes’ brand Simulia. The team delivered a paper at the Simulia Customer Conference in Barcelona in May 2011 to present the latest improvements in their methodology, applied to rattle in a car instrument panel and correlated with real-world testing. Research has shown that a standard noise-and-vibration analysis method alone can’t model, or predict, the contact that will result in a rattle. The engineers need to come up with a simulation that can accommodate both frequency for noise and vibration and contact for squeak and rattle.

A method to reduce noise in hydraulic systems by optimizing pipe clamp locations

1998 ◽  
Vol 212 (4) ◽  
pp. 267-280 ◽  
Author(s):  
A H M Kwong ◽  
K A Edge
Keyword(s):  
Genetic Algorithms ◽  
Fluid Flow ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Experimental Studies ◽  
Hydraulic Systems ◽  
Hydraulic Circuit ◽  
Noise And Vibration ◽  
Novel Technique ◽  
Supporting Structures

This paper describes a novel technique to reduce noise and vibration in hydraulic systems. The approach involves finding the best hydraulic circuit mounting locations to avoid excessive coupling between the hydraulic pipes and the supporting structures. Using a well-developed transfer matrix method, the dynamic response to disturbance by fluid flow ripples can be predicted at all pipe locations. By making appropriate assumptions concerning the mounting impedance, the force and displacement parameters involved in clamping the pipes can be estimated. These results can be used to quantify the fitness of the hydraulic circuit in an optimization program using genetic algorithms. An example is included using a simple hydraulic rig. The predicted results for the best and worst clamping locations are compared. Experimental studies have confirmed that, with the optimal clamping locations, significant reductions in both noise and vibration were obtained.

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