Comparison of Time and Frequency Domain Source Path Contribution Analysis for Engine Noise Using a Noise and Vibration Engine Simulator

2008 ◽  
Author(s):  
David Bogema ◽  
Andreas Schuhmacher ◽  
Dimitri Tcherniak
Keyword(s):  
Frequency Domain ◽  
Engine Noise ◽  
Noise And Vibration ◽  
Contribution Analysis ◽  
Domain Source

No Breaks for Noise

1999 ◽  
Vol 121 (08) ◽  
pp. 62-63 ◽  
Author(s):  
Paul Sharke
Keyword(s):  
Brake System ◽  
Disc Brake ◽  
Brake Pedal ◽  
Passenger Compartment ◽  
Engine Noise ◽  
Master Cylinder ◽  
Noise And Vibration ◽  
Brake Pads ◽  
Mechanical Components ◽  
To Come

This article highlights the fact that engineers who design and test anti-lock brake systems (ABS) have been trying to come up with ways to minimize the noise and vibration that drivers hear and feel when they stomp on the brake pedals. The ABS engineers want drivers to do during a panic stop is to let their feet off the brakes. According to the engineers, braking should be the concern, because the less time the driver worries about stopping the car, the more time there is to concentrate on steering it. The mechanical components in both systems are functionally identical, consisting of a brake pedal, a master cylinder and booster, hydraulic lines and fluid, wheel calipers, brake pads, and rotors. In fact, unless the system is actuated by hard braking, ABS acts just like an ordinary disc brake system. Engine noise would only mask the ABS noise reaching the binaural head, which sits inside the passenger compartment where a driver would normally be.

Transient Free-Surface Hydrodynamics Using Rational Approximation of the Green’s Function

1999 ◽  
Vol 43 (02) ◽  
pp. 95-106 ◽  
Author(s):  
Christopher J. Damaren
Keyword(s):  
Free Surface ◽  
Frequency Domain ◽  
Source Function ◽  
The Body ◽  
Floating Body ◽  
Order Ordinary Differential Equation ◽  
Radiation Impedance ◽  
Rational Dependence ◽  
The Time Domain ◽  
Domain Source

Rational approximations in the frequency domain are developed for the source function of linear free-surface hydrodynamics using the recently uncovered fourth-order ordinary differential equation (ODE) satisfied by the time-domain source function. The radiation problem for a floating body in deep water is formulated using a source plus wave-free potential expansion for the fluid. The inherent rational dependence on frequency of the wave-free potentials as well as the source approximation are used to develop a system of constant-coefficient ODE's for the radiation impedance which can be used to develop the motion of the body in a simple manner. The technique is applied to the heaving motion of a floating sphere with good results. The application to more general body geometries is explored by formulating the frequency-domain problem using the variational principle of Chen and Mei and exploiting its polynomial dependence on frequency.

Time-Domain Source Contribution Analysis Method for In-Room Pass-By Noise

2011 ◽  
Author(s):  
Karl Janssens ◽  
Pieter Aarnoutse ◽  
Peter Gajdatsy ◽  
Laurent Britte ◽  
Filip Deblauwe ◽  
...  
Keyword(s):  
Time Domain ◽  
Analysis Method ◽  
Source Contribution ◽  
Contribution Analysis ◽  
Domain Source
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