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casestudy - Exhaust Noise Vibration System-level structure...

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Exhaust Noise & Vibration System-level structure borne vibration problem Loud noise in rear passenger seat at cruising speed is believed to be due to exhaust resonance. Neon RT exhaust test bed as an example of a complex system-level N&V problem
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An increase in the spring rate of the Neon suspension introduces a system-level noise problem in the 300-350 Hz frequency range. - Why does a change in the suspension subsystem create a vibration problem in the exhaust subsystem in the first place? - How and why does a stiffness change in the exhaust system inlet pipe affect the vibration problem? Exhaust Noise & Vibration Contradictions in diagnosing the problem
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An increase in the spring rate of the vehicle suspension subsystem causes the exhaust subsystem resonances to shift upward due to perturbed boundary condition. Certain modes are affected by increase in suspension stiffness, K2 Increase in K2 Exhaust Noise & Vibration Simplified model
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Electro-dynamic 50-lb skewed shaker excitation at bellows
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