Category Title
Acoustically-induced vibration (AIV) refers to high-frequency pipe wall vibration that is excited by an acoustic source. Typically, the source of this acoustic excitation is an upstream flow restriction such as a control valve, pressure safety valve (PSV), or restriction orifice that passes a high mass flow of process fluid with a large pressure drop. In some cases, particularly with thin walled, large diameter pipe, the resulting vibration levels are severe enough to cause high cycle fatigue damage and failure, usually at welded supports or branch connections. Due to the high response frequencies (typically 100-3000+ Hz), fatigue failures in some severe cases have been reported to occur within as little as several minutes of operation. Due to the complex multimodal acoustic and piping response, physics-based modeling of AIV stresses and associated mitigations is a significant technical challenge and model results should be validated with experimental data.
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