Acoustic-Induced Vibration or AIV is a severe high-frequency vibration that the piping systems carrying vapor or gases may experience near the high-pressure-reducing devices.

Acoustic Induced Vibration (AIV) is generally applicable to lines in gas service. In a Gas System, high levels of high frequency acoustic energy can be generated by a pressure reducing device such as a Relief valve, Control valve or Orifice plate. The amplitude of this energy is governed primarily by the Flow rate & Pressure drop.

2025年1月8日 · Key Differences between FIV and AIV: Frequency: FIV is low-frequency, while AIV is high-frequency. Flow Type: FIV is associated with liquid flow, whereas AIV is associated with gas flow. Sound: AIV produces sound waves within the range of human hearing, while FIV produces less audible sound. Mitigation Strategies

Acoustic Induced Vibration (AIV) refers to structural vibration in a piping system with vapor flow excited by intense acoustic pressure. AIV is caused by acoustic energy from pressure reducing devices with high-pressure drops and vapor services mass flows.

AIV stands for acoustic induced vibration and FIV stands for flow induced vibration. Following are the main differences between the two vibration types: Flow induced vibrations have low frequencies less than 100 Hz. Acoustic induced vibrations are high frequency acoustic waves with frequencies in the range of 500-2500 Hz.

2024年11月19日 · Molecular and structural studies reveal that the N144S, and N144E or R137M substitutions in hemagglutinin (HA) enable H2N2 avian or human viruses to bind or preferentially bind human-type...

In the oil and gas industry, the study of AIV and FIV is essential for ensuring the integrity and reliability of equipment and structures. Here are some common methods used in AIV and FIV studies specifically tailored to the oil and gas industry:

2021年11月30日 · AIV is different from most types of piping vibration because it generally occurs at much higher frequencies (300-1,500 Hz) and is the result of shell mode excitation. For this reason, AIV is typically not visible to the human eye but is noticeable by touch and transmits high-frequency audible noise outside the piping to the surrounding areas.

2009年1月1日 · Subtype-specific multiplex reverse transcription-polymerase chain reaction (RT-PCR) was developed to simultaneously detect three subtypes (H5, H7 and H9) of avian influenza virus (AIV) type A. The sensitivity of the multiplex RT-PCR was evaluated and compared to that of RT-PCR–enzyme-linked immunosorbent assay (ELISA) and conventional RT-PCR.

The document discusses various types of dynamic vibration that can occur in piping systems, including two-phase flow, flow-induced vibration (FIV), acoustic-induced vibration, pulsation and vibration, and pressure relief valve loads.