Types of Vibration

  • Free vibration occurs when a system is set in motion and allowed to vibrate freely
  • Forced vibration happens when a time-varying disturbance is applied to a system
  • Damped vibration occurs when the energy of a vibrating system is gradually dissipated
  • Harmonic disturbance is a periodic and steady-state input that can cause forced vibration
  • Non-harmonic disturbance is a non-periodic input that can also cause forced vibration

Vibration Isolation

  • Vibration isolation prevents the transmission of vibration from one component to others
  • Vibrations propagate via mechanical waves, and certain linkages conduct vibrations more efficiently
  • Passive vibration isolation uses materials and linkages to absorb and damp mechanical waves
  • Active vibration isolation involves sensors and actuators that produce disruptive interference
  • Vibration isolation is important in engineered systems and habitable spaces

Vibration Testing

  • Vibration testing introduces a forcing function into a structure to examine its response
  • Shakers are commonly used to apply the forcing function to the structure
  • Vibration testing can assess the ability of a device to function in a vibration environment
  • Different types of vibration testing include sine tests and random tests
  • Vibration testing can be conducted in multiple axes simultaneously

Vibration Analysis

  • Vibration analysis aims to reduce maintenance costs and equipment downtime
  • It is used in a condition monitoring program to detect equipment faults
  • Vibration analysis is commonly used to detect faults in rotating equipment
  • Common faults detected include imbalance, misalignment, and bearing faults
  • Vibration analysis can be displayed as time waveforms or spectra

Related Studies and Concepts

  • The studies of sound and vibration are closely related and fall under acoustics
  • Sound is generated by vibrating structures and can induce vibration in other structures
  • Attempts to reduce noise are often related to issues of vibration
  • Designing vibration control is undertaken in acoustic, automotive, and mechanical engineering
  • Machining vibrations are common in the process of subtractive manufacturing
  • Frequency response function (FRF) is the transfer function of the system in vibration analysis
  • FRF has both magnitude and phase components and can be used to determine vibration characteristics

Vibration Data Sources

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