"Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point."
The study of mechanical oscillations and their effects.
Basic concepts of vibration: Understanding of vibration, definitions of terms related to vibration, Importance of studying vibration analysis.
Mathematical tools for vibration analysis: Understanding the mathematical tools used in vibration analysis such as Fourier series, Laplace transforms, Eigen-value analysis, and matrix methods.
Single Degree of Freedom (SDOF) systems: Understanding of SDOF systems, free and forced vibrations, and critical damping.
Multiple Degree of Freedom (MDOF) systems: Understanding of MDOF systems, modal analysis, and natural frequency.
Damping: Understanding of damping and its types, critical damping, and damping coefficient.
Vibratory Force: Understanding of vibratory force, its causes, and its effects on systems.
Transmissibility: Understanding of transmissibility, measurement, and its relationship with frequency.
Resonance: Understanding of resonance, its effects, and its control.
Vibration measurement: Understanding different types of vibration measurement techniques, vibration measuring instruments, and their working principle.
Signal processing: Understanding of signal processing techniques used in vibration analysis, such as filtering, spectrum analysis, and time domain analysis.
Fault diagnosis: Understanding the diagnosis of faults in mechanical systems through vibration analysis.
Balancing: Understanding of balancing in rotating machinery, balancing principles, and methods for balancing.
Machine fault diagnosis: Understanding of machine fault diagnosis, bearing fault diagnosis, and their methods.
Vibration isolation: Understanding of vibration isolation, its types, and methods for isolation.
Vibration control: Understanding of vibration control mechanisms, sensors, and actuators.
Condition Monitoring: Understanding of condition monitoring techniques such as vibration monitoring of machines, and its importance.
Machine Failure Analysis: Understanding of analyzing failure modes in machines using tools such as vibration analysis.
Time Domain Analysis: This method focuses on analyzing the vibration signal over time. It helps in identifying any changes in the frequency content of the signal and detecting faults in rotating machinery based on changes in vibration characteristics.
Frequency Domain Analysis: This method involves analyzing the vibration signal in terms of its frequency content. The goal is to identify the frequency components present in the vibration signal that are related to specific machinery faults, such as unbalance, misalignment, and bearing defects.
Modal Analysis: It aims to identify the natural frequencies, damping factors, and mode shapes of a mechanical system through an experimental measurement or numerical simulation. The results of modal analysis can be used to optimize design or operating conditions and identify any potential resonances or modes of vibration that could cause damage.
Order Analysis: This method involves analyzing the vibration signal in terms of the rotational speed of a machine. It helps in identifying any issues related to gear mesh, shaft misalignment, and unbalanced rotating machinery.
Operating Deflection Shape Analysis: It is a non-destructive test method that involves applying a known excitation frequency to a structure and measuring its response. It helps in identifying the dynamic behavior of a structure and highlighting any areas of concern, such as weak spots or resonance points.
Spectral Analysis: This method involves transforming the time-domain signal into a frequency domain signal through the Fourier Transform. It helps in identifying any periodicity in the vibration signal and detecting any faults related to that frequency such as gearbox, bearing, rotor dynamics, and crankshaft faults.
Acoustic Induced Vibration Analysis: It is a method based on the relationship between vibration and noise. By measuring noise and vibration signals simultaneously, it is possible to identify any faults related to acoustics and vibrations within the system.
Rotordynamics Analysis: It involves the dynamic analysis of rotating machinery, including balancing, vibration, and bearing analysis. It helps in identifying any potential failure modes related to unbalance, misalignment, or resonance.
Time Synchronous Averaging: This method involves averaging multiple acquisitions of time-domain signals and rotating the average back to the zero-phase reference frame. It helps in enhancing the signal-to-noise ratio of the vibration signal, allowing for the identification of small defects in machinery.
Transient Analysis: This method focuses on analyzing the behavior of a system during transient events. An example of this is the investigation of the vibration response of a motor when it is first started. This method helps in identifying characteristics of the transient events and any faults that may arise during such events.
"the motion of a tuning fork, the reed in a woodwind instrument or harmonica, a mobile phone, or the cone of a loudspeaker."
"vibration is undesirable, wasting energy and creating unwanted sound."
"the vibrational motions of engines, electric motors, or any mechanical device in operation."
"imbalances in the rotating parts, uneven friction, or the meshing of gear teeth."
"Careful designs usually minimize unwanted vibrations."
"The studies of sound and vibration are closely related (both fall under acoustics)."
"Sound, or pressure waves, are generated by vibrating structures (e.g. vocal cords)."
"these pressure waves can also induce the vibration of structures (e.g. ear drum)."
"Attempts to reduce noise are often related to issues of vibration."
"Machining vibrations are common in the process of subtractive manufacturing."
"Vibration (from Latin vibrÅ 'to shake')"
"The oscillations may be periodic, such as the motion of a pendulum, or random, such as the movement of a tire on a gravel road."
"the motion of a tuning fork, the reed in a woodwind instrument or harmonica"
"imbalances in the rotating parts...could cause vibrations."
"uneven friction, or the meshing of gear teeth."
"both fall under acoustics"
"pressure waves are generated by vibrating structures (e.g. vocal cords)."
"pressure waves can also induce the vibration of structures (e.g. ear drum)."
"Machining vibrations are common in the process of subtractive manufacturing."