1Vibration analysis is called ___ because the analysis involves identifying the different modes of vibration.
Model Analysis
2Stored energy with a structure is transformed between potential (elastic deformation) and kinetic (moving mass) energy.
Vibration
3Modal analysis applies its own ___ to vibration the component in the various modes.
Forces
4Different Types of Vibration Modes for an I Beam
Vertical Vibration
Sideways Vibration
Torsional Vibration
5The whole body ___ is a kind of rapid, low amplitude, strictly controlled vibration in intensity and direction exercise which achieves health benefits.
Vertical Vibration
6Lateral, or side-to-side runout, is the measurement of the sideways motion or wobble in a wheel or tire as it rotates.
Sideways Vibration
7Is the angular vibration of the object commonly a shaft along its axis of rotation.
Torsional Vibration
8Is the study of the dynamic properties of structures under vibrational excitation.
Modal Analysis
9It looks at the different modes of vibration and the frequencies that generate them.
Modal Analysis
10Two Types of Modal Analysis
Analytical Modal Analysis
Experimental Modal Analysis
11Depends on the generation of the equations of motion of a system through a finite element model.
Analytical Modal Analysis
12Is the process of characterizing the dynamic response of a system in terms of its modes of vibration.
Modal Analysis
13Depends on parameter estimation techniques to extract modal information from experimental data.
Experimental Modal Analysis
14Ratio of the output response of a structure to the applied force.
Frequency Response Function (FRF)
15The applied force and structure response are measure simultaneously.
Frequency Response Fuction (FRF)
16Time domain data is transformed to frequency domain (FFT).
Frequency Response Function (FRF)
17Components Used to Take Measurements
Shaker
Hammer
Accelerometer
18Two Types of FRF
Drive Point FRF
Cross FRF
19Excitation and measurement at same location.
Drive Point FRF
20Excitation and measurement at different location.
Cross FRF
21Is the rate at which current changes direction per second.
Frequency
22Is equal to one cycle per second.
Hertz (Hz)
23One complete wave of alternating curent or voltage.
Cycle
24One half of a cycle.
Alternation
25The time required to produce one complete cycle of a waveform.
Period
26The number of complete cycles of a wave that occur in one second.
Frequency
27The time required for one complete cycle of a wave.
Period
28The maximum displacement of a wave from its equilibrium position.
Amplitude
29The amount by which one wave lags or leads another wave of the same frequency.
Phase
30The representation of a signal in the frequency domain.
Spectrum
31Focuses on examining the behavior of vibrations over time.
Time-Domain Analysis
32Time-Domain Analysis Monitoring
Structural Health Monitoring
Machinery Condition Monitoring
33Time domain analysis is used to monitor the condition of structures such as bridges, buildings, and dams.
Structural Health Monitoring
34Time domain analysis is employed to monitor the health of rotating machinery like turbines, pumps, and motors.
Machinery Condition Monitoring
35Is a specialized technique within vibration analysis that deals with stochastic or random vibrations.
Random Vibration Analysis
36Sources of Random Vibrations
Environmental Factors
Random Forces
Noise and Vibrations
37Random vibrations can be caused by external environmental factors, such as wind, ocean waves, earthquakes, or road irregularities.
Environmental Factors
38Machinery and structures may be subjected to random forces generated by internal sources, such as the flucturation of fluid pressures, mechanical interations, or turbulent flow in pipelines.
Random Forces
39Generated by various equipment can introduce random vibrations into nearby machinery or structures.
Noise and Vibrations
40Some Functions of Random Vibration Analysis
Reliability Assessment
Design Optimization
Environmental Testing
Fatigue Analysis
41Random vibration analysis helps assess the reliability and robustness of engineering systems, especially those exposed to unpredictable or random forces.
Reliability Assessment
42By simulating the response of a system to random excitation during the design phase, engineers can optimize the design to reduce vibrations, minimize stress levels, and improve overall performance.
Design Optimization
43Random vibration analysis is used to replicate real-world operating conditions during environmental testing.
Environmental Testing
44Random vibrations can lead to fatigue failure in material and structures.
Fatigue Analysis
45Benefits of Vibration Analysis
The potential for failure can be readily identified.
Data can be collected by anyone.
A portable collection route can be rapidly established.
There are multiple uses of VA beyond the most prevalent bearing failure search.
46Cons of vibration Analysis
Time-Consuming
Decreased Repeatability