Frequency; Amplitude; Free Vibration; Forced Vibration - Suzuki XL7 2007 Service Manual

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0A-21 General Information:

Frequency

2. Reference

Frequency is defined as the rate at which an event occurs during a given period of time. With a vibration, the event is

a cycle, and the period of time is 1 second. Thus, frequency is expressed in cycles per second.

The proper term for cycles per seconds is Hertz (Hz). This is the most common way to measure frequency. Multiply the

Hertz by 60 to get the cycles or revolutions per minute (RPM).

3. Zero-to-Peak Amplitude

3. Time in Seconds

4. Peak-to-Peak Amplitude

Amplitude is the maximum value of a periodically varying

quantity. Used in vibration diagnostics, we are referring it

to the magnitude of the disturbance. A severe

disturbance would have a high amplitude; a minor

disturbance would have a low amplitude.

Amplitude is measured by the amount of actual

movement, or the displacement. For example, consider

the vibration caused by an out-of-balance wheel at 80

km/h (50 mph) as opposed to 40 km/h (25 mph). As the

speed increases, the amplitude increases.

Free vibration is the continued vibration in the absence

of any outside force. In the yardstick example, the

yardstick continued to vibrate even after the end was

Forced vibration is when an object is vibrating

continuously as a result of an outside force.