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When the vibration is stopped, the waveform will decay, ie, reduce in amplitude, due to frictional losses. See Figure 1 Figure 1: A waveform that demonstrates ring time, which is the time period vibration continues, after resonant excitation ceases. [7] Most people have experienced ring time.
A vibrating belt machine is a device that was promoted to passively reduce body fat through the use of an oscillating or vibrating belt around the exercise subject's waist, without active exercise by the user. The device was widely promoted in the 1950s and 1960s as a way to break up abdominal fat through vibration.
After the move to Oregon, Bucksteel changed its name to Soloflex. The company then used model Scott Madsen in an infomercial to promote their product. [1] By 1984, the company's sales had grown to $18 million annually. [2] Over time, several additions to the machine were made, such as butterfly attachments and leg extensions.
A random vibration test suite may range anywhere from 30 seconds up to several hours. It is intended to synthesize the effect of, for example, a car driving over rough terrain or a rocket taking off. A synthesized shock pulse is a short duration high level vibration calculated as a sum of many half-sine waves covering a range of frequencies.
Vibration can be achieved either through linear vibration welding, which uses a one dimensional back and forth motion, or orbital vibration welding which moves the pieces in small orbits relative to each other. Linear vibration welding is more common due to simpler and relatively cheaper machinery required.
The frequency and amplitude of the machine controls the finish of the parts. The frequencies can vary from 900 to 3600 cycles per minute (CPM) [1] and the amplitude can vary from 0 to 3 ⁄ 16 in (4.76 mm). High frequencies, 1800 CPM or greater, and small amplitudes are used for fine finishes or delicate parts, whereas large amplitudes are used ...
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