New PDF release: Accidental Injury: Biomechanics and Prevention

By Y. C. Fung (auth.), Alan M. Nahum, John W. Melvin (eds.)

ISBN-10: 1475722648

ISBN-13: 9781475722642

ISBN-10: 1475722664

ISBN-13: 9781475722666

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Extra info for Accidental Injury: Biomechanics and Prevention

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After the transducer in question has been mounted to the pedestal, the pedestal is raised and dropped. The maximum acceleration experienced by the reference accelerometer is captured on a peak meter monitoring the output of the charge amplifier. 15. Drop stand: A dynamic (deceleration pulse) calibration fixture. To the left is a peak hold meter and charge amplifier. On the right is the drop stand and a Kistler piezoelectric accelerometer that serves as a reference. is compared to the peak acceleration of the transducer being calibrated.

Unwanted noise can pose a large problem, especially in large measurement systems. Cabling can contribute substantially to the level of noise within a system. Passing a conductor through an environment filled with electric and magnetic fields assures the presence of noise. Lighting and solenoids contribute heavily to the amount of noise, especially 60 Hz, in a system. Long cables and highimpedance sources pose a particular problem. Proper shielding and cabling techniques can reduce noise levels significantly.

I c. a. : __ Rc completion resistors 0 swich shunt circuit with balance-limiting resistor. (d) Bipolar shunt calibration concept. In high-gain applications the shunt resistor is generally hundreds of times the value of the transducer resistance. Rb Wheatstone bridge b. ~ ~ ~. oo [ ::!. g tT1 o ::s S· ::s ig. '-l ...... ::s 24 Warren N. Hardy ment, providing good temperature compensation. The resistance of both gages is changing equally and oppositely so the output is linear with respect to strain, and is greater (roughly twice) than it would have been when using a single gage.

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Accidental Injury: Biomechanics and Prevention by Y. C. Fung (auth.), Alan M. Nahum, John W. Melvin (eds.)


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