Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Textbook Question
Chapter 12, Problem 12.14P
In Example 12.2, integration is identified as a method for reducing the effects of noise in a signal. Discuss how a moving average can be used to reduce the effects of noise in a velocity measurement through the integration of an acceleration signal. Discuss the effects of averaging time on the elimination of noise. Assume that the noise has significant amplitude but has higher-frequency content than the velocity being measured.
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A displacement transducer has the following specifications:
Linearity error: ±0.25% reading
Drift: ±0.05%/°C reading
Sensitivity error: ±0.25% reading
Excitation: 10-25 V dc
Output: 0-5Vdc
Range: 0-5 cm
The transducer output is to be indicated on a voltmeter having a stated accuracy of 0:1% reading with a resolution of 10 μV. The system is to be used at room temperature, which can vary by 10 °C. Assume 95% confidence.
The displacement transducer above is used in measuring the displacement of a body impacted by a mass. Twenty measurements are made, which yield
X= 17.20mm
Sx= 1.70mm
Determine a best estimate for the mass displacement at 95% probability based on all available information.
S
3: Light gates may be used to measure the speed of projectiles, such as
arrows shot from a bow. English longbows made of yew in the 1400s achieved launch
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Chapter 12 Solutions
Theory and Design for Mechanical Measurements
Ch. 12 - Prob. 12.11PCh. 12 - Determine the bandwidth for a seismic instrument...Ch. 12 - In Example 12.2, integration is identified as a...Ch. 12 - Consider a moving coil transducer having a coil...Ch. 12 - Hydrophones are microphones designed to be used...Ch. 12 - Research the use of load cells in robotics, both...Ch. 12 - Prob. 12.22PCh. 12 - Prob. 12.25PCh. 12 - Prob. 12.26PCh. 12 - Prob. 12.27P
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