Accession Number:

AD0257180

Title:

LOW-LEVEL VIBRATION-MEASUREMENT FEASIBILITY STUDY

Descriptive Note:

Corporate Author:

LOCKHEED ELECTRONICS CO PLAINFIELD N J

Personal Author(s):

Report Date:

1960-12-31

Pagination or Media Count:

1.0

Abstract:

Research was conducted to determine the feasibility of using piezoelectric type accelerometers, coupled to electronic integrating networks, for measurement of vibration velocities corresponding to minimum accelerations of 0.0002 g over a frequency range of 10 c to 10 kc. Tests were conducted with a commercial accelerometer operating in conjunction with a new design of amplifier having the lowest noise level presently achievable in the state-of-the-art. The spectrum of the noise was measured, and the sensitivity of the accelerometer-amplifier combination was determined. It was found that accelerations of 0.0002 g could be measured with good SN ratio over the entire frequency range of interest. However, integration of the output to obtain velocities yielded useable SNs only at the lower end of the spectrum. This resulted from the low-frequency peak in the noise spectrum combined with the -6 db per octave slope of the integrating network. It is concluded that peizoelectric accelerometers are not feasible for measurement of vibration velocities down to the minimum levels of interest. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE