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Aerospace Instrumentation. Proceedings of the Fourth by M. A. Perry PDF

By M. A. Perry

ISBN-10: 1483198367

ISBN-13: 9781483198361

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Extra resources for Aerospace Instrumentation. Proceedings of the Fourth International Aerospace Symposium

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D) Correlation between two inputs. 56 R. LAWSON AND A. M. , in rotating machinery which is required to operate over a range of speeds. FIXED TIMING OSCILLATOR. RMS METER. INPUT VaiAGE AMPLIFIER. SIGNAL. TRIGGER LEVELl UNIT. OSCILLATOR SWITCH. J OFFSET VOLTAGE. COUNTER, TRIGGER LEVEL UNIT. VOLTAGE REF Trigger level unit outputs. Oscillator switch output. Bands of 'timing' frequency from f i x e d oscillator. F I G . 20. Probability density function analyser. 4. Probability Density Analyser. The description of a process partially in terms of its probability density function is generally accepted as a meaningful analytical procedure.

The first type of problem is one in which there exists a fundamental frequency plus its overtones. A typical spectrum is shown in Fig. 7 which relates THE A N A L Y S I S OF R A N D O M 43 SIGNALS to the spectrum of noise derived from an axial compressor. In this case it may be that the main requirement is for a knowledge of the pressure level at each frequency. Under these circumstances it is permissible to analyse the data with a filter bandwidth which may be in excess of the bandwidth of the data at the frequencies of interest.

M. S T O N E large scale of some of the projects—over a thousand transducers not being uncommon, it is essential to use 14-channel 1 in. tape. The tape recorder selected is the F R 1300 Ampex since it satisfied the following requirements: (a) The electronics are DC—20 kc/s F M and 50 c/s—300 kc/s Direct Record. This range of bandwidth covers the likely areas of interest in the mechani­ cal/acoustical fields of application. However, the wide band Direct Record has the disadvantage that the signal/noise ratio often raises problems.

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Aerospace Instrumentation. Proceedings of the Fourth International Aerospace Symposium by M. A. Perry


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