Aerospace Instrumentation. Proceedings of the Fourth - download pdf or read online

By M. A. Perry

ISBN-10: 1483198367

ISBN-13: 9781483198361

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Data Transfer D a t a is transferred from the reel recorder on to a loop play-back facility for analysis. To reduce loss in signal quality both Direct and F M recorded signals are transferred from the reel to the loop recorder via direct reproduce/record electronics. During this data transfer from reel to loop recorder a time trans­ formation may be effected for two reasons: 1. To bring the data within the bandwidth of the analyser which is 3 cps to 30,000 cps. 2. To speed up the data to be within the top frequency ranges of the analyser, and hence minimize analysis time and costs.

Cross-correlation between structure acceleration at point A and force input^at point B, 100 200 300 400 500 Frequency, 600 700 800 900 1000 cps FIG. 12e, ii. Phase shift between acceleration at point A and force input at point B. 1. Controllable system without noise. 2. Controllable system with noise. 3. Non-controllable system with noise. The first type (1) refers to a system which will lend itself readily to normal response testing using any required input signals and having no signal/noise 50 R.

We may consider the tone and the noise to be added linearly, and their autocorrelation functions also add linearly. That due to the noise will soon disappear with increasing delay; that due to the sine wave will continue, and the result will be the autocorrelation function shown in Fig. 18. It is interesting to study the limit of the detection. The autocorrelation func­ tion of the noise in fact never drops exactly to zero; it is in fact a random func­ tion, as it must be since the input is random.

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


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