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

By M. A. Perry

ISBN-10: 1483198367

ISBN-13: 9781483198361

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

Sample text

LAWSON and A. M. STONE English Electric Mechanical Engineering Labratory THE data analysis facility described in this paper has been designed to satisfy the needs of the English Electric Co. Ltd. in the fields of fundamental research and major power plant design and commissioning. It has become very clear that with the present trend to higher unit capacity of power plants, extensive investigations are necessary at the commissioning stage to provide the back­ ground data necessary for the improvement and assessment of designs.

RAMP LOCAL GENERATOR OSCILLATOR DATA ^ 1 ^ AMPLIFIER (RESPONSE) MODULATOR FILTER M MULTIPLIER INPUT DATA (EXCITATION) P R E - A M P L I F I E R INPUT •*H MODULATOR X-Y FILTER FILTER RECORDER MULTIPLIER •«4 DIVIDER *{ SMOOTHER FIG. 1 3 . Transfer function analyser. In the case (2), where noise is present at some point in the system it is still possible to determine the transfer function in simple cases. Since in general, there will be no correlation between the noise and test signal the configuration presented in Fig.

The basic configuration of the analyser in the Transfer Function Mode is shown in Fig. 13 which operates in a very similar manner to the cross-correlation analyser. As an example of the system in THE A N A L Y S I S OF R A N D O M 49 SIGNALS operation in this mode the characteristics of the simple circuit of Fig. 14a will be investigated. 9 σ ϊ o A X \ 0-4 u 0-2 - J IDO l 200 \l 300 I . I 400 500 I I I ; 600 700 800 900 Frequency, I 1000 cps FiG. 12e, i. 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.

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


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