Aircraft identification : friend or foe?

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The responseof the system would again be measured. This processwould be repeated for various other weights and weight locations. From the result of these measurements, an empirical relationship could be derived for relating mass shiftsto frequencyresponse. Applicationof the VibrationResponsetechniqueto measurementof mass migration in a heat pipe is similar to the experimental procedure described above. Prior to subjectingthe heat pipe to inducedvibration loads, a dummy heat pipe, identical in all structural and physical propertiesis tested.

Applicationof the VibrationResponsetechniqueto measurementof mass migration in a heat pipe is similar to the experimental procedure described above. Prior to subjectingthe heat pipe to inducedvibration loads, a dummy heat pipe, identical in all structural and physical propertiesis tested. That is, the dummyheat pipeis shaken for a series of varyingweights and weightdistributions. The resultsare then correlatedinto an empiricalrelationshipfor vibrationresponseas a 36 functionof mass distributionfor that specificheat pipe.

For instance, as stated before, the dummy heat pipe must be the structural equivalent of the actual heat pipe. In practice, this becomes difficult to achieve. Prior to thermal testing, the heat pipes for both the low and high temperature tests must be instrumented with thermocouples. These thermocouples would be either mechanically fastened or welded to the heat pipes. The leads which are a part of these thermocouples would be prone to some shifting of locationas a result of handling. While measures could be taken to ensure this situation does not occur, it does add to the cost and complexity of the heat pipe designs and their associated dummy heat pipes.

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