In-flight vibration and temperature measurements on a typical aircraft for test tailoring

Chandra, N and Ananda, CM and Shivaprasad, MV and Rajan, SR and Krishna, Saraswathi and Shivaprasad, S and Venkatasubramanyam, DV and Viswanath, S (2008) In-flight vibration and temperature measurements on a typical aircraft for test tailoring. In: International Conference on Aerospace Science and Technology (INCAST 2008-094), 26-28 Jun 2008, Bangalore, India.

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Test tailoring is a methodology to develop indigenous vibration qualification spectrum for Line Replaceable Units (LRUs) of a typical fighter aircraft based on actual measurements. Data from flight measurements plays a major role in test tailoring approach as the uncertainty factors in measurement process affect the spectrum generated and hence the survivability of LRUs in such environments is reliable. The vibration data generated is used to develop vibration qualification spectrum where as the temperature data is used to qualify the rubber hoses especially at the lower temperature range. The measurement process of such environment involves the proper selection of test points, measurement locations, In-flight Data Acquisition System, Sensors and design of mounting brackets. Since the measurements were performed on flying aircraft safety factors in terms of airworthiness of, additional aggregates were taken care. The test points were suitably dovetailed in about six flights. The data were collected for all the sorties on event basis and synchronized with onboard FDR data. The typical aircraft was a twin fin multi role combat fighter. The maximum vibration levels were observed at wing tip, fin tip, fin root and near pylon in line with expected results. This paper presents the methodology adopted for measurement of in-flight vibration and temperature data required for specification development through test tailoring. The paper briefly describes the architecture of the in-flight data acquisition system, instrumentation scheme, requirements and specification of sensors, the identification of measurement points on the aircraft, design and fabrication of bracketaries required for mounting IFDAS and sensors, details of test points that have bearing on vibration and temperature, in-flight data acquisition and quick look analysis of data. The vibration data were collected at 12 locations in all three directions and thermal data were collected at 6 locations.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Fighter aircraft;Test tailoring;In-flight vibration;Combat fighter
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 12 Mar 2009
Last Modified: 24 May 2010 04:26

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