Identification of Dynamic Forces on Aircraft Engine Mounts With the Least Squares Method

HAN Feng; SHEN Chen; XU Junwei

doi:10.21656/1000-0887.410054

Volume 41 Issue 9

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HAN Feng, SHEN Chen, XU Junwei. Identification of Dynamic Forces on Aircraft Engine Mounts With the Least Squares Method[J]. Applied Mathematics and Mechanics, 2020, 41(9): 974-984. doi: 10.21656/1000-0887.410054

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Identification of Dynamic Forces on Aircraft Engine Mounts With the Least Squares Method

doi: 10.21656/1000-0887.410054

¹Department of Functional Structures, Shanghai Aircraft Design and Research Institute, Shanghai 201210, P.R.China;²College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.R.China

Received Date: 2020-02-19
Rev Recd Date: 2020-07-02
Publish Date: 2020-09-01

Abstract

Abstract

For aircraft noise and vibration control, it is vitally important to identify dynamic forces on engine mounts caused by engine operation. Although such dynamic forces are needed to predict and control structural vibration and structure-borne noise in the cabin, they cannot be measured directly in the flight state. The least squares method was employed to identify the dynamic forces based on the frequency response function (FRF) between excitation points and response positions with the actual acceleration measurements in the flight state. A norm condition number criterion was used to evaluate the accuracy of the inverse calculation process, and relative errors of the predicted dynamic forces were calculated. The results show that, the identified forces meet engineering requirements.
- dynamic force identification,
- least squares method,
- FRF,
- engine mount

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References(13)

References

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