Aircraft Random Vibration Analysis Using Active Landing Gears

Sivakumar, S.; Haran, A. P.

doi:10.1260/0263-0923.34.3.307

Cited by 19 publications

(18 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The acquisition range extended from 2500 to 500 m/s 2 . A total of five sets of cutting test data were collected; we estimated the power spectrum by the fast Fourier transformation (FFT) [16][17][18][19] in the signal analysis tool SPTOOL in MATLAB. We calculated the acceleration values of the center frequency of the five measurements and plotted a cylindrical shape, as shown in Figure 2.…”

Section: Standard For Measurement and Evaluation Of Human Hand Contacmentioning

confidence: 99%

Vibration analysis and optimization of a vertical disc stump grinder

Li-hong

Wang

Zeng

et al. 2018

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The vibration of the handles of a vertical disc stump grinder causes significant damage to people who operate the machine for a long time. First, we tested the vibration of the handle of a vertical disc stump grinder. Second, we evaluated the allowable years of operating the vertical disc stump grinder according to the assessment standard ISO 5349 for human exposure to hand-transmitted vibration by the International Organization for Standardization. Third, we established a finite element model of the stump grinder based on the experience model of the engine and the power spectrum of the cutting force of the grinder. Finally, we proposed an optimization scheme for the vertical disc stump grinder according to the finite element model. The experimental results indicate that the output weighted acceleration of the existing handle of the vertical disc stump grinder is 47.89 m/s 2 and the allowable years for operating the grinder are less than one. The simulation results indicate that the finite element model of the vertical disc stump grinder is useful for analyzing the vibration of the handle. The output weighted acceleration of the existing handle of the vertical disc stump grinder is 8.87 m/s 2 after optimization, with the allowable years of operation increased to 3 years. Thus, the optimization scheme is feasible.

show abstract

Section: Standard For Measurement and Evaluation Of Human Hand Contacmentioning

confidence: 99%

Vibration analysis and optimization of a vertical disc stump grinder

Li-hong

Wang

Zeng

et al. 2018

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…The shaping filter method is used to generate randomtype runway irregularities. 25 Random-type runway irregularities typically represented as random process with a ground displacement PSD in the form 26 ðÞ…”

Section: Modelling Of Random-type Runway Irregularitiesmentioning

confidence: 99%

Active control of a non-linear landing gear system having oleo pneumatic shock absorber using robust linear quadratic regulator approach

Yazıcı

Sever

2017

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

This paper deals with the active control of a non-linear active landing gear system equipped with oleo pneumatic shock absorber. Runway induced vibration can cause reduction of pilot's capability of control the aircraft and results the safety problem before takeoff and after landing. Moreover, passenger-crew comfort is adversely affected by vertical vibrations of the fuselage. The active landing gears equipped with oleo pneumatic shock absorber are highly non-linear systems. In this study, uncertain polytopic state space representation is developed by modelling the pneumatic shock absorber dynamics as a mechanical system with non-linear stiffness and damping properties. Then, linear matrix inequalities-based robust linear quadratic regulator controller having pole location constraints is designed, since the classical linear quadratic regulator control design is dealing with linearized state space models without considering the non-linearities and uncertainties. Thereafter, numerical simulation studies are carried out to analyse aircraft response during taxiing. Bump-and random-type runway irregularities are used with various runway class and wide range of longitudinal speed. Simulation results revealed that neglecting the non-linear dynamics associated with oleo pneumatic shock absorber results significant performance degradation. Consequently, it is demonstrated that proposed robust linear quadratic regulator controller has a superior performance in terms of passenger-crew comfort and operational safety when compared to classical linear quadratic regulator.

show abstract

“…Then, very poor random runway profile is used as the worst case disturbance input. The runway disturbance is generated by a shaping filter method which is described in [22,33,34]. It is typically specified as random process with a ground displacement Power Spectral Density (PSD) of…”

Section: Numerical Simulation Studymentioning

confidence: 99%

Observer Based Optimal Vibration Control of a Full Aircraft System Having Active Landing Gears and Biodynamic Pilot Model

Yazıcı

Sever

2016

Shock and Vibration

View full text Add to dashboard Cite

This paper deals with the design of an observed based optimal state feedback controller having pole location constraints for an active vibration mitigation problem of an aircraft system. An eleven-degree-of-freedom detailed full aircraft mathematical model having active landing gears and a seated pilot body is developed to control and analyze aircraft vibrations caused by runway excitation, when the aircraft is taxiing. Ground induced vibration can contribute to the reduction of pilot’s capability to control the aircraft and cause the safety problem before take-off and after landing. Since the state variables of the pilot body are not available for measurement in practice, an observed based optimal controller is designed via Linear Matrix Inequalities (LMIs) approach. In addition, classical LQR controller is designed to investigate effectiveness of the proposed controller. The system is then simulated against the bump and random runway excitation. The simulation results demonstrate that the proposed controller provides significant improvements in reducing vibration amplitudes of aircraft fuselage and pilot’s head and maintains the safety requirements in terms of suspension stroke and tire deflection.

show abstract

Aircraft Random Vibration Analysis Using Active Landing Gears

Cited by 19 publications

References 10 publications

Vibration analysis and optimization of a vertical disc stump grinder

Vibration analysis and optimization of a vertical disc stump grinder

Active control of a non-linear landing gear system having oleo pneumatic shock absorber using robust linear quadratic regulator approach

Observer Based Optimal Vibration Control of a Full Aircraft System Having Active Landing Gears and Biodynamic Pilot Model

Contact Info

Product

Resources

About