OPTIMAL CONTROL OF SHIMMY OSCILLATION IN AIRCRAFT NOSE LANDING GEAR

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TOURAJIZADEH HAMI; ZARE SAEED

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Journal: Modares Mechanical Engineering Year:2015 | Volume:15 | Issue:8 Page(s): 207-215

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Title

OPTIMAL CONTROL OF SHIMMY OSCILLATION IN AIRCRAFT NOSE LANDING GEAR

Author(s)

TOURAJIZADEH HAMI | ZARE SAEED | Issue Writer Certificate

Keywords

LANDING GEARQ2

SHIMMY OSCILLATIONQ2

OPTIMAL CONTROLQ2

NONLINEAR SYSTEMSQ2

Abstract

In this paper, an optimal active controller is designed to prevent the shimmy vibrations in aircraft nose LANDING GEAR. The controller is designed according to the linearized system while the input is implemented on the real non-linear plant. Shimmy vibration is the lateral and torsional vibrations in the wheel that is self-excited and causes instability in high speed performances. This phenomenon is highly impressive since this malfunction over long period of time can damage the LANDING GEAR of the aircraft, its fuselage and can even harm the passengers. Thus, control and suppression of this vibration is extremely important. In this paper, using the nonlinear dynamics of the nose LANDING GEAR system, the equivalent linearized system is extracted and then its related linearized state space is derived. Stability, controllability and observability of the system are investigated based on the linearized model of the system and damping the shimmy vibrations is performed with the least amount of consumed energy using Linear Quadratic Regulator (LQR). To estimate the states of the system which are not measurable using ordinary sensors, an observer is designed and implemented using separation principal. To verify the performance of the proposed controller, vibration response of the open loop system is compared with the closed loop response of the designed OPTIMAL CONTROLler. Considerable improvement can be seen in the performance of the closed loop system since not only are the vibrations effectively damped but also the consumption of energy is minimized. Finally, digital control system is extended in order to implement the proposed controller on the discretized model of the system and the effect of sampling rate on the accuracy of the system is studied.

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APA: Copy

TOURAJIZADEH, HAMI, & ZARE, SAEED. (2015). OPTIMAL CONTROL OF SHIMMY OSCILLATION IN AIRCRAFT NOSE LANDING GEAR. MODARES MECHANICAL ENGINEERING, 15(8), 207-215. SID. https://sid.ir/paper/179080/en

Vancouver: Copy

TOURAJIZADEH HAMI, ZARE SAEED. OPTIMAL CONTROL OF SHIMMY OSCILLATION IN AIRCRAFT NOSE LANDING GEAR. MODARES MECHANICAL ENGINEERING[Internet]. 2015;15(8):207-215. Available from: https://sid.ir/paper/179080/en

IEEE: Copy

HAMI TOURAJIZADEH, and SAEED ZARE, “OPTIMAL CONTROL OF SHIMMY OSCILLATION IN AIRCRAFT NOSE LANDING GEAR,” MODARES MECHANICAL ENGINEERING, vol. 15, no. 8, pp. 207–215, 2015, [Online]. Available: https://sid.ir/paper/179080/en

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