Multi-objective Optimization of Passive Shock Absorber for Landing Gear

Shi, Fengyan

doi:10.12691/ajme-7-2-4

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…A typical shock absorber with an existing single modified tapered metering pin design is illustrated in [12]. A metering pin with a variable cross-section is linked to the lower piston.…”

Section: Design Model For Metering Pinmentioning

confidence: 99%

Research on Landing Gear Metering Pin and Analysis of its Impact on the Buffer Performance

Vencatasawmy¹,

Xue²

2020

IJERT

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Buffer performance system or the resistance force of a landing gear mechanical structure is one of the key points for aircraft landing gear design as not only does it provide structural strength but it also ensures smooth landing and a reduction of fuel consumption. This paper investigates the possibility of improving the effectiveness of the buffer performance of a landing gear with a new metering pin design. The shape of the metering pin inside the shock absorber affects directly the buffer absorption efficiency and buffer absorption power. The objective of this research is to gather previous data of existing shock absorbers, analyse its influence throughout different parameters and come up with a new possible improved metering pin design to determine how the efficiency is affected. A new ideal approach to investigate the impact of a new metering pin device on shock absorption efficiency of a landing gear is proposed.

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“…A typical shock absorber with an existing single modified tapered metering pin design is illustrated in [12]. A metering pin with a variable cross-section is linked to the lower piston.…”

Section: Design Model For Metering Pinmentioning

confidence: 99%

Research on Landing Gear Metering Pin and Analysis of its Impact on the Buffer Performance

Vencatasawmy¹,

Xue²

2020

IJERT

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“…To increase the landing efficiency, the metering pin is always embedded to change the orifice gap, and thereafter the buffering force according to the flow velocity and available stroke. However, passive SAs even with a well-designed orifice shape cannot generate an appropriate damping force with different conditions subjected to varying gross weight and impact velocity (Shi et al, 2019). In addition, the landing efficiency is far from meeting the demands because of the lack of realtime adaptability to variable crash environments.…”

Section: Introductionmentioning

confidence: 99%

Optimal control for soft-landing in elevator emergency crash using multiple magnetorheological shock absorbers

Zheng

Zhao

Wang

et al. 2022

Journal of Intelligent Material Systems and Structures

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Protecting the occupants from surviving the casualties and severe injuries in elevator emergency crashes is always essential. This paper aims to explore the feasibility of using multiple magnetorheological shock absorbers (M-MRSAs) to attain the soft landing of a full-load elevator under impact velocities ranging up to 32 m/s. The resistance forces of MRSA with a bi-fold structure are predicted by evaluating the pressure drops using a nonlinear Bingham-plastic model considering the effects of minor loss. The optimal control for an M-MRSAs system achieving robustness concerning different mass loadings and impact velocities is investigated by formulating a multi-objective problem to minimize the induced peak acceleration with constrained time duration. The results demonstrate that the self-adapting MR yield force provides a smooth operation by minimizing the cycles of re-crash and rebound without incurring an end-stop impact. Furthermore, a plateau behavior of acceleration-displacement profiles is realized to effectively reduce the load transmission from overshoot accelerating force to the protected occupants and eliminate the injury risk.

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“…Chester [11] employed a parametric method to simulate landing impact, determining the reaction of the main and nose gears by pitching and heaving degrees of freedom of the aircraft motion. Shi [12] and Shi et al [13] performed single and multi-objective optimization studies of passive shock absorber for landing gears by considering four types of metering pins including conventional taper pin, multi-taper, single-parabolic and multiparabolic configurations. Asthana and Bhat [14] proposed a novel design of landing gear oleo strut damper using magnetorheological fluid for aircraft and UAVs.…”

Section: Introductionmentioning

confidence: 99%

Metering Pin Diameter Optimization of an Aircraft Landing Gear Shock Absorber

Dinç

2021

Eskişehir Teknik Üniversitesi Bilim Ve Teknoloji Dergisi B - Teorik Bilimler

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One of the most important components of an aircraft is the landing gear. In today`s modern landing gears, mostly oleopneumatic shock struts are used. Analytically, landing gear can be modeled as a mass-spring-damper system. The model used in the study included landing gear components such as the oleo-pneumatic shock strut, tire and wheel. Furthermore, a tapered metering pin was added to model in order to control the area of the orifice by which hydraulic oil flows during the act of landing impact force. Landing gear design usually aims to minimize two elements which are vertical acceleration and displacement of aircraft mass. The impact force during landing is indicated by vertical acceleration. Displacement of shock absorber should be minimum to decrease the size, weight and space needed for the landing gear system. An optimization problem was defined to minimize those two parameters within the range of given inputs. For this purpose, a composite objective function was created to include and optimize the two output parameters simultaneously with equal weight. Among many inputs, metering pin hub and tip external diameters were selected as variables for the optimization and other inputs were kept constant. For the optimization study, genetic algorithm method was coupled with the Matlab/Simulink model of the landing gear model. After some iterations, solution was converged to determine the two diameters of the metering pin where the vertical acceleration and displacement of aircraft mass are minimized as an objective. At the end of optimization process, vertical acceleration of aircraft mass was reduced from 2.433 g to 1.7828 g (-36.47%) within the given constraint of 2 g maximum. Displacement of aircraft mass X1 was increased from 0.2982 m to 0.3682 m (+23.47%) which is in an acceptable limit of 0.4 m.

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Multi-objective Optimization of Passive Shock Absorber for Landing Gear

Cited by 5 publications

References 12 publications

Research on Landing Gear Metering Pin and Analysis of its Impact on the Buffer Performance

Research on Landing Gear Metering Pin and Analysis of its Impact on the Buffer Performance

Optimal control for soft-landing in elevator emergency crash using multiple magnetorheological shock absorbers

Metering Pin Diameter Optimization of an Aircraft Landing Gear Shock Absorber

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