Advanced Technology Helicopter Landing Gear.

1977 ◽  
Author(s):  
Ralph E. Goodall
Keyword(s):  
Landing Gear ◽  
Advanced Technology ◽  
Helicopter Landing

Test and Analysis of an Advanced Technology Landing Gear

1992 ◽  
Vol 37 (3) ◽  
pp. 42-52 ◽  
Author(s):  
Joyanto K. Sen ◽  
Akif O. Bolukbasi ◽  
Ned A. Chase
Keyword(s):  
Landing Gear ◽  
Advanced Technology

Design and Testing of a Crashworthy Landing Gear

2015 ◽  
Author(s):  
Tae-Uk Kim ◽  
JeongWoo Shin ◽  
Sang Wook Lee
Keyword(s):  
High Speed ◽  
Shock Absorber ◽  
Landing Gear ◽  
Collapse Mechanism ◽  
Gear Design ◽  
Helicopter Landing ◽  
Drop Tests ◽  
The Military ◽  
Secondary Hazards ◽  
Design And Testing

The development of a crashworthy landing gear is presented based on the civil regulations and the military specifications. For this, two representative crashworthy requirements are applied to helicopter landing gear design; the nose gear is designed to collapse in a controlled manner so that it does not penetrate the cabin and cause secondary hazards, and the main gear has to absorb energy as much as possible in crash case to decelerate the aircraft. To satisfy the requirements, the collapse mechanism triggered by shear-pin failure and the shock absorber using blow-off valve are implemented in the nose and main gear, respectively. The crash performance of landing gear is demonstrated by drop tests. In the tests, performance data such as ground reaction loads and shock absorber stroke are measured and crash behaviors are recorded by high-speed camera. The test data shows a good agreement with the prediction by simulation model, which proves the validity of the design and analysis.

Investigation into recurring military helicopter landing gear failure

2016 ◽  
Vol 63 ◽  
pp. 121-130 ◽  
Author(s):  
Branimir Krstic ◽  
Lamine Rebhi ◽  
Dragan Trifkovic ◽  
Nabil Khettou ◽  
Marjan Dodic ◽  
...  
Keyword(s):  
Landing Gear ◽  
Helicopter Landing

Design and Testing of a Crashworthy Landing Gear

2017 ◽  
Vol 3 (4) ◽  
Author(s):  
Tae-Uk Kim ◽  
JeongWoo Shin ◽  
Sang Wook Lee
Keyword(s):  
High Speed ◽  
Shock Absorber ◽  
Landing Gear ◽  
Collapse Mechanism ◽  
Gear Design ◽  
Helicopter Landing ◽  
Drop Tests ◽  
The Military ◽  
Secondary Hazards ◽  
Design And Testing

The development of a crashworthy landing gear is presented based on the civil regulations and the military specifications. For this, two representative crashworthy requirements are applied to helicopter landing gear design: the nose gear is designed to collapse in a controlled manner so that it does not penetrate the cabin and cause secondary hazards, and the main gear has to absorb energy as much as possible in crash case to decelerate the aircraft. To satisfy the requirements, the collapse mechanism triggered by shear-pin failure and the shock absorber using blow-off valve (BOV) is implemented in the nose and main gear, respectively. The crash performance of landing gear is demonstrated by drop tests. In the tests, performance data such as ground reaction loads and shock absorber stroke are measured and crash behaviors are recorded by high-speed camera. The test data show a good agreement with the prediction by simulation model, which proves the validity of the design and analysis.

Behavior of Magnetorheological Fluids Employing Carrier Fluids Certified for Landing Gear Use

2008 ◽  
Author(s):  
Louise Ahure´ ◽  
Norman M. Wereley
Keyword(s):  
Magnetic Field ◽  
Magnetic Particles ◽  
Landing Gear ◽  
Small Scale ◽  
Hydraulic Systems ◽  
Sedimentation Analysis ◽  
Mr Fluids ◽  
Helicopter Landing ◽  
Different Characteristics ◽  
Potential Use

Magnetorheological (MR) fluids were prepared in order to investigate their performance for potential use in landing gear hydraulic systems, such as shock struts. MR fluids formulated here utilized three hydraulic oils certified for use in landing gear, two different average diameters of spherical magnetic particles, and a Lecithin surfactant. The fluids were characterized in order to measure and analyze their rheological behavior. Therefore, different characteristics were taken into consideration, such as 1) magnetorheology as a function of magnetic field, 2) cycling of a small-scale damper undergoing sinusoidal excitations at frequencies of 2.5 and 5 Hz, and 3) sedimentation analysis conducted with an inductance-based sensor. The goal of this research is to analyze the performance of these particular MR fluids, to compare their behavior to standard commercial MR fluids, and to determine their feasibility for use in helicopter landing gear.

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