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Landing gear

About: Landing gear is a research topic. Over the lifetime, 3403 publications have been published within this topic receiving 25370 citations. The topic is also known as: landing gear & gear.


Papers
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Journal ArticleDOI
TL;DR: In this article, an innovative concept to anti-crash absorber in composite material to be integrated on the landing gear as an energy-absorbing device in crash conditions to absorb the impact energy.
Abstract: This paper defines an innovative concept to anti-crash absorber in composite material to be integrated on the landing gear as an energy-absorbing device in crash conditions to absorb the impact energy. A composite cylinder tube in carbon fiber material is installed coaxially to the shock absorber cylinder and, in an emergency landing gear condition, collapses in order to enhance the energy absorption performance of the landing system. This mechanism has been developed as an alternative solution to a high-pressure chamber installed on the Agusta A129 CBT helicopter, which can be considered dangerous when the helicopter operates in hard and/or crash landing. The characteristics of the anti-crash device are presented and the structural layout of a crashworthy landing gear adopting the developed additional energy absorbing stage is outlined. Experimental and numerical results relevant to the material characterization and the force peaks evaluation of the system development are reported. The anti-crash prototype was designed, analysed, optimized, made and finally the potential performances of a landing gear with the additional anti-crash absorber system are tested by drop test and then correlated with a similar test without the anti-crash system, showing that appreciable energy absorbing capabilities and efficiencies can be obtained in crash conditions.

16 citations

01 Oct 1951
TL;DR: In this paper, the self-excited vibration of a landing gear is generated in an interplay of effects present in the tire, the landing gear proper, and in the entire airframe itself.
Abstract: : The self-excited vibration of a landing gear is generated in an interplay of effects present in the tire, the landing gear proper, and in the entire airframe itself The analysis of these simultaneous actions is given in simple form; the manner in which energy enters the system, and the necessary structural modifications to control shimmy are explained

16 citations

Journal ArticleDOI
01 Jun 2014
TL;DR: In this article, a tool chain for extended physics-based wing mass estimation is introduced, which consists of the structural analysis model, models for aerodynamic, fuel, landing gear and engine loads as well as a sizing algorithm.
Abstract: This article introduces a tool chain for extended physics-based wing mass estimation. Compared to state-of-the-art tool chains, the physics-based structural modelling is extended beyond the wing primary structure. The structural model also includes the movable trailing edge devices including tracks, the spoilers, the engine pylons and the landing gear. The chain consists of the structural analysis model, models for aerodynamic, fuel, landing gear and engine loads as well as a sizing algorithm. To make the complexity of the model generation process feasible for preliminary aircraft design, a knowledge-based approach is chosen. This means that the analysis models are created partly automatically, which leads to a minimum set of required input parameters for the central model generator. The DLR aircraft parametrisation format Common Parametric Aircraft Configuration Scheme is used as central data model for input and output. Therefore, the chain can be easily included in a wider multidisciplinary aircraft design environment.

16 citations

Patent
17 Aug 1983
TL;DR: In this paper, a shaped support beam is joined to and extends laterally across a landing gear door to provide support and to hold a retracted airplane landing gear in position when the door is closed.
Abstract: A shaped support beam is joined to and extends laterally across a landing gear door to provide support and to hold a retracted airplane landing gear in position when the landing gear door is closed. Pivotable linkage, extending between airplane structure and the shaped support beam, press against the landing gear to hold the gear in the retracted position with the door latched, and to be pressed against to move an unlatched door aside to permit extension of the landing gear into operating position.

16 citations

01 Dec 2012
TL;DR: The drop test data models provide a positive feasibility test which is the basis for moving on to the critical task of prediction on flight test data, and a wide range of available flight test measurements are considered for potential model inputs.
Abstract: This article investigates the feasibility of using machine learning algorithms to predict the loads experienced by a landing gear during landing. For this purpose, the results on drop test data and flight test data will be examined. This article will focus on the use of Gaussian process regression for the prediction of loads on the components of a landing gear. For the learning task, comprehensive measurement data from drop tests are available. These include measurements of strains at key locations, such as on the side-stay and torque link, as well as acceleration measurements of the drop carriage and the gear itself, measurements of shock absorber travel, tyre closure, shock absorber pressure and wheel speed. Ground-to-tyre loads are also available through measurements made with a drop test ground reaction platform. The aim is to train the Gaussian process to predict load at a particular location from other available measurements, such as accelerations, or measurements of the shock absorber. If models can be successfully trained, then future load patterns may be predicted using only these measurements. The ultimate aim is to produce an accurate model that can predict the load at a number of locations across the landing gear using measurements that are readily available or may be measured more easily than directly measuring strain on the gear itself (for example, these may be measurements already available on the aircraft, or from a small number of sensors attached to the gear). The drop test data models provide a positive feasibility test which is the basis for moving on to the critical task of prediction on flight test data. For this, a wide range of available flight test measurements are considered for potential model inputs (excluding strain measurements themselves), before attempting to refine the model or use a smaller number of measurements for the prediction.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202353
2022135
2021101
2020116
2019199
2018190