scholarly journals Feedback Local Optimality Principle Applied to Rocket Vertical Landing (VTVL)

2020 ◽  
pp. 227-235
Author(s):  
Dario Antonelli ◽  
Gianluca Pepe ◽  
Leandro Nesi ◽  
Antonio Carcaterra
Keyword(s):  
Local Optimality ◽  
Optimality Principle ◽  
Vertical Landing

scholarly journals Triangular Phase Shift Detector for Drone Precise Vertical Landing RF Systems

2021 ◽  
Vol 70 ◽  
pp. 1-8
Author(s):  
Victor Arana-Pulido ◽  
Eugenio Jimenez-Yguacel ◽  
Francisco Cabrera-Almeida ◽  
Pedro Quintana-Morales
Keyword(s):  
Phase Shift ◽  
Rf Systems ◽  
Vertical Landing

The Landing Gear of the SC.l Aircraft

1960 ◽  
Vol 64 (590) ◽  
pp. 81-86
Author(s):  
H. G. Conway
Keyword(s):  
Delta Wing ◽  
Landing Gear ◽  
Unusual Feature ◽  
Centre Of Gravity ◽  
Vertical Landing

The Short SC.l is a small delta wing V.T.O. aircraft of about 7,800 lb. all-up weight. Its unusual feature is that it is provided with vertical thrusting engines to enable it to take-off and land vertically and to hover. It can also operate normally as a conventional aircraft.The nature of the aircraft introduces a number of problems in the design of the landing gear. The first of these is that all wheels must be fully castoring since a vertical landing may take place with a certain amount of drift in any direction. Another complication arises because of the possibility of landing with slight backward drift, it being necessary to move the main wheels aft when the pilot intends to make a vertical landing; if the wheels were left in the required rearward position for conventional take-off the elevator power would be inadequate to lift the nose of the aircraft. The landing gear is therefore provided with simple means for moving the wheels fore and aft by a small amount, to move the position of the main wheels in relation to the centre of gravity.

Design and dynamic analysis of landing gear system in vertical takeoff and vertical landing reusable launch vehicle

2018 ◽  
Vol 233 (10) ◽  
pp. 3700-3713
Author(s):  
Ming Zhang ◽  
Dafu Xu ◽  
Shuai Yue ◽  
Haifeng Tao
Keyword(s):  
General Scheme ◽  
Surface Friction ◽  
Launch Vehicle ◽  
Landing Gear ◽  
Gear System ◽  
Extreme Condition ◽  
Response Characteristics ◽  
Reusable Launch Vehicle ◽  
Vertical Landing ◽  
Vertical Takeoff

Landing gear system is a key part of the implementation of reusable vertical takeoff and vertical landing launch vehicle, where its buffing performance is directly related to the vehicle whether it can land safely or stably. According to the reusable launch vehicle general scheme, outrigger landing legs are designed, and the hydraulic absorber is used for the landing gear system. Meanwhile, a scaling principle prototype of landing gear system is developed, and the landing impact test is carried out. A dynamic simulation model of the landing vehicle has been set up, researching the influence of parameters, such as the horizontal velocity, initial inclination, surface friction coefficient, and pitch angular velocity on the landing performance. Four kinds of extreme conditions are identified, and dynamic response characteristics of landing system under each extreme condition are conducted. The simulation results are in good agreement with the experimental data. The buffing performance of the vehicle meets the design requirements, which provides a reference for the design of landing gear system of the vehicle.

scholarly journals THE OPTIMAL PRINCIPLE OF BELLMAN IN THE PROBLEM OF OPTIMAL MEANS DISTRIBUTION BETWEEN ENTERPRISES FOR THE EXPANSION OF PRODUCTION

2019 ◽  
pp. 132-138 ◽  
Author(s):  
A. Tarasenko ◽  
I. Egorova
Keyword(s):  
Dynamic Programming ◽  
Nonlinear Programming ◽  
Optimal Solution ◽  
Optimal Distribution ◽  
Optimality Principle ◽  
Numerical Example ◽  
Maximum Profit ◽  
Cost Forecasting ◽  
Method Of Dynamic Programming ◽  
Minimum Costs

The method of dynamic programming has been considered, which is used in solving multiple problems in economics, on the example of using Bellman’s optimality principle for solving nonlinear programming problems. On a specific numerical example, the features of the solution have been shown in detail with all the calculations. The problem of optimal distribution of funds among enterprises for the expansion of production has been formulated, which would give the maximum total increase in output. The solution of the task has been presented in the case, when the number of enterprises is 3. It has been shown, that the Bellman optimality principle allows you solve applied problems of cost forecasting with obtaining the optimal solution-maximum profit at minimum costs.

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