DECOMPOSITION OF THE COMPLEXES OF ROTATIONAL AND UNSTEADY DERIVATIVES OF LATERAL AERODYNAMIC COEFFICIENTS AT LARGE ANGLES OF ATTACK IN ACCORDANCE WITH THE RESULTS OF FORCED-OSCILLATION TESTS

2012 ◽  
Vol 43 (1) ◽  
pp. 111-123
Author(s):  
Pavel Lvovich Sverkanov
Keyword(s):  
Forced Oscillation ◽  
Aerodynamic Coefficients ◽  
Derivatives Of

INVESTIGATION OF ROTARY AND UNSTEADY DERIVATIVES OF THE PITCHING MOMENT OF AN AIRPLANE MODEL USING A 2DOF FORCED OSCILLATION RIG

2013 ◽  
Vol 44 (4) ◽  
pp. 507-519
Author(s):  
Ivan Vasilyevich Kolin ◽  
Kazbek Fedorovich Latsoev ◽  
Vladimir Georgievich Markov ◽  
Viktor Konstantinovich Svyatodukh ◽  
Tamara Ivanovna Trifonova ◽  
...  
Keyword(s):  
Forced Oscillation ◽  
Pitching Moment ◽  
Derivatives Of

Aerodynamics analysis of the main rotor influence on the static stability of the gyroplane

2017 ◽  
Vol 89 (5) ◽  
pp. 663-670 ◽  
Author(s):  
Marcin Figat
Keyword(s):  
Dynamic Stability ◽  
Static Stability ◽  
Main Rotor ◽  
Aerodynamic Coefficients ◽  
Content Type ◽  
Flight Condition ◽  
Configuration Change ◽  
Stability Derivatives ◽  
The Impact ◽  
Derivatives Of

Purpose This paper aims to present the results of aerodynamic calculation of impact the main rotor on the fuselage and the tail of a light gyroplane. This kind of vehicle is a type of rotorcraft which uses a non-powered rotor in autorotation to develop lift and engine-powered propeller to provide the thrust. Both of them disturb the flow around the gyroplane body (gyroplane fuselage and tail) and influence on its static stability. The main goal of the presented research was to find the magnitude of this influence. To measure this effect, the main stability derivatives changes of gyroplane body were investigated. Design/methodology/approach The CFD analysis of the complete gyroplane was made. Computation was performed for the model of gyroplane which was equipped with the two sub-models of the main rotor and the engine-powered propeller. Both of them were modelled as the actuator discs. This method allows to compute the aerodynamic impact of rotating components on the gyroplane body. All aerodynamic analysis was made by the MGAERO software. The numerical code of the software bases on the Euler flow model. Next, the resulting aerodynamic coefficients were used to calculate the most important stability derivatives of the gyroplane body. Findings The result obtained by computation presents the change in the most important aerodynamic coefficients and stability derivatives of the gyroplane body caused by the impact of its main rotor. Moreover, the result includes the change of the aerodynamic coefficients and stability derivatives caused by change of the main rotor configuration (change of rotation rate and angle of incidence) and change of the flight condition (gyroplane angle of attack sideslip angle and flight speed). Practical implications Analysis of the main rotor impact will be very useful for evaluation of dynamic stability of the light gyroplane. Moreover, the results will be helpful to design the horizontal and vertical tail for the light gyroplane. Originality/value This paper presents the method of the numerical analysis of the static stability of the light gyroplane’s body. The results of analysis present the impact of disturbance generated by the rotating main rotor on the static stability of the gyroplane body. Moreover, the impact of the main rotor configuration change and the flight condition change on the static stability were investigated too. The evaluation of the gyroplane’s body static stability was made by the stability derivatives. The methodology and obtained result will be very useful for analysis of the dynamic stability of the light gyroplanes. Moreover, the results will be helpful during design the main components of the gyroplane like vertical and horizontal tail.

scholarly journals Measurement of Dynamic Stability Derivatives of Tailless Lamda-shape UAV using Forced Oscillation Method

2016 ◽  
Vol 44 (7) ◽  
pp. 552-561
Author(s):  
Kwangjin Yang ◽  
Hyoungseog Chung ◽  
Donghyun Cho ◽  
Eunhye An ◽  
Joonsoo Ko ◽  
...  
Keyword(s):  
Dynamic Stability ◽  
Forced Oscillation ◽  
Stability Derivatives ◽  
Derivatives Of ◽  
Oscillation Method

Physical Properties of TCNQ Salts with N-Methyl Derivatives of Pyridine

1982 ◽  
Vol 85 (1) ◽  
pp. 257-263 ◽  
Author(s):  
A. Graja ◽  
M. Przybylski ◽  
B. Butka ◽  
R. Swietlik
Keyword(s):  
Physical Properties ◽  
Methyl Derivatives ◽  
Derivatives Of
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