The presented FBM is efficient to analyze the acoustic scattering effects of the helicopter fuselage and predict the acoustic noise field, taking both the rotor and the fuselage into account. In addition, the acoustic scattering effects of the same type of fuselage but with different length, width and height ratios are also compared for discovering the influences of the fuselage size. According to the discovery that helicopter fuselages with sharp edges can bring more significant acoustic scattering effects, a research on the influence of radius of curvature (RC), which reflects the sharpness of fuselage sharp edges, is also carried out. In this paper, different fuselage models are adopted for the comparisons of the acoustic noise scattered by different types of fuselages. For the accuracy of acoustic noise prediction and the research on the scattering affections of the helicopter fuselage, an FWH–BEM Method (FBM) based on convective FW–H equation and boundary element method (BEM) is presented for the prediction of the noise scattering effects of helicopter fuselage and the approach to the calculation of a helicopter’s acoustic noise field. * Corresponding author: main acoustic noise source of helicopters is supposed to be the rotor blades, but the scattering effect of the helicopter fuselage sometimes cannot be ignored. With special USB 11.1v lithium battery charger with charge balance and charge stability function.Beihang University, 100191 Beijing, China It has the functions of preventing overcharge, over discharge and low power indication, which can effectively prolong the service life of the battery.ġ3. Professionally customized high rate lithium polymer 11.1v 1450mah 25C battery, high discharge rate, long service life, flight time of about 9-12 minutes, normal use up to 500 + recycling. ![]() With standard six channel remote control, LCD display, power prompt, support digital parameter adjustment, support simulator function, optimize rocker output, and operate more finely.ġ2. The casing adopts hot runner injection molding process, high simulation details, good elasticity and toughness, which is not easy to be damaged.ġ1. With High precision CNC rotor head, swashplate to optimize the structure, reduce the weight and greatly reduce the probability of aircraft damage.ġ0. Using 2.4GHz communication protocol, the satellite receiver can be expanded to support DSMX, DSM2, PPM S-BUS system.ĩ. ![]() It has a stable, fast and accurate flight attitude, which is especially suitable for beginners.Ĩ. With the enlarged 4.3G metal digital steering gear, it has the characteristics of high torque response, fast precision, high return accuracy and response speed of 60 ¡ã / 0.05ms, making the aircraft fly accurately, feel better and last longer.ħ. The tail lock motor uses a special 1104 5200kv brushless motor, which has the characteristics of high temperature resistance, fast response, stable tail lock and not easy to be damaged after working for a long time.Ħ. The special high temperature resistant magnetic steel can withstand 150 ℃ high temperature without damage and improve service life.ĥ. It has the characteristics of low noise, high torque, sufficient power and high efficiency. Using 4006 630kv brushless motor self stable co-drive is used to reduce gear agitation. The blade is made of Nylon and carbon fiber composite material, with high strength, good toughness, impact resistance, no deformation and durability.Ĥ. It has high efficiency, power saving and long flight time. The propeller is designed based on aerodynamic principle to provide strong power and body self stability. It adopts flybarless design, double shaft driving motor and electronic stability enhancement system, which makes the hand feel more accurate, the flight more stable, optimizes the structure and reduces the probability of damage.ģ. With high simulation appearance details, cool lights, left and right movable side door, and shock absorber of landing gear.Ģ. UH 60 Black Hawk helicopter with 47:1 scale. 1 X 2.4G LCD 6CH radio control Transmitter Ĥ. 1 x Blackhawk RTF RC Helicopter (Ready to Fly,including: 3-axis gyroscope、ESC、Mixer、2.4GHz receiver) Ģ. Separating canopy design,easy to assemble and easy to maintain.ġ. High-performance brushless motor,long operating life and strong power. 3-Gyro,flybarless balanced electronic control system. 4 Blade structure,more effective and more stable. ![]() ![]() UH-60 Blackhawk Realistic scale model rc heli Product material: high-strength composite materialīody battery: LI-POLY smart battery 11.1V (1450MAH) 30C Remote control distance: more than 120 meters UH-60 Blackhawk RC Helicopter (remote control flying drone, stealth helicopter bin laden, rc pilot figures)
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |