Optimization of an Active Twist Rotor Blade Planform for Improved Active Response and Forward Flight Performance

摘要: Abstract A study was conducted to identify the optimum blade tip planform for a model-scale active twist rotor. The analysis identified design traits which simultaneously reduce rotor power of an unactuated while leveraging aeromechanical couplings tailor response blade. Optimizing minimum in forward flight provided 5 percent improvement performance compared rectangular tip, but reduced vibration control authority actuation by 75 percent. maximum increased 50 with little effect on performance. Combined and optimization resulted similar 3.4 flight. Background Active rotors have been studied as potential solution diverse range problems plaguing rotary-wing vehicles. Numerous analytical experimental studies encouraging results indicating that vibration, noise, performance, well other issues may be successfully addressed through use trailing edge flaps, gurney twist, concepts [1-11]. Some these also exposed limitations – inability current state-of-the-art actuators meet requirements necessary fully achieve benefits [11]. Volumetric constraints challenges operating rotating environment led considerable effort being dedicated maximizing actuator mechanical amplification actuators, surfaces, structures [12-16]. approach address aforementioned problem begins viewing from different perspective. Instead redesigning actuator, surface, etc., improve its deflections or application force provide more over (vibration, etc.), this examines how can designed input thereby required without stringent requirements. Previous work active-twist designs examined various structural parameters [17, 18]. Optimization structure positioning has performed [12, 13]. Finally, limited, pertinent, parametric examining sweep, taper, anhedral previously [19]. present will expand performing complex than considered previously. While there multiple previously, they aerodynamic some combination goals [20-23]. None specifically dealt improvements. ultimate goal is develop proof concept employing case study, general areas further research development.