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A general method for closed-loop inverse simulation of helicopter maneuver flight

Chinese Journal of Aeronautics 2017年第6期30卷 1799-1808页

作者： Wei WU National Key Laboratory of Rotorcraft Aeromechanics College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

Maneuverability is a key factor to determine whether a helicopter could finish certain flight missions successfully or not. inverse simulation is commonly used to calculate the pilot controls of a helicopter to complete a certain kind of maneuver flight and to assess its maneuverability.A general method for inverse simulation of maneuver flight for helicopters with the flight control system online is developed in this paper. A general mathematical describing function is established to provide mathematical descriptions of different kinds of maneuvers. A comprehensive control solver based on the optimal linear quadratic regulator theory is developed to calculate the pilot controls of different maneuvers. The coupling problem between pilot controls and flight control system outputs is well solved by taking the flight control system model into the control solver. inverse simulation of three different kinds of maneuvers with different agility requirements defined in the ADS-33 E-PRF is implemented based on the developed method for a UH-60 helicopter. The results show that the method developed in this paper can solve the closed-loop inverse simulation problem of helicopter maneuver flight with high reliability as well as efficiency.

关键词： Closed-loop Flying quality Helicopters inverse simulation Maneuver flight

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NONLINEAR inverse simulation FOR THE MANEUVERING FLIGHT OF COAXIAL ROTOR HELICOPTERS

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Chinese Journal of Aeronautics 1997年第4期10卷 2-9页

作者： Cao Yihua (Institute of Aircraft Design, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China) G. Reichert (Technical University of Braunschweig, 38106 Braunschweig, Germany)

The maneuvering flight governing equations for coaxial rotor helicopters are established. By introducing induced velocity interference factor analysis, the coaxial rotor aerodynamic interference can be taken into account. With the combination of coaxial rotor helicopter control features and nonlinear inverse solution technique, the governing equations for maneuvering flight can be solved so as to determine helicopter control input, control force and moment, and helicopter body attitudes which are needed for performing the defined maneuver. Finally, as an example of this methods engineering application, the calculated results with level turn, lateral jink maneuvers are presented and simply analyzed.

关键词： helicopters rotor aerodynamics maneuvers flight inverse simulation

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Model-based assessment of muscle forces and strain distribution in the femur of Cabot’s Tragopans(Tragopan caboti)

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Avian Research 2023年第4期14卷 706-715页

作者： Xinsen Wei Zihui Zhang Institute of Geology and Paleontology Linyi UniversityLinyi276000China College of Life Sciences Capital Normal UniversityBeijing100048China

The hindlimbs play a crucial role in bird locomotion,making the biomechanical properties of the musculoskeletal system in these limbs a focal point for researchers studying avian ***,a comprehensive analysis of the mechanical performance within the long bones of hindlimbs during locomotion remains *** the present study,the strain and deformation of the femur of Cabot’s Tragopans(Tragopan caboti)were *** employed inverse simulation to calculate the force and moment of femoral muscles during mid-stance terrestrial locomotion and conducted finite element analysis to calculate femoral *** showed that during mid-stance,the femur experiences combined deformation primarily characterized by torsion,bending,and *** emphasises the importance of considering the influence of varying loads on bone adaptation when investigating bone form-function *** were found to play a significant role in offsetting joint loads on the femur,subsequently reducing the deformation and overall strain on the *** reduction enhances femoral safety during locomotion,allowing birds to meet mechanical demands while maintaining a lightweight bone ***,the *** caudalis significantly reduces torsional deformation of the proximal femur,protecting the vulnerable femoral neck from high fracture risk induced by rotation *** that the femur torsion during terrestrial locomotion in birds is associated with changes in hindlimb posture due to their adaptation to flight,the characteristics of *** caudalis may provide insight into the locomotor evolution of theropods and the origin of avian flight.

关键词： Cabot’s tragopan Femur Finite element analysis inverse simulation Muscle force Strain

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