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Lin C.-L.,Nanjing University of Aeronautics and Astronautics | Wang Y.-F.,Shanghai Aircraft Design and Research Institute | Wang H.-W.,Tsinghua University | Chen R.-L.,Nanjing University of Aeronautics and Astronautics | Shang X.-D.,Harbin Aircraft Industry Group Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

The steady-state response of a helicopter rotor in flight was solved by using a comprehensive aeroelastic analysis program. The result is then used as an initial state of a bird impact on the blade. The dynamic equation of helicopter rotor blade under bird impact was established by adopting non-linear fluid-solid coupling algorithm. Then the dynamic response of blades was solved by using direct numerical integration method. To provide some theoretical basis for the design of anti-bird-impact helicopter blade, the system parameters such as bird speed, bird quality, impact location, blade root constraint and rotating speed were discussed.

Shi S.,Nanjing University of Aeronautics and Astronautics | Shi S.,Harbin Aircraft Industry Group Co. | Tu B.-F.,Nanjing University of Aeronautics and Astronautics | Tu B.-F.,Collaborative Innovation Center for Advanced Aerospace Engine
Hangkong Dongli Xuebao/Journal of Aerospace Power | Year: 2016

To study stall inception of the axial flow compressor, full-annulus numerical simulation in the first stage of a two-stage low-speed axial flow compressor was presented. Results showed that there existed a kind of velocity fluctuation in the circumference scale in stall inception, which was closely related to the uneven boundary layer separation that first happened on the suction of stator blade rows. With further throttling of the compressor, the fluctuation amplitude increased gradually, and eventually it induced several rotor channels to generate serious boundary layer separation, blocking these channels. The compressor system led to the rotating stall condition. The rotational stall frequency with full development had good coincidence with the experimental result. © 2016, Editorial Department of Journal of Aerospace Power. All right reserved.

Cui G.-B.,Harbin Institute of Technology | Li Y.-J.,Harbin Institute of Technology | Dong L.,Harbin Aircraft Industry Group Co.
Proceedings of the International Conference on E-Business and E-Government, ICEE 2010 | Year: 2010

Tacit knowledge exists in knowledge workers in enterprises. To enable full sharing, reasonable knowledge sharing incentive and restraint mechanisms should be designed to accelerate spontaneous behaviors of employees so that it can improve the ability of innovation and competitiveness. According to principal- agency theory, and taking into account incomplete information of knowledge sharing, multi-stages incentive model of knowledge sharing for knowledge worker, and incentive model of knowledge sharing for knowledge team based on team sharing interests are proposed. The results indicate that, in order to acquire maximum rewards in enterprise, special incentive contracts are to be made for different knowledge main-bodies, optimal incentive decisions to meet enterprise own objective are to be made, and knowledge body's knowledge sharing effort is to be improved. © 2010 IEEE.

Yu X.-M.,Harbin Engineering University | Yu X.-M.,Harbin Aircraft Industry Group Co. | Tang L.-Q.,Harbin Engineering University | Wang K.,Harbin Engineering University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2010

To study characteristics of the damage field caused by explosions in geological materials, a spherical cavity model under internal pressure was created. An initial damage constitutive equation for geological-material was constructed. It used continuous medium damage mechanics to incorporate a free energy function into a damage variable. Then, a control equation for spherical cavity expansion was given, and the boundary conditions for solving the problem were obtained using an initial damage concept. In this way a damage field could be obtained by numerical analysis. Finally, the impact of initial damage and the material's damage index on damage scope were analyzed. Results showed that the damage internal variable as well as stress-strain field in the damage zone was continuous only within a certain range. Beyond this, some new constitutive equations had to be constructed to describe these materials. Therefore, the size of the damage field was connected with both material properties and initial damage. Only when considering these factors synthetically could we thoroughly understand the mechanics of deformation of geological materials.

Zhang H.B.,Northeast Dianli University | Chang Y.,Northeast Dianli University | Zhang R.J.,Northeast Dianli University | Fan H.Y.,Harbin Aircraft Industry Group Co.
Applied Mechanics and Materials | Year: 2013

Reverse modeling of vehicle suspension control arm is studied. Firstly, the data of vehicle suspension control arm is acquired. Secondly, the scanning point cloud data is processed. Then 3D model of vehicle suspension control arm is reconstructed. Finally, model's deviation is analyzed to find out the deficiencies and to improve the accuracy of the model. Reverse modeling based on CATIA can make up the shortage of traditional modeling method and solve the problem of gaining the data of complex curved surface parts. It also can shorten the innovation and improvement cycle of the vehicle suspension control arm and reduce the production cost and enhance enterprise competitiveness. © (2013) Trans Tech Publications, Switzerland.

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