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Zhenqian Hou,Xiaogeng Liang,Wenzheng Wang 한국항공우주학회 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1
For robust stability analysis of parameters uncertainty missiles, the traditional frequency domain method can only analyze each respective channel at several interval points within uncertain parameter space. Discontinuous calculation and couplings between channels will lead to inaccurate analysis results. A method based on the ν-gap metric is proposed, which is able to comprehensively evaluate the robust stability of missiles with uncertain parameters; and then a genetic-simulated annealing hybrid optimization algorithm, which has global and local searching ability, is used to search for a parameters combination that leads to the worst stability within the space of uncertain parameters. Finally, the proposed method is used to analyze the robust stability of a re-entry missile with uncertain parameters; the results verify the feasibility and accuracy of the method.
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Hou, Zhenqian,Liang, Xiaogeng,Wang, Wenzheng The Korean Society for Aeronautical and Space Scie 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1
For robust stability analysis of parameters uncertainty missiles, the traditional frequency domain method can only analyze each respective channel at several interval points within uncertain parameter space. Discontinuous calculation and couplings between channels will lead to inaccurate analysis results. A method based on the ${\nu}$-gap metric is proposed, which is able to comprehensively evaluate the robust stability of missiles with uncertain parameters; and then a genetic-simulated annealing hybrid optimization algorithm, which has global and local searching ability, is used to search for a parameters combination that leads to the worst stability within the space of uncertain parameters. Finally, the proposed method is used to analyze the robust stability of a re-entry missile with uncertain parameters; the results verify the feasibility and accuracy of the method.
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Xujing Yang,Xiangchen Lin,Maojun Li,Xiaogeng Jiang 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.12
The use of abrasive waterjet to cut CFRP laminates has been proved to be feasible with several advantages compared with traditional machining methods, while relatively poor surface quality and kerf taper impede its application in automotive industry. In this work, the influence of various process parameters including hydraulic pressure, cutting speed and stand-off distance on surface integrity and kerf characteristics was comprehensively studied. A statistical model was further developed using response surface method involving 17 trials. Statistical analysis found that higher level of cutting speed led to the decrease of kerf width and the increase of surface roughness. Based on optimizing the expected function of responses, the minimum taper error of 0.058 mm and superior surface roughness (Ra) of 3.58 μm were obtained. Furthermore, hybrid machining strategy integrating AWJ and CNC milling processes was proposed to cut CFRP laminate in order to obtain both high efficiency and superior surface quality. The depth of cut for post-milling process was set down to 0.1 mm. It was found that kerf taper was completely removed with relatively flat surface, and surface roughness (Ra ~ 1.20 μm) was reduced by up to 5.61 μm with an overall decrease of about 80%.
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Three-Dimensional Prescribed-Time Impulsive Pinning Cooperative Guidance
Wenhui Ma,Yangwang Fang,Wenxing Fu,Xiaogeng Liang 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.5
This paper studies the problem of multiple interceptors with intermittent communication cooperatively intercepting a stationary target. Given the difficulties in real-time online information transmission, a three-dimensional (3D) two-stage prescribed-time impulsive pinning cooperative guidance law (PTIPCGL) is proposed. It can achieve the simultaneous arrival of multiple interceptors based on the directed internal communication and impulsive pinning external communication. In the first stage, the PTIPCGL incorporates a time scaling function into the second-order impulsive pinning consensus to realize the desired convergence performance. Theoretically, the convergence time can be arbitrarily pre-specified and independent of tuning parameters. In the second stage, the switching occurs at the pre-specified convergence time, and the interceptors switch to pure proportional navigation (PPN) guidance with suitable initial conditions to achieve simultaneous arrival. Finally, numerical simulations demonstrate that the PTIPCGL exhibits satisfactory effectiveness and robustness under intermittent communication.
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