Electrical system of military vehicle is a typical parameterized nonlinear system where complicated bifurcations may exist and threaten its safe and stable operation. An algebraic criterion for Hopf bifurcation is pre...Electrical system of military vehicle is a typical parameterized nonlinear system where complicated bifurcations may exist and threaten its safe and stable operation. An algebraic criterion for Hopf bifurcation is presented briefly and applied to find Hopf bifurcation point of the electrical system with automatic voltage regulator(AVR) dynamics in military vehicle. Hopf bifurcation controllers are designed for this electrical system by using wash-out filter,linear feedback,nonlinear feedback and their combination. The linear feedback control makes the system bring Hopf bifurcation at preferable parameter,the nonlinear feedback control modifies the type of the bifurcation,and the wash-out filter enhances the system damping,thus,the Hopf bifurcation is eliminated and the electrical system stability is ensured. Simulation results show the controller's validity.展开更多
Aimed at the requirements for electric transmission system of a military tracked vehicle, the motor's design indexes were analysed and calculated. A model based on saturate inductance parameter of interior permane...Aimed at the requirements for electric transmission system of a military tracked vehicle, the motor's design indexes were analysed and calculated. A model based on saturate inductance parameter of interior permanent magnet (IPM) synchronous motor was brought forward by using finite element analysis. And its control strategy based on the largest running capability was studied also. The experiment results for a scale model show that the modelling method improves the model's accuracy, and the motor's control strategy is effective.展开更多
The world military situation in 2016was complex,military strategies of major countries undergoing profound readjustment,contest in emerging fields increasing and a new round of populism cropping up worldwide which res...The world military situation in 2016was complex,military strategies of major countries undergoing profound readjustment,contest in emerging fields increasing and a new round of populism cropping up worldwide which resulted in'Black swan events'happening one after another,major-country contest and geopolitical conflicts piling up and local展开更多
目的探讨负性情绪对军医大学学员风险决策和抑制控制的影响。方法2023-04~07月,在某军医大学招募124名学员,依据症状自评量表(symptom check list 90,SCL-90)的焦虑维度和抑郁维度得分,将两维度得分均位于前27%的学员纳入低负性情绪组(n...目的探讨负性情绪对军医大学学员风险决策和抑制控制的影响。方法2023-04~07月,在某军医大学招募124名学员,依据症状自评量表(symptom check list 90,SCL-90)的焦虑维度和抑郁维度得分,将两维度得分均位于前27%的学员纳入低负性情绪组(n=22),两维度得分均位于后27%的学员纳入高负性情绪组(n=23)。采用剑桥赌博任务(Cambridge gamble task,CGT)和Stroop色词任务分别评估两组被试的风险决策能力和抑制控制功能。结果在风险决策方面,高负性情绪组的决策质量小于低负性情绪组,决策时间大于低负性情绪组,组间比较差异均有统计学意义(t值分别为3.505、-2.410,P均<0.05);两组的风险调节差异无统计学意义(Z=-1.794,P>0.05)。在抑制控制方面,高负性情绪组的矛盾任务正确率和非矛盾任务正确率均小于低负性情绪组,组间比较差异均有统计学意义(t值分别为2.187、2.093,P均<0.05);两组学员的矛盾任务平均反应时和非矛盾任务平均反应时差异均无统计学意义(t值分别为1.222、1.288,P均>0.05)。结论虽然尚未达到情绪障碍的诊断标准,但是高负性情绪会对军医大学学员的风险决策和抑制控制产生损害。展开更多
基金Sponsored by Foundation for Science Research Development of Nanjing University of Science and Technology
文摘Electrical system of military vehicle is a typical parameterized nonlinear system where complicated bifurcations may exist and threaten its safe and stable operation. An algebraic criterion for Hopf bifurcation is presented briefly and applied to find Hopf bifurcation point of the electrical system with automatic voltage regulator(AVR) dynamics in military vehicle. Hopf bifurcation controllers are designed for this electrical system by using wash-out filter,linear feedback,nonlinear feedback and their combination. The linear feedback control makes the system bring Hopf bifurcation at preferable parameter,the nonlinear feedback control modifies the type of the bifurcation,and the wash-out filter enhances the system damping,thus,the Hopf bifurcation is eliminated and the electrical system stability is ensured. Simulation results show the controller's validity.
文摘Aimed at the requirements for electric transmission system of a military tracked vehicle, the motor's design indexes were analysed and calculated. A model based on saturate inductance parameter of interior permanent magnet (IPM) synchronous motor was brought forward by using finite element analysis. And its control strategy based on the largest running capability was studied also. The experiment results for a scale model show that the modelling method improves the model's accuracy, and the motor's control strategy is effective.
文摘The world military situation in 2016was complex,military strategies of major countries undergoing profound readjustment,contest in emerging fields increasing and a new round of populism cropping up worldwide which resulted in'Black swan events'happening one after another,major-country contest and geopolitical conflicts piling up and local
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