The prediction of projectile-target intersection for moving tank based on adaptive robust constraint-following control and interval uncertainty analysis

To improve the hit probability of tank at high speed,a prediction method of projectile-target intersection based on adaptive robust constraint-following control and interval uncertainty analysis is proposed.The method proposed provides a novel way to predict the impact point of projectile for moving tank.First,bidirectional stability constraints and stability constraint-following error are constructed using the Udwadia-Kalaba theory,and an adaptive robust constraint-following controller is designed considering uncertainties.Second,the exterior ballistic ordinary differential equation with uncertainties is integrated into the controller,and the pointing control of stability system is extended to the impact-point control of projectile.Third,based on the interval uncertainty analysis method combining Chebyshev polynomial expansion and affine arithmetic,a prediction method of projectile-target intersection is proposed.Finally,the co-simulation experiment is performed by establishing the multi-body system dynamic model of tank and mathematical model of control system.The results demonstrate that the prediction method of projectile-target intersection based on uncertainty analysis can effectively decrease the uncertainties of system,improve the prediction accuracy,and increase the hit probability.The adaptive robust constraint-following control can effectively restrain the uncertainties caused by road excitation and model error.

数字变革时代的学校设计

在数字变革时代,需利用数字技术进一步推进学校工作,并在教育使命的框架内,培养学生适应数字世界的技能。鉴于此,探讨数字变革时代如何进行学校设计具有重要意义。新冠疫情是学校数字变革的助推器。学校管理者与教职工在应对数字变革中发挥着重要作用,可以保障和推进学校工作的进一步发展。基于对持续、优化和创新三个方面的整合,通过学校设计行为模型,为数字教育、学习和学校设计提供理论框架。在实践检验和学校设计行动模型的基础上,提出前提、建议、概括性主张及其包含的主题范围。随后,根据经验水平和学校类型,对数字变革、学校和教育的关系进行解析,阐明学校领导自身专业化的各个方面,探讨数字化和行政管理的潜力,概述网络在数字化中的重要性,并倡导在数字变革方面要通过正确的方式做正确的事,逐步在持续、创新和优化之间取得平衡,以促进学校的高质量发展。

Electromagnetic buffer optimization based on Nash game

Aiming at the problem of unstable buffering process of electromagnetic buffer(EMB)under intensive impact load,a three-segment electromagnetic buffer is proposed.The inner tube and air-gap of EMB are divided into three segments.The finite element analysis and impact test results show that the resultant resistance force(RRF)curve has two hump-shaped peaks,which is the reason for the unstable buffering process.In order to stabilize the buffering process,a multi-objective optimization design method of EMB based on Nash game theory is proposed.Firstly,the optimization model is established by taking the two peaks of the RRF curve and the maximum buffer displacement as the optimization objectives.Secondly,the multi-objective optimization model is transformed into a game model by sensitivity analysis and fuzzy clustering.Then,a Nash equilibrium solution strategy of EMB Nash game model based on symmetric elitist information exchange is proposed,which integrates gene expression programming(GEP)surrogate model and genetic algorithm(GA)as an optimization solver.Finally,the Nash equilibrium of the game model is obtained.The results show that the smoothness of the RRF curve has been significantly improved,which proves the effectiveness of the game strategy.