基于嵌入和遥测的轮式自行火炮变速箱测试诊断研究

针对在有线连接的条件下无法实现轮式车辆变速箱带载荷测试的问题，提出基于嵌入式和遥测技术的变速箱性能检测新方法，包括系统硬件和软件设计等。嵌入式检测系统随车采集变速箱的状态信息，经特征提取后，反映变速箱工况的特征量通过无线数传模块发送给远端的信号分析单元，信号分析单元在提取变速箱故障特征的基础上，应用模糊聚类分析方法对变速箱工作状态进行识别。该方法由于充分利用了车辆行驶时的动态载荷，使得测试的振动信息更有代表性，可以反映更多的系统特性，能够提高轮式车辆变速箱的故障定位精度。     

自行火炮随动系统性能原位检测设备研制

针对新型自行火炮随动系统性能的快速检测需求,研制了一种原位检测设备。该设备不仅可以自动检测随动系统的电源、控制、反馈和连锁信号,而且能够自动输入激励信号,通过高精度数字式轴角变换器同步采集高低和方位角传感器输出的位置信息,经过数据分析处理后,可获得系统调速性能、调炮精度和调炮时间等性能指标。     

自行火炮固有频率特性实验研究

为了研究自行火炮结构动态响应规律,以轮式和履带式火炮为研究对象进行了全炮模态测试,得到了全炮的固有频率及其相应模态.通过对轮式与履带式自行火炮系统振型分析,可以得到如下结论:对于轮式自行火炮和履带式自行火炮,在低频范围内从低到高其固有振型依次为全炮俯仰、平动和横滚;对于本文所选试验对象,履带式自行火炮全系统俯仰、平动和...     

基于三角白化权函数的自行火炮作战效能评估

针对自行火炮作战效能评估问题,确定自行火炮作战效能评估因素,构建评价指标体系,运用层次分析法计算各指标权重系数,结合灰色理论中的三角白化权函数,建立自行火炮作战效能评估模型。并应用于实例,结果证明了模型的可行性和有效性,实现自行火炮作战效能的定量化评估。     

An Operational Modal Analysis Experimental Technique for Self-propelled Gun

The experimental modal analysis of the selected self-propelled gun was completed to obtain its modal frequency distribution and modes by using an operational modal analysis experimental technique.The result obtained by the method was compared with that obtained by the traditional method.It indicates that the two results are in good agreement.     

履带张紧力对火炮炮口扰动影响研究

以某履带式自行火炮为研究对象,分析了其运动特点,通过建立虚拟样机,研究了履带张紧力对炮口点运动的影响,研究结果表明：张紧力越大,火炮的重心越低;张紧力对火炮运动的影响可分为张紧和放松两种状态,在火炮发射过程中,张紧时炮口点的最大垂向位移一致、最大角速度一致,放松状态时也一致;张紧状态的峰值大于放松状态的峰值;在弹丸膛内运动时期,履带张紧力对炮口的运动也有影响,履带放松时,履带垂向速度波动比较大;炮口点角加速度随着张紧力的增大而减小;因此,为保证射击精度,在射击过程中应该使履带处于张紧状态,张紧力越大,射击精度越高。     

Emergent behavioural phenotypes of swarming models revealed by mimicking a frustrated anti-ferromagnet

Self-propelled particle (SPP) models are often compared with animal swarms. However, the collective animal behaviour observed in experiments often leaves considerable unconstrained freedom in the structure of a proposed model. Essentially, multiple models can describe the observed behaviour of animal swarms in simple environments. To tackle this degeneracy, we study swarms of SPPs in non-trivial environments as a new approach to distinguish between candidate models. We restrict swarms of SPPs to circular (periodic) channels where they polarize in one of two directions (like spins) and permit information to pass through windows between neighbouring channels. Co-alignment between particles then couples the channels (anti-ferromagnetically) so that they tend to counter-rotate. We study channels arranged to mimic a geometrically frustrated anti-ferromagnet and show how the effects of this frustration allow us to better distinguish between SPP models. Similar experiments could therefore improve our understanding of collective motion in animals. Finally, we discuss how the spin analogy can be exploited to construct universal logic gates, and therefore swarming systems that can function as Turing machines.     

自行高炮射击信息自动监测系统设计

为实现对自行高炮射击信息的自动快速感知,文章设计并实现了火炮射击信息自动监测系统。该系统采用传感器对射击中浮动机工作状态信息进行实时采样并通过分析,实现了对火炮技术性能与工作状态的全面掌握,为装备保障决策和作战能力评估提供了直接信息来源。     

Numerical simulations of self-propelled swimming of 3D bionic fish school

Numerical simulations of self-propelled swimming of a three dimensional bionic fish and fish school in a viscous fluid are carried out. This is done with the assistance of a parallel software package produced for 3D moving boundary problems. This computational fluid dynamics package combines the adaptive multi-grid finite volume method, the immersed boundary method and VOF (volume of fluid) method. By using the package results of the self-propelled swimming of a 3D bionic fish and fish school in a viscous fluid are obtained. With comparison to the existing experimental measurements of living fishes, the predicted structure of vortical wakes is in good agreement with the measurements. Supported by the Key Project of National Natural Science Foundation of China (Grant No. 10532040)     

自行走全液压载重车转向系统仿真与试验研究

阐述了采用负载敏感技术的自行走全液压载重车转向系统的设计,使用AMESim和MATLAB软件对转向系统进行了联合仿真,分析了液压系统的动态特性,采用带死区的PID控制策略。仿真结果表明,与常规PID控制相比,带死区的PID控制对载重车转向系统的控制效果更好,通过与现场试验所得数据相比较,仿真曲线与实测曲线基本吻合,验证了仿真模型的正确性和控制策略的可行性。