MG375-AW采煤机使用分析

针对MG375-AW采煤机在使用过程中所出现的牵引部水冷却器漏水、行走箱切螺栓、喷雾效果不好等问题,结合工作实践,进行了分析和研究,并找出了有效的解决方案,确保该机组在现场合理使用。     

非均匀复合材料板中剪切波传播的研究

基于弹性界层中弹性波干涉理论,采用有效介质法,研究了剪切波在非均匀、纤维随机分布复合材料板中的传播,得到了非均匀弹性介质内的有效波数。通过满足弹性有界层的上、下边界条件,得到了非均匀界层中的频散方程。作为特例,绘出了不同参数下板中的前四阶频散曲线。可以看出,非均匀弹性有界层中的频散曲线和均匀界层中的有很大不同。最后分析了纤维和基体特性比、纤维的体积份数以及板厚与纤维半径比对频散曲线的影响。     

机载多管火箭非满管射击试验方法研究

研究机载多管火箭非满管射击试验方法,为减少机载多管火箭密集度试验用弹量提供新的试验方法。应用发射动力学和多体系统传递矩阵法理论,基于等起始扰动思想,建立了机载多管火箭发射动力学模型、特征方程和动力响应方程,并应用随机整数规划方法,形成了减少机载多管火箭试验用弹量方法。针对某19管机载多管火箭,提出了6发连射的密集度试验方案,试验验证使密集度试验用弹量比常规试验方法减少了68.4%,节省了大量试验费用。     

两种桥梁振动控制方法的对比分析

介绍了两种多重调谐质量阻尼器（MTMD）的参数优化公式，并采用两种方法对车桥耦合振动中桥梁的竖向振动进行了控制。算例表明：其方法比现有的方法参数优化简单、减振率高，且方法中TMD参数相同，更便于设计生产。因此应采用该方法对桥梁竖向振动进行控制。     

基于免疫网络调节的改进遗传算法

借鉴生物免疫中的独特性网络调节理论,将进化个体对应为免疫系统中的抗体,群体适应度量作为抗原,提出了一种改进遗传算法,实现了个体群在群体收敛性和个体多样性之间的动态平衡的调整,模拟实验表明新算法的收敛性能更佳。     

A hybrid genetic algorithm and tabu search for a multi-objective dynamic job shop scheduling problem

In most real manufacturing environments, schedules are usually inevitable with the presence of various unexpected disruptions. In this paper, a rescheduling method based on the hybrid genetic algorithm and tabu search is introduced to address the dynamic job shop scheduling problem with random job arrivals and machine breakdowns. Because the real-time events are difficult to express and take into account in the mathematical model, a simulator is proposed to tackle the complexity of the problem. A hybrid policy is selected to deal with the dynamic feature of the problem. Two objectives, which are the schedule efficiency and the schedule stability, are considered simultaneously to improve the robustness and the performance of the schedule system. Numerical experiments have been designed to test and evaluate the performance of the proposed method. This proposed method has been compared with some common dispatching rules and meta-heuristic algorithms that have been widely used in the literature. The experimental results illustrate that the proposed method is very effective in various shop-floor conditions.     

海洋二号扫描微波辐射计冷空定标和地球物理参数反演研究

本文研究了海洋二号(HY-2A)扫描微波辐射计冷空定标方法和数据反演算法。针对HY-2A扫描微波辐射计对地观测和定标扫描的设计原理和观测几何,基于微波辐射计的对地观测数据修正进入冷空反射器的地球信号,建立地面观测亮温的冷空反射器权重系数矩阵修正冷空观测信号;基于海面温度、海面风速、水汽含量和云液态含量的微波辐射计辐射传输模型,计算HY-2A扫描微波辐射计不同条件下的各频率极化方式下的理论亮温,建立线性回归模型,拟合不同地球物理参数的反演系数,采用多元线性回归算法反演HY-2A微波扫描辐射计地球物理参数,对比国外成熟微波辐射计数据,得到产品精度。     

Hyperbolic heat-conduction equation. Mixed boundary-value problem

The integral representation of the exact solution of a mixed problem for a hyperbolic heat-conduction equation with the most general propositions within the framework of generalized thermomechanics has been obtained. The thermal state of a bounded medium with thermal effects at the boundary has been investigated numerically on a personal computer. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 82, No. 1, pp. 170–176, January–February, 2009.     

A Method for Automatically Establishing a Mathematical Model of Kinematic Analysis to a Planar Mechanism with a Multiple Joint and Prismatic Pair

A method for automatically establishing a mathematical model of kinematic analysis to a planar mechanism with multiple joint and prismatic pair is presented.The breadth(or depth) first search spanning tree can be obtained based on an adjacency matrix of the mechanism.Then the kinematic chain(or mechanism)’s basic loops can be obtained.On the basis of these basic loops,a mathematical model of kinematic analysis can be established and solved automatically.In the sense of a calculative mechanism,structural analysis of the kinematic chain relates to the kinematic analysis of a mechanism.Thus,an effective way is supplied to the given mechanism’s kinematic analysis for automatic modeling and solving,and a method is supplied to the structural type to optimize kinematic synthesis.     

Identification of stochastic loads applied to a non-linear dynamical system using an uncertain computational model and experimental responses

The paper is devoted to the identification of stochastic loads applied to a non-linear dynamical system for which experimental dynamical responses are available. The identification of the stochastic load is performed using a simplified computational non-linear dynamical model containing both model uncertainties and data uncertainties. Uncertainties are taken into account in the context of the probability theory. The stochastic load which has to be identified is modelled by a stationary non-Gaussian stochastic process for which the matrix-valued spectral density function is uncertain and is then modelled by a matrix-valued random function. The parameters to be identified are the mean value of the random matrix-valued spectral density function and its dispersion parameter. The identification problem is formulated as two optimization problems using the computational stochastic model and experimental responses. A validation of the theory proposed is presented in the context of tubes bundles in Pressurized Water Reactors.