圆板及环板动力响应计算的一种方法

本文将有限条法与结构动力响应计算的迁移子结构法相结合，提出了弹性圆形及环形薄板在任意激振力作用下动力响应计算的一种新方法，其中时域数值分析采用Ｗｉｌｓｏｎ－θ法，此方法不仅可以节省内存，计算精度比有限元高，而且适合实际应用。     

滑阀式真空泵的动力分析与动平衡

本文对滑阀式真空泵进行动力分析和动平衡，给出相应的计算方法和计算机程序。应用这种方法，可获得加在泵上最小二乘意义下的最佳配重，该法在某种滑阀泵上实施以后，使泵振动有明显地下降。理论分析与计算     

广义特征值问题的EBE－Lanczos并行算法

本文利用ＥＢＥ策略和ＰＣＧ法，将广义特征值问题Ｌａｎｃｚｏｓ法中各步的计算都单元化，从而避免了总刚度矩阵的组集而大大节省了存储量。同时，由此建立的ＥＢＥ－Ｌａｎｃｚｏｓ方法尤其适宜于并行计算。在银河－Ⅱ机上的数值试验结果表明无论是串行、还是并行计算，ＥＢＥ－Ｌａｎｃｚｏｓ迭代法都能有效提高计算速度。如对模型问题，若网格取２４×２０，则在串行计算时，ＥＢＥ计算途径较传统的总体计算途径的速度提高倍数达３．１４，而在并行计算时，并行的ＥＢＥ计算途径（挂用４个处理机）较串行的总体计算途径的速度提高倍数可高达１１．　４。总之该方法为一种有效的大型工程结构动力分析问题的求解方法。     

广义特征值问题的EBE－Lanczos并行算法

本文利用ＥＢＥ策略和ＰＣＧ法，将广义特征值问题Ｌａｎｃｚｏｓ法中各步的计算都单元化，从而避免了总刚度矩阵的组集而大大节省了存储量。同时，由此建立的ＥＢＥ－Ｌａｎｃｚｏｓ方法尤其适宜于并行计算。在银河－Ⅱ机上的数值试验结果表明无论是串行、还是并行计算，ＥＢＥ－Ｌａｎｃｚｏｓ迭代法都能有效提高计算速度。如对模型问题，若网格取２４×２０，则在串行计算时，ＥＢＥ计算途径较传统的总体计算途径的速度提高倍数达３．１４，而在并行计算时，并行的ＥＢＥ计算途径（挂用４个处理机）较串行的总体计算途径的速度提高倍数可高达１１．　４。总之该方法为一种有效的大型工程结构动力分析问题的求解方法。     

厚板动力分析的混合状态Hamiltonian等参元

本文提出一种对板动力学问题Ｈａｍｉｌｔｏｎ正则方程进行正则变换的方法，并给出一种强有力的半离散半解析方法—混合状态Ｈａｍｉｌｔｏｎ动力元。这种方法滑板厚方向未作任何有关应力和位移的人为假设，而是采用状态空间法给出真解，所以可通用于薄、厚板及强厚板的动力计算问题。     

重力坝与水、地基动力耦合系统地震反应的时域分析

本文采用动力特解边界元法在时域内求解坝－水－地基动力相互作用问题特性．研究了坝体、地基和系统阻尼对坝体的动力特性、动水压力、动力放大系数及稳定系数的影响．结果表明本文方法可方便处理坝、水和地基的动力耦合问题，减少大量计算工作量，并具有较好的精度．     

聚对苯撑亚乙烯/SiO2块状溶胶-凝胶光学材料制备的研究

介绍了一种由ｎ－共轭聚合物对苯撑亚乙烯均匀掺杂的块状二氧化硅玻璃复合材料。在实验中，我们采用溶液－凝胶技术（即Ｓｏｌ－ｇｅｌ技术）制备二氧化硅玻璃，并用Ｗｅｓｓｌｉｎｇ法制备出可溶于普通有机溶剂的聚对苯撑亚乙烯（ＰＰＶ）的预聚物。将制备得到的玻璃溶胶与ＰＰＶ的预聚物均匀混合，通过凝胶、发挥、加热等过程得到了聚对苯撑亚乙烯－玻璃块状复合材料，并在复合材料中添加有机玻璃使复合材料的加工性能得到大幅提高，从而获得具有良好光学品质的块状复合材料。我们运用ＳＴＭ、ＵＶ及ＩＲ对此复合材料进行物理表征。     

区间真值逻辑的代数结构

区间真值逻辑是一种模糊逻辑，其真值是由单位区间（０，１）中的数对组成，这一对数分别解释为某个问题的真度和含糊度，也可解释为对某个陈肯定度和拒绝度，Ｍｕｋａｉｄｏｎｏ在区间真值集上引入了两种序关系，一种是关于“真”，别一种是关于“含糊”。本文详细地讨论区间具值逻辑系统关于这两种序关系的代数结构，引入了一种新型代数系统－Ｉｎｔｅｒｖａｌ代数，最后讨论了区间真值逻辑函数。     

单边无限区间上五次样条插值的渐近展式及叠样条逼近

给出了单边无限区间上一类重要高次插值样条－－五次样条函数的逐项渐近展式，利用它可得到超收敛结果和进行外推等工作，另外还给出了一种高精度逼近导函数的方法。     

随机区间模糊混合参数结构可靠性分析

研究同时存在随机、区间、模糊变量的混合参数结构可靠性问题。利用广义密度函数法将模糊变量转化为当量随机变量,基于随机概率可靠性分析方法,获得概率可靠度指标表达式。考虑可靠度指标具有的区间性,利用区间数运算法则及区间截断法对所得可靠度指标区间进行计算、重置,获得混合参数结构可靠度区间表达。通过两算例验证该方法的可行性及有效性。     

石化炼油企业原油库存的动态管理

石化炼油是一个流程工业，原油的流动是连续的。为支持动态生产排产与调度的需要，对原油库存信息进行动态管理是非常必要的。这就要求原油库存管理能提供任何时刻的库存状态，这是一个极大的挑战。基于离散事件动态系统理论提出了一个有效的方法。通过这个方法，只需要记录本文中定义的时间与事件点的库存信息。通过这些信息，再经过一些有效地计算就可获得任何时刻的库存状态。这一方法是基于Window环境下实现的。     

Determination of dynamic fracture toughness for PMMA

A dynamic FEM (finite element method) and a strain gage method are applied to analyze the dynamic fracture toughness and SIF (stress intensity factor) for PMMA (polymethyl methacrylate). The analyses are carried out for plates with an edge crack subjected to one-point bending in a plane of the plate. A simple procedure that the present author has proposed is applied to the problem of using a triangular element of assumed constant strain on finite element analysis. The numerical simulation by FEM provides values for the applied forces as measured with the strain gages. Also, a crack initiation time is measured with the strain gage mounted around the crack tip. The dynamic fracture toughness is determined by adapting the crack initiation time to the simulation curve of the dynamic SIF calculated by the FEM. In this study, the usefulness of the method to determine the dynamic fracture toughness is investigated by comparing predictions with the experimental results for dynamic stresses and SIFs.     

随机参数梁在考虑热弹耦合下的动力响应分析

以随机参数梁为研究对象,分析其在温度载荷和力载荷共同作用并考虑热弹耦合关系时的动力响应。建立了热弹耦合动力学有限元模型,给出了在时间域内差分离散、相互交替迭代的耦合计算方法。利用随机因子法推导了结构温度场和动力响应的数字特征表达式,其中温度场的求解利用θ 时间积分法,动力响应则利用Newmark-β 积分法。在求出结构各时间步温度场和动力响应数字特征的基础上,应用耦合算法获得了整个时间域内的结构响应数字特征。通过悬臂梁算例分析了热弹耦合项对动力响应的影响,并考察了诸随机参数分散性对结构动力响应分散性的影响。     

基于改进烟花算法的传感器动态特性补偿方法研究

为了提高传感器的动态测量精度,提出了一种基于改进烟花算法的动态补偿器设计方法。依据传感器输入输出的动态标定数据,运用改进后的烟花算法逆向建模获取动态补偿滤波器,以改善原传感器系统的动态性能。经仿真实验测试,验证了该方法的可行性。将方法应用于科氏质量流量计变送器的动态补偿测试。实验结果表明,基于改进烟花算法的动态补偿方法可以有效提高科氏质量流量计变送器的动态特性,动态响应时间减小了将近90%。     

Dynamic temperature model and dynamic temperature compensation ofcrystal oscillators

In temperature-compensated crystal oscillators (TCXO), the compensating action is commonly estimated as a function of one variable-environmental temperature, At the same time, experimental data show that TCXO frequency stability is also dependent on the dynamics of the temperature process. The greater the temperature variation, the more pronounced Is the loss of temperature compensation. In this paper, the origins of this phenomenon are analyzed, and a method for reducing its effects is presented. A new approach is suggested according to which the compensating action is formed as a function of two variables: the temperature and the rate of its variation. A theoretical basis for this method is given. A functional model of the devices performing the dynamic temperature compensation is suggested. Experimental investigations of a TCXO with a microprocessor-based dynamic temperature compensation system confirmed the possibility of TCXO frequency stability improvement in nonstationary thermal conditions. In a system using an AT cut resonator and a separate Y-cut thermosensor, the application of dynamic temperature compensation resulted in an order of magnitude improvement as compared to conventional digital temperature compensation procedures. Even with dual-mode SC-cut resonators, the application of dynamic temperature compensation is shown to be useful     

Stress analysis of the rails of a new high velocity armature design in an electromagnetic launcher

In an electromagnetic launcher, the magnetic field creates a dynamic force that moves the armature forward. In an electromagnetic launcher, the armature reaches a critical velocity during the launch which causes high amplitude stress and strain. In addition, high stress and strain damage the rails and reduces its life span. The purpose of this paper is to investigate the effect of armature velocity as well as the rails physical and geometrical properties on the dynamic response of the rails in an electromagnetic launcher. In this study the second moment of inertia of the rails cross-section, Young modulus, foundation stiffness and density of the rails are constant in location and time. In our formulation of governing non-linear differential equations, Maxwell equations and deflection equation are applied to the rails under dynamic loading. To solve the non-linear governing differential equations a finite difference method is utilized.     

Method of Time Series Similarity Measurement Based on Dynamic Time Warping

With the rapid development of mobile communication all over the world, the similarity of mobile phone communication data has received widely attention due to its advantage for the construction of smart cities. Mobile phone communication data can be regarded as a type of time series and dynamic time warping (DTW) and derivative dynamic time warping (DDTW) are usually used to analyze the similarity of these data. However, many traditional methods only calculate the distance between time series while neglecting the shape characteristics of time series. In this paper, a novel hybrid method based on the combination of dynamic time warping and derivative dynamic time warping is proposed. The new method considers not only the distance between time series, but also the shape characteristics of time series. We demonstrated that our method can outperform DTW and DDTW through extensive experiments with respect to cophenetic correlation.     

Errors in dynamic calibration of thermoelectric transducers with differences between their thermal inertias

Conclusions The existing method of dynamic calibration of thermocouples can also be used for calibrating other thermal elements, for instance, thermistors, in which case a thermocouple or resistance thermometer should be used as a reference instrument. However, errors may be incurred in dynamic calibration if there is a difference between the thermal inertia of the reference and calibrated thermal elements. This circumstance limits the application of the dynamic method. This method is advantageous when it does not reduce the accuracy of calibration and provides a gain in calibration time as compared with the static method. The criterion of this gain is the ratio of the time spent on calibration by the static and dynamic methods.Analysis has shown that the dynamic method with air calibration and an error of 1° provides a gain in time from 1.5 to 40 for all the thermistors under consideration with the exception of types KMT-4 and MMT-4. For a given calibration error of 0.1° it is advantageous to calibrate by the dynamic method (either in air or in oil) only thermistors type KMT-14.It is possible by means of the nomogram provided in the article to determine the applicability of the dynamic method for calibrating thermal elements of a type or under static calibration conditions not covered by the article.     

An approach to the dynamic modelling of manufacturing systems

Because of their complexity manufacturing systems are difficult to model. However, modelling is very often required in order to study the behaviour of the system. In this paper an approach is described, where an analogy is drawn between the behaviour of a manufacturing and a mechanical system. Manufacturing systems have to respond to a dynamic demand, namely, a demand that changes over time. Flexibility of a manufacturing system can be thought of as the ability and the rapidness with which the system responds to the dynamic demand. This resembles the behaviour of a mechanical system under the excitation of a force that changes over time. The paper attempts to establish a modelling method based on this analogy and uses this method in the study of a real industrial system.     

A 3D implicit unstructured-grid finite volume method for structural dynamics

In this work, a new vertex-based finite volume method (FVM) using unstructured grids and cell-based data structure is proposed for computational analysis of two-and three-dimensional (2D/3D) general structural dynamic problems. The governing equations are spatially discretized by the FVM and an implicit dual time stepping scheme is employed to integrate the equations in time. The proposed method is applied to calculate deformations and dynamics of 2D and 3D cantilevers, as well as simply supported and clamped square plates. Computational results obtained are found to agree well with analytical solutions. It can be a viable alternative to the traditional finite element method (FEM) for structural dynamic calculations. And it can be seamlessly integrated into FVM-based Computational Fluid Dynamics (CFD) solver for simulating fluid-structure interaction (FSI).