基于MATLAB的煤质元素分析通用计算模型研究

在研究元素分析和工业分析指标相关性的基础上,利用MATLAB对全国126个矿井的无烟煤煤质分析数据进行了多元线性逐步回归分析,推导出了元素分析和工业分析关联方程组和关联矩阵,并对其进行了验证,从而实现了由工业分析指标对元素分析指标的通用计算模型.新模型将关联矩阵推广到全国范围内无烟煤的使用,具有一定的实用价值.     

ANSYS在机车车体结构设计中的应用

通过介绍某机车车体详细的有限元模型,描述了对车体结构分析的基本过程。并明确了车体有限元分析的主要影响因素以及对车体结构分析的基本步骤,为利用ANSYS对机车车体结构分析提供了参考依据。     

基于贝叶斯网络的燃油控制系统人因安全性定量分析

通过分析概率安全评价对人因安全性分析的本质需求,比较第一代和第二代人因可靠性分析方法,运用基于人的认知过程分析的安全性分析方法对概率安全评价中的人因事件进行计算分析,并针对传统事件树、故障树分析方法的局限性,采用了贝叶斯网络方法使得整个分析评价过程方便、有效。最后对燃气轮机燃油控制系统进行建模,并选取三种情境进行模拟和灵敏度分析,对相应的结果进行分析讨论,找出了安全性薄弱环节并提出相应的对策。     

基于小波包的泵站机组振动信号特征分析

提出了一种应用小波包分析对泵站机组振动信号进行特征分析的方法。与小波分析相比,小波包分析能对信号的高频频带进一步分解,提高了频率分辨率。利用小波包对泵站机组振动信号进行了信号压缩与消噪以及奇异性分析,为诊断机组振动故障提供了决策依据。对泵站机组主轴摆度和轴承振动实测信号进行了分析,结果表明小波包分析可有效提取原始信号的特征。     

基于ANSYS的50t电弧炉倾动平台结构分析与优化设计

利用ANSYS对倾动平台进行形变及应力分析,通过平台在实际使用过程中所出现的问题验证仿真分析结果的正确性。对结果进行分析,提出优化倾动平台结构的措施,并对优化结构进行ANSYS分析验证其可靠性。     

1P68F消声器分析

本文利用UGNX2.0软件对通用小型汽油机IP68F消声器进行了精确建模,采用声学分析软件Sysnoise对其声学特性传递损失进行了分析,同时应用流场分析软件Fluent对其空气动力学特性进行了分析,为指导消声器设计提供了有力的依据.     

太阳能集热器热性能动态测试方法研究

对太阳能集热器热性能动态测试方法进行了介绍,并对该方法的数学模型进行了分析;探讨了各项参数在方程中的作用、可以忽略的条件等;分析了稳态测试方法严格规定试验条件的必要性及原因,并对方程的数值求解进行了分析与推导。对同一台太阳能集热器分别进行动态和稳态测试方法的试验数据进行了不确定度分析,对试验结果进行了分析和对比,并分析了太阳能集热器效率曲线截距的差异以及在不同归一化温差处集热器瞬时效率曲线差异的深层次原因。     

贮料罐有限元疲劳分析

用有限元分析的方法对贮料罐进行疲劳分析,并对分析结果进行评定。     

冷凝器管板有限元分析及疲劳分析

用有限元分析的方法对冷凝器进行疲劳分析,并对分析结果进行评定.     

不同网格划分对机体有限元模态分析结果的影响

利用有限元对柴油机机体进行不同网格数量划分的模态分析,通过分析对比,得出了不同精度和不同网格划分数量对模态分析结果的影响,为其他同类结构的模态分析提供了理论依据.     

DISCONTINUITIES IN GENERALIZED THERMO-VISCOELASTICITY UNDER FOUR THEORIES

A model of the equations of generalized thermoviscoelasticity for isotropic media is given. The formulation is applied to the generalized thermoelasticity theories—Lord–Shulman, Green–Lindsay, and Chandrasekharaiah and Tzou—as well as to the dynamic coupled theory. The state-space approach is adopted for the solution of the one-dimensional problem of plane distribution of heat sources. The Laplace transform technique is used. The expansions of the stress component, the temperature increment, and the displacement, in Laplace transform domain, in power series, and the exact inversions for arbitrary time, are given. The jump discontinuities are calculated for the four theories and the kinematic conditions of compatibility are verified. Numerical results are given and illustrated graphically by employing the numerical method for the inversion of the Laplace transforms. Comparisons are made with the results predicted by the four theories.     

Review of theory of distortion and disintegration of liquid streams

Linear and nonlinear analyses of the instabilities and distortion of liquid streams injected into a gaseous media are discussed. The various fundamental mechanisms and the predictive capabilities for the distortions are emphasized. Round jets, planar sheets, annular sheets, and conical sheets are discussed in detail. The balance between capillary and inertial forces is primarily examined. The method for simplifying the analyses in the case of thin liquid sheets is discussed. The capabilities for representing the droplet size distribution that follows the stream disintegration are outlined.     

无心感应熔铜、铝炉用耐火材料

介绍了熔炼铜、铝及其各自合金的无心感应炉用新型干式成型耐火材料的研制、性能和使用情况。该材料成本低,成型工艺简便,使用寿命长。     

Potential method in the theory of thermoviscoelastic mixtures

In this article, the linear theory of binary thermoviscoelastic mixtures is considered and the basic boundary value problems (BVPs) of steady vibrations are investigated. Namely, the fundamental solution of the system of equations of steady vibrations is constructed explicitly and its basic properties are established. Green’s second and third identities are obtained and the uniqueness theorems for classical solutions of the internal and external basic BVPs of steady vibrations are proved. The surface and volume potentials are constructed and their basic properties are given. The determinants of symbolic matrices are calculated explicitly. The BVPs are reduced to the always solvable singular integral equations for which Fredholm’s theorems are valid. Finally, the existence theorems for classical solutions of the internal and external BVPs of steady vibrations are proved by the potential method and the theory of singular integral equations.     

水煤浆与其它燃料的火焰特性的比较研究

在开发和设计水煤浆锅炉的基础上 ,对水煤浆的燃烧特性和火焰特性作了深入地探讨 ,并把水煤浆跟常用的煤粉、重油、天然气 3种常用锅炉燃料的燃烧特性进行了比较 ,同时分析了同一锅炉在燃用不同燃料时出现的不同辐射特性的原因。研究结果对水煤浆锅炉的开发与设计提供了可靠的理论依据。     

Energy and the state of nations

The mathematical conditions for the existence of macroeconomic production functions that are state functions of the economic system are pointed out. The output elasticities and the elasticities of substitution of energy-dependent Cobb-Douglas, CES and LinEx production functions are calculated. The output elasticities, which measure the productive powers of production factors and whose numerical values have been obtained for Germany, Japan, and the USA, are for energy much larger and for labor much smaller than the cost shares of these factors. Energy and its conversion into physical work accounts for most of the growth that mainstream economics attributes to “technological progress” and related concepts. It decisively determines the economic state of nations. Consequences for automation and globalization and perspectives on growth are discussed.     

降低CA498型柴油机排放的试验研究

论述了CA498型车用柴油机的排放控制方法及理论依据,进行了燃烧室、喷油器、喷油泵及气道的匹配试验,就这些因素对排放物的影响进行了分析,并确定了CA498型柴油机的优化匹配方案。十三工况的排放试验结果显示：通过优化匹配提高了CA498柴油机的性能指标,并使其整体排放水平达到了欧Ⅰ排放法规的要求,NOx、HC与CO的排放指标接近于欧Ⅱ限值。     

水平圆柱与平板下相变材料接触熔化的基本方程

讨论相变材料围绕水平圆柱与平板下各种形式的接触熔化过程，系统分析了压力与摩擦作用下熔化的基本特生和规律，推得不同驱动条件下接触熔化所应满足与遵循的基本方程，给出了求解这些方程的一般步骤，最后，指出有关文献中的错误。     

Effects of preprocessing method on TVOC emission of car mat

The effects of the mat preprocessing method on total volatile organic compounds (TVOC) emission of car mat are studied in this paper. An appropriate TVOC emission period for car mat is suggested. The emission factors for total volatile organic compounds from three kinds of new car mats are discussed. The car mats are preprocessed by washing, baking and ventilation. When car mats are preprocessed by washing, the TVOC emission for all samples tested are lower than that preprocessed in other methods. The TVOC emission is in stable situation for a minimum of 4 days. The TVOC emitted from some samples may exceed 2500μg/kg. But the TVOC emitted from washed Polyamide (PA) and wool mat is less than 2500μg/kg. The emission factors of total volatile organic compounds (TVOC) are experimentally investigated in the case of different preprocessing methods. The air temperature in environment chamber and the water temperature for washing are important factors influencing on emission of car mats.     

Overview of the modeling of lithium-ion batteries

简述了锂离子电池等效电路模型和电化学模型的研究进展。由于具有耗时短、技术开发效率高等优点,仿真模型被广泛应用于锂离子电池衰减机制分析、状态诊断及寿命预测。锂离子电池仿真模型主要包括等效电路模型和电化学机理模型。等效电路模型主要应用于锂离子电池荷电状态诊断。电化学机理模型主要应用于锂离子电池衰减机制分析和健康状态诊断,并为寿命预测提供技术支持。等效电路模型的结构过于单一,在锂离子电池寿命后期适用性降低。电化学机理模型结构复杂,计算量大,在线性应用能力较差。总结了现阶段常用的锂离子电池等效电路模型和电化学模型的建模原理及模型结构,阐述了每种模型在电池研究中的具体应用,并分析了其各自的优势及局限性。通过以上分析,并结合最新的建模理论,对建立具有高精度、高适用性锂离子电池仿真模型的研究方向进行了展望。