风储孤网系统小干扰稳定性分析研究

从电力系统运行的一般原理出发,开展风储孤网系统小信号稳定和动态稳定的研究,保障局部地区供电可靠性。基于特征值分析法和李亚普诺夫线性系统稳定性判据,对风储孤网系统小干扰稳定性问题进行了研究。提出风储孤网系统储能单元基于下垂控制模式的储能逆变器控制策略,并根据风储孤网系统各模块的控制策略建立相应的数学模型；基于特征值分析法进行风储孤网系统各模块数学模型的小干扰稳定性分析,并根据李亚普诺夫线性系统稳定性判据进行风储孤网系统的稳定性判断；基于MATLAB/Simulink仿真平台搭建风储孤网系统仿真模型,通过仿真验证了风储孤网系统能够实现稳定运行,与小干扰稳定性分析得出的结论一致。研究成果可为风储孤网系统的运行稳定性研究提供理论参考。     

GFRP铣槽加工铣削力及表面粗糙度研究

铣槽是复合材料较常用的机械加工形式之一。为研究玻璃纤维增强复合材料(Glass Fiber Reinforced Plastic,GFRP)铣槽加工中各加工参数对铣削力和表面粗糙度的影响,开展了以主轴转速、进给速度和轴向切深为因素的正交试验,研究铣削力和表面粗糙度的变化规律。并用Matlab软件对铣削力和表面粗糙度的试验数据进行回归分析,建立了铣削力和粗糙度的经验公式,最后通过试验验证铣削力和表面粗糙度经验公式的正确性。结果表明:轴向切深对铣削力影响最大,其次是主轴转速,进给速度对铣削力影响最小;主轴转速对粗糙度的影响最大,其次是进给速度,轴向切深对粗糙度的影响最小。试验结果与铣削力、表面粗糙度经验公式算得的数值对比,误差范围都在20%以内。     

Experimental method for and theoretical research on defect tolerance of fixed plate based on damage mechanics

An experimental method and a theoretical analysis based on continuum damage mechan-ics are applied for the defects tolerance of fixed plate. The defects type studied in this article is scratch, which i...     

Experimental method for and defect tolerance of fixed plate theoretical research on based on damage mechanics

An experimental method and a theoretical analysis based on continuum damage mechan- ics are applied for the defects tolerance of fixed plate. The defects type studied in this article is scratch, which is considered a typical defect on fixed plate according to the engineering practice. The general approach to the defects tolerance analysis of scratched fixed plate is presented. The method of fatigue life prediction for standard notched specimens has been established on the basis of continuum damage mechanics. For the purpose of obtaining the influence law of fatigue life in consequence of scratches, fatigue experiments of standard notched specimens and scratched specimens have been done. Evalu- ation of the fatigue life of scratched fixed plate has been carried out. And the value of scratch defects permissible to the condition of safety service life has been worked out. According to the results of the- oretical calculations, the fatigue experiment of scratched fixed plate has been performed. The outcome shows that the theoretical prediction tallies with the experimental results.     

基于热力耦合层合板雷击损伤特性分析

为研究复合材料层合板在雷电流作用下的烧蚀损伤力学特性,建立复合材料雷击热力耦合有限元分析模型,与文献实验结果对比验证模型的有效性。根据Hashin三维失效准则编写用户材料子程序,分别得出层合板雷击烧蚀区域周围出现的力学损伤、各层力学损伤分布以及首层在不同方向上的应力分布,分析得出层合板的烧蚀损伤随雷电流持续时间的变化规律。结果表明:由于存在较高的温度梯度,导致层合板出现较大的热膨胀应力,进而导致层合板内部产生各种力学损伤,即基体开裂、分层及纤维断裂;雷击电流施加时间、峰值电流与温度场均对层合板烧蚀面积产生较大的影响。     

不同喷铝参数对复合材料雷击防护性能模拟

为了研究复合材料不同的雷击防护(lightning strike protection,LSP)系统在雷电流作用下的损伤规律,对雷击损伤过程和烧蚀机理进行分析,建立复合材料层合板雷击防护的能量平衡数学模型。在此基础上,在ABAQUS中建立复合材料基准件、全喷铝和局部喷铝防护系统的碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)层合板电-热耦合有限元模型,和实验结果对比验证模型的有效性,对雷击烧蚀损伤特征进行分析,并引入雷击烧蚀损伤指数DI,得出三种不同模型在不同铝涂层厚度、不同峰值雷电流作用下的烧蚀损伤规律,并对两种不同的局部喷铝防护系统下复合材料的损伤特征进行对比分析。结果表明:雷击防护系统下复合材料的烧蚀损伤面积和铝涂层厚度关系进行函数拟合,两者均满足幂函数关系。     

液滴冲击移动液膜的数值研究

为了研究液滴冲击移动液膜问题,建立了三维不可压缩层流计算模型,基于耦合的水平集-流体体积法对两相界面进行追踪,探讨了液膜速度和厚度、液滴直径和速度对冲击移动液膜过程的影响。研究表明:液膜静止时,冲击结果是对称的,而液膜移动时,冲击结果变为非对称;液膜速度对冠上游生长具有增强效应,而对冠下游具有抑制作用,增加液膜速度冠的上游高度增加、下游高度减小,内径增加;液膜厚度增加,液膜与壁面的粘性损失减小,吸收冲击动能的能力增强,当无量纲液膜厚度小于1时,冠的上、下游高度均随着液膜厚度的增加而增加,否则相反;当无量纲液膜厚度小于0.5时,冠内径随着液膜厚度的增加而增加,否则反之;随液滴直径和速度的增大,冠的高度和内径均增加。     

Aerodynamic multi-objective integrated optimization based on principal component analysis

Based on improved multi-objective particle swarm optimization (MOPSO) algorithm with principal component analysis (PCA) methodology,an efficient high-dimension multiobjective optimization method is proposed,which,as the purpose of this paper,aims to improve the convergence of Pareto front in multi-objective optimization design.The mathematical efficiency,the physical reasonableness and the reliability in dealing with redundant objectives of PCA are verified by typical DTLZ5 test function and multi-objective correlation analysis of supercritical airfoil,and the proposed method is integrated into aircraft multi-disciplinary design (AMDEsign) platform,which contains aerodynamics,stealth and structure weight analysis and optimization module.Then the proposed method is used for the multi-point integrated aerodynamic optimization of a wide-body passenger aircraft,in which the redundant objectives identified by PCA are transformed to optimization constraints,and several design methods are compared.The design results illustrate that the strategy used in this paper is sufficient and multi-point design requirements of the passenger aircraft are reached.The visualization level of non-dominant Pareto set is improved by effectively reducing the dimension without losing the primary feature of the problem.     

运载火箭增压输送系统补偿器接头内高压成形

采用外径161mm、壁厚1．5mm的不锈钢激光焊管进行了补偿器接头的内高压成形实验研究，对成形后零件进行了测量，分析了内凹缺陷产生的原因，重点研究了轴向进给量对成形质量的影响。研究表明：轴向进给量小，圆角成形困难，成形区壁厚减薄量大；轴向进给量大，有利于成形圆角，成形区壁厚减薄量小，但轴向进给量过大，容易形成内凹现象。当轴向进给量在21．5—22．8mm间，能够获得外形尺寸与最小壁厚均满足设计要求的零件。