The steady solution of nonlinear ship motions in oblique seas can be gained by adopting the new technique presented in this thesis . this work promotes the application of theoretical prediction methods of nonlinear ship motions and wave loads 本文提出的新方法可以保证获得斜浪中船舶非线性运动的稳定的周期解,从而进一步完善了斜浪中船舶非线性运动预报和波浪载荷计算的工程实用方法。
On the basis of comparison of theoretical prediction with ansys results , the effect of the second moment is presented through regression analysis . the basis of the calculation and design of gap k - joints of r . h . s . trusses is provided 在与ansys对比分析的基础上得出卷边强化和由于节点偏心而产生的次弯矩对节点极限承载力的影响,拟合出节点极限承载力的计算公式,从而为节点计算和设计提供了依据
On the basis of analyzing insurance ' s inbeing , developing demands and national utility , the paper concludes that state ownership should be withdrawn gradually ; this conclusion is consistent with the theoretical prediction 然后进一步对保险制度变迁的现实需求进行考察,从保险性质、保险发展要求和国家效用等角度研究了当前保险改革的具体方向,得出保险国有产权垄断退出的结论,同理论预期取得应证。
The current dendritic growth theory is modified so as to be applicable to ice dendritic growth under high undercooling conditions . experimental measurements are in agreement with the theoretical prediction at small undercoolings but exhibit some deviations at large undercoolings due to systemic errors 实验测定了不同过冷度下冰枝晶的生长速度,并且改进了冰枝晶的生长理论,使之更符合大过冷度时的枝晶生长情况。
Presents the micro - mechanics analysis of three - dimensional multi - directional braided composites with microcracks using an equivalent inclusion method to predict thermal expansion coefficients for three - dimensional multi - directional braided composites with microcracks , which can be used to analyse thermal expansion coefficients of unidirectional fiber reinforced composites as well as three - dimensional braided composites with microcracks , and the thermal expansion coefficients of unidirectional fiber reinforced composites and four - directional braided composites , which enable the theoretical prediction to agree with experimental data very well 将三维编织复合材料的纤维束和微裂纹分别看作圆柱型和圆币型夹杂,考虑了微裂纹的任意取向和增强纤维束的空间取向,采用等效夹杂法对含微裂纹的三维多向编织复合材料的热膨胀系数进行了细观力学分析,提出了预报含微裂纹三维多向编织复合材料热膨胀系数的方法,由于直接考虑了微裂纹的任意取向和增强纤维的空间取向,这种方法既可应用于一般含微裂纹的三维编织复合材料,也可应用于单向纤维增强复合材料.结合实例分别预报了单向纤维增强复合材料和四向编织复合材料的热膨胀系数,与实验结果吻合较好
Abstract : a previously proposed approximate quasi - static theoretical method is employed herein to examine the deformation and perforation of a simply - supported circular plate struck by a flat - faced projectile at normal incidence . based on the principle of virtual work , static load - displacement relationships are first obtained and then used to predict the energy - absorbing capacity of the plate subjected to relatively low speed impact . it is shown that good agreement is obtained between the theoretical predictions and the available experimental data , provided that adiabatic shear plugging failure does not occur , but the influence of strain rate sensitivity is taken into account 文摘:采用准静态近似理论方法分析简支圆板在平头弹丸正撞下的变形和穿透.首先基于虚功原理得到了静态荷载位移关系,并将其用于预测低速冲击下圆板的能量吸收能力.当考虑了材料的应变率敏感性,并且不发生绝热剪切冲塞破坏的前提下,理论预测和实验结果吻合良好
The rapid and reversible change between fluid and solid enables erf potential applications in mechatronic devices , cars and general machines . the transmission ability of a self - made cylinder coupling with zeolite - based erf was investigated , the torque transmission of the coupling in wide ranges of driving speed and electric field was measured . the relationship between the transmission torque , the zero field viscosity of erf and shear yield stress of erf under different electric fields was obtained and compared with theoretical prediction 本文用沸石和硅油配制的电流变液,在自制圆筒式联轴器上研究了在一定的速度范围和有无电场作用条件下测量了其扭矩传递能力,获得了传递扭矩与零电场电流变液粘度以及电场中电流变液的剪切屈服应力之间的关系,并与理论值进行了比较。
The advantage and disadvantage of measurement of propeller - induced pressure by using different equipment is discussed . the method to obtain self - propulsion point for full scale in depressurized towing tank is studied . the measurements of pressure of two propeller models are carried out , the results of the measurement agree with those obtained by cavitation tunnel very well , which proves this measurement is successful , and the theoretical prediction is verified too 比较了不同测试设备用于螺旋桨脉动压力测试的优缺点,探讨了在减压拖曳水池中实现实船自航点的方法,并进行了两只螺旋桨模型的脉动压力测试,经与空泡水洞中脉动压力的测试结果进行比较,说明该项测试是成功的,同时也对脉动压力的理论预报结果做了验证。
Based on our theoretical predictions , we find optimal splicing parameters on fsm - 30s fiber splicer for low loss joints between erbium doped fiber and other single mode fibers . we also experimentally demonstrate a novel three - stage erbium - doped fiber amplifier with high gain , low noise figure , and high output power . finally , a prototype of a gain - clamped fiber amplifier is obtained with high gain ( 26 db ) , low noise figure ( 5 . 3 db ) , high output power ( 17 dbm ) , and large bandwidth ( 31 nm ) 文章研究了掺铒光纤( edf )与其他光纤低损耗焊接问题,得到光纤熔接机低损耗熔接的最佳参数,这对掺铒光纤放大器的科研生产具有一定的指导意义;研究了新型的三段级联泵浦优配的掺铒光纤放大器的优化光路结构,得到高增益,低噪声,大输出功率的掺铒光纤放大器;最后研制成功高增益( 26db ) ,低噪声( 5 . 3db ) ,大输出功率( 17dbm ) ,宽带( 31nm )增益箝制掺铒光纤放大器样机。
An experimental apparatus has been set up start from scratch and some experiments have been done to study the heat transfer characteristics of the ice - on - coil tank . the comparison of the theoretical predictions and the experimental data has been made and the disagreements between them are also analyzed 建立了导热塑料蓄冰盘管传热性能测试装置,测试了结冰和融冰过程中载冷剂的进出口温度、流速和结冰或融冰时间的关系,通过实验结果与理论计算的比较和误差分析,验证了建立的数学模型的合理性。