广义质量的空间算子代数描述

应用空间算子代数理论，研究机械多体系统广义质量的结构特点，研究表明广义质量可初步表示为：M＝HφMφ*H*，并进一步表示为：M＝[I＋HφK]D[I HφK]^*，其逆矩阵可表示为：M^-1＝[I－HψK]^*D^-1[I-HψK]。这种表示与牛顿第二运动定律和欧拉定律相互对应，具有简洁的数学表达和明确的物理意义，广义质量是正，反向动力学的重要参量，是联系旋量力和旋量加速度的桥梁，其理论依根源自通过旋量整合的牛顿第二运动定律和欧拉定律，即d^2β/dt^2=M^tT′，旋量加速度等广义质量的逆左乘旋量力，据此可形成对旋量加速度的高效递推算法，并为下一时刻的φ，H，P，D，G，K等参数的正向动力学计算作准备。     

大质量飞行器质心测量方法

详细介绍了大质量飞行器质心测量的多支点称重法,针对某大质量飞行器,提出了径向测量的改进方法,算例表明,改进方法极大地提高了系统的测量准确度,可以满足大质量飞行器高准确度质心的测量要求。     

钝体入水时的水下声场的测量

对钝体入水时的水下声场进行了深入研究。在水中大约30个不同的测点上，测量了入水时产生的水中激波(声波)的压力，从而获得了激波的空间能量分布及其传播速度的实验数据。     

太阳电池阵的铰链副刚度参数识别

为正确识别太阳电池阵铰链副的刚度参数,用形状简单、建模相对容易的有机玻璃板列阵不同状态下模态试验结果估计待识别参数的初始值,通过线性化目标函数,将参数识别归为易求解的数学规划问题,最终直接用商用有限元分析程序和数学软件实现参数识别。识别结果表明,理论计算值与试验结果基本吻合。     

泵试验的水温和水密度修正

介绍了泵闭式试验系统和相关标准对试验介质的要求,论述了泵试验对水温的控制要求,给出了常温清水的密度和饱和蒸汽压依随温度的拟合公式,对正确应用泵相似换算定律和水密度修正做了详细地阐述,结合发动机泵试验的特点,提出了经济的水温控制建议。     

楔形体入波浪水面数值模拟

数值模拟分析楔形体入波浪水面流体力学现象和运动姿态变化历程，为水上飞机在波浪水面起降提供技术和理论支持。基于有限体积法求解非定常雷诺平均Navier-Stokes（URANS）方程和SST k-ω湍流模型，结合整体动网格法的速度入口造波方法、阻尼消波法和流体体积（VOF）液面捕捉技术构造数值波浪水池，耦合三/六自由度模型，实现楔形体入线性规则波和不规则波的数值模拟。在楔形体入静水面算例验证的基础上，详细研究二维楔形体在线性规则波波峰、波谷、平衡位置-上行速度和下行速度处入水过程的受力特性和运动姿态变化。结果表明：速度入口造波方法的波浪数值解与理论解析解较吻合，偏差为1%；在二维楔形体入规则波过程中，楔形体所受垂向力和垂向速度变化趋势相同，对横向位移影响较小，其数值变化少于0.01；在平衡位置入水过程中，模型的滚转角和横向速度变化明显，其数值变化约为波峰、波谷位置处的8倍和10倍。分析原因：平衡位置处波浪内流速度变化较快，模型所受波浪力冲量较大，且楔形体两侧斜边与波浪的相互作用力也参与到模型的运动中。数值模拟二维楔形体在线性不规则波5个随机时间点入水及三维楔形体在波峰、平衡位置-上行速度处入水过程，其变化规律及形成原因与入规则波相似。     

Three-dimensional global simulation of multiple ICMEs’ interaction and propagation from the Sun to the heliosphere following the 25–28 October 2003 solar events

This study performs simulations of interplanetary coronal mass ejection (ICME) propagation in a realistic three-dimensional (3D) solar wind structure from the Sun to the Earth by using the newly developed hybrid code, HAFv.2+3DMHD. This model combines two simulation codes, Hakamada–Akasofu–Fry code version 2 (HAFv.2) and a fully 3D, time-dependent MHD simulation code. The solar wind structure is simulated out to 0.08 AU (18 Rs) from source surface maps using the HAFv.2 code. The outputs at 0.08 AU are then used to provide inputs for the lower boundary, at that location, of the 3D MHD code to calculate solar wind and its evolution to 1 AU and beyond. A dynamic disturbance, mimicking a particular flare’s energy output, is delivered to this non-uniform structure to model the evolution and interplanetary propagation of ICMEs (including their shocks). We then show the interaction between two ICMEs and the dynamic process during the overtaking of one shock by the other. The results show that both CMEs and heliosphere current sheet/plasma sheet were deformed by interacting with each other.     

Results from the study of an M7.6 flare and its associated CME

An M7.6 flare was well observed on October 24, 2003 in active region 10486 by a few instruments and satellites, including GOES, TRACE, SOHO, RHESSI and NoRH. Multi-wavelength study shows that this flare underwent two episodes. During the first episode, only a looptop source of <40 keV was observed in reconstructed RHESSI images, which showed shrinkage with a velocity of 12–14 km s⁻¹ in a period of about 12 min. During the second process, in addition to the looptop source, two footpoint sources were observed in energy channel of as high as ∼200 keV. One of them showed fast propagation along one of the two TRACE 1600 Å flare ribbons and the 195 Å loop footpoints, which could be explained by successive magnetic reconnection. The associated CME showed a mass pickup process with decreasing center-of-mass velocity. The decrease of the CME kinetic energy and the increase of its potential energy lead to an almost constant total energy during the CME propagation. Our results reveal that the flare and its associated CME have comparable energy content, and the flare is of non-thermal property.     

水/金属燃料发动机水滴蒸发非傅里叶效应研究

水／金属燃料发动机单液滴蒸发拟选用表面模型假设,为了验证此假设的正确性,采用了修正的傅立叶定律,并分析了其物理意义及适用范围。通过试验验证及分析计算,从理论上证明,表面模型假设适用于水／金属燃料发动机水滴内部的输运过程。