Chaos and its control in the planar libration of a magnetic rigid spacecraft with internal damping in an elliptic orbit are investigated.
研究在具有内阻尼的磁性刚体航天器在椭圆轨道上平面天平动的混沌及其控制。
Chaotic planar libration and its control of a magnetic rigid spacecraft with internal damping in an elliptic orbit near the equatorial plane of the earth are investigated.
研究在地球万有引力场和磁场中具有结构内阻尼的磁性刚体航天器在近赤道椭圆轨道上平面天平动的混沌行为及其控制。
It was observed that the background of internal friction for some weak adhesives, e. g., phenyl salicylate, water glass mixture, etc. seems to be neither negligible nor constant value which is dependent on such factors as their temperature, thermal stress, time, dryness and strain amplitude, similar to that of dislocation damping.
对于水杨酸苯酯，水玻璃混合剂之类弱粘结剂所造成的背景内耗既不能忽略也不是常数，它与粘结层温度、热应力、时间、干燥程度和应变振幅等因素有关。
It has very little internal damping, which means that when you put energy into it in the form of a tap it抯 not dissipated away in heat and internal friction.
当你变为它把能源放在一个水龙头的形式it s里，不离开在热和内部摩擦中驱散的时候，它有意味着那个的非常小内部阻尼。
The damping characteristics of the laminate is investigated and it is revealed that there is an internal friction peak at about 50℃ in curves of i nternal friction vs temperature.
该材料在50℃附近有一内耗峰，当材料在常温下停放1年后，该峰消失，材料的常温阻尼能力随之降低。
A neural network based internal model controller is designed to deal with the nonlinearlity and time-variety of the gain in the control strategy. The control strategy is applicable to different operation models of the SVS system. A neural network-based fuzzy adaptive PID control system is proposed for single area load frequency control. The control system fuses fuzzy logic and neural network and its control parameters are optimized dynamically on a selected object function. This overcomes effectively the impact of different power system operation model on generator inertia constant and load-damping constant. The impact of different frequency bias factor on the dynamic performance of twoarea load frequency control is studied in detail. Results show that it is necessary to determine the load-damping constant of each area dynamically. Consequently a neural network based fuzzy adaptive PID control system is designed for two-area load frequency control. The neural network learning algorithm in the control strategy is derived in detail.
在电力系统智能控制器的分析设计方面：针对静止无功补偿器基本控制方式中增益系数的非线性和时变性问题，设计了一种静止无功补偿器的神经网络自适应内模控制器，使静止无功补偿器的控制适用于电力系统各种运行方式的要求；针对传统负荷频率控制中等值发电机的惯性时间常数和负荷阻泥系数随电力系统的运行方式而变化的特点，提出了一种神经模糊自适应PID控制系统，采用模糊逻辑技术与神经网络相结合、通过动态寻优确定最优性能指标下的控制器参数，改善单区域负荷频率控制的动态性能；进一步设计了一种用于两区域负荷频率控制的神经模糊自适应PID控制系统，推导了这种控制系统中自适应神经网络的学习算法，对选定的性能指标，利用智能方法确定最优性能指标下的控制器参数以及频率偏差权重的动态值，使传统的电力系统负荷频率控制具有鲁棒性和自适应能力。
The internal damping of short aligned fiber reinforced composite caused by viscoelastic properties of constituent material is derived by using the Hshin's elastic-viscoelastic correspondence principle approach. The effects of fiber aspct ratio, interface material property and fiber end gap on damping are discussed and experimental data are presented for comparison with predictions.
应用Hashin推广了的弹性—粘弹性对应原理，我们导得了单向（0°度）短纤维增强复合材料由其粘弹性而引起的内阻尼，同时还分析了纤维长细比、界面层材料性质和纤维端部间距等因素对阻尼的影响并与实验结果进行了比较。
A method for in-line measuring the internal friction force of conticasting crystallizer includes such steps as using sensors to measure the force acting on crystallizer and the vibration shift of crystallizer, measuring and calculating the system parameters including mass, rigidity and damping, making the difference of obtained data relative to shift once or twice to obtain vibration speed and acceleration, using them in a mechanical vibration model, and calculating the friction force between the cooling wall of crystallizer and the cast billet while displaying it.
一种在线检测连铸结晶器内摩擦力的方法，其特征是：通过传感器测量作用在结晶器上的力和结晶器的振动位移；实测并计算出结晶器系统的质量、刚度、阻尼参数；连铸时，将计算出的系统参数，检测得到的作用在结晶器上的力和结晶器实际振动位移，对位移做一次和两次差分可分别获得结晶器振动速度和加速度，代入结晶器受迫振动力学模型，实时计算出连铸时每一采样时刻结晶器冷却壁与铸坯坯壳之间摩擦力，并将摩擦力变化趋势显示在显示器上。
It incorporates an internal pressure safety valve, a hydraulic refill controlled by the diaphragm and a protection valve blocking the overrunning and the extrusion of the diaphragm, along with an IMI system (Installation Monitoring Indicator) which makes it possible to check the progress of the hydraulic operation; detect any possible overpressure of the system or the presence of bad discharge conditions (such as pulsation dampener out, absence of damping and ensure diaphragm integrity.
它包括一个内置的施压安全阀，由横隔膜控制的水压填充装置和一个可以防止溢流以及横膈膜挤出的安全阀。另外还有IMI（InstallationMonitoringIndicator）安装监测指示系统。它可以实现对于水力操作过程的监测，能够察觉所有的系统超压危险，知晓劣质排放状态是否存在，比如，振动消除和阻尼的消失等，并且它可以保证横膈膜的完整性。
At last, natural frequencies of practical pre-stressed composite space truss are tested with pulsatory method on construction site and its damping ratio is calculated, which gives another important data for engineering design. In addition, through the model experiment of pre-stressed rectangular square pyramid composite space truss, the correctness of characteristics of internal force and the feasibility of tension recovery method are proved.
最后，在工程施工现场用脉动法测试自振频率，并借助于振动衰减曲线和半功率点法计算出预应力组合网架——钢与混凝土的混合结构体系——的阻尼比，此又为工程设计提供了一理论依据；另外，通过正放四角锥预应力组合网架的模型试验，验证了结构内力分布特点的正确性以及张力松弛法的可行性。
The results show that the free piston system has some unique features which are different from those of traditional Internal Combustion engines. It could be regarded as a forced vibration system with variable damping coefficient and stiffness. And the coefficients of damping and stiffness of the system are both positive. Its steady state response of periodical excitation is convergent which means that the system is stable under the periodical combustion.
研究结果表明，自由活塞式内燃发电机的活塞运动不同于传统旋转内燃机，它可视为变阻尼、变刚度的单自由度受迫振动，振动频率与外部周期性燃烧激励相关联，此外，由于该系统的等效刚度系数以及阻尼系数均为正数，它对周期性激励表现出的响应最终稳定收敛进而保障内燃机稳定运行。
The hydrodynamic forces on the large diameter cylinder in a two-layer fluid include not only the wave force, added mass and damping coefficient by produced the surface wave but the ones produced by the internal wave. This is different from the case of the uniform fluid.
与单层流体不同，对两层流体，作用在大直径圆柱体上的水动作用力，除了表面波模态的波浪力、附加质量和阻尼系数外，还有内波模态的波浪力、附加质量和阻尼系数。
Besides, with several supposed diesel piston cases, it involves the examination of the speed of heat transfer and permeation and damping of temperature wave on the combustion-chamber surface of the internal combustion engine.
并以柴油机活塞为例，考察了在几种假定情况下，内燃机燃烧室壁面热传播的速度以及温度波的渗透和衰减情况。
The internal dissipation of the polymer molecules is the mechanism for improvement of damping energy of ordinary concrete, and the friction on the interfaces between fibers and cement-based materials contributes to the damping of fiber reinforced concrete.
主要原因是聚合物分子在外力作用下的内耗增加了普通混凝土的阻尼能力，而纤维的阻尼增强机理在于纤维的掺入增加了纤维与水泥基材的界面摩擦力。
The operation mechanisms in the hybrid MMC were dislocation damping, Gr/Al interface micro gliding damping and interface internal friction at low temperature, and the interface sliding and dislocation movement dragging the point defects damping at high temperature.
表明混杂增强的MMC的最主要阻尼机制可以归结为：在低温下的位错阻尼机制、Gr/基体界面的微滑移和界面阻尼机制；
Internal damping of engineering material, such as steel and Reinforced Concrete (RC), is tested as a constant and the experimental results are too scattered to obtain the material damping values and changing law in theory.
工程材料，如钢筋混凝土材料阻尼的研究思想目前还一直停留在认为其为常数的阶段，基本上采用试验测量，结果分散，难以从理论上得到材料阻尼值及变化规律。
The influences of gyroscopic effect of the rotor, external and internal damping as well as the initial phase angle of static unbalance on the transient response are discussed.
文中讨论了转子盘的陀螺效应，静、动不平衡，内、外阻尼和静不平衡量的初相角等多种因素对瞬态响应的影响。
My company is bell south Nanchang Chemical Industry Ltd. unit (formerly JMC Chemical Industry Co., Ltd.) Our main products are: 1, vehicle vibration damping pad and insulation film series, mainly used in cars, driving from alternate space hot, noise, the role of shock absorber; 2, metal coating pre-treatment agent series, including series in addition to oil, rust agent, phosphating agent; 3, automobile radiator coolant advanced series, for the liquid cooling type internal combustion engine cooling system, from antifreeze, anti-boil, corrosion resistance, the usefulness of scale; 4, the company has other products: paint remover, anti-rust oil, cutting coolant, PVC sealant, aluminum chemical conversion agent, paint mist coagulant, waste water treatment agent. 5, ethylene glycol, such as the sale of chemical raw materials, cheap, quality assurance.
我公司是南昌南铃化学工业有限公司下属单位（原江铃化学工业有限公司）公司主要产品有：1、汽车用阻尼隔热垫和减振胶片系列，主要用于汽车、驾乘空间起隔热、隔音、减震的作用；2、金属涂装前处理剂系列，包括系列除油剂、除锈剂、磷化剂等；3、汽车用高级水箱冷却液系列，用于液冷式内燃机冷却系统，起防冻、防沸、抗蚀、阻垢的功用；4、公司其它产品有：脱漆剂、防锈油、切削冷却液、PVC密封胶，铝材化学转换剂，漆雾凝聚剂，废水处理剂等。5、公司出售乙二醇等化工原料，价格便宜，质量保证。
Effects of seal and internal damping on dynamic stability of liquid hydrogen turbopump rotor system in rocket engine
密封和内阻尼对火箭发动机液氢涡轮泵转子系统动力稳定性的影响
Temperature Dependent Internal Friction Characteristic and Solute Effect of High Damping Magnesium Alloys
高阻尼镁合金温度相关内耗特征及溶质影响