Avoid over-loading the joints during housework . for example, avoid using the same joint repetitively or carrying heavy loads . otherwise the soft tissues of the joints could be damaged easily 处理家务时要避免令关节过劳,例如避免重复使用单一个关节及提取过重物品,否则关节组织很容易受到破坏。
Pre-stressed steel structure can take full advantage of elastic strength of steel, furthermore, multi-pre-stressed steel structure can repetitively make use of the steel structure's elastic strength 对钢结构施加预应力可以充分的发挥钢材弹性范围内强度,而多次预应力可以反复的利用钢材弹性范围的极限强度,提高结构承载能力。
Have properties of standing high temperature and pressure, waterproof, antisepsis, preventing aging . they are convenient for cutting and making model . they can be used many times repetitively and are first selecting material in constructing bridge, building, nuclear power station and architecture industry 耐高温高压超强防水防腐防老化,便于切割做模,能多次重复使用,是桥梁高楼大厦核电站和建筑行业混凝土施工的首选材料。
So it can be used as one part of the industrial process control or a valuable associated software for analyzing and simulating control systems . iterative learning control based on the study of robotic control adjusts control input repetitively with simple learning control algorithms, using input and output data of the previous operation over a fixed time interval, until perfect tracking is achieved 在机器人背景下发展起来的迭代学习控制对解决具有某种重复运动(运行)轨迹跟踪问题具有独特的能力,本文研究的目的是利用迭代学习控制理论为一般控制系统的设计性能优良的控制器,以期扩大迭代学习控制的应用领域。
Electronic soft starter is a kind of novel motor control device which can implement the soft-start, soft-stop and energy-saving of the asynchronous motor . compare in the traditional motor starter, it has outstanding advantages such as stepless regulation of the motor start, avoid the inrush of the torque and the current, and reliable protections, convenient operation and starting repetitively . so the paper aim at electronic soft starter, asynchronous soft starter of electrical machinery electron as research object, study it's high-performance soft starting technology-torque control soft-start, develop its realization circuit 异步电动机电子软起动器是一种集电机软起动、软停机、轻载节能和多种保护功能于一体的新颖电机控制装置,相比于传统的起动器,它突出的优点体现在能够连续无级的调节电机起动、冲击转矩和冲击电流小、控制简便、起动重复性好以及体积小等方面,本文以异步电机电子软起动器为研究对象,研究高性能的电机软起动技术---转矩起动方式,并研制其实现电路。
A digital automatic ultrasonic inspection system designation is introduced . this system was developed with pc computer and embedded dsp, combining computer software and hardware, ultrasonic nondestructive testing, digital signal processing, embedded rtos and visual instruments technology . it meet the requirements of automatic inspection such as high repetitively frequency and real time alertation 该方案以pc机和dsp系统为核心构成主从机系统框架,以基于虚拟仪器思想的pc机应用程序和基于dsp的嵌入式实时操作系统构成双重软件结构,把传统的超声波无损检测技术和先进的虚拟仪器技术、数字信号处理技术、嵌入式实时操作系统、计算机接口通信技术相结合,从而满足了自动化探伤中1k/s的重复频率和实时报警的要求。
Pre-stressed steel structure, a new kind of structure in which combined pre-stress with steel structure, can take full advantage of the elastic strength of steel, and multiple pre-stressed steel structure can repetitively make full use of the elastic strength of steel, thus it can enhance the structural capacity and further improve the rigidity of structure, proving that it is more economic than single pre-stress . therefore, it is both theoretically and practically important to conduct in-depth research on multiple pre-stressed steel structure 预应力钢结构是一种将预应力与钢结构相结合的新型结构,预应力钢结构通过施加预应力以充分利用钢材弹性范围内强度,而多次预应力钢结构可以反复利用钢材弹性范围内极限强度,提高结构承载能力并进一步提高结构刚度,比单次预应力具有更好的经济效益,因此,对预应力钢结构进行深入研究具有重要的理论意义和工程应用价值。
2 . the pre-flashover phenomena of alumina insulators in vacuum have been investigated . according to the experimental results, a reversed pre-flashover current was observed repetitively, which often occurs at the tail of pulse voltage close to zero ( sometimes after the applied pulse voltage ) 首次发现了大量的、重复性的反向预闪络现象,即在冲击电压波尾附近电压幅值已经接近零、甚至在冲击电压作用完后(已没有电压)的情况下仍然存在试样表面发光现象,同时伴有反向的电流脉冲。
Iterative learning control ( ilc ) is a technique for improving the transient response performance of systems or processes that operate repetitively over a fixed time interval . it refines the next control input using the information such as current control input and error signals after each trial until the specified desired trajectory is followed to a high precision 迭代学习控制针对具有重复运行性质的被控对象,利用对象以前运行的信息,通过迭代的方式修正控制信号,实现在有限时间区间上的完全跟踪任务。