A potentially feasible method is the use of a chaotic system ' s high sensitivity under condition to detect weak signals , which is quite different from all present methods . fixing parameter of components in a nonlinear circuit , chaotic orbits change with the measured signal . a distance has been defined 利用混沌系统的初值敏感性进行小信号测量是一个很好的有应用潜力的方向,它的测量原理与现有的测量原理完全不同,其基本思想是将待测信号作为混沌系统的初值,在参数不变的条件下,利用混沌系统的初值敏感性,使混沌轨道随待测信号的变化而变化,定义轨道距离,通过测量轨道距离的变化即可测得该小信号。
Nowdays , a majority of vibrating screens rollers on domestic and foreign markets , in fact adopt a kind of mechanic inertia vibration device . the working parameters ( frequency and amplitude ) of screens cannot be adjusted , and they can only be working in fixed parameters , so which have bad adjustabilitis . the inertia vibration device need a great deal of maintaining and high maintaining expense and which have high yawp 当前,国内外市场上的振动筛大多采用机械式惯性激振器作振动源。筛机的工作参数?频率、振幅都不易调节,只能在固定参数下工作,因此适应性较差,且惯性激振器维修量大、维修费用高、噪声大。
5 . according to batch heat exchanger , washing and cip ( cleaning in place ) operation cause its fouling and object gain changing periodically and thus conventional fixed parameter controller is hard to keep good performance , a novel recipe - fnn - based predictive method was developed for the periodical fouling measurement 5 、针对间歇换热设备的周期性结垢现象,以及由此引起的对象特性对变并造成常规控制器动态性能下降等问题,提出了一种基于配方混合模糊神经网络的周期性结垢预测方法。