微型风力发电演示仪

设计制作了一种基于风光互补原理的微型风力发电演示仪.该仪器由风力发电机、光伏太阳能电池板、控制器、蓄电池、负载等各部分组成.整个系统以控制器为核心,由风力发电机、光伏太阳能电池板把风能和光能转变为电能并储存于蓄电池中供负载使用.该仪器作为演示实验仪不仅小型、直观、模块化和操作简便,而且演示内容突显物理与工程相结合的知识...     

Dual-beam coaxial amplification system of stimulated Brillouin scattering based on polarization control technology

In the field of Brillouin lidar, it has very important significance to find one method that can amplify the Brillouin scattering signal in real time. One new-type Brillouin lidar detection system based on Nd:YAG pulsed laser and polarization control device is designed in this paper. The key point of this detection system is to have two pulsed coherent lights with same frequency, same polarization and same initial phase, of which one beam is taken as the detection wave for generating stimulated Brillouin scattering signal and the other beam is taken as pumping wave for real time and effective amplification of stimulated Brillouin scattering signal. This detection system mainly includes two pulsed lasers and one electro-optical polarization controller. The laser is mainly used to obtain the pulsed lights with same frequency and same phase, and the polarization controller is mainly used to change the polarization state of two coaxial beams to make them change into same polarization state from orthogonal polarization state thus to enable the pumping wave to amplify the backward stimulated Brillouin scattering signal. It is shown from the experimental results that the adoption of this new system can realize the effect of pumping amplification and can increase the signal to noise ratio to a certain extent.     

单模激光Lorenz系统与Duffing系统缩阶反同步

 对于2阶Duffing系统与3阶单模激光Lorenz系统,用主动控制方法设计了一种同步控制器,实现二者之间的缩阶反同步。依据罗斯 霍维兹判据,给出误差系统在原点处渐进稳定的条件。数值试验证实：在控制器作用下,2阶Duffing系统的状态变量与3阶单模激光Lorenz投影子系统的状态变量振动的幅值相同但方向相反,且在随机噪声干扰下反同步仍能很好地实现。这表明所设计的控制器对于不同阶的Duffing系统与Lorenz系统的缩阶反同步的实现是可行的、有效的,而且具有很好的鲁棒性。     

A new kind of nonlinear fractional-order chaotic phenomenon in coupled systems： coexistence of anti-phase and complete synchronization

In this paper, we have found a kind of interesting nonlinear phenomenon hybrid synchronization in linearly coupled fractional-order chaotic systems. This new synchronization mechanism, i.e., part of state variables are anti- phase synchronized and part completely synchronized, can be achieved using a single linear controller with only one drive variable. Based on the stability theory of the fractional-order system, we investigated the possible existence of this new synchronization mechanism. Moreover, a helpful theorem, serving as a determinant for the gain of the controller, is also presented. Solutions of coupled systems are obtained numerically by an improved Adams Bashforth-Moulton algorithm. To support our theoretical analysis, simulation results are given.     

大功率LED脉冲位置调制解调设计

脉冲位置调制是室内可见光通信的主要调制方式之一,它具有功率利用率高,频带利用率好,抗干扰性强的特点.为实现室内大功率白光LED照明通信,在分析PPM的原理基础上提出了一种改进的调制方式,给出了这种PPM符号的结构,并设计了大功率LED的驱动电路.其主要特点是由单片机直接输出帧同步信号加PPM信号,不设置保护时隙,其利用...     

一类不确定离散混沌系统的自抗扰控制器与小脑神经网络并行优化控制

针对一类受扰不确定离散非线性混沌系统,提出了基于免疫动态微粒群优化策略的ADRC与CMAC神经网络并行控制方法(ADRC-CMAC).ADRC控制器抑制系统扰动,保证系统的稳定性;CMAC神经网络控制器实现前馈控制保证系统的控制精度和响应速度.利用动态免疫微粒群算法对ADRC-CMAC并行控制器参数进行全局优化.实验结果表明该控制方法具有较快系统的响应速度,较好的抗干扰能力,控制精度高. 关键词： 自抗扰控制器 小脑神经网络 并行控制 混沌系统     

Some criteria for the global finite-time synchronization of two Lorenz–Stenflo systems coupled by a new controller

This paper investigates the global finite-time synchronization of two chaotic Lorenz–Stenflo systems coupled by a new controller called the generalized variable substitution controller. First of all, the generalized variable substitution controller is designed to establish the master–slave finite-time synchronization scheme for the Lorenz–Stenflo systems. And then, based on the finite-time stability theory, a sufficient criterion on the finite-time synchronization of this scheme is rigorously verified in the form of matrix and the corresponding estimation for the synchronization time is analytically given. Applying this criterion, some sufficient finite-time synchronization criteria under various generalized variable substitution controllers are further derived in the algebraic form. Finally, some numerical examples are introduced to compare the results proposed in this paper with those proposed in the existing literature, verifying the effectiveness of the criteria obtained.     

基于LQR-IMCS算法的智能结构振动主动控制

为了解决最小控制综合（MCS）算法在快速扰动下缺乏鲁棒性和线性二次调节器（LQR）在非线性扰动下容易失稳的问题,构造了一种自适应增益补偿函数,对标准的MCS算法进行改进.提出了基于LQR-IMCS（改进的最小控制综合）算法的新策略,并通过波波夫准则验证了该系统的稳定性.以实验室压电壁板结构的第1阶振动模态为研究对象,分别施加随机扰动和高次谐波扰动.仿真和实验结果表明：该方法相对于标准的MCS算法具有更快的收敛速度和更小的跟踪误差,对壁板的第1阶模态抑制具有良好的控制效果和鲁棒性.     

一种高精度Fuzzy控制器的设计

提出了一种基于基本Fuzzy控制器基础上更好地模拟人的操作经验来改善控制性能的一种高精度Fuzzy控制器的设计方法 ,针对将语言变量量化出相应的等级引起的误差 ,采用了加权方法进行处理 ,提高了控制器的精度 ,有一定的实用价值     

基于VB的侧滑检测系统串行通信

介绍在Windows下采用VB6．0中的通信控件实现微机与单片机之间的串行通信，结合汽车前轮侧滑量智能检测系统给出了基本通信程序，该技术适用于集散测控系统中对现场采集数据的传输与处理。