A new time-frequency analysis method based on wavelet packet transform in allusion to time-varying harmonic measurement is presented. According to the power complementary of conjugate quadrature filter bank, the time-varying harmonic signal is decomposed with same resolution in frequency-domain by wavelet packet transform. Then the outputs of all subbands are cross-combined and that make different levels of harmonics fall on their corresponding frequency bands. So, the time-varying harmonics could be detected and the time-frequency analysis would be realized.

This paper presents a new time-frequency analysis method based on wavelet transform and wavelet packet transform in allusion to Short-Duration Voltage Variations in power system. A Short-Duration Voltage signal is decomposed with multi-resolution in frequency-domain by wavelet ransform. It makes different Short-Duration Voltage Variations distinguished.

针对电力系统时变谐波信号的分析,提出一种基于小波包分解的时-频分析新方法.该方法利用共轭正交滤波器组,对谐波信号进行小波包变换,使得谐波信号在频域上等间隔分解,所测各次谐波均落入各自相应的频带内,从而达到对奇次时变谐波测量与时频分析的目的.

The parameters of self-adaptive neuron PID controller are optimized based on certain cost function with optimum principal of simplex method by using MATLAB soft.In order to get the characteristic of the self-adaptive neuron PID controller which parameters are optimized,it is used to control the tunnel-like oven.From the result we can deduce that,the parameters of self-adaptive neuron PID controller can be optimized based on certain cost function.

现场总线控制系统中的网络变量通信技术来源PLC网络的全局I/O变量通信.不同现场总线的网络变量通信有所差异,这将导致其适用场合不同.这里剖析了CAN总线,Lonworks总线及WorldFIP总线的网络变量通信机制指出:CAN具有优秀实时性却具有不确定性,Lonworks实时性一般而且具有不确定性,而WorldFIP既具有优良实时性又具有确定性但却是主从方式.这些差异可作为用户设计FCS系统时的参考.

介绍一种基于积分分离PID控制算法的神经元控制器实现方法.编写S函数来构建MATLAB环境下该神经元控制器的SIMU-LINK仿真模型.利用该模型对控制器在电加热炉中的应用进行仿真研究.仿真结果表明,基于积分分离PID控制算法的神经元控制器与传统的神经元PID控制器相比,系统的控制性能得到了较大的改善.

This paper introduces basic principle of dynamic matrix control arithmetic. Due to its contradiction between rapidity and non-overshoot in tracing capacity, the author put out an improvement on performance index to form the arithmetic——dynamic matrix PI control, which can improve control capacity apparently. This paper also deduces the arithmetic, and confirms the superiority of the latter one by comparing the simulation results of the two arithmetic.

本文提出一种基于Smith预估器的神经元控制器的实现方法,该神经元控制器的控制算法是不完全微分先行PID控制.利用MATLAB仿真软件对该控制器在电加热炉中的应用进行仿真研究.仿真结果表明,该控制器具有Smith预估控制和神经元控制的优点.

提出一种在MATLAB环境下基于ITAE性能指标的神经元二自由度PID控制器参数优化方法,并利用经优化设计得到的神经元二自由度PID控制器对隧道式炉进行控制.结果表明,利用MATLAB软件可以实现神经元二自由度PID控制器的参数优化.

给出一种从不完全二自由度PID控制P-I-PD算法派生出的神经元PID控制器的实现方法,利用MATLAB/SIMULINK仿真软件对该控制器在燧道式炉中的应用进行仿真研究.仿真结果表明,神经元P-I-PD控制不但具有二自由度PID控制的优点,而且还具有神经元自适应控制的特点,系统具有较好的跟随性、抗干扰性和较强的鲁棒性.

在电能质量检测领域,测量信号通常叠加着随机噪声,因此在噪声污染比较严重的场合,对检测到的信号一般要进行去噪处理.针对此类噪声问题,利用信号与噪声进行小波变换后在各尺度空间呈现的不同特性,提出了基于小波变换的阈值去噪法.

Realization of a class of incomplete derivative PID control is presented, the control algorithm is realized by neuron, which is based on Smith control principal. Simulation research of this realization method used in tunnel-like oven is done with MATLAB soft. The simulation results show that delay system can be effective controlled, also the character of anti-interference and robustness can be improved.

文中给出从微分先行PID算法派生出的神经元PID控制器,并利用MATLAB/SIMULINK仿真软件对该控制器在电加热炉中的应用进行仿真研究.仿真结果表明,神经元微分先行PID控制不但具有微分先行PID控制的优点而且还具有神经元自适应控制的特点.

A class of predictive PI control algorithm based on expected closed-loop transfer function is presented, simulation research based on MATLAB of predictive PI control on electric oven are also given. The simulation results show that electric oven can be effectively controlled with this control algorithm.

给出从不完全微分型PID算法派生出的神经元PID控制器,并利用MATLAB/SIMULINK仿真软件对该控制器在某隧道式炉中的应用进行仿真研究.仿真结果表明,不完全微分PID控制的神经元实现不但具有不完全微分型PID控制的优点而且还具有神经元控制的自适应特点.

Adjusting parameters of Two Degree-of-Freedom PID controller is a very difficult problem.In this paper, we propose a full neuron realization method of two degree-of-freedom PID controller,and the difficult problem for auto-adjusting parameters is solved by weight value auto-learning.By selecting proper coefficient of neuron weight, the ability of rejecting disturbance and tracking set value can get better at the same time, also the system has self-adaptive ability and higher robustness.

Laying down the single standard multifunctional fieldbus criterion should be based on the function requirement analysis. At first,the communication function requirements of produce fieldse are analysed. Then,the functions provided by each prevailing fieldbus are analysed. Finally,We select the fieldbus as few as possible and make their total function meet the function requirements of produce fields.The selected fieldbus are connected to the open Fiedldbus Control System(FCS) platform and the single standard multifunctional fieldbus is composed. These selected fieldbuses in this fieldbus criterion are equal and possesses expandability. It could be integrated with the management net and connected into Internet.

提出了一种增益自调整的神经元二自由度PID控制方法.利用MATLAB/SIMULINK仿真软件对该控制方法在某生产耐火材料的燧道式炉上的应用进行了系统仿真.结果表明,该控制方法具有较好的自适应性和较强的鲁棒性.

本文简单介绍了超声波流量计的工作原理,并就工业上常用的基于时差法、频差法和多普勒法原理的超声波流量计进行深入讨论,同时针对这些方法测流量时误差的来源分别进行了分析,提出了相应的改进措施,并展望了未来的发展前景.