共查询到20条相似文献,搜索用时 234 毫秒
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变风量空调具有时变、延时、非线性等特点,在此类系统中传统的PID控制算法难以取得最佳的控制效果。基于广义预测自校正的控制算法,控制精度高,具有较强的跟踪性能,但是以增大的计算量和频繁的调节系统参数为代价的。文中提出一种基于改进的Dahlin参数整定方法的自校正PID控制器,该算法在理论建模的基础上,采用在线的带遗忘因子最小二乘法,实现传递函数的参数估计,建立了系统PID参数之间的关系式,实现变风量空调系统的末端控制。算法仿真运算及实验表明,与传统PID及广义预测自校正控制方法相比,文中方法控制精度高于传统PID,同时计算复杂度低于通常广义预测自校正控制。 相似文献
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变风量空调具有时变、延时、非线性等特点,在此类系统中传统的PID控制算法难以取得最佳的控制效果.基于广义预测自校正的控制算法,控制精度高,具有较强的跟踪性能,但是以增大的计算量和频繁的调节系统参数为代价的.文中提出一种基于改进的Dahlin参数整定方法的自校正PID控制器,该算法在理论建模的基础上,采用在线的带遗忘因子最小二乘法,实现传递函数的参数估计,建立了系统PID参数之间的关系式,实现变风量空调系统的末端控制.算法仿真运算及实验表明,与传统PID及广义预测自校正控制方法相比,文中方法控制精度高于传统PID,同时计算复杂度低于通常广义预测自校正控制. 相似文献
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介绍一种由8031单片机系统,ADC0809芯片等组成的自校正控制器的原理及硬件与软件设计,该控制器采用一种实用的自校正算法,应用于甲醛生产过程反应器的温度控制,取得了满意的效果。 相似文献
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广义预测控制的综合性能优于其他形式的自校正控制器,但存在计算量大,计算耗时,实时性差的缺点。本文在前期研究的基础上,对串级广义预测控制相关算法进行优化改进,采用串级控制策略和灰色预测控制技术,设计了船用增压锅炉汽包水位控制器,并基于串级GGPC-PI控制的汽包水位系统进行了仿真,由仿真结果看出,从对船用锅炉汽包水位在全工况和经济工况的仿真结果看出,以灰色预测控制为基础,将其与PI控制有机结合的串级控制显示出灰色广义预测和串级控制的共同优点,该控制策略可以保证系统最后稳定于给定值。 相似文献
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模糊控制在退火炉炉温控制中的应用 总被引:3,自引:0,他引:3
根据退火炉炉温控制的特点,设计并比较了传统PID控制器、模糊PI控制器、史密斯-模糊控制器和参数自校正模糊控制器的性能及控制效果,最后确定了最适于该系统的模糊-PI控制器。 相似文献
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介绍了PHS网呼入成功率和短消息流程,依据短消息模型和性能统计结果分析了群发短信对PHS网呼入成功率的影响,并建议选择合理的时间进行短消息群发以减少对网络负荷的影响。 相似文献
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A. A. Lanne T. V. Merkucheva A. I. Solonina 《Radioelectronics and Communications Systems》2009,52(6):311-316
This study provides a review of digital filters known under the name “interpolated finite impulse response filters” (IFIR filters) that make it possible to create narrowband lowpass filters (LPF) with substantially reduced computational load and, consequently, a simpler design as compared with the conventional finite impulse response filters (FIR filters). 相似文献
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A new method for direct torque control (DTC) based on load angle control is developed. The use of simple equations to obtain the control algorithm makes it easier to understand and implement. Fixed switching frequency and low torque ripple are obtained using space vector modulation, overcoming the most important drawbacks of classic DTC. 相似文献
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Tehuang Liu Wanjiun Liao 《IEEE network》2008,22(1):13-18
Wireless mesh networks have emerged as a promising solution to providing cost-effective last-mile connectivity. Employing multiple channels is shown to be an effective approach to overcoming the problem of capacity degradation in multihop wireless networks. However, existing routing schemes that are designed for single-channel multihop wireless networks may lead to inefficient routing paths in multichannel WMNs. To fully exploit the capacity gain due to multiple channels, one must consider the availability of multiple channels and distribute traffic load among channels as well as among nodes in routing algorithms. In this article we focus on the routing problem in multichannel WMNs. We highlight the challenges in designing routing algorithms for multichannel WMNs and examine existing routing metrics that are designed for multichannel WMNs, along with a simulation-based performance study. We also address some open research issues related to routing in multichannel WMNs. 相似文献
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We present an algorithmic approach to the design of low-power frequency-selective digital filters based on the concepts of adaptive filtering and approximate processing. The proposed approach uses a feedback mechanism in conjunction with well-known implementation structures for finite impulse response (FIR) and infinite impulse response (IIR) digital filters. Our algorithm is designed to reduce the total switched capacitance by dynamically varying the filter order based on signal statistics. A factor of 10 reduction in power consumption over fixed-order filters is demonstrated for the filtering of speech signals 相似文献
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Finite-length delay-optimized multi-input multi-output (MIMO) equalizers that optimally shorten the impulse response memory of frequency-selective MIMO channels are derived. The MIMO equalizers are designed to minimize the average energy of the error sequence between the equalized MIMO channel impulse response and an MIMO target impulse response (TIR) with shorter memory. Two criteria for optimizing the MIMO TIR are analyzed and compared. The presented analytical framework encompasses a multitude of previously-studied finite-length equalization techniques 相似文献
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国产脉冲电镀电源采用手动调节参数,因此在设定好上述参数之后,只能实现单一参数的脉冲波形进行电镀;某些国外电镀电源虽然也实现了程控,但也存在一定的缺陷,如脉宽调节范围较窄,脉冲频率不可调等.我们针对上述缺陷,对传统脉冲电源进行了改造、优化设计.新设计的程序控制脉冲电镀电源以脉冲技术和斩波技术为主要手段,以大功率半导体器件为主开关器件,通过PIC单片机输出各种频率脉冲信号进行控制,来实现各种工艺要求的电镀. 相似文献
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A linear minimum mean-square error (LMMSE) equalizer for avalanche-photodiode (APD) based integrate-and-dump receivers is designed to compensate for intersymbol-interference (ISI) introduced by the APD's random impulse response. Recent work on the characterization of the joint probability distribution of the APD's gain and buildup-time are adopted and utilized to determine the mean and correlation matrix of the APD-based receiver's random impulse response. This LMMSE equalizer is shown to improve the bit-error-rate dramatically at high transmission rates, resulting in an improvement in the receiver sensitivity by approximately 2.3 dB at 15 GHz. 相似文献