共查询到20条相似文献，搜索用时 125 毫秒
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基于参照依赖和信息反馈理论,探讨了反馈信息框架对大学生节电意愿的影响,并探究了反馈媒介和反馈频率对反馈信息框架影响大学生节电意愿的调节机制.通过实验发现:①反馈信息框架对于大学生节能意愿的主效应显著,且他人参照框架比自我参照框架更能促进大学生节能意愿;②反馈媒介对参照依赖的反馈信息框架影响大学生节能意愿有显著的调节作用,当反馈媒介为手机短信时,他人参照的反馈信息框架更能促进大学生节能意愿;③反馈频率、反馈媒介和信息反馈框架对大学生节能意愿影响有三重交互效应.在信息反馈频率为每周一次时,不论反馈媒介为哪种类型,信息反馈框架的主效应均显著. 相似文献
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运用Meta分析方法(元分析),对1977~2014年期间发表的42篇实验类文献进行综合定量检验,评估信息型策略对居民节能行为的干预效果,并通过亚组分析对信息型策略的干预时机、干预方式、干预频率、干预时长、信息反馈内容五个调节变量进行了调节效应检验。结果显示:信息干预策略对居民节能行为具有积极的促进作用;干预时机、干预方式和信息反馈内容对信息干预策略与居民节能行为之间的关系具有显著调节作用。其中,事后干预优于事前干预,外部反馈和设备监控优于宣传教育;反馈内容上,对比反馈效果最好,其次是环境反馈和评估反馈,标准反馈效果最弱,而信息干预频率和干预时长的调节作用没有得到验证。 相似文献
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介绍一种变压器反馈装置,来调节市电电压,供给城市路灯供电系统,使路灯的工作效率最大,从而达到节能的目的。该方法通过电流反馈方式,减少了铜线的使用,从而降低了成本,简化了绕制工艺。 相似文献
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本文结合内反馈高频斩波调速系统在实际运行过程中出现的一些问题进行了分析,并给出了相应的解决方法和注意事项。内反馈高频斩波调速系统的可靠运行,将会对企业的效益、节能方面带来巨大的作用。 相似文献
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通过高压控制方式改变,引入烟尘量和机组的负荷作为反馈信号,调整高压控制器的触发角和电场的投退,形成一个闭环的控制系统,可以进一步提高系统的节能效率. 相似文献
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当前,随着国家对环保、节能以及资源综合利用要求的不断提高,大型火力发电厂普遍采用干式排渣系统,机组运行中通过调整液压关断门开度以适应机组负荷变化或渣量的排放控制,存在DCS控制时无法对关断门的实际位置做出精确定位和开度控制。针对雷州电厂2*1000MW二次再热机组锅炉干排渣控制系统中炉底液压关断门开关反馈的设计问题,优化增加模拟量反馈,达到预期目的。 相似文献
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本论文利用施耐德TWDPLC和艾默生EV2000变频器控制的智能恒压供水系统对公司原有常规恒压供水系统进行技术革新。重点阐述了以PLC控制技术为基础,通过变频调速原理,压力变送器反馈等实现恒压供水控制系统。简要描述了该系统的工作原理和控制过程,并阐述了相关的节能效果。 相似文献
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《Journal of The Franklin Institute》2022,359(11):5206-5230
In the existing efficient robust model predictive control (ERMPC) algorithms (see e.g. [14,31,32]), through offline optimization and online lookup table calculation, a fixed state feedback control law or a linear interpolated control law is applied to a system when the system state lies between two adjacent polyhedrons, which undoubtedly will result in conservativeness of the controller. Faced with this issue, an improved ERMPC algorithm is proposed in this paper, which considers the nonlinearity between the state feedback control laws with respect to polyhedrons and the norm distance from system state to origin, and can provide continuously variable state feedback control law varying with the state. First, a set of polyhedral parameters and their corresponding state feedback control law sequences are obtained offline by solving a set of LMIs optimization problems. Next, for each state feedback control law sequence, a nonlinear fitting function is established offline between the state feedback control law and its serial number. Then a simplified lookup table is constructed offline to save memory space and shorten online computation time of the controller. According to the simplified lookup table and information of the norm distance from system state to origin, we online establish the coordinate of current state in the nonlinear fitting curve for getting current feedback control law, which changes continuously with the state. The proposed ERMPC algorithm is successfully applied to an actual fast-responding linear one stage inverted pendulum (LOSIP) system to verify its effectiveness. 相似文献
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《Journal of The Franklin Institute》2021,358(14):6941-6961
This paper addresses the cooperative output feedback control of a mobile dual flexible manipulator, which is mounted at a moving platform to grasp and move a rigid object. We derive the distributed parameter model with geometric constraints for the dual flexible manipulator system by utilizing the Lagrange multiplier method and the Hamilton’s principle, which avoids the problem of control spillover. This paper considers a case where the states of system are difficult to measure directly and exploits the high gain observer theory to design the state observers for estimating the unavailable states. Then the cooperative output feedback control scheme is developed by the Lyapunov’s method, which enables the cooperative control of the flexible manipulator system. Furthermore, under the cooperative output feedback control scheme, we prove that the states of the system are uniformly bounded. Finally, the feasibility of the designed cooperative output feedback controllers is verified by numerical simulation. 相似文献
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Wei Xie 《Journal of The Franklin Institute》2010,347(10):1825-1836
A new feedback controller architecture based on disturbance observer (DOB) is proposed to deal with high-frequency measurement noise for high accuracy performance. Compared with the classical DOB-based control system the proposed control structure adds another controller to compensate the feedback of system output. Thus, these influences of both high-frequency measurement noise and low-frequency external disturbance on the system output could be eliminated simultaneously. Meanwhile, the new control system architecture can potentially overcome the conflict between performance and robustness in the traditional feedback framework. A numerical example is included at the end of this paper to illustrate the effectiveness. 相似文献
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In this paper, the optimal synchronization controller design problem for complex dynamical networks with unknown system internal dynamics is studied. A necessary and sufficient condition on the existence of the optimal control minimizing a quadratic performance index is given. The optimal control law consists of a feedback control and a compensated feedforward control, and the feedback control gain can be obtained by solving the well-known Algebraic Riccati Equation (ARE). Especially, in the presence of unknown system dynamics, a novel adaptive iterative algorithm using the information of system states and inputs is proposed to solve the ARE to get the optimal feedback control gain. Finally, a simulation example shows the effectiveness of the theoretical results. 相似文献
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《Journal of The Franklin Institute》2023,360(4):2436-2456
For a class of stochastic strict-feedback nonlinear systems subject to different time delay states, this paper mainly concerns the problem of global asymptotic stabilization. Two new control strategies that the memoryless parameter-dependent state feedback control and the memoryless parameter-dependent output feedback control are taken into consideration, respectively. By skillfully constructing the Lyapunov-Krasovskii (L-K) functional, taking the proper determined parameter and employing the stochastic nonlinear time delay system (SNTDS) stability theory, the global asymptotic stability of the stochastic closed-loop system can be achieved. The proposed output feedback control scheme is finally utilized for the control design of the one-link manipulator system and two-stage chemical reactor system, which can verify the availability of the control approach. 相似文献
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为了提高直流调速系统的动静态性能指标,通常采用闭环控制系统（包括单闭环系统和多闭环系统）。对调速指标要求不高的场合,采用单闭环系统,而对调速指标较高的则采用多闭环系统。按反馈的方式不同可分为转速反馈,电流反馈,电压反馈等。在单闭环系统中,转速单闭环使用较多。 相似文献
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The conventional modal control theory is concerned with the problem of determining a state feedback matrix-valued gain which drives the system eigenvalues to prescribed positions. When the parameters of the open-loop system involve certain variations, the closed-loop eigenvalues, obtained by using a feedback gain determined as above, also contain variations. In the present paper the problem of choosing an additional state feedback gain such as to reduce the closed-loop eigenvalue variations as much as desired is solved. Specifically, upon the assumption that a nominal set of parameter values is given, and that a feedback modal control law which drives the eigenvalues of the nominal closed-loop system to the desired positions is known, two alternative expressions for the required additional reduced eigenvalue sensitivity feedback controller are derived. Both cases of known and unknown system state vector are considered. The theory is illustrated by several examples. 相似文献
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Transient delayed feedback control is proposed by applying the transient control technique to the original delayed feedback control, with the aim of enlarging the stable region of the stabilized periodic oscillation, where the stable region is a subset of the parameter space of feedback gains for which the periodic oscillation is stabilized. The control signal is activated when the system is in a certain subset (the controlling area) of the state space, and inactivated otherwise, which is different from the standard control signal of the original delayed feedback control. The specific control performances of the transient delayed feedback control are investigated through case studies. The relationship between the stable region of the stabilized periodic oscillation and the controlling area is obtained by calculating the maximum Lyapunov exponent, which is a function of the feedback gain. It is shown that the stable region varies non-smoothly with the change of the controlling area. When the controlling area is properly chosen, the stable region with transient delayed feedback control is much larger than the stable region with original delayed feedback control. 相似文献
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Yuanchao Si Chengkang Xie Zhiyuan Zhen Ailiang Zhao 《Journal of The Franklin Institute》2018,355(13):5592-5612
This paper considers local stabilization of a boundary control system coupled by nonlinear parabolic equations. Based on backstepping approach, a linear Volterra-type integral transformation maps the system into another homogeneous target system, and an explicit feedback control law is obtained. Local exponential stabilization of the closed loop is established. A system with three coupled nonlinear parabolic equations is simulated, which show that the obtained feedback control law is feasible. 相似文献
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为了克服单因子混凝投药自控系统因源水水质水量大幅度变化的影响所造成的目标跟踪特下降,提出了以源水流量为前馈变量ＳＣＤ值反馈变量,构成前馈一反馈混凝投药自动控制技术的方案,并付诸于实践,取得了显著的效果。 相似文献