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排序方式: 共有83条查询结果,搜索用时 140 毫秒
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Reset controllers are linear controllers that reset some of their states to zero when their input is zero. We are interested in their feedback connection with linear plants, and in this paper we establish fundamental closed-loop properties including stability and asymptotic tracking. This paper considers more general reset structures than previously considered, allowing for higher-order controllers and partial-state resetting. It gives a testable necessary and sufficient condition for quadratic stability and links it to both uniform bounded-input bounded-state stability and steady-state performance. Unlike previous related research, which includes the study of impulsive differential equations, our stability results require no assumptions on the evolution of reset times. 相似文献
3.
介绍了用CPLD辅助设计方法在嵌入式系统中进行MPU复杂逻辑功能设计的总体方案。给出了通过对XC5144中复用控制寄存器进行配置以实现MPU复位逻辑和CPM协议切换的实现方案和设计要点。 相似文献
4.
介绍了一种新型的恒压复位双管正激DC-DC变换器。通过外加恒压复位电路,双管正激DC-DC变换器能扩展工作占空比。恒压复位电路由一个开关与二极管并联后与一个复位电容串联组成,并联在直流母线上。在正常工作时,恒压复位电路的开关一直导通, 复位电容直接并联在直流母线上。 当输入掉电时,恒压复位电路的开关关断,复位电容从直流母线断开。这样, 该变换器就有比较恒定的复位电压,可以增大变压器匝数比设计。 与通常的双管正激变换器相比,该变换器的元件应力较低,效率更高。最后,给出了 80V 输入 12V/18A输出的 实验结果。 相似文献
5.
This paper is concerned with the monitoring of a biodiesel production process, more specifically with the monitoring of the esterification of grease trap wastes, a low quality feedstock for biodiesel production typically characterized by its high content of Free Fatty Acids (FFAs). The esterification takes place in a jacketed Continuous Stirred Tank Reactor (CSTR). A reset observer is designed and applied in order to provide on-line estimation of the concentration of FFAs from temperature measurements within the CSTR. In addition, the proposed reset observer is compared to two other observers (classical fuzzy observer and extended Kalman filter). According to a multiple range test conducted for analyzing the estimation error, the monitoring task for the process under study has been better fulfilled by the reset observer which is able to update the estimation results every instant when the measurements were available. 相似文献
6.
According to Bode's gain-phase relationship, in linear time-invariant controllers, introducing an integral action to eliminate the steady-state error has an adverse effect of increased phase delay and overshoot, leading to performance deterioration. Moreover, increasing the bandwidth of the closed-loop system to enhance the low-frequency disturbance rejection invariably amplifies the sensitivity to high-frequency disturbances. Hence, the performance of the linear controllers is always limited due to these fundamental frequency- and time-domain limitations. Motivated by the desire to address the fundamental limitations of linear controllers and improve the time-varying closed-loop performance, we put forward a novel setpoint-triggered reset integrator strategy that varies the integrator cut-off frequency based on the setpoint information. Particularly, to tackle the time-varying disturbances and setpoint profiles, the proposed controller consists of a nominal linear controller and a variable-gain reset integrator. We show the global asymptotic stability of the proposed methodology using positive-real lemma along with the LaSalle's invariance principle and experimentally validate using measured frequency response function. Moreover, the efficacy of the proposed technique compared to that of the linear controller is experimentally demonstrated on a benchmark rotary servo system. Experimental results assessed using the tracking error and cumulative power spectral density substantiate that the proposed control strategy can not only improve the low-frequency disturbance rejection but also augment the high-frequency trajectory tracking performance. 相似文献
7.
苑彩云 《河北工业大学学报》1990,(3)
本文建立了多路换向阀阀芯的运动方程及幅频特性方程,由这些方程得到为了减少扰动频率的影响,应提高系统的固有频率.而固有频率与弹簧重量成反比,因此令其重量最小可作为多路换向阀复位弹簧优化设计的目标函数,在此基础上建立其优化模型,并应用单调分析法对一种多路换向阀进行了优化设计. 相似文献
8.
9.
S.B. Lee 《Thin solid films》2007,515(12):5118-5122
The characteristics of wall charge after squared and ramped reset pulse have been experimentally investigated in an AC-PDP with a versatile driving simulator (VDS) system, in which arbitrary driving waveforms and sequences can be edited. Rising or falling times of ramped reset pulse have been varied to be 0, 30, 70, 110 and 150 V under fixed zero falling or rising times, respectively, and the reset voltage is fixed to be 320 V. The longer rising (either falling) times under zero falling (either rising) time in reset pulse make the less IR intensity caused by weak self-discharge that occurred at falling (either rising) time in reset pulse. Generally, the ramped reset pulses have been observed to have large wall voltages of 100 to 200 V while the squared reset pulses are to be 4 V by the weak self-discharges at falling time of reset pulse in this experiment. 相似文献
10.
主要讨论了标准对钢丝绳夹绳器的设计要求和规定,并对现有市场上的钢丝绳夹绳器的类型.工作原理进行了综合的分析和研究;简述了钢丝绳夹绳器的型式试验方法.探讨了曳引比为1:1时的钢丝绳夹绳器制动力的计算方法。另外.对其他类型的轿厢上行超速保护装置进行了详细的分析。 相似文献