Topic
Proportional control
About: Proportional control is a research topic. Over the lifetime, 3756 publications have been published within this topic receiving 49050 citations.
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TL;DR: A methodology is proposed in this study to assess the vulnerability of EISN based on the automatic control theory and shows that the regulator plays a key role to enhance the resilience of the network system to vulnerability.
Abstract: System fluctuations of eco-industrial symbiosis network (EISN) organization due to disturbance are very similar to the controller adjustment in the automatic control theory Thus, a methodology is proposed in this study to assess the vulnerability of EISN based on the automatic control theory The results show that the regulator plays a key role to enhance the resilience of the network system to vulnerability Therefore, it is imperative to strengthen the real-time regulation and control of EISN so that the system stability is improved In order to further explore the impact of various regulations on the system vulnerability, the influence of system stability is simulated by means of proportional, differential, and integral control A case study with Guigang eco-industrial park (EIP) was undertaken to test this model The results showed that when the system was disturbed at different positions, the key nodes which had great influence on system vulnerability could be selected according to the magnitude of simulation curve By changing the ratio coefficient of proportional, differential, and integral units to adjust the ecological chain network, the system's resilience to vulnerability can be enhanced Firstly, if basic conditions of EISN organization remain unchanged, the integral control of the policy support and infrastructure sharing should be strengthened Secondly, the differential regulation should be improved continuously for the technological innovation capability of key node enterprises Finally, the key chain filling projects should be introduced for proportional control so that the chain network design can be optimized from the source
13 citations
Patent•
03 Nov 2004
TL;DR: In this article, an electrical voice coil is used to move the gating element to compensate for any perturbing mechanical vibrations, and the result is a valve which closes securely, is infinitely variable within a range, and can make up to a full stroke, from fully closed to fully open, within 3 to 10 milliseconds, compared to the 15 milliseconds needed by a solenoid.
Abstract: In order to provide proportional control of a poppet valve or a gate valve, adapted for fluid power applications, an electrical voice coil is used to move the gating element. Further, a preferred embodiment includes a feedback means for detecting and regulating the position of the gating element, for example to compensate for any perturbing mechanical vibrations. The result is a valve which closes securely, is infinitely variable within a range, and can make up to a full stroke, from fully closed to fully open, within 3 to 10 milliseconds, compared to the 15 milliseconds needed by a solenoid. Due to its fast response time, the improved valve mechanism provides much faster tracking of any changes in an applied command signal. Suitable applications are mechanical testing devices, and other repetitive motions situations, such as industrial automation and animatronics.
13 citations
TL;DR: In this paper, a single mass flexible rotor on rigid supports with proportional and derivative feedback control was considered and the rotor-control system was considered as well as unbalance response and the results indicated that proportional control alone increases the rotor critical speed, but does not affect the system damping.
Abstract: This paper considers a single mass flexible rotor on rigid supports with proportional and derivative feedback control Undamped and damped free vibrations of the rotor-control system are considered as well as unbalance response Results indicate that proportional control alone increases the rotor critical speed, but does not affect the system damping Proportional control alone also decreases the system logarithmic decrement which tends to make the system more susceptible to external vibration excitations Derivative feedback control acts to increase the system damping, to reduce the response sensitivity, and is highly desirable
13 citations
09 Jul 2006
TL;DR: In this paper, a new model based on Gravdahl-Egeland's model was proposed, to which a CCV was added to control simultaneousely the speed and surge/stall, and to accelerate the compressor without stalling it.
Abstract: To control the speed of a gas turbine compressor, Gravdahl and Egeland used a proportional control law. However, this control was not capable of preventing the axial compression system from entering in rotating stall and surge. In this paper, we propose a new model based on Gravdahl-Egeland's model, to which we add a CCV. The purpose is to have more flexibility in the design of strategies, to control simultaneousely the speed and surge/stall, and to accelerate the compressor without stalling it.
13 citations
Patent•
25 Oct 1978
TL;DR: In this paper, an overshoot judging circuit is added to a proportional control system to restrict the overshoot caused by a rapid decrease of water supply. But this circuit is not suitable for the case of a small amount of water.
Abstract: PURPOSE: To restrict an overshoot to be caused at a rapid decrease of water supply amount by the additional provision of an overshoot judging circuit in a proportional control system included in the combustion control device of the proportional control system which carries out the control based on the temperature of water. CONSTITUTION: In the combustion control device of the proportional control system including a water temperature detector which provide a signal representing the detected value, a PID control circuit which includes a common integrating circuit comprising an OA amplifier 41 and the like and receives the signal from the detector, and a fuel supply means which determines the amount of fuel supply based on the output from the PID control circuit and supplies the fuel accordingly, a circuit for detecting an overshoot occurrence of the water temperature is provided which fanctions in accordance with the water temperature detection signal. In such a construction, if the water supply rate W o rapidly decreases to W 2 , a thermister 6 detects this decrease after a short period, And when the detected value exceeds an overshoot judging temperature, the overshoot judging circuit reverses to compulsively make an unreversible input of the OA amplifier 41 to be of a low level. Accordingly, the current flowing through a proportional valve 3 is decreased to such a value as to allow the amount of gas at the necessary minimum. COPYRIGHT: (C)1982,JPO&Japio
13 citations