Modeling and control of level control process — A comparative study
Tank level control systems are everywhere. All of our process industries mostly depends on this tank level control systems. This paper deals with the modeling and control of a two tank liquid level control system. The considered non linear system is a Single Input Single Output (SISO) system. The goal of the level control is to track the desired level of liquid in to the second tank by controlling the flow rate of the first tank. The tanks are coupled in the interacting and non-interacting ways and a comparison is made between these two systems. The mathematical modeling is done by mass balance method and the PID controller is designed by the trial and error method. The system is simulated with both open loop and closed loop conditions. A comparative study of the time domain response of the two systems while using the PID controller is done by the MATLAB simulation.
Experimentation with an adaptive waterfall controller with disturbance effect
The control systems whose output variable is slow requires more efficient control actions, in this line, there are the cascade-type controllers, which prevent the disturbances in the input of the process from manifesting in the output, currently the analysis are reflected in many investigations, but in a simulated way, and there are a few studies where the implementation is carried out at the didactic level, which allows to perform the verification of the simulations, and to observe the effect that this type of control has when is going to work in a real way, so we can prove the theories and affirmations of the scientific community. In this research, we complete the development of an adaptive cascadetype controller in the two control loops, in a didactic equipment that allows perturbations. To achieve the objectives, we obtained the mathematical modeling of the system, the controllers were designed, the control algorithm is implemented in a plant, whose variables are level and flow, and the effect that these controllers have on perturbations that are made to the process variables. During the implementation of the control algorithm, it was possible to verify that these types of controllers cause that the perturbations that are made at the input of the process were minimun reflected in the output variable. Keywords– Adaptive Control, Cascade, Didactic, Disturbances. Digital Object Identifier (DOI): http://dx.doi.org/10.18687/LACCEI2019.1.1.266 ISBN: 978-0-9993443-6-1 ISSN: 2414-6390
The Analysis on Fire Smoke Exhausting Robot Vibration Based on Wavelet Transform
Belt relaxation, which affects a lot on operation reliability of the fire smoke exhausting robot, is hard to detect. In this paper, a new method for belt relaxation feature recognition based on continuous wavelet transform (CWT) is proposed, and a vibration model which simplified the robot as a 2-dof forced vibration system under harmonic excitation is established. The vibration acceleration signal has been collected using the IEPE sensor and data acquisition card, experimental results verified the accuracy of the vibration model, and weak impact signal caused by the belt relaxation was distinguished, that testify the practicability of the CWT method in belt relaxation feature recognition.