Summary of Mechanical engineering doctoral thesis: Optimizing the energy flow in controlling mechanical system oscillation

The main objective of the thesis is to provide general methods to control oscillation based on measurement of energy flow, namely: Find the optimal solution for passive control systems based on energy flows; propose the semi-active control algorithms to control the energy flow.
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Summary of Mechanical engineering doctoral thesis: Optimizing the energy flow in controlling mechanical system oscillationMINISTRY OF EDUCATION VIETNAM ACADEMY OF AND TRAINING SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY ----------------------------- Phan Thi Tra My OPTIMIZATION OF ENERGY FLOW IN PORT-CONTROLLED HAMILTONIAN SYSTEM Major: Mechanical engineering Code: 9520101 SUMMARY OF MECHANICAL ENGINEERING DOCTORAL THESIS Ha Noi – 2020The work was completed at: Graduate University of Science andTechnology - Vietnam Academy of Science and Technology.Science instructor 1: Assoc.Prof. Dr. La Duc VietScience instructor 2: Dr. Luu Xuan HungReviewer 1: ...Reviewer 2: ...Reviewer 3:….The thesis will be defended in the Academy-level doctoral thesisevaluation council, meeting at the Graduate University of Scienceand Technology - Vietnam Academy of Science and Technologyat… oclock .. , date… month ... in 2020The thesis can be found at:- Library of Graduate University of Science and Technology- National Library of Vietnam 1 INTRODUCTION1.The urgency of the thesisOscillation control technologies are becoming the base technologyfor the development of constructions, mechanical systems, withapplications from medium-sized systems such as vehicles, robots,rotors, to large systems such as skycrapers, bridges, tunnels ...In terms of energy, vibration control can be divided into three types:passive control, semi-active control and active control. The properlyessence of the oscillation control problem is to optimize the flow ofoscillating energy drawn from the controlled system. This is aresearch direction with many applications. The selection of thesis inthe direction of Optimizing the energy flow in controllingmechanical system oscillation aims to initially approach thismethod.2. The objectives of the thesisThe main objective of the thesis is to provide general methods tocontrol oscillation based on measurement of energy flow, namely:- Find the optimal solution for passive control systems based onenergy flows- Propose the semi-active control algorithms to control the energyflow3. The main research content of the thesisResearch objects:- The vibration isolation of a single degree of freedom system- The quarter car model with two degrees of freedom- Tuned mass damper (TMD) for single degrees of freedom system- TMD for multiple degrees of freedom system 2Scope of the research: passive and semi-active control for specificobjects mentioned above, in case of harmonic excitation.Research methods- Use power flow criteria: solve min-max problems, find optimalparameters in the passive control case or control algorithms in semi-active case.- Time-shifting technique, harmonic balancing method: used to findthe performance index of the designed controller and the lowerbound solution, thereby correcting the control law- Numerical simulation by Matlab software: used to evaluate theeffectiveness of analytical solutions and control algorithms.Layout of the thesis: The thesis consists of 4 chapters, introductionand conclusionChapter 1. Overview of research issues. This chapter presents anoverview of oscillation control methods and basic energy flowformulas.Chapter 2. Controlling the power flow in the isolator.Chapter 3. Controlling the power flow in the quarter car modelChapter 4. Controlling the power flow in the tuned mass damper.General conclusions. Present the main results obtained in the thesis,new points and next major research directions. 3 CHAPTER 1. OVERVIEWThis chapter classifies the control methods based on energy andlimits the scope of the methods used in the thesis. The basic systemsof the PCH system (Port Controlled Hamilton System) wereintroduced to describe the dynamics systems and the energy flowequations in these systems.1.1. Vibration controlThe control methods base on energy include passive, active andsemi-active control. In fact, the control of variation depends on thenature, characteristics and also on the cost (due to the active controlwith high cost) of each specific project. This thesis studies onlypassive and semi-active control.1.2. Energy flow analysisThe variable studied in energy flow analysis is a combination ofeffects due to force, velocity, and their product, power, ie the rate ofenergy change. This combination plays a role as a unique parameterto describe the dynamics and responses of a system, including andreflecting fully the equilibrium and motion of the system. Thereforeovercome limitations in the study of separate displacement respons ...