Autoresonant Homeostat Concept for Engineering Application of Nonlinear Vibration Modes

2004 ◽  
Author(s):  
V. I. Babitsky ◽  
I. J. Sokolov
Keyword(s):  
Engineering Application ◽  
Phase Shifting ◽  
Control Technique ◽  
Mechatronic Systems ◽  
Nonlinear Modes ◽  
Strongly Nonlinear ◽  
Nonlinear Mode ◽  
Modes Of Vibration ◽  
The Media ◽  
And Control

Analysis of strongly nonlinear systems revealed an existence of nonlinear modes of vibration with spatial and temporal concentration of energy. The modes can be realised, for example, through intensification of the vibration process by condensing the vibration into a sequence of collisions for impulsive action of the tools to the media being treated or can be as a result of some discontinuity (slackening of a contact, arrival of crack etc.) in the structure. The use of the nonlinear modes to develop useful mechanical work leads to necessity of excitation and control of resonance in ill-defined dynamical systems. This is due to the poorly predictable response of the media being treated. Excitation, stabilisation and control of a nonlinear mode at the top intensity in such systems is an engineering challenge and needs a new method of adaptive control for its realisation. Such a control technique was developed with the use of self-exciting mechatronic systems. The excitation of the nonlinear mode in such systems is a result of artificial instability of mechanical system conducted by positive electronic feedback. The instability is controlled by intelligent identification of the mode and active tracing of the optimal relationship between phase shifting and limitation in the feedback circuitry. This method of control is known as autoresonance. Applications of autoresonant control for development of the new machines are described.

A SysML-Based Modeling Language for Mechatronic System Architecture

2015 ◽  
Author(s):  
Ruirui Chen ◽  
Yusheng Liu ◽  
Yue Cao ◽  
Jing Xu
Keyword(s):  
Systems Engineering ◽  
System Architecture ◽  
Modeling Language ◽  
Mechatronic Systems ◽  
Geometric Information ◽  
Automatic Reasoning ◽  
Control Behavior ◽  
Reasoning System ◽  
And Control ◽  
Model Based Systems Engineering

Model Based Systems Engineering (MBSE) is the mainstream methodology for the design of complex mechatronic systems. It emphasizes the application of the system architecture, which highly depends on a formalized modeling language. However, such modeling language is less researched in previous studies. This paper proposes a general modeling language for representing the system architecture, aiming for representing function, physical effect, geometric information and control behavior which the system should satisfy. It facilitates the communication of designers from different technological domains and supports a series of applications such as automatic reasoning, system simulation, etc. The language is illustrated and verified with a practical mechatronic device finally.

Supporting Co-Design of Physical and Control Architectures of Mechatronic Systems

2011 ◽  
Author(s):  
Andre´s A. Alvarez Cabrera ◽  
Hitoshi Komoto ◽  
Tetsuo Tomiyama
Keyword(s):  
Control Structure ◽  
Mutual Influence ◽  
Early Stage ◽  
Physical Structure ◽  
Mechatronic Systems ◽  
Design Problems ◽  
Software And Hardware ◽  
Design Integration ◽  
And Control ◽  
Recent Tendency

There is a rather recent tendency to define the physical structure and the control structure of a system concurrently when designing the architecture of a product, i.e., to perform codesign. We argue that co-design can only be enabled when the mutual influence between physical system and control is made evident to the designer at an early stage. Though the idea of design integration is not new, to the best of our knowledge, there is no computer tooling that explicitly supports this activity by enabling co-design as stated before. In this paper the authors propose a method for co-design of physical and control architectures as a better approach to design mechatronic systems, allowing to exploit the synergy between software and hardware and detecting certain design problems at an early stage of design. The proposed approach is supported by a set of tools and demonstrated through an example case.

scholarly journals Power Sharing and Control Strategy for Provisionally Coupled Microgrid Clusters through an Isolated Power Exchange Network

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7514
Author(s):  
S.M. Ferdous ◽  
Farhad Shahnia ◽  
GM Shafiullah
Keyword(s):  
Power Sharing ◽  
Frequency Deviation ◽  
Load Shedding ◽  
Control Mode ◽  
Control Technique ◽  
Communication Link ◽  
Control Mechanisms ◽  
Power Exchange ◽  
Exchange Network ◽  
And Control

The two common mechanisms of load-shedding and renewable curtailment can prevent provisional overloading and excessive generation and the subsequent unacceptable voltage and frequency deviation in standalone microgrids (MGs), which makes MGs less resilient and reliable. However, instead of enabling load-shedding or renewable curtailment, such overloading or over-generation problems can be alleviated more efficiently and cost-effectively by provisionally interconnecting the neighboring MGs to exchange power amongst themselves. In such a scheme, the interconnected MGs can supply their local demand, as well as a portion of the demand of the adjacent MGs. In order to implement this strategy, a three-phase ac link can be used as the power exchange network, while each MG is coupled to the link through a back-to-back power electronics converter, in order to maintain the autonomy of each MG if they are eachoperated under different standards. This paper proposes a suitable decentralized power management strategy without a communication link between the MGs to achieve power-sharing amongst them and alleviate unacceptable voltage and frequency deviation along with the required control technique for the power electronic converters, which can be implemented at the primary level based on the measurement of the local parameters only. To this end, one of the converters should always regulate the dc link voltage while the other converter should operate in droop control mode when the MG is healthy and in constant PQ mode when overloaded or over-generating. Suitable status detection and mode transition algorithms and controllers were also developed and are proposed in this paper. The performance of the proposed power exchange and control mechanisms were evaluated and verified via PSIM®-based numerical simulation studies. The stability and sensitivity of the proposed power exchange topology are also analyzed against several critical design and operational parameters.

scholarly journals World local government control and reference value for Vietnam

2021 ◽  
Vol 63 (4) ◽  
pp. 29-33
Author(s):  
Dang Phuc Vu ◽  
◽  
Thi Thanh Nga Nguyen ◽  
Keyword(s):  
Local Government ◽  
Local Governments ◽  
Central Government ◽  
Reference Value ◽  
Social Institutions ◽  
Local Power ◽  
Government Control ◽  
The People ◽  
The Media ◽  
And Control

Control of local governments in countries around the world is very diverse,but mainly divided into two categories: 1) control of state agencies (central government control, court control, control of local power representations); 2) control of social institutions including political party control over local government, control of organizations and public associations, control of the media, and control of the people. The paper focuses on analysing the controlling local governments in some countries, thereby giving reference values for Vietnam.

Design of Hydraulic Station of Crawler Hydraulic Drilling Rig

2014 ◽  
Vol 889-890 ◽  
pp. 380-384
Author(s):  
Zhi Liu ◽  
Peng Fang ◽  
Di Wu ◽  
Dong Li
Keyword(s):  
Design Process ◽  
Structural Design ◽  
Control Technique ◽  
Pumping Station ◽  
Drilling Rig ◽  
Pumping Stations ◽  
Hydraulic Station ◽  
Scheme Selection ◽  
And Control

This article describes the design process of pumping stations of crawler full hydraulic drilling rig. The principle of full hydraulic drilling rig pumping station,scheme selection, hydraulic components selection and structural design of the tank were presented. The system used double loops in which some advanced hydraulic components and control technique were adopt.

A Rapid Recursive Experimental Approach to Structure/Control Re-Design

1995 ◽  
Author(s):  
Anton Pil ◽  
Haruhiko Asada
Keyword(s):  
System Performance ◽  
Recursive Algorithm ◽  
Descent Method ◽  
Gradient Descent Method ◽  
Control Parameters ◽  
Multiple Control ◽  
Mechatronic Systems ◽  
Loop Control ◽  
Structural Reinforcement ◽  
And Control

Abstract This paper introduces an experimental recursive method for simultaneously changing both the mechanical structure and control design of mechatronic systems in order to improve the system’s overall performance. The method improves a system’s closed-loop control specifications through recursive concurrent structure reinforcement and control gain optimization. By using a process of structural reinforcement, a single prototype structure can be used repeatedly until the system performance goals are achieved. To determine the optimal incremental structure changes, a recursive algorithm based on a gradient descent method and a parameter estimation theory is employed. After the incremental structure reinforcements are applied, the control parameters are optimized with respect to multiple control specifications. Next, the resulting system incorporating the structure and control changes is tested and compared with the desired level of performance. The entire process consisting of experimental evaluation, data analysis, and structure reinforcement is repeated until the system performance achieves the desired level. Simulation experiments are successful in changing both the structural and control parameters of a simplified positioning system and show improvement in the system’s overall settling time.

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