Control Design for the Active Stabilization of Rail Wheelsets

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
T. X. Mei ◽  
H. Li
Keyword(s):  
Design Method ◽  
Control Design ◽  
Optimization Procedure ◽  
Control Analysis ◽  
Design And Optimization ◽  
Stabilization Control ◽  
Number Of Factors ◽  
Parameter Variations ◽  
Active Stabilization

Through a detailed control assessment of a conventional railway wheelset, this paper addresses some of the key design issues in the development of active primary suspensions for the stabilization control of railway vehicles. It reveals the basic feedback requirements for achieving adequate stability and hence provides a useful insight of how active controllers may be structured. For the control design, a number of factors in addition to the stabilization are considered including the actuation requirements, creep forces at the wheel-rail contact, track following as well as robustness against parameter variations. Based on the outcome of the control analysis, the study proposes a design and optimization procedure for the development of active wheelset control. The design method is applied to a two-axle vehicle in a case study, which shows that the new design approach is advantageous when compared with other design methods previously studied.

Optimal Design and Control of an Electric DC Motor

1999 ◽  
Author(s):  
Julie A. Reyer ◽  
Panos Y. Papalambros
Keyword(s):  
Control Strategy ◽  
Decision Model ◽  
Control Design ◽  
Dc Motor ◽  
Physical Structure ◽  
Pareto Analysis ◽  
Design And Optimization ◽  
Overall Design ◽  
And Control

Abstract In the design and optimization of artifacts requiring both mechanical and control design, the process is typically divided and performed in separate steps. The physical structure is designed first, a control strategy is selected, and the actual controller is then designed. This paper examines how this separation could affect the overall system design and how the combination of the separate problems into a single decision model could improve the overall design, using an electric DC motor as a case study. The combination is challenging since the two problems often have different design criteria and objectives and mathematical model properties. A Pareto analysis is suggested as a rigorous way to compare a variety of design scenaria.

GA Optimized Formation Control of Autonomous Underwater Vehicles

2018 ◽  
Author(s):  
Mansour Karkoub ◽  
Lotfi Romdhane
Keyword(s):  
Trajectory Tracking ◽  
Formation Control ◽  
Autonomous Underwater Vehicle ◽  
Autonomous Underwater Vehicles ◽  
Optimization Procedure ◽  
Nonlinear Controller ◽  
Parameter Variations ◽  
Formation Keeping ◽  
Robust Nonlinear Controller

In this paper, an optimization procedure is derived to find the best controller for the trajectory-tracking of an autonomous underwater vehicle (AUV) subject to uncertainties (e.g., current disturbances, un-modeled dynamics and parameter variations). The proposed algorithm is based on the dynamic model of the system and a recently proposed controller called Hierarchical Robust Nonlinear Controller (HRNC). The first objective is to find the best values for the controller gains to achieve trajectory tracking of the leader AUV. Starting from a random configuration, the leader AUV and the five followers make and keep a given formation all along the trajectory. A multi-objective optimization, based on genetic algorithms, is used here. A star formation with 6 AUVs is used as a case study to test the proposed algorithm. Simulation results show that the optimized controller gains led to successful formation keeping along the selected path with relatively minimum controller output toques.

Design and Optimization of a Contact-Aided Compliant Mechanism for Passive Bending

2014 ◽  
Vol 6 (3) ◽  
Author(s):  
Yashwanth Tummala ◽  
Aimy Wissa ◽  
Mary Frecker ◽  
James E. Hubbard
Keyword(s):  
Design Optimization ◽  
Compliant Mechanism ◽  
Leading Edge ◽  
Optimization Procedure ◽  
Peak Stress ◽  
Nonlinear Bending ◽  
Design And Optimization ◽  
Compliant Joints ◽  
Compliant Joint

A contact-aided compliant mechanism (CCM) called a compliant spine (CS) is presented in this paper. It is flexible when bending in one direction and stiff when bending in the opposite direction, giving it a nonlinear bending stiffness. The fundamental element of this mechanism is a compliant joint (CJ), which consists of a compliant hinge (CH) and contact surfaces. The design of the compliant joint and the number of compliant joints in a compliant spine determine its stiffness. This paper presents the design and optimization of such a compliant spine. A multi-objective optimization problem with three objectives is formulated in order to perform the design optimization of the compliant spine. The goal of the optimization is to minimize the peak stress and mass while maximizing the deflection, subject to geometric and other constraints. Flapping wing unmanned air vehicles, also known as ornithopters, are used as a case study in this paper to test the accuracy of the design optimization procedure and to prove the efficacy of the compliant spine design. The optimal compliant spine designs obtained from the optimization procedure are fabricated, integrated into the ornithopter's wing leading edge spar, and flight tested. Results from the flight tests prove the ability of the compliant spine to produce an asymmetry in the ornithopter's wing kinematics during the up and down strokes.

Combined Optimal Design and Control With Application to an Electric DC Motor

2002 ◽  
Vol 124 (2) ◽  
pp. 183-191 ◽  
Author(s):  
Julie A. Reyer ◽  
Panos Y. Papalambros
Keyword(s):  
Decision Model ◽  
Control Design ◽  
Dc Motor ◽  
Physical Structure ◽  
Pareto Analysis ◽  
Design And Optimization ◽  
Overall Design ◽  
And Control ◽  
Fully Coupled

In the design and optimization of artifacts requiring both mechanical and control design, the process is typically divided and performed in separate steps. The physical structure is designed first, a control strategy is selected, and the actual controller is then designed. This article examines how this separation could affect the overall system design and how the combination of the separate problems into a single decision model could improve the overall design, using an electric DC motor as a case study. The combination is challenging since the two problems often have different design criteria, decision objectives, and mathematical model properties. Furthermore, the two problems are often fully coupled in that the physical structure depends on the controller and the controller depends on the physical structure. A Pareto analysis is suggested as a rigorous way to compare a variety of design scenaria.

Robust Input Shaper Control Design for Parameter Variations in Flexible Structures

1999 ◽  
Vol 122 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Lucy Y. Pao ◽  
Mark A. Lau
Keyword(s):  
Design Method ◽  
Structural Parameters ◽  
Flexible Structures ◽  
Control Design ◽  
Input Shaping ◽  
Input Shaper ◽  
Modeling Errors ◽  
Parameter Variations ◽  
Damped Systems ◽  
Parameter Values

Input shaping has been shown to yield good performance in the control of flexible structures while being insensitive to modeling errors. However, previous studies do not take into account the distributions of the parameter variations. We develop a new input shaping method that allows the ranges of system parameter values to be weighted according to the expected modeling errors. Comparisons with previously proposed input shaper designs are presented to illustrate the qualities of the new input shaper design method. These new shapers will be shown to have better robustness under uncertainty in structural parameters and shorter shaper lengths for lightly damped systems. [S0022-0434(00)02201-2]

PERANCANGAN SISTEM PEMBELAJARAN MOBILE (M-LEARNING) BERBASIS ANDROID PADA MATERI BANGUN DATAR DAN BANGUN RUANG

2018 ◽  
Vol 1 (2) ◽  
pp. 1-17
Author(s):  
Tedi Budiman
Keyword(s):  
Mobile Learning ◽  
Design Method ◽  
Case Study Method ◽  
Application Development ◽  
Software Application ◽  
Rapid Application Development ◽  
User Design ◽  
Design Software ◽  
Application Programs

One example of the growing information technology today is mobile learning, mobile learning which refers to mobile technology as a learning medium. Mobile learning is learning that is unique for each student to access learning materials anywhere, anytime. Mobile learning is suitable as a model of learning for the students to make it easier to get an understanding of a given subject, such as math is pretty complicated and always using formulas.The design method that I use is the case study method, namely, learning, searching and collecting data related to the study. While the development of engineering design software application programs that will be used by the author is the method of Rapid Application Development (RAD), which consists of 4 stages: Requirements Planning Phase, User Design Phase, Construction Phase and Phase Cotuver.

Banking on Failure

2020 ◽  
Author(s):  
Richard S Collier
Keyword(s):  
Financial Markets ◽  
Financial Institutions ◽  
Current Position ◽  
Tax System ◽  
Number Of Factors ◽  
Tax Systems

This book seeks to explain why and how banks ‘game the system’. More specifically, its objective is to account for why banks are so often involved in cases of misconduct and why those cases often involve the exploitation of tax systems. To do this, a case study is presented in Part I of the book. This case study concerns a highly complex transaction (often referred to as ‘cum-ex’) designed to exploit a flaw at the intersection of the tax system and the financial markets settlements system. It was entered into by a very large number of banks and other financial institutions. A number of factors make the cum-ex transaction remarkable, including the sheer scale of the financial amounts involved, the large number of banks and financial institutions involved, the comprehensive failure of the controls infrastructure in this highly regulated sector, and the fact that authorities across Europe have found it so difficult to deal with the transaction. Part II of the book draws out the wider significance of cum-ex and what it tells us about modern banks and their interactions with tax systems. The account demonstrates why the exploitation of tax systems by banks is practically inevitable due to a variety of systemic features of the financial markets and of tax systems themselves. A number of possible responses to the current position are suggested in the final chapter.

scholarly journals Photovoltaic Cleaning Optimization: A Simplified Theoretical Approach for Air to Water Generator (AWG) System Employment

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4271
Author(s):  
Lucia Cattani ◽  
Paolo Cattani ◽  
Anna Magrini
Keyword(s):  
Energy Loss ◽  
Energy Production ◽  
New Technologies ◽  
Optimization Procedure ◽  
System Size ◽  
Design Tool ◽  
Semiempirical Model ◽  
Photovoltaic Panel ◽  
Water Amount

Photovoltaic panel efficiency can be heavily affected by soiling, due to dust and other airborne particles, which can determine up to 50% of energy production loss. Generally, it is possible to reduce that impact by means of periodic cleaning, and one of the most efficient cleaning solutions is the use of demineralized water. As pauperization of traditional water sources is increasing, new technologies have been developed to obtain the needed water amount. Water extracted from the air using air to water generator (AWG) technology appears to be particularly suitable for panel cleaning, but its effective employment presents issues related to model selection, determining system size, and energy efficiency. To overcome such issues, the authors proposed a method to choose an AWG system for panel cleaning and to determine its size accordingly, based on a cleaning time optimization procedure and tailored to AWG peculiarities, with an aim to maximize energy production. In order to determine the energy loss due to soiling, a simplified semiempirical model (i.e., the DIrt method) was developed as well. The methodology, which also allows for energy saving due to an optimal cleaning frequency, was applied to a case study. The results show that the choice of the most suitable AWG model could prevent 83% of energy loss related to soling. These methods are the first example of a design tool for panel cleaning planning involving AWG technology.

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