scholarly journals Lower bound of performance index of anti-sway control of a pendulum using on-off damping radial spring-damper

2019 ◽  
Author(s):  
La Duc Viet ◽  
Nguyen Trong Kien
Keyword(s):  
Lower Bound ◽  
Performance Index ◽  
Frequency Curve ◽  
Fixed Times ◽  
Sway Motion ◽  
Damping Controller

An on-off damping radial spring-damper can be attached to a pendulum to suppress its nonlinear sway motion. This paper studies the class of on-off damping controller, which switches the damping level from high to low and back at fixed times every quarter of period. Among this class, this paper shows the solution of the lower bound controller producing the lowest amplitude-frequency curve. The lower bound curve shows some fundamental natures of the system and gives some useful directions for a good on-off damping controller. 

Research on Maneuvering Trajectories Optimization in Bearings-Only Localization for Single Observer

2012 ◽  
Vol 433-440 ◽  
pp. 5946-5950 ◽  
Author(s):  
Zhang Song Shi ◽  
Rui Li ◽  
Hang Yu Wang
Keyword(s):  
Genetic Algorithm ◽  
Lower Bound ◽  
Performance Index ◽  
Constant Velocity ◽  
Dilution Of Precision ◽  
Localization Precision ◽  
Course Sequence ◽  
Geometric Dilution Of Precision

Based on Crammer-Rao Lower Bound (CRLB), this paper adopts Geometric Dilution of Precision (GDOP) as the optimizing performance index to analyze the localization precision in Bearing-only localization for single observer. And the genetic algorithm is employed to calculate the optimal course sequence. The movement straight with constant velocity and movement with constant prefix angles are analyzed. Simulations show that maneuvering trajectory is propitious to improve localization precision.

ESTIMATED AND ACCURATE SYSTEM RELIABILITIES OF A MAINTAINABLE COMPUTER NETWORK SUBJECT TO MAINTENANCE BUDGET

2012 ◽  
Vol 29 (03) ◽  
pp. 1240021 ◽  
Author(s):  
YI-KUEI LIN ◽  
PING-CHEN CHANG
Keyword(s):  
Lower Bound ◽  
Branch And Bound ◽  
Upper Bound ◽  
System Reliability ◽  
Performance Index ◽  
Computer Network ◽  
Estimation Procedure ◽  
Reliability Performance ◽  
A Performance

This paper proposes a performance index to evaluate the capability of a maintainable computer network (MCN) that is required to send d units of data from the source to the sink through two paths within time T. The proposed system reliability performance index quantifies the probability that a MCN delivers a sufficient capacity with a maintenance budget no greater than B. Two procedures are integrated in the algorithm — an estimation procedure for estimated system reliability and an adjusting procedure utilizing the branch-and-bound approach for accurate system reliability. Subsequently, the estimated system reliability with lower bound and upper bound, and accurate system reliability can be derived by applying the recursive sum of disjoint products (RSDP) algorithm.

Lower bound of performance index of an on–off damper in a state-space system

2018 ◽  
Vol 233 (12) ◽  
pp. 4288-4298
Author(s):  
La Duc Viet ◽  
Phan Thi Tra My
Keyword(s):  
Lower Bound ◽  
State Space ◽  
Performance Index ◽  
Vibration Isolation ◽  
Space System ◽  
Mass System ◽  
Isolation System ◽  
System A ◽  
Variable Function ◽  
State Space System

This paper presents a theoretical lower bound of the performance index of an on–off damper placed in a state-space system under harmonic disturbance. The bound is obtained by minimizing a single-variable function. The lower bound is a good theoretical benchmark to measure a practical on–off damping controller. The usefulness of the bound is demonstrated through four examples: a vibration isolation system, a quarter-car suspension system, a mass damper system, and a four-mass system. The examples show how the lower bound can be used to improve some conventional controllers.

scholarly journals Amplification of useful vibration using on-off damping

2020 ◽  
Author(s):  
La Duc Viet
Keyword(s):  
Single Variable ◽  
Variable Function ◽  
Electrical Damping ◽  
Fixed Times ◽  
Excited Oscillator ◽  
Damping Controller

This paper points out how much useful vibration can be extracted from a base-excited oscillator, which is controlled by the on-off electrical damping. We study the class of on-off electrical damping controller, which switches the damping level from high to low and back at fixed times every quarter of period. The problem reduces to the maximization of a single-variable function. This result can open the new direction to amplify the useful vibration using controllable dampings.

VC++ and MATLAB-Based Interactive Filter Design

2011 ◽  
Vol 66-68 ◽  
pp. 1972-1975
Author(s):  
Man Qing Mao ◽  
Liang Gao ◽  
Wei Zheng ◽  
Zi Wei Mao
Keyword(s):  
Transfer Function ◽  
Performance Index ◽  
Filter Design ◽  
Frequency Curve ◽  
Hybrid Programming ◽  
Matlab Program ◽  
Mixed Programming ◽  
Denominator Polynomial

Filter designing is a work that most electronics engineers often do. In order to avoid editing cumbersome and duplicate MATLAB program every time when design a filter, now we design a filter designing software based on hybrid programming of VC++ and MATLAB. Users only need to enter the performance index; you can get to meet the requirements of the filter amplitude-frequency curve, phase-frequency curve, and the coefficients of the numerator and denominator polynomial of transfer function to achieve the filter design. Engine is implemented by VC++ and MATLAB mixed programming, making the interface friendly and program simple.

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