Active Control of Impact Vibration Using Feedforward Control Method

1989 ◽  
Vol 111 (1) ◽  
pp. 53-60 ◽  
Author(s):  
N. Tanaka ◽  
Y. Kikushima
Keyword(s):  
Control Method ◽  
Feedforward Control ◽  
Active Vibration Control ◽  
Analog Computer ◽  
Control Technique ◽  
Signal Wave ◽  
Control Effect ◽  
State Equations ◽  
The Impact ◽  
Impact Vibration

For the purpose of developing a vibrationless forge hammer, this paper presents a principle of the vibrationless forge method based upon an active vibration control technique. Then, from a viewpoint of feedforward control method, the vibrationless forge system is analyzed, and state equations of the system are derived. Next, with a view to simulating the vibrationless forge system using an analog computer, a signal wave of an impact force actually taken in a hammering test is employed as an input to the analog computer. Moreover, the control effect for suppressing the impact vibration is discussed. Finally, in order to obtain a perspective to realize the vibrationless forge hammer, an experiment is carried out, and the effectiveness of the vibrationless forge method is verified.

scholarly journals Flatness-Based Control of a Two Degrees-of-Freedom Platform With Pneumatic Artificial Muscles

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
David Bou Saba ◽  
Paolo Massioni ◽  
Eric Bideaux ◽  
Xavier Brun
Keyword(s):  
Degrees Of Freedom ◽  
Control Method ◽  
Sliding Mode ◽  
Feedforward Control ◽  
Volume Ratio ◽  
Open Loop ◽  
Control Technique ◽  
Artificial Muscles ◽  
Two Degrees Of Freedom ◽  
Pneumatic Artificial Muscles

Pneumatic artificial muscles (PAMs) are an interesting type of actuators as they provide high power-to-weight and power-to-volume ratio. However, their efficient use requires very accurate control methods taking into account their complex and nonlinear dynamics. This paper considers a two degrees-of-freedom platform whose attitude is determined by three pneumatic muscles controlled by servovalves. An overactuation is present as three muscles are controlled for only two degrees-of-freedom. The contribution of this work is twofold. First, whereas most of the literature approaches the control of systems of similar nature with sliding mode control, we show that the platform can be controlled with the flatness-based approach. This method is a nonlinear open-loop controller. In addition, this approach is model-based, and it can be applied thanks to the accurate models of the muscles, the platform and the servovalves, experimentally developed. In addition to the flatness-based controller, which is mainly a feedforward control, a proportional-integral (PI) controller is added in order to overcome the modeling errors and to improve the control robustness. Second, we solve the overactuation of the platform by an adequate choice for the range of the efforts applied by the muscles. In this paper, we recall the basics of this control technique and then show how it is applied to the proposed experimental platform. At the end of the paper, the proposed approach is compared to the most commonly used control method, and its effectiveness is shown by means of experimental results.

Comparison of Active and Hybrid Vibration Confinement With Conventional Active Vibration Control

1999 ◽  
Author(s):  
Lawrence R. Corr ◽  
William W. Clark
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Numerical Study ◽  
Active Vibration Control ◽  
Piezoelectric Actuators ◽  
Control Technique ◽  
Flexible Beam ◽  
Velocity Feedback ◽  
Active Vibration ◽  
Piezoelectric Actuators And Sensors

Abstract This paper presents a numerical study in which active and hybrid vibration confinement is compared with a conventional active vibration control method. Vibration confinement is a vibration control technique that is based on reshaping structural modes to produce “quiet areas” in a structure as opposed to adding damping as in conventional active or passive methods. In this paper, active and hybrid confinement is achieved in a flexible beam with two pairs of piezoelectric actuators and sensors and with two vibration absorbers. For comparison purposes, active damping is achieved also with two pairs of piezoelectric actuators and sensors using direct velocity feedback. The results show that both approaches are effective in controlling vibrations in the targeted area of the beam, with direct velocity feedback being slightly more cost effective in terms of required power. When combined with passive confinement, however, each method is improved with a significant reduction in required power.

Study on DPC-SVM Rectifier Based on Power Feedforward

2011 ◽  
Vol 383-390 ◽  
pp. 6942-6947
Author(s):  
Zhang Fei Zhao ◽  
Guo Jun Tan ◽  
Meng Liu ◽  
Guo Zhen Chen ◽  
Zheng Wang
Keyword(s):  
Control Method ◽  
Feedforward Control ◽  
Dynamic Performance ◽  
Response Speed ◽  
Mathematic Model ◽  
System Response ◽  
Pwm Rectifier ◽  
Vector Modulation ◽  
Control Principle ◽  
The Impact

In this paper, on the basis of the mathematic model of the three-level PWM rectifier, a power feedforward based control strategy is proposed combining with direct power control with space vector modulation (DPC-SVM) control principle. Feedforward control can reduce or even eliminate the impact on the system causing by load disturbance to improve dynamic performance. The simulation results show that the control method makes the system response speed faster and the dynamic performance better, it largely improved the system rectifier capacity against load disturbances.

A Fuzzy Control Method Combined with Optimal Feed-Forward for Dry Desulfurization of Slurry Fluidized Bed Boiler

2012 ◽  
Vol 610-613 ◽  
pp. 1676-1681
Author(s):  
Ai Peng Jiang ◽  
Qiang Ding ◽  
Jian Wang ◽  
Weiwei Lin ◽  
Zhou Shu Jiang
Keyword(s):  
Fuzzy Control ◽  
Fluidized Bed ◽  
Control Method ◽  
Fuzzy Controller ◽  
Coal Slurry ◽  
Control Technology ◽  
Control Effect ◽  
Feed Forward ◽  
Optimal Feed ◽  
The Impact

It is the most effective resource use practices for coal slurry to be used as fuel for fluidized bed boiler. The dry desulfurization of slurry fluidized bed boiler is a large time delay system, and the load disturbance of this system changes frequently. In order to achieve stable control of SO2 emission and meet environmental requirements, a fuzzy control technology combined with the optimal feed-forward was designed. Combined with field experience, a fuzzy controller system was designed by fuzzy control technology, and then the integral process was added to achieve non-error track. To reduce the impact of desulfurizer and other factors, based on the principle of feed-forward, an objective to minimize disturbance impact was obtained, and then a nonlinear programming problem for solving the optimal feed-forward parameters was established, from which the best feed-forward form can be obtained. Results of 440T/H fluidized bed boiler show that the proposed method has satisfactory control effect. SO2 concentration can fully meet environmental emission requirements, and its fluctuation is relatively small.

scholarly journals Quality Control of Accumulated Fields by Applying Spatial and Temporal Constraints

2013 ◽  
Vol 30 (4) ◽  
pp. 745-758 ◽  
Author(s):  
Valliappa Lakshmanan ◽  
Madison Miller ◽  
Travis Smith
Keyword(s):  
Quality Control ◽  
Control Method ◽  
Simulated Data ◽  
Control Technique ◽  
Multiple Hypothesis Tracking ◽  
Real World Datasets ◽  
The Individual ◽  
Quality Control Technique ◽  
Processing Techniques ◽  
The Impact

Abstract Accumulating gridded fields over time greatly magnifies the impact of impulse noise in the individual grids. A quality control method that takes advantage of spatial and temporal coherence can reduce the impact of such noise in accumulation grids. Such a method can be implemented using the image processing techniques of hysteresis and multiple hypothesis tracking (MHT). These steps are described in this paper, and the method is applied to simulated data to quantify the improvements and to explain the effect of various parameters. Finally, the quality control technique is applied to some illustrative real-world datasets.

scholarly journals Dynamic Torque Coordinated Control Considering Engine Starting Conditions for a Power-Split Plug-in Hybrid Electric Vehicle

2021 ◽  
Vol 11 (5) ◽  
pp. 2085
Author(s):  
Yanzhao Su ◽  
Minghui Hu ◽  
Jin Huang ◽  
Datong Qin ◽  
Chunyun Fu ◽  
...  
Keyword(s):  
Electric Vehicle ◽  
Hybrid Electric Vehicle ◽  
Control Method ◽  
Feedforward Control ◽  
Coordinated Control ◽  
Power Split ◽  
Before And After ◽  
Starting Conditions ◽  
Hybrid Electric ◽  
The Impact

For a power-split plug-in hybrid electric vehicle (PS-PHEV), the control system cannot effectively reduce jerks under some engine-starting conditions due to the pulsating torque of the engine, elastic characteristics of the transmission, battery power limitations, and the limitation of the maximum torque of the motor. To solve this problem, a dynamic torque-coordinated control method considering engine starting conditions (DTCC-ESC) is proposed in this paper. The proposed DTCC-ESC mainly includes three parts: the engine segment active control before and after engine ignition to minimize the impact of the engine ripple torque on the shocks of the powertrain system; the feedforward control of the engine starting conditions and the feedback control of the engine’s optimal target speed; and the active damping feedback compensation control for system resonance to reduce system vibrations. The results show that the proposed DTCC-ESC can effectively improve driving comfort under different engine starting conditions.

Active vibration control for piezoelectricity cantilever beam: an adaptive feedforward control method

2017 ◽  
Vol 26 (4) ◽  
pp. 047003 ◽  
Author(s):  
Qiao Zhu ◽  
Jun-Zhou Yue ◽  
Wei-Qun Liu ◽  
Xu-Dong Wang ◽  
Jun Chen ◽  
...  
Keyword(s):  
Vibration Control ◽  
Cantilever Beam ◽  
Control Method ◽  
Feedforward Control ◽  
Active Vibration Control ◽  
Active Vibration ◽  
Adaptive Feedforward

Impact of Corporate Governance on the Cash Holding of the Firms: An Empirical Study of Indian Manufacturing Sector

GIS Business ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. 47-52
Author(s):  
Karam Pal Narwal ◽  
Sonia Jindal
Keyword(s):  
Corporate Governance ◽  
Audit Committee ◽  
Manufacturing Sector ◽  
Control Variable ◽  
Cash Holding ◽  
Executive Directors ◽  
Control Effect ◽  
Board Size ◽  
Indian Manufacturing Sector ◽  
The Impact

The paper empirically examines the impact of corporate governance on the cash holding of the firms. The components of corporate governance are measured by board size, board meeting, audit committee members, directors remuneration and non executive directors and the cash holding is measured with the log of average cash and size is taken as control variable for the control effect on the dependent variables. Moreover, correlation and panel regression model were employed to examine the relationship between the corporate governance and cash holding. Empirical data was collected from 96 firms over the period of 2004-05 to 2013-14. The results show that directors remuneration and the number of audit committee members positively influence the cash holding and the board size also positively influences the cash holding whereas, the non executive directors and the board meetings do not play any role in enhancing the cash holding.

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