Active control of a Vertical Conveyor System via Negative cubic velocity feedback through Simultaneous resonance

2021 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Ebtssam Elemam ◽  
Y. A. Amer ◽  
A.T. EL-Sayed
Keyword(s):  
Active Control ◽  
Velocity Feedback ◽  
Conveyor System ◽  
Vertical Conveyor

Active Control of a Circular Membrane to Reduce Transient Noise Transmission

1995 ◽  
Vol 117 (3A) ◽  
pp. 252-258 ◽  
Author(s):  
J. L. van Niekerk ◽  
B. H. Tongue
Keyword(s):  
Feedback Control ◽  
Active Control ◽  
Sliding Mode ◽  
Control Strategies ◽  
Circular Membrane ◽  
Velocity Feedback ◽  
Circular Duct ◽  
Control Approach ◽  
Noise Transmission

An active control approach that reduces transient noise transmission through a membrane in a circular duct is presented. Discrete sections of piezo-electrical film, PVDF, are used as actuators to adjust the tension of the membrane. Different control strategies, such as optimal, sliding mode and velocity feedback control, are investigated analytically and then implemented experimentally. It is shown that velocity feedback control is the more effective, stable controller for this application.

scholarly journals Mathematical Modeling of the Weight of Grain Straw During Conveying in Vertical Conveying Reaper Windrow

2020 ◽  
Author(s):  
Getaw Ayay Tefera
Keyword(s):  
Feeding Rate ◽  
Angular Speed ◽  
Total Weight ◽  
Gravitational Acceleration ◽  
Belt Conveyor ◽  
Working Mechanism ◽  
Arithmetic Sequence ◽  
Conveyor System ◽  
Vertical Conveyor ◽  
The Mathematical Model

Abstract Analyzing the total weight of cut straws inside the conveyor is important in a vertical conveyor reapers machines to optimize the supply energy into the lugged belt conveyor system. This weight was mathematically modeled by considering the working mechanism of vertical conveyor reapers machines, corelating feeding rate of cut straws from cutter to conveyor and conveying rates of lugged belt conveyor. Then the mathematical model for total weight was defined by determining numbers of cut straws in front of each cutters or knives. The defined equation shows that the feed rate of cut straws into the conveyor is in arithmetic sequence fashion with equal initial value and common difference. The total weight of cut straws equation is an arithmetic series with positive common difference. The equation also shows that the numbers of cut straws in the conveyor increased in arithmetic progression when the numbers of cutters or knives increased. In general, the weight of cut straws in conveyor depends on mass of straw, gravitational acceleration, numbers of cutters or knives, forward speed of reaper, spacing of lugs, angular speed of conveyor pulley, diameter of conveyor pulley and diameter of straw.

Time Delayed Negative Velocity Feedback Design for Active Control of Structures

2005 ◽  
Author(s):  
Phailaung Phohomsiri ◽  
Firdaus E. Udwadia
Keyword(s):  
Feedback Control ◽  
Active Control ◽  
Time Delays ◽  
Control Design ◽  
System Stability ◽  
Ground Acceleration ◽  
Velocity Feedback ◽  
Significant Time ◽  
Control Methodology ◽  
Delayed Control Systems

In this paper, we present velocity feedback control design with significant time delays for the active control of structures. Because of the presence of significant time delays, we study the infinite dimensionality of the system with time-delayed control and introduce the concept of the so-called non-system poles. Analytical results related to performance and stability analysis of the new control design are provided. The non-system poles are shown to influence both system stability and system performance and cannot therefore be ignored in time-delayed control systems. We then apply the time delayed negative velocity feedback control methodology to a single-degree-of-freedom system subjected to random ground acceleration. The numerical results show good stability characteristics and effective behavior of the proposed control methodology.

Time-Delayed Positive Velocity Feedback Control Design for Active Control of Structures

2006 ◽  
Vol 132 (6) ◽  
pp. 690-703 ◽  
Author(s):  
Phailaung Phohomsiri ◽  
Firdaus E. Udwadia ◽  
Hubertus F. von Bremen
Keyword(s):  
Feedback Control ◽  
Active Control ◽  
Control Design ◽  
Velocity Feedback

scholarly journals SEMI-ACTIVE PREDICTIVE CONTROL OF STRUCTURES WITH CONTROLLED STIFFNESS DEVICES AND VARIABLE FRICTION DAMPER SYSTEM

2010 ◽  
Vol 13 (4) ◽  
pp. 64-73
Author(s):  
Thang Quoc Chu ◽  
Hoa Nhan Pham ◽  
Ben Van Tran
Keyword(s):  
Active Control ◽  
Predictive Control ◽  
Control Algorithms ◽  
Friction Damper ◽  
Velocity Feedback ◽  
Numerical Examples ◽  
Acceleration Feedback ◽  
Variable Friction ◽  
Instantaneous Control

This paper presents two active control algorithms (Instantaneous Control with Displacement and Velocity Feedback (ICDVF) and Instantaneous Control with Velocity and Acceleration Feedback (ICAVF)) to control the structures eqquiped Controlled Stiffness Devices and Variable Friction Damper System. The numerical examples aim to evaluate the effect structure’s response reductions between the two algorithms as well as the principal and accessory role.

scholarly journals Mathematical Modeling of The Weight of Grain Straw during Conveying in Vertical Conveying Reaper Windrow

2020 ◽  
Author(s):  
Getaw Ayay Tefera
Keyword(s):  
Feeding Rate ◽  
Angular Speed ◽  
Total Weight ◽  
Gravitational Acceleration ◽  
Belt Conveyor ◽  
Working Mechanism ◽  
Arithmetic Sequence ◽  
Conveyor System ◽  
Vertical Conveyor ◽  
The Mathematical Model

Abstract Analyzing the total weight of cut straws inside the conveyor is important in a vertical conveyor reapers machines to optimize the supply energy into the lugged belt conveyor system. This weight was mathematically modeled by considering the working mechanism of vertical conveyor reapers machines, corelating feeding rate of cut straws from cutter to conveyor and conveying rates of lugged belt conveyor. Then the mathematical model for total weight was defined by determining numbers of cut straws in front of each cutters or knives. The defined equation shows that the feed rate of cut straws into the conveyor is in arithmetic sequence fashion with equal initial value and common difference. The total weight of cut straws equation is an arithmetic series with positive common difference. The equation also shows that the numbers of cut straws in the conveyor increased in arithmetic progression when the numbers of cutters or knives increased. In general, the weight of cut straws in conveyor depends on mass of straw, gravitational acceleration, numbers of cutters or knives, forward speed of reaper, spacing of lugs, angular speed of conveyor pulley, diameter of conveyor pulley and diameter of straw.

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