Model-based Control Strategies for Anaerobic Digestion Processes

In this paper we consider a four-dimensional bioreactor model, describing an anaerobic wastewater treatment with methane production. Different control strategies for stabilizing the dynamics are presented and discussed. A general and practice-oriented bounded open-loop control is proposed, aimed to steer the model solutions towards an a priori given set in thephase plane.

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A review of open loop control strategies for shades, blinds and integrated lighting by use of real-time daylight prediction methods

Building and Environment ◽

10.1016/j.buildenv.2018.03.018 ◽

2018 ◽

Vol 135 ◽

pp. 352-364 ◽

Cited By ~ 25

Author(s):

Sneha Jain ◽

Vishal Garg

Keyword(s):

Real Time ◽

Control Strategies ◽

Open Loop ◽

Prediction Methods ◽

Open Loop Control ◽

Loop Control

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A Method for Teaching Feedback Control Using the Enhanced Mass-Spring-Damper System

ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control, Volume 1 ◽

10.1115/dscc2011-6158 ◽

2011 ◽

Author(s):

Dean H. Kim

Keyword(s):

Feedback Control ◽

Control Strategies ◽

Open Loop ◽

Open Loop Control ◽

Improve Performance ◽

Loop Control ◽

System Input ◽

Advanced Controls ◽

Mass Spring ◽

Force Generator

This paper presents a method that the author has developed to teach students about the need for feedback control and to facilitate the understanding of controller implementation. The initial discussion focuses on the limitations of open-loop control to improve performance of the traditional mass-spring-damper system. The key contribution is the introduction of an enhanced mass-spring-damper system with a position sensor and force generator, resulting in voltages as system input and output. This enhanced system provides a foundation for discussion of basic feedback control strategies such as PID-Control in addition to advanced controls concepts. The analysis is provided in time-domain to facilitate the understanding of these important controls concepts.

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In-Hand Manipulation Primitives for a Minimal, Underactuated Gripper With Active Surfaces

Volume 5A: 40th Mechanisms and Robotics Conference ◽

10.1115/detc2016-60354 ◽

2016 ◽

Cited By ~ 2

Author(s):

Raymond R. Ma ◽

Aaron M. Dollar

Keyword(s):

A Priori ◽

Open Loop ◽

Object Motion ◽

A Priori Knowledge ◽

Open Loop Control ◽

Loop Control ◽

Grasp Stability ◽

Control Schemes ◽

And Control ◽

Underactuated Finger

Dexterous in-hand manipulation tasks have been difficult to execute, even with highly complex hands and control schemes, as the object grasp stability needs to be maintained while it is displaced in the hand workspace. Researchers have shown that underactuated, adaptive hand designs can effectively immobilize objects with simple, open-loop, but there have been few cases where underactuation has been leveraged to enhance in-hand manipulation. In this work, we investigate the performance of a gripper utilizing a thumb with an active, belt-driven, conveyor surface and an opposing, underactuated finger with passive rollers, for a variety of manipulation tasks and range of objects. We show that consistent, repeatable object motion can be obtained while ensuring a rigid grasp without a priori knowledge of the object geometry or contact locations, due to the adaptive qualities of underactuated design. Many dexterous in-hand manipulation examples with their anthropomorphic equivalents are examined, and simple, open-loop control schemes to optimize the repeatability of these tasks are proposed.

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Turbulent boundary layer under the control of different schemes

Proceedings of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rspa.2017.0038 ◽

2017 ◽

Vol 473 (2202) ◽

pp. 20170038 ◽

Cited By ~ 3

Author(s):

Z. X. Qiao ◽

Y. Zhou ◽

Z. Wu

Keyword(s):

Boundary Layer ◽

Turbulent Boundary Layer ◽

High Speed ◽

Control Strategies ◽

Local Maximum ◽

Open Loop ◽

Open Loop Control ◽

Feed Forward ◽

Loop Control ◽

Combined Feed

This work explores experimentally the control of a turbulent boundary layer over a flat plate based on wall perturbation generated by piezo-ceramic actuators. Different schemes are investigated, including the feed-forward, the feedback, and the combined feed-forward and feedback strategies, with a view to suppressing the near-wall high-speed events and hence reducing skin friction drag. While the strategies may achieve a local maximum drag reduction slightly less than their counterpart of the open-loop control, the corresponding duty cycles are substantially reduced when compared with that of the open-loop control. The results suggest a good potential to cut down the input energy under these control strategies. The fluctuating velocity, spectra, Taylor microscale and mean energy dissipation are measured across the boundary layer with and without control and, based on the measurements, the flow mechanism behind the control is proposed.

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Open Loop Control Strategies for Plasma Scenarios: Linear and Nonlinear Techniques for Configuration Transitions

Proceedings of the 45th IEEE Conference on Decision and Control ◽

10.1109/cdc.2006.377412 ◽

2006 ◽

Cited By ~ 2

Author(s):

Massimiliano Mattei ◽

Raffaele Albanese ◽

Giuseppe Ambrosino ◽

Alfredo Portone

Keyword(s):

Control Strategies ◽

Open Loop ◽

Open Loop Control ◽

Loop Control ◽

Linear And Nonlinear

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Microassembly via Coordinated Manipulation of Objects Using a Multifingered Micromanipulator

Volume 11: Nano and Micro Materials, Devices and Systems; Microsystems Integration ◽

10.1115/imece2011-65802 ◽

2011 ◽

Author(s):

Christopher Pelzmann ◽

Laxman Saggere

Keyword(s):

Closed Loop ◽

State Of The Art ◽

Control Strategies ◽

Open Loop ◽

Open Loop Control ◽

Multiple Objects ◽

Loop Control ◽

Micro Scale ◽

Novel Approach ◽

On Chip

This paper presents a novel approach to manipulation and assembly of micro-scale objects using a chip-scale multi-fingered micromanipulator, in which multiple, independently controlled compliant fingers coordinate with each other to grasp and manipulate multiple objects simultaneously on-chip. The structural and functional advantages of this multi-fingered micromanipulator in achieving high dexterity in a compact form as compared to other state-of-the-art manipulation tools are discussed. A formulation of the kinematics of the manipulator’s compliant fingers along with two different control strategies including an operator-driven closed-loop control and a semi-autonomous open-loop control for coordinated manipulation and on-chip assembly of micro-scale objects are introduced. Finally, the details of implementation of both control strategies and successful experimental demonstration of manipulations and assembly of two interlocking micro-scale parts with sub-micron mating clearance using the multifingered manipulator are presented.

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