scholarly journals Optimal Splines for Rigid Motion Systems: Benchmarking and Extensions

2009 ◽  
Vol 131 (10) ◽  
Author(s):  
B. Demeulenaere ◽  
J. De Caigny ◽  
G. Pipeleers ◽  
J. De Schutter ◽  
J. Swevers
Keyword(s):  
Convex Programming ◽  
Case Studies ◽  
Rigid Motion ◽  
Companion Paper ◽  
Upper And Lower Bounds ◽  
Driven Systems ◽  
Programming Framework ◽  
Optimization Study ◽  
Driven System ◽  
Time Optimal

This paper illustrates the power and versatility of the convex programming framework for optimal spline synthesis that was developed in a companion paper (Demeulenaere, Pipeleers, De Caigny, Swevers, De Schutter, and Vandenberghe, 2009, “Optimal Spines for Rigid Motion Systems: A Convex Programming Framework”, ASME J. Mech. Des., 131, p. 101005.). Two case studies concerning rigid motion systems illustrate the ability of the framework to improve upon recent (2005) literature results: (i) a numerical optimization study concerning kinematic optimization of uniform quintic splines for cam systems and (ii) an analytical study concerning time optimal quartic splines for motion systems driven by servomotors and subject to kinematic constraints. In a third study, the versatility of the framework is illustrated by generating time optimal and time-energy optimal motions for a rigid servomotor driven system under torque constraints. Based on these three case studies, the convex programming framework of the companion paper is extended with the following generic aspects: (i) a bisection to generate time optimal motions, (ii) a direct expression of the upper and lower bounds on motor torque, and (iii) a convex quadratic energy objective function for servomotor driven systems.

Design and Application of Task Scheduling Module Based on Priority Table Query in Wireless Sensor Network Node

2014 ◽  
Vol 536-537 ◽  
pp. 731-734
Author(s):  
Kang Hong Duan ◽  
Li Ting Zhang ◽  
Long Ma ◽  
Hong Xin Zhang
Keyword(s):  
Wireless Sensor Network ◽  
Sensor Network ◽  
Task Scheduling ◽  
Wireless Sensor ◽  
Network Node ◽  
Driven Systems ◽  
Driven System ◽  
Event Driven ◽  
Time Critical ◽  
Priority Table

Event-driven systems and thread-driven systems are two major design philosophies of operating system in wireless sensor networks. Systems based on multi-threaded are more timeliness than the event-driven systems, which can meet the requirements of time-critical tasks by means of task preemption, while systems based on event-driven are more energy efficient.The article introduces a task scheduling module in event-driven system. The module takes a kind of priority table query method to choose the most important task with highest priority to schedule.It is seen that the module is suitable wireless sensor network.

Electro-Mechanically Integrated Circuit Models for DC Motor Driven Systems

2011 ◽  
Vol 301-303 ◽  
pp. 1652-1657
Author(s):  
Chi Hsiang Lin
Keyword(s):  
Power System ◽  
Mechanical System ◽  
Integrated Circuit ◽  
Electrical Power ◽  
Dc Motor ◽  
Circuit Model ◽  
Electrical Power System ◽  
Driven Systems ◽  
Mechanical Parts ◽  
Driven System

DC motor driven systems include both the electrical and mechanical parts, leading to parameters changes because of interactions. An example is the torsional modes of drive train, which frequencies might be different with and without taking into account the electrical power system. Therefore, in this paper, we propose an electromechanically integrated circuit model to overcome the difficulty. Sinse the whole-circuit model can be used to modify the mode frequencies obtained from tests on a mechanical system alone, it will be a good testing support for a DC motor driven system.

Dynamic mode performance evaluation and energy analysis of mains and inverter driven refrigeration compressors

1997 ◽  
Vol 211 (4) ◽  
pp. 339-346 ◽  
Author(s):  
S A Tassou ◽  
T Q Qureshi
Keyword(s):  
Energy Savings ◽  
Energy Analysis ◽  
Test Facility ◽  
Dynamic Mode ◽  
Variable Speed ◽  
Refrigeration System ◽  
Driven Systems ◽  
Design Load ◽  
Start Up ◽  
Driven System

In this study the dynamic mode performance of an inverter driven and direct mains driven compressor has been evaluated using a laboratory-based test facility. The aim was to investigate the influence of the inverter on the start-up performance of a refrigeration system and quantify and compare start-up losses for the two modes of operation. The results indicate that an inverter driven system incurs approximately 5 per cent higher start-up losses than a direct mains driven system. This is mainly due to the ‘soft’ starting capabilities of the inverter (gradual acceleration of the motor). An energy analysis of fixed speed and inverter driven refrigeration systems in air-conditioning applications has shown that despite the additional start-up transient losses of inverter driven systems they lead to higher seasonal efficiencies than fixed-speed systems. This arises from improved steady state performance during low-speed operation at loads below the design load of the system. It has been found that the level of energy savings is a function of the type of compressor employed in the variable-speed system.

Static Characteristics of a New Three-Dimensional Linear Homeomorphic Saccade Model

2018 ◽  
Vol 28 (03) ◽  
pp. 1750049
Author(s):  
Wei Zhou ◽  
Xiu Zhai ◽  
Alireza Ghahari ◽  
G. Alex Korentis ◽  
David Kaputa ◽  
...  
Keyword(s):  
Elastic Element ◽  
Three Dimensional ◽  
Saccadic Eye Movements ◽  
Companion Paper ◽  
Pulley System ◽  
Neural Input ◽  
Plant Uses ◽  
Time Optimal ◽  
Identification Technique ◽  
Parameter Values

A linear homeomorphic saccade model that produces 3D saccadic eye movements consistent with physiological and anatomical evidence is introduced. Central to the model is the implementation of a time-optimal controller with six linear muscles and pulleys that represent the saccade oculomotor plant. Each muscle is modeled as a parallel combination of viscosity [Formula: see text] and series elasticity [Formula: see text] connected to the parallel combination of active-state tension generator [Formula: see text], viscosity element [Formula: see text], and length tension elastic element [Formula: see text]. Additionally, passive tissues involving the eyeball include a viscosity element [Formula: see text], elastic element [Formula: see text], and moment of inertia [Formula: see text]. The neural input for each muscle is separately maintained, whereas the effective pulling direction is modulated by its respective mid-orbital constraint from the pulleys. Initial parameter values for the oculomotor plant are based on anatomical and physiological evidence. The oculomotor plant uses a time-optimal, 2D commutative neural controller, together with the pulley system that actively functions to implement Listing’s law during both static and dynamic conditions. In a companion paper, the dynamic characteristics of the saccade model is analyzed using a time domain system identification technique to estimate the final parameter values and neural inputs from saccade data. An excellent match between the model estimates and the data is observed, whereby a total of 20 horizontal, 5 vertical, and 64 oblique saccades are analyzed.

scholarly journals Multi-core synthesis and maximum satisfiability applied to optimal sizing of solar photovoltaic systems

2021 ◽  
Author(s):  
Alessandro Trindade ◽  
Edilson Galvão ◽  
Lucas Cordeiro
Keyword(s):  
Case Studies ◽  
Life Cycle Cost ◽  
Optimal Solution ◽  
Electrical Equipment ◽  
Simulation Software ◽  
Photovoltaic Systems ◽  
Suitable Alternative ◽  
Grid Systems ◽  
Optimal Sizing ◽  
Time Optimal

<pre>Annual global energy consumption growth is around 1.3% with forecasts until 2040. Photovoltaic systems became a suitable alternative to nuclear and fossil energy generation. In order to support this technology's dissemination, we develop and evaluate an automated formal synthesis approach that assists in decision-making for off-grid systems. Our proposed approach, called PVz, is based on a variant of the counterexample-guided inductive synthesis; it has a multi-core feature, which can obtain the optimal sizing of photovoltaic systems focusing on Life Cycle Cost analysis. Given the electrical needs of a home, we seek a set of electrical equipment with the best possible combination of devices that meet the specified requirements. We calculate all costs related to maintenance over 20 years. The results presented are based on seven case studies; some of them are real ones from the Amazon region in Brazil. The same case studies were solved by a commercial optimization tool. Our technique and the commercial tool results were validated with popular simulation software to perform a fair comparison. Furthermore, we analyze some topics such as run-time, optimal solution, and configuration of the resulting systems. We claim that our technique is advantageous compared to the existing approaches in the literature.</pre>p, li { white-space: pre-wrap; }

A Composite Micromechanical Model for Connective Tissues: Part I—Theory

1992 ◽  
Vol 114 (1) ◽  
pp. 137-141 ◽  
Author(s):  
H. K. Ault ◽  
A. H. Hoffman
Keyword(s):  
Soft Tissues ◽  
Micromechanical Model ◽  
Companion Paper ◽  
Material Behavior ◽  
Upper And Lower Bounds ◽  
Connective Tissues ◽  
Basic Model ◽  
Component Material ◽  
Minimum Potential ◽  
Tail Tendon

A micromechanical model has been developed to study and predict the mechanical behavior of fibrous soft tissues. The model uses the theorems of least work and minimum potential energy to predict upper and lower bounds on material behavior based on the structure and properties of tissue components. The basic model consists of a composite of crimped collagen fibers embedded in an elastic glycosaminoglycan matrix. Upper and lower bound aggregation rules predict composite material behavior under the assumptions of uniform strain and uniform stress, respectively. Input parameters consist of the component material properties and the geometric configuration of the fibers. The model may be applied to a variety of connective tissue structures and is valuable in giving insight into material behavior and the nature of interactions between tissue components in various structures. Application of the model to rat tail tendon and cat knee joint capsule is described in a companion paper [2].

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