Gyrostabilizer Vehicular Technology

2011 ◽  
Vol 64 (1) ◽  
Author(s):  
Nicholas C. Townsend ◽  
Ramanand A. Shenoi
Keyword(s):  
Control Strategies ◽  
Equations Of Motion ◽  
Effective Means ◽  
Detailed Examination ◽  
Current State ◽  
Wide Range ◽  
Dynamics And Control ◽  
And Control ◽  
Gyroscopic Systems ◽  
Vehicular Technology

This paper examines the current state of gyrostabilizer vehicular technology. With no previous description of the wide range and variety of gyrostabilizer technology, this paper provides a review of the current state of the art. This includes a detailed examination of gyrostabilizer vehicular systems, dynamics and control. The present review first describes the historical development of gyroscopic systems before going on to describe the various system characteristics, including an overview of gyrostabilizer vehicular applications and system designs for land, sea and spacecraft. The equations of motion for generic gyroscopic systems are derived following momentum (Newton-Euler) and energy (Lagrange) based approaches and examples provided. The derivations are made generically for individual components, enabling direct application for a wide variety of systems. In the final section, a review of gyrostabilizer control strategies is presented and the remaining challenges are discussed. Gyrostabilizer systems are anticipated to become more widely adopted as they provide an effective means of motion control with several significant advantages for land, sea and spacecraft. (101 references).

A Methodology for Identifying Ergonomics Risk Factors and Measuring the Results of Implementation of Corrective Actions

1997 ◽  
Vol 41 (1) ◽  
pp. 717-721
Author(s):  
Marilyn Joyce ◽  
Andrew J. Marcotte ◽  
Richard Barker ◽  
Edward J. Klinenberg
Keyword(s):  
Risk Factors ◽  
Air Force ◽  
Developmental Process ◽  
Control Strategies ◽  
Effective Means ◽  
The United States ◽  
Wide Range ◽  
Office Environments ◽  
And Control ◽  
Administrative Tasks

A methodology for identifying ergonomics risk factors and control strategies in office environments has been developed and pilot tested. Developed as part of an overall ergonomics program being implemented by the United States Air Force, the employees impacted include both civilian and military personnel performing a wide range of administrative tasks typically performed in offices. The research design included: a focused literature review; strategic site visits; and review of criteria established by the Air Force; an iterative developmental process of a Screening Survey and an Ergonomics Assessment Methodology Guide; and testing. The results indicate that the process can be used as an effective means for identifying and controlling ergonomics hazards in administrative work areas.

scholarly journals Wolbachia: endosymbiont of onchocercid nematodes and their vectors

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Ranju Ravindran Santhakumari Manoj ◽  
Maria Stefania Latrofa ◽  
Sara Epis ◽  
Domenico Otranto
Keyword(s):  
Control Strategies ◽  
Molecular Data ◽  
Scientific Data ◽  
Growth And Survival ◽  
Vector Borne Diseases ◽  
Wide Range ◽  
Veterinary Importance ◽  
Wolbachia Endosymbiont ◽  
Vector Borne ◽  
And Control

Abstract Background Wolbachia is an obligate intracellular maternally transmitted, gram-negative bacterium which forms a spectrum of endosymbiotic relationships from parasitism to obligatory mutualism in a wide range of arthropods and onchocercid nematodes, respectively. In arthropods Wolbachia produces reproductive manipulations such as male killing, feminization, parthenogenesis and cytoplasmic incompatibility for its propagation and provides an additional fitness benefit for the host to protect against pathogens, whilst in onchocercid nematodes, apart from the mutual metabolic dependence, this bacterium is involved in moulting, embryogenesis, growth and survival of the host. Methods This review details the molecular data of Wolbachia and its effect on host biology, immunity, ecology and evolution, reproduction, endosymbiont-based treatment and control strategies exploited for filariasis. Relevant peer-reviewed scientic papers available in various authenticated scientific data bases were considered while writing the review. Conclusions The information presented provides an overview on Wolbachia biology and its use in the control and/or treatment of vectors, onchocercid nematodes and viral diseases of medical and veterinary importance. This offers the development of new approaches for the control of a variety of vector-borne diseases. Graphic Abstract

scholarly journals Design of Tendon-Driven Manipulators

1995 ◽  
Vol 117 (B) ◽  
pp. 80-86 ◽  
Author(s):  
Lung-Wen Tsai
Keyword(s):  
State Of The Art ◽  
Unique Characteristic ◽  
Current State ◽  
Dynamics And Control ◽  
And Control

This paper presents an overview of the current state-of-the-art in the design of tendon-driven manipulators. A special characteristic associated with tendon-driven manipulators is that tendons can only exert tension but not compression. Based on this unique characteristic, the fundamental mechanics associated with the design of tendon-driven manipulators are reviewed. The review includes structure classification, kinematics, statics, dynamics and control.

The Current Situation and Progress of 4-DOF Parallel Robot

2010 ◽  
Vol 37-38 ◽  
pp. 1433-1436 ◽  
Author(s):  
Yan Qing Wang ◽  
Gao Yan Zhong ◽  
Yong Biao Chang ◽  
Guo Xin Liu
Keyword(s):  
Unsolved Problem ◽  
Control Strategies ◽  
Parallel Robot ◽  
Current Situation ◽  
Research Trend ◽  
Key Technologies ◽  
Dynamics And Control ◽  
And Control

In this paper, the existing research and key technologies of 4-DOF parallel robot are reviewed, i.e., mechanism, kinematics, singularity, workspace, dexterity, dynamics and control. Most of them are focused on mechanism and kinematics. The study in dynamics and control is relatively rare and not mature in practice, especially in how to optimize the control strategies to improve its performance. Finally, the research trend and unsolved problem of 4-DOF parallel robot is described.

scholarly journals Stochastic epidemic metapopulation models on networks: SIS dynamics and control strategies

2018 ◽  
Vol 449 ◽  
pp. 35-52 ◽  
Author(s):  
Andrew L. Krause ◽  
Lawrence Kurowski ◽  
Kamran Yawar ◽  
Robert A. Van Gorder
Keyword(s):  
Control Strategies ◽  
Stochastic Epidemic ◽  
Dynamics And Control ◽  
Metapopulation Models ◽  
And Control

scholarly journals Forecast Possible Risk for COVID-19 Epidemic Dissemination under Current Control Strategies in Japan

2020 ◽  
Vol 17 (11) ◽  
pp. 3872 ◽  
Author(s):  
Zhongxiang Chen ◽  
Jun Yang ◽  
Binxiang Dai
Keyword(s):  
Confidence Interval ◽  
Prevention And Control ◽  
Control Strategies ◽  
Current Control ◽  
Self Healing ◽  
Current State ◽  
Imported Cases ◽  
The Times ◽  
Robust Measures ◽  
And Control

COVID-19 has globally spread to over 4 million people and the epidemic situation in Japan is very serious. The purpose of this research was to assess the risk of COVID-19 epidemic dissemination in Japan by estimating the current state of epidemic dissemination and providing some epidemic prevention and control recommendations. Firstly, the period from 6 January to 31 March 2020 was divided into four stages and the relevant parameters were estimated according to the imported cases in Japan. The basic reproduction number of the current stage is 1.954 (95% confidence interval (CI) 1.851–2.025), which means COVID-19 will spread quickly, and the self-healing rate of Japanese is about 0.495 (95% CI 0.437–0.506), with small variations in the four stages. Secondly, the results were applied to the actual reported cases from 1 to 5 April 2020, verifying the reliability of the estimated data using the accumulated reported cases located within the 95% confidence interval and the relative error of forecast data of five days being less than 2.5 % . Thirdly, considering the medical resources in Japan, the times the epidemic beds and ventilators become fully occupied are predicted as 5 and 15 May 2020, respectively. Keeping with the current situation, the final death toll in Japan may reach into the millions. Finally, based on experience with COVID-19 prevention and control in China, robust measures such as nationwide shutdown, store closures, citizens isolating themselves at home, and increasing PCR testing would quickly and effectively prevent COVID-19 spread.

Electrospinning Nanofibers: Measurements, Dynamics, and Control Strategy Development

2014 ◽  
Author(s):  
Yunshen Cai ◽  
Michael Gevelber
Keyword(s):  
Controller Design ◽  
Fiber Diameter ◽  
Operating Regime ◽  
Strategy Development ◽  
Process Conditions ◽  
Control Approach ◽  
Process Dynamics ◽  
Wide Range ◽  
Dynamics And Control ◽  
And Control

Electrospinning produces submicron fibers for a variety of applications using a wide range of polymers. Achieving the desired fiber diameter, maximizing productivity, and minimizing variation are important production objectives. This paper addresses several important areas needed to develop a general electrospinning control approach including: developing a correlation between measurements, process conditions, and the resulting fiber diameter, developing a method to determine an operating regime that meets manufacturing objectives, and identifying process dynamics for controller design.

Process Dynamics and Control Analysis for Electrospinning Nanofibers

2010 ◽  
Author(s):  
Xuri Yan ◽  
Michael Gevelber
Keyword(s):  
Fiber Diameter ◽  
Electrospinning Process ◽  
Open Loop ◽  
Diameter Distribution ◽  
Control Analysis ◽  
Process Dynamics ◽  
Current State ◽  
Dynamics And Control ◽  
Process Reproducibility ◽  
And Control

In many emerging, high value electrospinning applications, the diameter distribution of electrospun fibers has important implications for the product’s performance and process reproducibility. However, the current state-of-the-art electrospinning process results in diameter distribution variations, both during a run and run-to-run. To address these problems, a vision-based, open loop system has been developed to better understand the process dynamics. The effects of process parameters on fiber diameter distributions are investigated, process dynamics are identified, and the relation between measurable variables and the resulting fiber diameter distribution is analyzed.

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