scholarly journals Maintenance Accessibility Evaluation Method based on D-H Model and Comfort in a Virtual Maintenance Environment

2021 ◽  
Author(s):  
Dong Zhou ◽  
Hongduo Wu ◽  
Ziyue Guo ◽  
Qidi Zhou ◽  
Yuning Liang
Keyword(s):  
Virtual Environment ◽  
Human Body ◽  
Evaluation System ◽  
Degrees Of Freedom ◽  
Evaluation Method ◽  
Evaluation Tool ◽  
Envelope Surface ◽  
Accessibility Evaluation ◽  
Virtual Maintenance ◽  
Surface Construction

Abstract In virtual maintenance, the most widely used accessibility evaluation method is to use virtual human reach envelope surface to judge and evaluate accessibility. However, this method can only give two kinds of evaluation results: reachable and unreachable. There is not enough data and theoretical support for the construction of envelope surface, and the precision and accuracy of evaluation need to be improved. In this paper, a parameterized accessibility evaluation method and a method of accessibility envelope surface construction are proposed. Firstly, to objectively describe the movement of human body, a 6-joint and 5-link D-H (Denavit-Hartenberg) link model is established from the waist to the fingertip of the human body, and the ranges of 10 degrees of freedom and angles related to accessibility are determined according to ergonomics. Then, comfort is introduced to refine the accessibility evaluation, and a multi-level accessibility evaluation system based on comfort is constructed according to RULA (the rapid upper limb assessment). In order to facilitate the application of this method in virtual environment, a method of accessibility envelope surface construction is proposed. Firstly, the reachable points are generated by Monte Carlo simulation based on the D-H model. Secondly, the accessibility envelope surface is composed of the outermost random reachable points. Finally, the comparison experiment with the reachable envelope provided by DELMIA in virtual environment shows that the proposed method is more accurate, meticulous and objective. Based on this method, an accessibility evaluation tool has been developed in CATIA and has been applied in some scientific research institutes.

scholarly journals Color Image Evaluation for Small Space Based on FA and GEP

2014 ◽  
Vol 2014 ◽  
pp. 1-11
Author(s):  
Li Deng ◽  
Sui-Huai Yu ◽  
Wen-Jun Wang ◽  
Jun-Xuan Chen ◽  
Guo-Chang Liu
Keyword(s):  
Evaluation System ◽  
Frequency Conversion ◽  
Evaluation Method ◽  
Color Image ◽  
Gene Expression Programming ◽  
Image Evaluation ◽  
Evaluation Tool ◽  
Small Space ◽  
Entropy Weight ◽  
Fast Evaluation

Aiming at the problem that color image is difficult to quantify, this paper proposes an evaluation method of color image for small space based on factor analysis (FA) and gene expression programming (GEP) and constructs a correlation model between color image factors and comprehensive color image. The basic color samples of small space and color images are evaluated by semantic differential method (SD method), color image factors are selected via dimension reduction in FA, factor score function is established, and by combining the entropy weight method to determine each factor weights then the comprehensive color image score is calculated finally. The best fitting function between color image factors and comprehensive color image is obtained by GEP algorithm, which can predict the users’ color image values. A color image evaluation system for small space is developed based on this model. The color evaluation of a control room on AC frequency conversion rig is taken as an example, verifying the effectiveness of the proposed method. It also can assist the designers in other color designs and provide a fast evaluation tool for testing users’ color image.

scholarly journals Benchmarking construction industry, company and project performance by participants’ evaluation

2016 ◽  
Vol 23 (7) ◽  
pp. 2092-2108 ◽  
Author(s):  
Sami Kärnä ◽  
Juha-Matti Junnonen
Keyword(s):  
Construction Industry ◽  
Evaluation System ◽  
Client Satisfaction ◽  
Evaluation Method ◽  
Project Evaluation ◽  
Evaluation Tool ◽  
Content Type ◽  
Industry Level ◽  
Joint Research Project ◽  
Project Participants

Purpose The construction industry needs effective methods for gathering and utilizing performance information on industry, company and individual project levels. Such benchmarking (BM) information can be collected from project participants’ bi-directional evaluations of each other’s performance during construction projects. The purpose of this paper is to present the method and discuss the features of a multi-company project evaluation system as a BM tool. Also the accumulated results, based on the extensive BM database in the Finnish construction industry, are investigated. Design/methodology/approach The web-based project evaluation tool was established in 2007 as a joint research project between the Helsinki University of Technology, construction organizations and main associations widely representing the construction industry in Finland. The evaluation method is based on soft, subjective measures, such as client satisfaction and project participants’ satisfaction. The empirical observations of the study are based on over 5,500 evaluations during which the BM system was used in the Finnish construction industry. Findings The use of the evaluation is presented as a multi-level BM tool to evaluate the performance of different discipline groups on project, company and industry levels. The Finnish case shows an example of the industry-level performance BMs of project consultants, main contractors, sub-contractors and architects/designers. The BM categories include project management, staff, collaboration and project goal accomplishment. According to the results, the participants are satisfied with each other’s performance. However, main development targets in the Finnish industry are related to risk management and managing design. Also, the development of sub-contractors’ selection procedures will contribute to the performance of the industry. Research limitations/implications The industry-level feedback is linked to the Finnish construction industry. Similar studies in other countries would enable international comparisons. Practical implications Client satisfaction and project participants’ satisfaction have been identified as one of the key factors affecting project success. With the help of mutual project evaluation, different BMs enable organizations to monitor their performance and to improve their operations in various areas. They also make it possible to position an organization’s performance in comparison to the competitors and help to perceive black spots in the process on project level. As a common system for the parties in the industry, the project evaluation BM system promotes quality improvement, customer orientation and collaboration between participants. Social implications Project evaluation between the project participants’ enhance collaboration and mutual learning. Originality/value Multi-company project evaluation is a new and promising topic in performance measurement which holds potential for performance improvement through the utilization of network information and team dynamics. The study presents its wider utility as the basis of national, company and project BM.

Accessibility Evaluation in Aircraft Cabin Based on Virtual Reality

2014 ◽  
Vol 651-653 ◽  
pp. 1511-1514 ◽  
Author(s):  
Xian Li ◽  
Hu Liu
Keyword(s):  
Virtual Reality ◽  
Virtual Environment ◽  
Evaluation System ◽  
Tracking System ◽  
Rapid Development ◽  
New Method ◽  
Air Transport ◽  
Aircraft Cabin ◽  
Air Transport Industry ◽  
Accessibility Evaluation

With the rapid development of the air transport industry, more attention is paid to interior ergonomics analysis which directly affects the time and cost spent during design. To provide a quick and human-in-loop accessibility way to evaluate accessibility in aircraft cabin, a new method based on virtual reality is proposed. In this method, the digital mock-up model is converted to other format which is need to build a virtual environment first, then virtual environment is built and a virtual hand is driven through tracking hand’s position by A.R.T(Advanced Realtime Tracking ) system to carry on accessibility evaluation in the virtual environment. Based on above-mentioned method the aircraft cabin accessibility evaluation system is designed and realized, which is verified by one case of a certain aircraft cabin. The result shows this method is simple and useful, offering a new way for accessibility evaluation in aircraft cabin.

MAINTAINABILITY ANALYSIS AND EVALUATION OF FLEXIBLE CABLES BASED ON DELMIA

2016 ◽  
Vol 40 (5) ◽  
pp. 995-1005 ◽  
Author(s):  
Meixia Tu ◽  
Lv Chuan ◽  
Meihui Wang ◽  
Dong Zhou ◽  
Yiliu Xu ◽  
...  
Keyword(s):  
Evaluation System ◽  
Evaluation Method ◽  
Evaluation Criteria ◽  
Analysis And Evaluation ◽  
Complex Products ◽  
Integrated Platform ◽  
Maintainability Analysis ◽  
Flexible Cables ◽  
Virtual Maintenance

This paper presents a virtual maintenance application for the maintainability analysis and evaluation of flexible cables to provide recommendations on the maintainability of products containing cables during the early stages of product design. This paper provides a methodology for complex products containing cables detecting the potential defects via virtual maintenance technology. An integrated platform for analyzing and evaluating cable maintenance in a virtual environment is designed. Then, based on the maintenance simulation platform DELMIA, a cable maintainability evaluation system is proposed. The system consists of an evaluation element, a evaluation criteria, and an evaluation method. A case study on aviation aircraft subsystem disassembly was used to validate the feasibility of virtual maintenance in improving cable maintainability designs.

The Method of Equipment Maintenance Accessibility Evaluation Based on Index Correlation Degree

2013 ◽  
Vol 401-403 ◽  
pp. 500-503
Author(s):  
Da Xu ◽  
Bao Qi Wang ◽  
Chuang Li ◽  
Xi Wu
Keyword(s):  
Virtual Environment ◽  
Evaluation Method ◽  
Equipment Maintenance ◽  
Correlation Degree ◽  
Accessibility Evaluation

Aiming at the disadvantage of existing equipment maintenance accessibility evaluation method, this paper studied the project of equipment maintenance accessibility evaluation. a method of equipment maintenance accessibility evaluation in the virtual environment is put forward based on Matrices Permanent and index correlation degree , at last an example is given. It is significant for developing maintainability verification and increasing Equipment Maintainability in the course of equipment digital mock-up designing.

scholarly journals Method of Desulfurization Process Selection Based on Improved Fuzzy Comprehensive Evaluation: A Case Study of Papermaking Desulfurization in China

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 446 ◽  
Author(s):  
Wang ◽  
Wang ◽  
Zhu ◽  
Gong
Keyword(s):  
Evaluation System ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Process Selection ◽  
Evaluation Tool ◽  
Comprehensive Evaluation Method ◽  
Implementation Processes ◽  
Desulfurization Process

With the increasingly prominent global energy and environmental problems, more and more enterprises have been required to desulfurize the exhausted gases. Different enterprises have different demands for the desulfurization process, thus the choice of desulfurization process methods has become a focus of attention. Since the evaluation of the desulfurization process involves many factors, this paper proposes an improved fuzzy comprehensive evaluation method to evaluate the selection of desulfurization process when the traditional evaluation method is not applicable. Firstly, an evaluation system with two rating indicators was constructed, which considers the subjective and objective weights comprehensively. Secondly using the two hierarchical indicators, an effective desulfurization process method was obtained according to the principle of maximum membership degree. Finally, we took a real papermaking factory as an example to illustrate the detailed implementation processes of this method. The result shows that the model could be used as a comprehensive evaluation tool to select desulfurization scheme or optimize the desulfurization process.

scholarly journals Task space adaptation via the learning of gait controllers of magnetic soft millirobots

2021 ◽  
pp. 027836492110218
Author(s):  
Sinan O. Demir ◽  
Utku Culha ◽  
Alp C. Karacakol ◽  
Abdon Pena-Francesch ◽  
Sebastian Trimpe ◽  
...  
Keyword(s):  
Human Body ◽  
Degrees Of Freedom ◽  
Bayesian Optimization ◽  
Small Scale ◽  
Soft Robots ◽  
Modeling And Control ◽  
Walking Gait ◽  
Physical Experiments ◽  
Efficient Learning ◽  
Task Environments

Untethered small-scale soft robots have promising applications in minimally invasive surgery, targeted drug delivery, and bioengineering applications as they can directly and non-invasively access confined and hard-to-reach spaces in the human body. For such potential biomedical applications, the adaptivity of the robot control is essential to ensure the continuity of the operations, as task environment conditions show dynamic variations that can alter the robot’s motion and task performance. The applicability of the conventional modeling and control methods is further limited for soft robots at the small-scale owing to their kinematics with virtually infinite degrees of freedom, inherent stochastic variability during fabrication, and changing dynamics during real-world interactions. To address the controller adaptation challenge to dynamically changing task environments, we propose using a probabilistic learning approach for a millimeter-scale magnetic walking soft robot using Bayesian optimization (BO) and Gaussian processes (GPs). Our approach provides a data-efficient learning scheme by finding the gait controller parameters while optimizing the stride length of the walking soft millirobot using a small number of physical experiments. To demonstrate the controller adaptation, we test the walking gait of the robot in task environments with different surface adhesion and roughness, and medium viscosity, which aims to represent the possible conditions for future robotic tasks inside the human body. We further utilize the transfer of the learned GP parameters among different task spaces and robots and compare their efficacy on the improvement of data-efficient controller learning.

Research in Geological Environmental Evaluation System of Transmission Line

2014 ◽  
Vol 641-642 ◽  
pp. 1238-1245
Author(s):  
Zi Xia Feng ◽  
Bin Bin Zhao ◽  
Lei He ◽  
Chen Fang
Keyword(s):  
Transmission Lines ◽  
Evaluation System ◽  
Evaluation Method ◽  
Rapid Development ◽  
Evaluation Research ◽  
Planning Period ◽  
Environmental Evaluation ◽  
Life Cycle Design ◽  
Power Construction ◽  
Whole Life Cycle

With the rapid development of electric power construction , transmission lines and the surrounding geological environment influence each other that has become increasingly serious, however, there is not formed yet a set of complete and more scientific geological environmental evaluation system in transmission lines at present. In this paper, on the basis of using the experience of other industries of geological environmental evaluation research , study and put forward the geological environmental evaluation method specifically for transmission lines. Evaluation system is established for transmission lines in planning period and construction period , and also put forward the corresponding evaluation index. The research conclusion can provides theoretical support and maintenance for transmission lines of the whole life cycle design,and it also provides reference in designing transmission lines plan and preventing, and controlling geological environmental problems of transmission lines for the decision-making department.

In-training Examinations as Predictors of Resident Clinical Performance

PEDIATRICS ◽  
1989 ◽  
Vol 84 (1) ◽  
pp. 165-172
Author(s):  
Thomas G. Quattlebaum ◽  
Paul M. Darden ◽  
John B. Sperry
Keyword(s):  
Cognitive Skills ◽  
Evaluation System ◽  
Formative Evaluation ◽  
Professional Competence ◽  
Clinical Performance ◽  
Evaluation Tool ◽  
Patient Centered ◽  
Critical Skills ◽  
Level Of Training ◽  
Highly Correlated

Previous attempts to predict resident clinical performance based solely on measures of cognitive skills have been uniformly unsuccessful. For the past 8 years, a formative residency evaluation system has been used that includes yearly comprehensive oral in-training examinations (OITEs) assessing each resident's performance in the three areas of professional competence: cognitive, psychomotor, and affective. The results of these examinations and scores received on the written in-training examination (WITE) given by the American Board of Pediatrics were compared with faculty ratings received during the subsequent year of residency. No significant correlation was found at any level of training between WITE scores and clinical performance. Analysis based on clinical setting did not improve these results. Oral intraining examination scores, however, were highly correlated with clinical performance ratings. In addition, with oral in-training examination scores, the "problem" interns—those whose clinical performance rating placed them in the lower 10% of interns—were predicted with a high degree of significance, sensitivity, and specificity. Predictions based on WITEs were not significant. Simultaneous evaluation of all three areas of professional competence should be done when predictions of resident performance are attempted. The OITE is a powerful formative evaluation tool, providing valuable learning experiences as residents are objectively assessed while they perform patient-centered tasks that represent critical skills in the practice of medicine. It allows early detection and possible amelioration of future problems in the clinical performance of a resident.

Study of highway asphalt pavement recycling maintenance scheme decision system and decision method

2021 ◽  
pp. 1-10
Author(s):  
Hongjun Jing ◽  
Ping Yao ◽  
Lichen Song ◽  
Jiahao Zhang ◽  
Yanlong Zhao ◽  
...  
Keyword(s):  
Decision Making ◽  
Evaluation System ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Asphalt Pavement ◽  
Economic Benefits ◽  
Highway Maintenance ◽  
Decision System ◽  
Recovery Index ◽  
Pavement Recycling

With modern economic and social development, the technical and economic requirements of highway maintenance and construction projects have become increasingly complicated. Meticulous and in-depth investigation and demonstration guided by scientific theories and methods are of considerable importance to highway maintenance scheme decision. As basis for the selection of highway asphalt pavement recycling maintenance scheme, the factors influencing the decision are analytically demonstrated and an evaluation system is proposed, including three major decision indexes: applicability of recycling mode, recycled pavement quality recovery index, and economic benefit. According to the principles of data statistics and analysis, this study proposes a calculation method for the recycled pavement quality recovery index, analyzes the economic benefits of decision schemes using economic models such as recycling ratio and cost, and puts forward an optimal evaluation method of engineering cost and its fuzzy score intervals. Index weights are calculated through the analytic hierarchy process, and the comprehensive decision evaluation system and comprehensive evaluation method are established. Subsequently, the decision-making method is analyzed on the basis of the decision system by combining the related data. Results show maximum weight of the pavement quality recovery index and minor differences among four recycling schemes in the quality recovery index and applicability. The decision-making results are simplified with clear hierarchical feature because of the fuzzy score intervals of each index. Findings can provide a reference for the asphalt pavement recycling scheme decision.

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