Applications of Kinematic/Kinetic Performance Tools in Synthesis of Multi-DOF Mechanisms

1994 ◽  
Vol 116 (2) ◽  
pp. 452-461 ◽  
Author(s):  
Ming-Yih Lee ◽  
A. G. Erdman ◽  
Y. Gutman
Keyword(s):  
Efficiency Index ◽  
Inner Product ◽  
Performance Indices ◽  
Kinematic Coupling ◽  
Evaluation Of Performance ◽  
Coupling Index ◽  
Closed Chain ◽  
Effectiveness And Efficiency ◽  
Index Ratio ◽  
Joint Range

Analytical and graphical performance synthesis tools for multi-DOF mechanisms are developed in the companion of this two-part paper [1]. Various performance indices derived from the Jacobian matrix for analyzing performance characteristics of multi-DOF mechanisms were proposed. These performance indices are the local kinematic coupling index (inner product of the Jacobian column vectors), the local directional mobility index (ratio of the Jacobian’s eigenvalues), and the local efficiency index (product of the Jacobian’s eigenvalues). In this paper, effort is placed on the applicability of the proposed analytical and graphical synthesis tools used to aid the design of multi-DOF mechanisms. Two examples representing open and closed chain mechanisms will be used to illustrate the effectiveness and efficiency of the proposed method. First, a two-link planar robotic manipulator is used to apply the proposed method. Following that, a two DOF parallel drive road simulator illustrates applicability of the suggested tools. Through these examples, geometric parameters and joint range limits of the mechanism are optimized through the evaluation of performance indices, eigen-ellipse and intersection angle between trajectory contours.

Applications of Kinematic/Kinetic Performance Tools in Synthesis of Multi-D.O.F. Mechanisms

1991 ◽  
Author(s):  
Ming-Yih Lee ◽  
Arthur G. Erdman ◽  
Yevsey Gutman
Keyword(s):  
Efficiency Index ◽  
Inner Product ◽  
Performance Indices ◽  
Kinematic Coupling ◽  
Evaluation Of Performance ◽  
Coupling Index ◽  
Closed Chain ◽  
Effectiveness And Efficiency ◽  
Index Ratio ◽  
Joint Range

Abstract Analytical and graphical performance synthesis tools for multi-DOF mechanisms are developed in the companion of this two-part paper [1]. Various performance indices derived from the Jacobian matrix for analyzing performance characteristics of multi-DOF mechanisms were proposed. These performance indices are the local kinematic coupling index (inner product of the Jacobian column vectors), the local directional mobility index (ratio of the Jacobian’s eigenvalues), and the local efficiency index (product of the Jacobian’s eigenvalues). In this paper, effort is placed on the applicability of the proposed analytical and graphical synthesis tools used to aid the design of multi-DOF mechanisms. Two examples representing open and closed chain mechanisms will be used to illustrate the effectiveness and efficiency of proposed method. First, a two-link planar robotic manipulator is used to apply the the proposed method. Following that, a two DOF parallel drive road simulator illustrates applicability of the suggested tools. Through these examples, geometric parameters and joint range limits of the mechanism are optimized through the evaluation of performance indices, eigen-ellipse and intersection angle between trajectory contours.

Development of Kinematic/Kinetic Performance Tools in Synthesis of Multi-DOF Mechanisms

1993 ◽  
Vol 115 (3) ◽  
pp. 462-471 ◽  
Author(s):  
Ming-Yih Lee ◽  
A. G. Erdman ◽  
Y. Gutman
Keyword(s):  
Computer Aided Design ◽  
Graphical Representation ◽  
Jacobian Matrix ◽  
Efficiency Index ◽  
Performance Characteristics ◽  
Design Stage ◽  
Performance Indices ◽  
Coupling Index ◽  
Index Ratio ◽  
Aided Design

Kinematic and kinetic performance are important issues in designing multi-degree-of-freedom mechanisms such as robotic manipulators. In the engineering design stage, it is especially important that the designer can grasp the characteristics of the mechanism. The aim of this study is to develop a means of representing the kinematic and kinetic performance of the mechanism in such a way that the performance characteristics are quantified analytically and visible graphically to the designer in their entirety at the conceptual design stage. Various performance indices are derived from the Jacobian matrix and its quadratic form. These performance indices are the local kinematic cross-coupling index (angle of intersection between column vectors of the Jacobian), the local directional mobility index (ratio of Jacobian’s eigenvalues), and the local efficiency index (product of Jacobian’s eigenvalues). Graphical images of these performance characteristics using eigen-ellipsoid and workspace trajectory contours are introduced. Critical performance points in mechanism workspace are identified and elaborated for design considerations. Based on the graphical representation of these performance characteristics, design rules for achieving different performance objectives can easily be implemented. This method is applicable to computer-aided design of a mechanism and predetermination of its kinematic and kinetic performance.

Development of Kinematic/Kinetic Performance Tools in Synthesis of Multi-D.O.F. Mechanisms

1991 ◽  
Author(s):  
Ming-Yih Lee ◽  
Arthur G. Erdman ◽  
Yevsey Gutman
Keyword(s):  
Computer Aided Design ◽  
Graphical Representation ◽  
Jacobian Matrix ◽  
Robotic Manipulators ◽  
Efficiency Index ◽  
Performance Characteristics ◽  
Design Stage ◽  
Performance Indices ◽  
Coupling Index ◽  
Aided Design

Abstract Kinematic and kinetic performance are important issues in designing multi-degree of freedom mechanisms such as robotic manipulators. In the engineering design stage, it is especially important that the designer can grasp the characteristics of the mechanism. The aim of this study is to develop a means of representing the kinematic and kinetic performance of the mechanism in such a way that the performance characteristics are quantified analytically and visible graphically to the designer in their entirety in the conceptual design stage. Various performance indices derived from the Jacobian matrix and its quadratic form. These performance indices are the local kinematic cross-coupling index, the local directional mobility index, and the local efficiency index. Graphical images of these performance characteristics using eigen-ellipsoid and workspace trajectory contours are introduced. Critical performance points in mechanism workspace are identified and elaborated for design considerations. Based on the graphical representation of these performance characteristics, design rules for achieving different performance objectives can easily be implemented. This method is applicable to computer-aided design of a mechanism and predetermination of its kinematic and kinetic performance.

Performance Assessment in Team Sports

1997 ◽  
Vol 16 (4) ◽  
pp. 500-516 ◽  
Author(s):  
Jean-Francis Gréhaigne ◽  
Paul Godbout ◽  
Daniel Bouthier
Keyword(s):  
Ecological Validity ◽  
Interobserver Reliability ◽  
Team Sports ◽  
Authentic Assessment ◽  
Efficiency Index ◽  
Individual Performance ◽  
Assessment Procedure ◽  
Performance Indices ◽  
The Stability ◽  
Teaching Learning

The purpose of this paper is to discuss a procedure to assess individual performance in team sports in contexts of preassessment and formative assessment. An authentic assessment procedure based on the observation of players’ actions during matches yielded two performance indices: the efficiency index and the volume of play. A general nomogram is suggested for use with various team sports in order to produce a single performance score combining both indices. Content validity, concurrent validity (.74), and ecological validity are discussed. The interobserver reliability (>.90) of the data and the stability of performance (.88) are also examined. Some conditions are discussed for integrating the assessment procedure to the teaching-learning process with an active participation of the students in the collection and interpretation of the data. The proposed procedure is strictly game oriented and yields information reflecting both motor and tactical skills.

scholarly journals Designing Persuasive Application to Promote Public Transportation Use

2021 ◽  
Vol 20 (1) ◽  
pp. 22
Author(s):  
Thedy Yogasara ◽  
Vania Edra Christabel Naomi
Keyword(s):  
Public Transportation ◽  
Interaction Design ◽  
Qualitative Method ◽  
Evaluation Process ◽  
Threshold Value ◽  
Fossil Fuel Combustion ◽  
Scoring Method ◽  
Evaluation Of Performance ◽  
Effectiveness And Efficiency

The poor air quality of Jakarta, caused among others by fossil fuel combustion for transportation, harmfully affects the health of its people. Carbon emissions resulting from transportation activities can be reduced by getting people to use public transportation more frequently. This research aims at designing a persuasive application to encourage people to use public transportation more often. The steps of interaction design were employed. Firstly, user needs were identified using interviews, resulting in 48 interpreted needs which were then grouped into nine primary needs. Secondly, a design workshop involving users and designers was conducted to produce three concept alternatives. In the next stage, the best concept was selected using the concept scoring method and was subsequently refined through the SCAMPER method. A high-fidelity prototype was developed based on the final concept. Lastly, the evaluation process of the application prototype named ecoGlide consisted of two major parts, i.e. the evaluation of performance and persuasive qualities. The performance evaluation was conducted through Usability Testing using five criteria. The effectiveness and efficiency criteria consecutively score 91% and 71.43%, exceeding the minimum acceptable value of 70%. Furthermore, the satisfaction, usefulness, and learnability criteria respectively score 3.83, 3.88, and 3.88, which surpass the threshold value of 3.4. The persuasive quality was evaluated using the qualitative method through a coding scheme. The result shows that the Emotion and Persuasion categories were most closely related to the application use. The most influential sub-category of the persuasion aspect is Reward Driven, which ranks 4th out of 14 sub-categories. Overall, the ecoGlide application was considered to have good usability and persuasive ability.

Knee Kinematic Coupling in Males and Females: Open and Closed-Chain Tasks

2012 ◽  
Vol 28 (3) ◽  
pp. 291-296 ◽  
Author(s):  
Rebecca Avrin Zifchock ◽  
Kristamarie Pratt ◽  
Allison Brown ◽  
Howard Hillstrom
Keyword(s):  
Stance Phase ◽  
Intraclass Correlation ◽  
Knee Kinematic ◽  
Full Extension ◽  
Vector Coding ◽  
Kinematic Coupling ◽  
Secondary Purpose ◽  
Closed Chain ◽  
Main Effect ◽  
Males And Females

The purpose of this study was to compare the magnitude of knee kinematic coupling between genders and among open- and closed-chain tasks. A secondary purpose was to compare the consistency of knee kinematic coupling between genders and among open- and closed-chain tasks. Vector-coding methods were used to quantify coupling in the sagittal and transverse planes of the knee between full extension and 20 degrees of flexion as 10 males and 10 females walked, ascended and descended stairs, and performed a passive pendulum leg drop. An ANOVA showed no main effect of gender. There was a main effect of task, where coupling during the stance phase of walking was significantly greater than each of the other tasks. Intraclass correlation values suggested that males were slightly more consistent than females. A general lack of divergence between genders may be related to the tasks analyzed in this study. It is possible that more strenuous tasks may elicit larger differences.

scholarly journals Evaluation of Performance Employee (Study on Faculty of Educational Science Manado State University-Indonesia )

2018 ◽  
Vol 6 (07) ◽  
Author(s):  
Roos M.S Tuerah
Keyword(s):  
Human Resources ◽  
Performance Appraisal ◽  
Administrative Staff ◽  
State University ◽  
Government Regulations ◽  
Performance Achievement ◽  
Evaluation Of Performance ◽  
Main Factors ◽  
Effectiveness And Efficiency ◽  
Faculty Of Education

The main problem in this study related to Human Resources (HR) which is one of the main factors in improving the productivity of performance in the organization or agency. Therefore, it is necessary to have competent human resources that can support the improvement of performance achievement. The study aims to determine the performance of administrative staff at the science faculty of the Manado State University, Indonesia. By using a qualitative approach, respondents are taking data of all employees in the faculty of education, which amounted to 35 people. The conclusion shows that the performance of Employees in the faculty of education, Manado State University is influenced by the factors: Effectiveness and efficiency, Authority (authority), discipline, initiative. Performance appraisal of employees follows the applicable government regulations. It takes a sense of responsibility from all employees in carrying out their duties.

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