Branching Analysis of Spherical RRRR and Spatial RCCC Mechanisms

1986 ◽  
Vol 108 (4) ◽  
pp. 481-486 ◽  
Author(s):  
Charles F. Reinholtz ◽  
George N. Sandor ◽  
Joseph Duffy
Keyword(s):  
The Other ◽  
Optimization Scheme ◽  
Design Task ◽  
Position Analysis ◽  
Branching Problem

Most mechanisms can be assembled in two or more distinct configurations for a given position of the input link. Each distinct configuration is called a branch. When the prescribed positions of a synthesized mechanism lie on more than one branch, the mechanism is said to have branching problems or to suffer from “branch defect.” Usually, branching problems will render a mechanism unsuitable for the design task because the mechanism must be moved to the other branch during the course of motion. In most cases, this would require disassembly and reassembly of the mechanism. In this paper, conditions are developed for avoiding the branching problem in the spherical RRRR and spatial RCCC mechanisms. These conditions are ideally suited for incorporation into an optimization scheme as constraints because they do not require iterative calculations or a position analysis of the mechanism.

Designing in fives

1987 ◽  
Vol 5 (2) ◽  
pp. 159-165
Author(s):  
Kathy Carter ◽  
Neil Wiseman
Keyword(s):  
The Other ◽  
Design System ◽  
Computer Assisted ◽  
Design Task ◽  
Computer Assisted Design

This paper discusses a computer-assisted design system that makes use of multiple windowing, and its implementation f or typeface design. The system assigns each of five levels in the design task to a separate window, and allows the effect of changes made at any level to be seen in the other windows. The system is designed to be acceptable to designers and to avoid inhibiting their creativity.

Position Analysis in Analytical Form of the 3-PSP Mechanism

1999 ◽  
Vol 123 (1) ◽  
pp. 51-55 ◽  
Author(s):  
Raffaele Di Gregorio ◽  
Vincenzo Parenti-Castelli
Keyword(s):  
Nonlinear Equations ◽  
Parallel Mechanism ◽  
Analytical Form ◽  
Rigid Bodies ◽  
The Other ◽  
Kinematic Chains ◽  
Position Analysis ◽  
Fixed Base ◽  
Inverse Position Analysis ◽  
Movable Platform

In this paper the direct and the inverse position analysis of a 3-dof fully-parallel mechanism, known as 3-PSP mechanism, is addressed and solved in analytical form. The 3-PSP mechanism consists of two rigid bodies, one movable (platform) and the other fixed (base), connected to each other by means of three equal serial kinematic chains (legs) of type PSP, P and S standing for prismatic and spherical pair respectively. Both the direct and the inverse position analysis of this mechanism lead to nonlinear equations that are difficult to solve. In particular, the inverse position analysis comprises different subproblems which need specific solution techniques. Finally a numerical example is reported.

scholarly journals Polynomial Solution to the Position Analysis of Two Assur Kinematic Chains With Four Loops and the Same Topology

2009 ◽  
Vol 1 (2) ◽  
Author(s):  
Júlia Borràs ◽  
Raffaele Di Gregorio
Keyword(s):  
Polynomial Solution ◽  
Large Family ◽  
The Other ◽  
End Effector ◽  
Closed Loops ◽  
Kinematic Chains ◽  
Position Analysis ◽  
One To One ◽  
Actuated Joints

The direct position analysis (DPA) of a manipulator is the computation of the end-effector poses (positions and orientations) compatible with assigned values of the actuated-joint variables. Assigning the actuated-joint variables corresponds to considering the actuated joints locked, which makes the manipulator a structure. The solutions of the DPA of a manipulator one to one correspond to the assembly modes of the structure that is generated by locking the actuated-joint variables of that manipulator. Determining the assembly modes of a structure means solving the DPA of a large family of manipulators since the same structure can be generated from different manipulators. This paper provides an algorithm that determines all the assembly modes of two structures with the same topology that are generated from two families of mechanisms: one planar and the other spherical. The topology of these structures is constituted of nine links (one quaternary link, four ternary links, and four binary links) connected through 12 revolute pairs to form four closed loops.

The Use of Analogies and the Design Brief Information: Impact on Creative Outcomes

2021 ◽  
Author(s):  
Georgios Koronis ◽  
Hernan Casakin ◽  
Arlindo Silva ◽  
Jing Wen William Siew
Keyword(s):  
Undergraduate Students ◽  
The Other ◽  
Control Group ◽  
First Year ◽  
Pedagogical Tool ◽  
Analogical Thinking ◽  
Design Task ◽  
Improve Design ◽  
Design Students ◽  
University Setting

Abstract This study is aimed at ways to assess and improve design students’ creative outcomes and assist educators in crafting design briefs for design studios. The procedure entails a controlled yet analytical experiment in a university setting intended to test the potential of using analogical thinking to enhance the Novelty and Usefulness of design solutions. The control group received a brief that contained stimuli in the form of typical examples without instructions to use analogies. A second group was provided with a brief including stimuli elicited by text representations in the form of word pairs, and instructions to use textual analogies. The last group received the same stimuli as the other groups above; however, with instructions to identify negative features before using textual analogies. One hundred and seven first-year undergraduate students took part in the study. The results demonstrated that design briefs with specific instructions to use textual-based analogies contributed to highly novel outcomes. However, when analogies were elicited by statements concerning negative issues of the design task, students were able to produce more useful outcomes. We suggest that textual-based analogies can be employed as a good in-class pedagogical tool for improving novice designers’ creative outcomes overall.

Designing the Widget

2016 ◽  
Vol 2 (1) ◽  
pp. 55-79 ◽  
Author(s):  
Lisa A. Delise ◽  
Abby L. Mello
Keyword(s):  
Organizational Behavior ◽  
Interpersonal Skills ◽  
Work Teams ◽  
Soft Skills ◽  
New Product ◽  
The Other ◽  
Design Task ◽  
Class Time ◽  
Class Period ◽  
Group Negotiation

The Widget design task is an in-class, experiential exercise that affords students the opportunity to develop interpersonal skills in group negotiation. Students engage in new product design in committees of two dyads where one dyad represents Consumer Research and the other represents Strategic Management. Task information creates different perspectives and requires committees to negotiate decisions about 10 Widget attributes. The exercise is applicable to courses focusing on negotiation, work teams, and myriad other organizational behavior topics (e.g., conflict, power, communication) where interactive activities are desirable to help students develop negotiation soft skills. The exercise is adaptable to work within a 75- or 50-minute class period, and can be enhanced using measures, inventories, or assignments completed outside of class time.

scholarly journals PERANAN SEKTOR PERTANIAN TERHADAP PEREKONOMIAN DI KABUPATEN MINAHASA SELATAN

2016 ◽  
Vol 12 (2A) ◽  
pp. 239
Author(s):  
Julio P.D. Ratag ◽  
Gene H.M. Kapantow ◽  
Caroline B.D. Pakasi
Keyword(s):  
Agricultural Sector ◽  
Secondary Data ◽  
The Other ◽  
Food Plants ◽  
Domestic Product ◽  
Location Quotient ◽  
Position Analysis ◽  
North Sulawesi ◽  
The One

The aim of this research is to known the role of agricultural sector in South Minahasa Regency. The role was measured by sector position analysis and is the agriculture subsector was the base sector or nonbase by seeing the contribution of the agricultural sectorto the farming of Gross Regional Domestic Product in South Minahasa Regency. The data that has been used in this research was the secondary data by the Central Statistic Board of North Sulawesi Province, also the Agricultural and Livestock Service of South Minahasa Regency. The result of this research shows that the agricultural sector was the biggest contributor in the forming of GDRP in South Minahasa Regency. By using location quotient (LQ) analysis, the agricultural sector was one of the base sectors in the other sectors of econonomics, while agriculture subsector which was the base subsector is the one-season horticulture plants subsector. Based on the result of Dinamic Location Quotient (DLQ) analysis, the agricultural sector was predicted still be the base sector of South Minahasa Regency for five years ahead. Furthemore, the prediction of the agricultural subsector that have the potention of becoming the base subsector in the future is food plants subsector, one-sesion horticulture plants subsector, a-year horticultural subsector etcetera, a-year plantation subsector, livestock subsector, the service of agricultural subsector and hunting, and the fisheries subsector.

scholarly journals Comparing Horizontal and Vertical Surfaces for a Collaborative Design Task

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Brianna Potvin ◽  
Colin Swindells ◽  
Melanie Tory ◽  
Margaret-Anne Storey
Keyword(s):  
Collaborative Design ◽  
Vertical Surface ◽  
The Other ◽  
Design Task ◽  
Face To Face ◽  
Group Participation ◽  
Verbal Participation

We investigate the use of different surface orientations for collaborative design tasks. Specifically, we compare horizontal and vertical surface orientations used by dyads performing a collaborative design task while standing. We investigate how the display orientation influences group participation including face-to-face contact, total discussion, and equality of physical and verbal participation among participants. Our results suggest that vertical displays better support face-to-face contact whereas side-by-side arrangements encourage more discussion. However, display orientation has little impact on equality of verbal and physical participation, and users do not consistently prefer one orientation over the other. Based on our findings, we suggest that further investigation into the differences between horizontal and vertical orientations is warranted.

scholarly journals New design of grab mechanism in plastic glove machine

2018 ◽  
Vol 169 ◽  
pp. 01014
Author(s):  
Wei-Chun Hsu ◽  
Ming-Jin Jiang ◽  
Gui-Liang Liu
Keyword(s):  
Main Part ◽  
Path Tracking ◽  
The Other ◽  
Connecting Rod ◽  
Position Analysis ◽  
Plastic Bags ◽  
New Type ◽  
Four Bar Linkage

The aim of this study is to design a new type of grab mechanism for plastic bags machine in order to tear apart the plastic gloves from the plastic bags and stack them into a pile automatically. A grab mechanism with four bar linkage is developed and the main part of the grab mechanism is the clip which will pick up the plastic gloves and drag them to the other side. After a distance of drag, the clip will drop the plastic gloves to the collecting plate. The clips are fixed on the connecting rod of the four-bar linkage and the path of the clip can be traced by the position analysis of the four bar linkage. The path of the clip can be tracked by determination of the four links’ lengths. This path tracking will be one of the advantages of this new mechanism because it provides the different drag distance to grab difference size of plastic gloves by simply adjusting the lengths of four links.

Stromatoporoids from the Famennian (Devonian) Wabamun Formation, Normandville oilfield, north–central Alberta, Canada

1988 ◽  
Vol 62 (03) ◽  
pp. 411-419 ◽  
Author(s):  
Colin W. Stearn
Keyword(s):  
Patch Reef ◽  
Abundant Species ◽  
The Other ◽  
North Central ◽  
Biotic Crisis

Stromatoporoids are the principal framebuilding organisms in the patch reef that is part of the reservoir of the Normandville field. The reef is 10 m thick and 1.5 km2in area and demonstrates that stromatoporoids retained their ability to build reefal edifices into Famennian time despite the biotic crisis at the close of Frasnian time. The fauna is dominated by labechiids but includes three non-labechiid species. The most abundant species isStylostroma sinense(Dong) butLabechia palliseriStearn is also common. Both these species are highly variable and are described in terms of multiple phases that occur in a single skeleton. The other species described areClathrostromacf.C. jukkenseYavorsky,Gerronostromasp. (a columnar species), andStromatoporasp. The fauna belongs in Famennian/Strunian assemblage 2 as defined by Stearn et al. (1988).

D. The Line Spectrum of Pulsating Variable Stars

1967 ◽  
Vol 28 ◽  
pp. 207-244
Author(s):  
R. P. Kraft
Keyword(s):  
Variable Stars ◽  
The Other ◽  
Line Spectrum ◽  
Afternoon Session ◽  
Empirical Information ◽  
Pulsating Variable Stars ◽  
Almost Continuous ◽  
Informal Approach

(Ed. note:Encouraged by the success of the more informal approach in Christy's presentation, we tried an even more extreme experiment in this session, I-D. In essence, Kraft held the floor continuously all morning, and for the hour and a half afternoon session, serving as a combined Summary-Introductory speaker and a marathon-moderator of a running discussion on the line spectrum of cepheids. There was almost continuous interruption of his presentation; and most points raised from the floor were followed through in detail, no matter how digressive to the main presentation. This approach turned out to be much too extreme. It is wearing on the speaker, and the other members of the symposium feel more like an audience and less like participants in a dissective discussion. Because Kraft presented a compendious collection of empirical information, and, based on it, an exceedingly novel series of suggestions on the cepheid problem, these defects were probably aggravated by the first and alleviated by the second. I am much indebted to Kraft for working with me on a preliminary editing, to try to delete the side-excursions and to retain coherence about the main points. As usual, however, all responsibility for defects in final editing is wholly my own.)

Sign in / Sign up

Export Citation Format

Share Document