Automatic Selection of Mechanism Designs from a Three-Dimensional Design Map

1992 ◽  
Vol 114 (3) ◽  
pp. 359-367 ◽  
Author(s):  
S. Kota
Keyword(s):  
Selection Process ◽  
Three Dimensional ◽  
Quantitative Comparison ◽  
Linkage Mechanism ◽  
Computer Aided ◽  
Definite Pattern ◽  
Design Selection ◽  
Four Bar Linkage ◽  
Synthesis Approach ◽  
Selection Of

Often a simple (four-bar linkage) mechanism to trace a desired path is sought. Dimensions of linkages to trace a specified coupler curve exactly are difficult to determine. Precision point techniques do not guarantee that the desired path will be generated. The methodology presented in this paper is based on indirect synthesis approach to select four-bar linkages that trace a given desired path. A practical, computer-aided three-dimensional design chart for the selection of four-bar linkage candidate designs that trace symmetrical paths is presented. It is based on hypothesis that any arbitrary path can be approximated by a symmetrical path at least for the purpose of choosing an initial design. Four-bar linkages that generate symmetrical paths are easier to design and exhibit a definite pattern of changes in their shape as the linkage parameters are varied. General design categories and the corresponding solution subspaces in the 3-D design map are identified to aid in the selection of candidate designs. The automation of the design-selection process requires a satisfactory means to quantitatively compare the “desired” and the “known” coupler curves. This paper addresses the issues involved in quantitative comparison of two arbitrary curves using parameterization and shape evaluation. A design example of automated selection of mechanism designs is also presented.

Automatic Selection of Four-Bar Linkage Designs for Path Generation Task

1988 ◽  
Author(s):  
S. Kota ◽  
R. B. Gudapati
Keyword(s):  
Design Methodology ◽  
Selection Process ◽  
Generation Task ◽  
Design Charts ◽  
Definite Pattern ◽  
Design Selection ◽  
Four Bar Linkage ◽  
Synthesis Approach ◽  
Initial Selection ◽  
Selection Of

Abstract Often a simple mechanism to trace a desired path is sought. Coupler curves of linkages are generally difficult to determine, especially in the case that a certain shape or a type of curve is required for a particular application. Precision point techniques do not guarantee that the desired path will be generated. The design methodology presented in this paper is an indirect synthesis approach to design four-bar linkages that trace (approximately) a given desired path. Simple and yet extremely useful design charts for the initial selection of four-bar linkage candidate designs are presented in this paper. This is based on our philosophy that an arbitrary path (desired) can be viewed as an approximation to a known symmetrical path. Four-bar linkages that generate symmetrical paths are easier to design and exhibit a definite pattern of changes in their shape as the linkage parameters are varied. The first step in automating the design-selection process requires a satisfactory means to quantitatively compare the desired with the known (symmetrical) coupler curves. This paper addresses various issues involved in the comparison of two arbitrary curves. Based on curve parametrization, an effective algorithm for quantitative shape evaluation of arbitrary curves is developed. Finally, the design charts and design examples are presented.

scholarly journals 3D polymeric scaffolds for oral tissue regeneration

2019 ◽  
Vol 37 (3) ◽  
pp. 28
Author(s):  
Daniel Chavarría-Bolaños ◽  
Diana Villalobos ◽  
José Roberto Vega-Baudrit
Keyword(s):  
Tissue Regeneration ◽  
Clinical Performance ◽  
Correct Diagnosis ◽  
Three Dimensional ◽  
Biological Response ◽  
Active Role ◽  
Innovative Idea ◽  
Design Selection ◽  
Selection Of ◽  
The Ideal

A fundamental base of bioengineering and tissue regeneration is the selection and development of the scaffolds responsible for cell growth. However, finding the “ideal” scaffold depends not only on proposing an innovative idea, but also on considering multiple chemical, biological, and physical aspects that can be manipulated to optimize their future clinical performance. Multiple local variables (such as local inflammation, vascularity, tissue damage, immune response, among others), as well as systemic variables (diseases or concomitant treatments) can favor or affect the scaffold behavior in each case. The selection of the ideal scaffold for each case involves three indispensable steps: design, selection of manufacturing material, and visualization of the future biological function that each biomaterial will perform. The design is always a parallel process with the selection of the ideal biomaterial. Certain “light” scaffolds (such as membranes, hydrogels, or sponges) will require the use of polymers that allow their simple manipulation and early degradation, which in turn can favor the release of charged molecules previously included, obtaining an active scaffold known as drug delivery system. On the other hand, structural scaffolds that are prone to replace block compromised structures may need different designs and production techniques, where three-dimensional printing is included. All of these options should consider important aspects such as bioactivity, regenerative capacity, and biological response of the surrounding tissues. Some alternatives may induce greater cell adhesion and proliferation, while optimizing the osseointegration and healing processes. Other alternatives may play a more “active” role while promoting regeneration processes and controlling local infectious diseases or painful responses. In order to look for the best translational approach of the biomaterial, each option must be chosen with the correct diagnosis of the case to be treated.

scholarly journals Prototyp simulátora letového environmentálneho laboratória Evirolab

AEROjournal ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 19-23
Author(s):  
Michal Janovec ◽  
◽  
Matúš Materna ◽  
Pavol Pecho ◽  
Branislav Kandera ◽  
...  
Keyword(s):  
Building Materials ◽  
Three Dimensional ◽  
Computer Software ◽  
Flight Simulator ◽  
Aircraft Control ◽  
Suitable Material ◽  
Computer Equipment ◽  
Computer Aided ◽  
Control Surfaces ◽  
Selection Of

The aim of this paper is to create a solid structural platform for the placement of computer equipment and other computer accessories to create a flight simulator from scratch. The simulator will be designed to help pilots in training get accustomed to basic flight procedures and the behavior of aircraft control surfaces during flight. Practical part deals with the design of a simulator inspired by the airplane Zlín Z 242 L, the selection of suitable material and technology to produce this simulator and the measurement of most important dimensions required for the making process. Obtained dimensions will be used to model the structure in a three-dimensional plane with the help of computer aided software, in order to create blueprints of our simulator structure. Said blueprints will be later used to cut building materials to required length and to assemble the construction frame. Last pages are dedicated to seating all required computer software directly on the frame in the correct manner.

Computer-Aided Power Requirements

2003 ◽  
Author(s):  
Edward M. Vavrek
Keyword(s):  
Design Process ◽  
Decision Process ◽  
Selection Process ◽  
Power Requirement ◽  
Belt Drives ◽  
Computer Aided ◽  
Software Program ◽  
Machine Elements ◽  
Selection Of

The power requirement of machinery is a necessary consideration for the sizing and selection of machine elements in the design process. The decision process of designing gears, belt drives, clutches, brakes, and bearings are designed and sized based on the power requirement of the application. I have written a software program that calculates the power requirements for three different design applications. This software program simplifies and streamlines the design and selection process by allowing the student to calculate the horsepower and torque requirement.

Product Design Selection Under Uncertainty and With Competitive Advantage

2000 ◽  
Author(s):  
Hui Li ◽  
Shapour Azarm
Keyword(s):  
Product Design ◽  
Selection Process ◽  
Evaluation Model ◽  
Market Competition ◽  
Alternative Evaluation ◽  
Design Life ◽  
Design Alternative ◽  
Yearly Change ◽  
Design Selection ◽  
Selection Of

Abstract This paper presents an approach wherein product design is viewed as a selection process with two main stages: design alternative generation and design alternative evaluation. The focus of this paper is mainly on a design alternative evaluation model in that designer’s preferences, customers’ preferences, and market competition are accounted for in order to select the best possible design. In the model, uncertainties in the product design life, market size and its yearly change, cost and its yearly change, price, and discount rate are considered. Product design selection of a cordless screwdriver is used as a demonstration example. However, the emphasis in the example is on the approach, and not on the details per se.

Spherical Four-Bar Linkage Mechanism for Continuous Passive Movement Rehabilitation Treatment of the Ankle

1996 ◽  
Author(s):  
Kealy R. Ham ◽  
Arthur G. Erdman ◽  
Boyang Hong
Keyword(s):  
Traumatic Injury ◽  
Three Dimensional ◽  
Passive Movement ◽  
Two Dimensional ◽  
Linkage Mechanism ◽  
Rehabilitation Treatment ◽  
Beneficial Effects ◽  
Flexion Extension ◽  
Modeling Software ◽  
Four Bar Linkage

Abstract Continuous passive movement (CPM) is an important process in the post-operative rehabilitation treatment of the knee. The two-dimensional, flexion/extension motion provided by CPM has been shown to have beneficial effects on tendon, cartilage, and ligament health via increased blood flow to the knee and surrounding tissues. Similarly, CPM may be useful in the rehabilitation of the ankle. However, the ball and socket joint of the ankle would benefit more from a three-dimensional spherical motion instead of the traditional two-dimensional, flexion/extension motion. This study presents a four-bar linkage developed with the use of three dimensional mechanical modeling software. The linkage provides a spherical path of motion for the continuous passive movement of the ankle. This spherical CPM may ultimately be useful in the treatment of congenital musculoskeletal abnormalities, acquired joint disorders, and traumatic injury of the ankle.

Product Design Selection Under Uncertainty and With Competitive Advantage

1999 ◽  
Vol 122 (4) ◽  
pp. 411-418 ◽  
Author(s):  
H. Li ◽  
S. Azarm
Keyword(s):  
Product Design ◽  
Selection Process ◽  
Evaluation Model ◽  
Market Competition ◽  
Alternative Evaluation ◽  
Design Life ◽  
Design Alternative ◽  
Yearly Change ◽  
Design Selection ◽  
Selection Of

This paper presents an approach wherein product design is viewed as a selection process with two main stages: design alternative generation and design alternative evaluation. The focus of this paper is mainly on a design alternative evaluation model in that designer’s preferences, customers’ preferences, and market competition are accounted for in order to select the best possible design. In the model, uncertainties in the product design life, market size and its yearly change, cost and its yearly change, price, and discount rate are considered. Product design selection of a cordless screwdriver is used as a demonstration example. However, the emphasis in the example is on the approach, and not on the details per se. [S1050-0472(00)01504-X]

scholarly journals The Use of Surgical Splints in Orthognathic Surgery: A Bibliometric Study

2021 ◽  
Author(s):  
Francisco Samuel Rodrigues Carvalho ◽  
Déborah Isis de Oliveira Barbosa ◽  
Iara Furtado Torquato ◽  
André Mattos Britto de Souza ◽  
Roberta Dalcico ◽  
...  
Keyword(s):  
Orthognathic Surgery ◽  
Surgical Planning ◽  
Selection Process ◽  
Three Dimensional ◽  
Bibliometric Study ◽  
Exclusion Criteria ◽  
3D Images ◽  
Technological Advances ◽  
Technological Resource ◽  
Selection Of

Abstract Introduction Orthognathic surgeries require the use of surgical splints (SS) to stabilize the occlusion and the segments fixed with plates and screws. Technological advances in the field of computing and the possibility of generating three-dimensional (3D) images have brought different possibilities for making SS, which has generated greater predictability and customization of surgical plans. The bibliometric study can have a qualitative character through the scope of articles in a certain area of knowledge. It is a selection process that can track a topic or scientific production. Methods The present study aimed to carry out a bibliometric literature review, in order to assess the evolution of the use of SS and the different planning protocols in orthognathic surgery. The Scopus database was used, with the terms “splint” and “orthognathic surgery.” Results A total of 331 articles were found. These were exported to Rayyan for application of the inclusion and exclusion criteria and selection of articles. A total of 76 references were selected and exported to the VOSviewer application for the analysis of bibliometric data. Conclusions Orthognathic surgery was initially not associated with any computerized technological resource; however, it underwent updates between the years 2010 to 2012. These advances allowed surgical planning to become faster, cheaper, and more accurate.

Research on a Type of Program-Controlled Three-Dimensional Vibration Platform

2016 ◽  
Vol 693 ◽  
pp. 1604-1610
Author(s):  
Ying Tian ◽  
Qing Jian Liu ◽  
Lei Zhang ◽  
Song Ling Tian ◽  
Peng Lin Li
Keyword(s):  
High Speed ◽  
Mechanical Vibration ◽  
Three Dimensional ◽  
Servo Motor ◽  
Linkage Mechanism ◽  
Nc System ◽  
Light Load ◽  
Left And Right ◽  
Parametric Adjustment ◽  
Four Bar Linkage

Conventional mechanical vibration platform vibrates not only in the direction of back and forth but also in the direction of up and down. Vibrations in both directions are achieved by two mechanisms, respectively. Three-dimensional vibration cannot be realized. In this paper, the servo motor, the gear drive mechanism, and the parallel four-bar linkage mechanism are combined with the NC system. And a type of program-controlled three-dimensional vibration platform is designed. The platform can vibrate in three directions, such as the directions of up and down, left and right, back and forth. The parametric adjustment of amplitude and frequency in three directions can be realized. The vibration platform is suitable for high-speed and light-load three-dimensional vibration. Compared with the existing mechanical vibration platform, the designed vibration platform overcomes some deficiencies to realize three-dimensional vibration with variable frequency and amplitude.

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