scholarly journals Board 93: MAKER: Improving the Quality of Mechanical Engineering Senior Capstone Designs by Incorporating Geometric Dimensioning and Tolerancing During the Concept Design Phase

2020 ◽  
Author(s):  
Tomas Oppenheim
Keyword(s):  
Mechanical Engineering ◽  
Design Phase ◽  
Concept Design ◽  
Geometric Dimensioning And Tolerancing ◽  
Dimensioning And Tolerancing

Generating More Valid Designs During Design Exploration

2011 ◽  
Vol 27 (04) ◽  
pp. 153-161
Author(s):  
Ties van Bruinessen ◽  
Hans Hopman ◽  
Thomas DeNucci ◽  
Bart van Oers
Keyword(s):  
Coast Guard ◽  
Design Phase ◽  
Concept Design ◽  
Customer Requirements ◽  
Design Exploration ◽  
Improve Design ◽  
Conceptual Design Phase ◽  
Concept Exploration ◽  
The U.S

Concept Exploration Models (CEM) are powerful tools in the conceptual design phase, triggering naval architects towards unconventional or better solutions. However, the quality of the design-set depends on the evaluation of each concept design and its compliance to customer requirements. To improve design-set quality new evaluation-modules are developed to calculate sea-keeping, weight, and resistance and evaluate their compliance with requirements set by the U.S. Coast Guard. To make this possible the MATLAB based CEM was coupled with the sea-keeping program Shipmo2000 from the Marin Research Institute. In a final step the designs were graphically filtered and evaluated.

Parametric-Based Determination of Cylindrical Variations in Geometric Tolerancing

1999 ◽  
Vol 122 (3) ◽  
pp. 549-555 ◽  
Author(s):  
C. Carolina Ba´rcenas ◽  
Paul M. Griffin
Keyword(s):  
Geometric Dimensioning And Tolerancing ◽  
Geometric Tolerancing ◽  
Dimensioning And Tolerancing ◽  
Surface Variation ◽  
Cylindrical Parts ◽  
Different Parts

The ANSI Y14.5M Geometric Dimensioning and Tolerancing Standards have been used for many years by practitioners for size and form verification of manufactured parts. However, different parts may satisfy these tolerances and yet perform quite differently because of surface variations not specified in the standards. We present a statistically-based technique for the determination of the type of surface variation for cylindrical parts. This technique is based on a parametric-based part representation used for fitting. The method is illustrated with examples. [S1087-1357(00)00403-2]

Integrated Quality Index of Organizational and Technological Solutions for Implementation of Burundian Capital Master Plan

2018 ◽  
Vol 931 ◽  
pp. 1295-1300
Author(s):  
Azariy A. Lapidus ◽  
Ndayiragije Yves
Keyword(s):  
Life Cycle ◽  
Quality Index ◽  
Construction Project ◽  
Phase Changes ◽  
Integral Model ◽  
Master Plan ◽  
Design Phase ◽  
Planning And Design

Construction project involves a complex array of specific interdependent activities, undertaken by multiple participants with contradictions of interests. It has phases to follow in its life cycle to meet the project’s objectives. Each phase will typically have multiple sub-phases and processes. The choice of technological and organizational solutions is carried out in the planning and design phase. Changes affecting any task (or the need to resolve conflicting elements of two or more tasks) can have a significant knock-on effect on the project’s success, regardless of the phase of the life cycle. This paper intends to develop an integral model of organizational and technological solutions, which allows to choose the optimal criteria for Burundian capital master plan as well as monitoring the quality of their implementation.

scholarly journals Thoracoscopic Ablation with Appendage Ligation versus Medical Therapy for Stroke Prevention a Proof-of-Concept Randomized Trial

2016 ◽  
Vol 11 (2) ◽  
pp. 99-105 ◽  
Author(s):  
Thomas M. Beaver ◽  
Vishnumurthy Shushrutha Hedna ◽  
Anna Y. Khanna ◽  
William M. Miles ◽  
Catherine C. Price ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Medical Management ◽  
Stroke Prevention ◽  
Normal Sinus Rhythm ◽  
Recurrent Stroke ◽  
Outcome Variable ◽  
Concept Design ◽  
Proof Of Concept ◽  
Surgical Morbidity

Objective Atrial fibrillation (AF) has a demonstrable effect on quality of life (QOL). Recurrent stroke occurs in 10% of patients with AF. The objective of this study was to demonstrate proof of concept that thoracoscopic pulmonary vein isolation and atrial appendage ligation (TPVIAL) could prevent recurrent stroke and could potentially improve QOL in patients with AF with a previous stroke. Methods The study was a National Institutes of Health-funded single-center proof-of-concept design that randomized 23 patients with AF-related stroke to TPVIAL (n = 12) or to medical management (n = 11). Quality of life was the primary outcome variable; secondary end points included restoration of rhythm, recurrent stroke, and surgical morbidity. Results Quality-of-life subscores at 3 and 6 months revealed improvements in energy and decreases in fatigue in the TPVIAL arm [baseline, 33 (19.8); 3 months, 49.5 (20.6), P = 0.01; 6 months, 55.5 (14.4), P = 0.03]. At 12-month follow-up, there were no recurrent strokes in the TPVIAL group. In the medically treated arm, two patients at 6 months (P = 0.22) and three total patients at 12 months (P = 0.09) had recurrent ischemic stroke. There was one death in the medical management arm. In the TPVIAL arm, no AF recurrence occurred in patients with paroxysmal AF, and one patient had recurrence of persistent and long-standing AF. Seven patients in the TPVIAL arm discontinued warfarin therapy for secondary stroke prevention. Conclusions This small proof-of-concept study showed that TPVIAL improved QOL on two subscores and restored normal sinus rhythm in all but one patient, and it showed the potential to prevent secondary stroke. A larger study will be needed.

scholarly journals A Concept Design of an Adaptive Tendon Driven Mechanism for Active Soft Hand Orthosis

Proceedings ◽  
2020 ◽  
Vol 64 (1) ◽  
pp. 21
Author(s):  
Bruno Lourenço ◽  
Vitorino Neto ◽  
Rafhael de Andrade
Keyword(s):  
Degrees Of Freedom ◽  
Low Cost ◽  
Vital Role ◽  
Dorsal Side ◽  
Concept Design ◽  
Cord Injury ◽  
3D Printed ◽  
Biomechanical Constraints ◽  
Active Orthosis

The Hands exert a vital role in the simplest to most complex daily tasks. Losing the ability to make hand movements, which is usually caused by spinal cord injury or stroke, dramatically impacts the quality of life. In order to counteract this problem, several assisting devices have been proposed, but they still present several usage limitations. The marketable orthoses are generally either the static type or over-expensive active orthosis that cannot perform the same degrees of freedom (DoF) that a hand can do. This paper presents a conceptual design of a tendon-driven mechanism for hand’s active orthosis. This study is a part of an effort to develop an effective and low-cost hand’s orthosis for people with hand paralysis. The tendon design proposed was thought to comply with some requisitions such as lightness and low volume, as well as fit with the biomechanical constraints of the hand joints to enable a comfortable use. The mechanism employs small cursors on the phalanges to allow the tendons to run on the dorsal side and by both sides of the fingers, allowing 2 DoF for each finger, and one extra tendon enlarges the hands’ adduction nuances. With this configuration, it is simple enough to execute the flexion and extension movements, which are the most used movements in daily actives, using one single DC actuator for one DoF to reduce manufacturing costs, or with more DC actuators to enable more natural hand coordination. This system of actuation is suitable to create soft exoskeletons for hands easily embedded into 3D printed parts, which could be merged over statics thermoplastic orthosis. The final orthosis design allows dexterous finger movements and force to grasp objects and perform tasks comfortably.

scholarly journals Rancang Bangun Media Pembelajaran Avionic - Radio Theory II Berbasis Multimedia Animasi pada ATKP Medan

2020 ◽  
Vol 1 (3) ◽  
pp. 247
Author(s):  
Dwiyanto Dwiyanto ◽  
Catra Indra ◽  
Ahmad Faisal ◽  
Iswandi Idris ◽  
Rizaldy Khair
Keyword(s):  
Life Cycle ◽  
Learning Process ◽  
Limited Resources ◽  
Concept Design ◽  
Development Life Cycle ◽  
Multimedia Development ◽  
Quality Of Learning

The importance of Learning Media is used by ATKP Medan to continuously improve the quality of learning. The problem that is often encountered in avionic learning is the limited resources available because to access avionic learning the cadets must access from the CBT LAB and cannot be from elsewhere. This is because Avionic software is only installed inside the lab and cannot be learned from outside the lab. The purpose of this research is to improve the digital avionic-Radio Theory II learning process which is packaged in multimedia animation to make it easier for cadets to learn avionic Radio Theory II without having to access it in the laboratory. The method used in this research is to use the MDLC Multimedia Development Life Cycle method, namely the Concept concept, design, material collection, assembly, testing, distribution, distribution, The resulting output is an animated video product and publication to the ISSN journal

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