Proof-of-Concept Design for MPP Acoustic Absorbers with Elements of Art

A micro-perforated plate or panel (MPP) is a device used to absorb sound. It consists of a thin flat plate made from several different materials with small holes and a back cavity. Several reported modifications and enhancements to the original design of the MPP acoustic absorber were modified by the holes or the back-cavity shape and sizes following the original idea. The present study attempts to artistically beautify the MPP acoustic absorbers by incorporating dotted arts into the design of MPP. The perforation for micro-perforated panels could be dotted arts with a perforation size smaller than 1 mm for enhanced acoustic absorption performance in the form of various artistic designs. Small LED lights could be placed inside the acoustic chamber to create the color lights emanating from the perforations instead of dots with different colors. Several MPP incorporated artistic designs of dotted patterns were presented and their acoustic absorption performance was analyzed using impedance tube in this paper.

Download Full-text

Prediction of acoustic absorption performance of a perforated plate with air jets

Journal of Thermal Science ◽

10.1007/s11630-017-0952-5 ◽

2017 ◽

Vol 26 (4) ◽

pp. 378-384 ◽

Cited By ~ 1

Author(s):

Hiromitsu Hamakawa ◽

Masanori Miyazaki ◽

Yuta Asai ◽

Eru Kurihara ◽

Eiichi Nishida ◽

...

Keyword(s):

Perforated Plate ◽

Acoustic Absorption ◽

Air Jets ◽

Absorption Performance

Download Full-text

TOWARDS A VERIFICATION AND VALIDATING TESTING FRAMEWORK TO DEVELOP BESPOKE MEDICAL PRODUCTS IN RESEARCH-FUNDED PROJECTS

Proceedings of the Design Society ◽

10.1017/pds.2021.581 ◽

2021 ◽

Vol 1 ◽

pp. 3199-3208

Author(s):

Emanuel Balzan ◽

Pierre Vella ◽

Philip Farrugia ◽

Edward Abela ◽

Glenn Cassar ◽

...

Keyword(s):

Medical Devices ◽

Early Stage ◽

Design Stage ◽

Concept Design ◽

Proof Of Concept ◽

Detailed Design ◽

Testing Framework ◽

Medical Products ◽

Manufacturing Technologies ◽

Validation Testing

AbstractResearch funded projects are often concerned with the development of proof-of-concept products. Consequently, activities related to verification and validation testing (VVT) are often not considered in depth, even though various design iterations are carried out to refine an idea. Furthermore, the introduction of additive manufacturing (AM) has facilitated, in particular, the development of bespoke medical products. End bespoke products, which will be used by relevant stakeholders (e.g. patients and clinicians) are fabricated with the same manufacturing technologies used during prototyping. As a result, the detailed design stage of products fabricated by AM is much shorter. Therefore, to improve the market-readiness of bespoke medical devices, testing must be integrated within the development from an early stage, allowing better planning of resources. To address these issues, in this paper, a comprehensive VVT framework is proposed for research projects, which lack a VVT infrastructure. The framework builds up on previous studies and methods utilised in industry to enable project key experts to capture risks as early as the concept design stage.

Download Full-text

Controlling Origami Stability Profile Using Magnets

Volume 5B: 42nd Mechanisms and Robotics Conference ◽

10.1115/detc2018-85712 ◽

2018 ◽

Author(s):

Hongbin Fang ◽

Tse-Shao Chang ◽

K. W. Wang

Keyword(s):

Potential Energy ◽

Wide Spectrum ◽

Concept Design ◽

Proof Of Concept ◽

Potential Energy Landscape ◽

Mechanical Metamaterials ◽

Elastic Potential Energy ◽

The Stability ◽

Novel Applications ◽

Stable Structures

Multi-stable structures and materials have attracted extensive research interests because they can provide a wide spectrum of adaptive properties and functionalities. Recently, origami has been identified as an important source for achieving multi-stability and has been exploited for developing unconventional mechanical metamaterials and metastructures. Once the crease pattern and the constituent materials have been specified for an origami structure, its multi-stability profile becomes unchangeable. On the other hand, a controllable profile would be desirable to endow the origami structures and origami metamaterials with further adaptability and versatility. This research investigates how to integrate magnets with origami to fundamentally alter the stability profiles. By embedding magnets into the origami facets or vertices, the magnetic potential energy would modify the original elastic potential energy landscape both quantitatively and qualitatively. Taking the stacked Miura-ori structures as examples, we show that different magnet assignments could either enrich the original bistable profile into a tri-stable or quad-stable profile, or simplify it into a mono-stable profile. Simultaneously, such magnet-induced evolutions of stability profile would trigger essential changes of the structure’s mechanical properties, which are promising to be used for developing multi-functional devices or metamaterials/metastructures. In this paper, in addition to the analyses, proof-of-concept design and prototype are presented. The results of this research would open up a new path for designing origami structures and metamaterials with controllable stability profiles that can be harnessed for many novel applications.

Download Full-text

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

Innovations Technology and Techniques in Cardiothoracic and Vascular Surgery ◽

10.1097/imi.0000000000000226 ◽

2016 ◽

Vol 11 (2) ◽

pp. 99-105 ◽

Cited By ~ 4

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.

Download Full-text

Absorption performance optimization of perforated plate using multiple-sized holes and a porous separating partition

Applied Acoustics ◽

10.1016/j.apacoust.2017.01.004 ◽

2017 ◽

Vol 120 ◽

pp. 21-33 ◽

Cited By ~ 5

Author(s):

Ki Hyun Kim ◽

Gil Ho Yoon

Keyword(s):

Performance Optimization ◽

Perforated Plate ◽

Absorption Performance

Download Full-text

Injury Profile SIMulator, a Qualitative Aggregative Modelling Framework to Predict Injury Profile as a Function of Cropping Practices, and Abiotic and Biotic Environment. II. Proof of Concept: Design of IPSIM-Wheat-Eyespot

PLoS ONE ◽

10.1371/journal.pone.0075829 ◽

2013 ◽

Vol 8 (10) ◽

pp. e75829 ◽

Cited By ~ 10

Author(s):

Marie-Hélène Robin ◽

Nathalie Colbach ◽

Philippe Lucas ◽

Françoise Montfort ◽

Célia Cholez ◽

...

Keyword(s):

Concept Design ◽

Proof Of Concept ◽

Modelling Framework ◽

Cropping Practices ◽

Biotic Environment

Download Full-text

Task based conceptual design of a testing machine

MATEC Web of Conferences ◽

10.1051/matecconf/201928701008 ◽

2019 ◽

Vol 287 ◽

pp. 01008

Author(s):

Hrayr Darbinyan

Keyword(s):

Conceptual Design ◽

Power Transmission ◽

Mechanical Design ◽

Design Method ◽

Testing Machine ◽

General Concept ◽

Test Machine ◽

Concept Design ◽

Original Design ◽

Design Cycle

A novel approach of task based conceptual design(TBCD) has been successfully used as direct guider and efficient developer of unique mechanical structures for many cases of mechanical design. Nearly a decade long efforts of elaboration of efficient every day usage formats for this method have been ended in convenient design pages suitable and applicable for revealing, describing, visualizing and managing the data necessary for organizing the design process from task definition to solutions satisfying original design tasks. The aim of current study is to show steps of a solution generation within frames of a single design cycle and extend this action over consecutive design cycles. Those steps are described from standpoint of general concept design method starting from key model and finished with final aggregation matrice as ultimate step of a single design cycle. Unified mathematical expressions are used for introduction and description of all worked out and developed components of conceptual design. The paper is arranged in a way to show gradual steps of conceptual design(CD) of a power transmission system – a pipe wrench life test machine.

Download Full-text