scholarly journals The Design Of A Quick Release Attachment Mechanism For A Hydrofoil Board

2021 ◽  
Author(s):  
Zarya O. Blackwood
Keyword(s):  
Compressive Strength ◽  
Market Research ◽  
General Concept ◽  
Primary Objective ◽  
Quick Release ◽  
Design Concepts ◽  
Final Design ◽  
Cyclical Loading ◽  
Attachment Mechanism ◽  
Project Objectives

<div>The primary objective of this project was to design a quick attach and detach system for use with a surfing foilboard. Foilboards are comprised of a board, mast, and fuselage, onto which wings are attached. These components are generally held together by long bolts, which makes the overall board tedious to assemble and disassemble. Research was conducted on the general concept of attaching components rigidly as well as on the market of current foilboard quick attach mechanisms, and a series of conceptual designs were created from it. All design concepts were rated using metrics generated from both the project objectives and market research, and the top-rated concept was then drawn up in Solidworks. Several design iterations were developed in order to meet both the minimum 300g weight, tensile and compressive strength, and attachment/detachment speed requirements. The design iterations were first validated using a series of Solidworks simulation analyses. Subsequently the final design candidate was analysed using a series of ANSYS Static Structural simulations. The final design can withstand the loads and torques during regular usage as well as cases of the rider standing on the side of the mast while the board is at rest. The design can be attached or detached within one second. It can survive up to 8.769x105 cycles of maximum cyclical loading and is easy to clean.</div>

scholarly journals The Design Of A Quick Release Attachment Mechanism For A Hydrofoil Board

2021 ◽  
Author(s):  
Zarya O. Blackwood
Keyword(s):  
Compressive Strength ◽  
Market Research ◽  
General Concept ◽  
Primary Objective ◽  
Quick Release ◽  
Design Concepts ◽  
Final Design ◽  
Cyclical Loading ◽  
Attachment Mechanism ◽  
Project Objectives

<div>The primary objective of this project was to design a quick attach and detach system for use with a surfing foilboard. Foilboards are comprised of a board, mast, and fuselage, onto which wings are attached. These components are generally held together by long bolts, which makes the overall board tedious to assemble and disassemble. Research was conducted on the general concept of attaching components rigidly as well as on the market of current foilboard quick attach mechanisms, and a series of conceptual designs were created from it. All design concepts were rated using metrics generated from both the project objectives and market research, and the top-rated concept was then drawn up in Solidworks. Several design iterations were developed in order to meet both the minimum 300g weight, tensile and compressive strength, and attachment/detachment speed requirements. The design iterations were first validated using a series of Solidworks simulation analyses. Subsequently the final design candidate was analysed using a series of ANSYS Static Structural simulations. The final design can withstand the loads and torques during regular usage as well as cases of the rider standing on the side of the mast while the board is at rest. The design can be attached or detached within one second. It can survive up to 8.769x105 cycles of maximum cyclical loading and is easy to clean.</div>

scholarly journals On the use of time-domain simulation in the design of Remotely Operated Submergible Vehicles

2017 ◽  
Vol 11 (21) ◽  
pp. 41
Author(s):  
Juan A. Ramírez-Macías ◽  
Persijn Brongers ◽  
Rafael E. Vásquez
Keyword(s):  
Time Domain ◽  
Equations Of Motion ◽  
Simulation Software ◽  
Rigid Body Dynamics ◽  
Time Domain Simulation ◽  
Levels Of Abstraction ◽  
Remotely Operated Vehicle ◽  
Design Concepts ◽  
Use Of Time ◽  
Final Design

Designing a Remotely Operated Vehicle (ROV) is a complicated task in which the design team deals with a considerable amount of uncertainty before the device is able to be tested at full scale. A way to cope with such uncertainty is to use simulation software to evaluate design concepts along the different levels of abstraction of the process. In this work, the use of aNySIM, the Maritime Research Institute Netherlands (MARIN) multibody time-domain simulation tool, as a part of the design process of an ROV is addressed. The simulation software is able to solve the equations of motion of the vehicle based on rigid body dynamics, including features such as hydrodynamics, hydrostatics, thrusters, thrust allocation, and PID control. Different simulation scenarios are proposed to evaluate different concept solutions to the design, including thruster parameters and distribution. The results are further used to select the concept solutions to be implemented in the final design.

Setup and initial testing of an endoscope manipulator system for assistance in transoral endoscopic surgery

2019 ◽  
Vol 64 (3) ◽  
pp. 347-356
Author(s):  
Axel Boese ◽  
Philipp Hündorf ◽  
Christoph Arens ◽  
Daniel T. Friedrich ◽  
Michael Friebe
Keyword(s):  
General Concept ◽  
Single Type ◽  
Transoral Surgery ◽  
Prototype System ◽  
Clinical Workflow ◽  
Posterior Commissure ◽  
Vocal Cords ◽  
Quick Release ◽  
Special Cases ◽  
Microlaryngeal Surgery

Abstract Purpose For the treatment of malignant diseases of the oral cavity and the larynx, a total or partial resection is the standard therapy, while in special cases chemo- and/or external radiation therapy is considered. Transoral access reduces trauma and hospitalization time. Transoral surgery is usually executed using external microscopic imaging. Therefore, the microscope is placed in the visual line of the opening of the mouth and throat. However, specific anatomical structures like the posterior commissure (dorsal end of the vocal cords) are not visible in these procedures. An endoscopic approach can improve this problem. We introduce a new prototype system for endoscopic assisted transoral surgery. Methods Based on clinical observation and discussions with professional users and surgeons, the clinical need was identified and specified. A general concept or an endoscopic manipulator to assist microlaryngeal surgery was designed. For that a steerable rigid endoscope was combined with an actuator that allows translational and rotational movement. A quick release fastener was designed allowing for fast change of the endoscope and independence from its shape and type. The actuator was fixed on a commercially available, semi-active medical holding arm for easy positioning. The holder can be fixed to the standard rails of the surgical table. The piezoelectric drives integrated in the actuator are activated with a foot pedal. This allows easy and fast fine positioning, while the hands are free to perform the surgery with standard instruments for microlaryngeal surgery. Results A prototype of the system for endoscopic assisted transoral surgery was developed. The entire technical setup was tested in terms of usability and performance in a simulated surgical scenario. A basic phantom, representing the throat and vocal cords was created and placed on a surgical table. The system was installed on the table and the clinical workflow of a simulated endoscopic assisted surgery on the vocal cords was performed. The performance of the setup and the procedure success was evaluated by clinical users. Conclusion Fixture of the system on the surgical table is fast and easy due to its low weight and compact design. The medical holder allows a fast initial positioning of the system in front of the phantom patient. An easy insertion and removal of the endoscope was realized using the quick release fastener. The developed endoscope fixation is universally adaptable and not limited to a single type of endoscope. The piezoelectric drives, combined with the foot pedal, allow a precise placement and readjustment of the endoscope during surgery. The use of a multi view endoscope enables a variable view on the surgical situs. The size and shape of the whole setup offer excellent access to the targeted structures. The development was classified beneficial by the clinical users.

The ‘Sliding Meniscus’ Knee Prosthesis: Design Concepts

1979 ◽  
Vol 8 (4) ◽  
pp. 201-205 ◽  
Author(s):  
R J Minns ◽  
J Campbell
Keyword(s):  
Femoral Component ◽  
Sagittal Plane ◽  
Knee Prosthesis ◽  
Femoral Condyle ◽  
Lower Surface ◽  
Range Of Movement ◽  
Design Concepts ◽  
Final Design ◽  
Movement Study ◽  
Surface Examination

A ‘sliding meniscus’ knee prosthesis is proposed which includes design concepts as a consequence of biomechanical analyses undertaken. The biomechanical techniques included a range of movement study of the knee, knee force mechanics, mechanical testing, photoelastic studies and surface examination for loading and wear areas of the prosthetic components all of which led to a final design shape and size for a total knee joint replacement prosthesis. The prosthesis has a ‘polycentric’ femoral component which does not have to be precisely aligned in the femoral condyle; a tibial plateau which completely covers the cortex around the periphery of the tibia, horizontal alignment is necessary for this component; and four thicknesses of the sliding meniscus component which is congruent in the sagittal plane with the femoral component during load-bearing and flat on its lower surface for decreased wear and contact stress-levels.

The ‘Working Body’: Interrogating and Reimagining the Productivist Impulses of Transhumanism through Crip-Centered Speculative Design

Somatechnics ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 327-354
Author(s):  
Franchesca Spektor ◽  
Sarah Fox
Keyword(s):  
Assistive Technologies ◽  
Assistive Devices ◽  
Disabled People ◽  
Planned Obsolescence ◽  
Design Concepts ◽  
Assistive Robots ◽  
Final Design ◽  
Care Relationships ◽  
Design Proposal ◽  
Speculative Design

Appeals to ‘nature’ have historically led to normative claims about who is rendered valuable. These understandings elevate a universal, working body (read able-bodied, white, producing capital) that design and disability studies scholar Aimi Hamraie argues ‘has served as a template […] for centuries’ (2017: 20), becoming reified through our architectural, political, and technological infrastructures. Using the framing of the cyborg, we explore how contemporary assistive technologies have the potential to both reproduce and trouble such normative claims. The modern transhumanism movement imagines cyborg bodies as self-contained and invincible, championing assistive technologies that seek to assimilate disabled people towards ever-increasing standards of independent productivity and connecting worth with the body's capacity for labor. In contrast, disability justice communities see all bodies as inherently worthy and situated within a network of care-relationships. Rather than being invincible, the cripborg's relationship with technology is complicated by the ever-present functional and financial constraints of their assistive devices. Despite these lived experiences, the expertise and agency of disabled activist communities is rarely engaged throughout the design process. In this article, we use speculative design techniques to reimagine assistive technologies with members of disability communities, resulting in three fictional design proposals. The first is a manual for a malfunctioning exoskeleton, meant to fill in the gaps where corporate planned obsolescence and black-boxed design delimit repair and maintenance. The second is a zine instructing readers on how to build their own intimate prosthetics, emphasizing the need to design for pleasurable, embodied, and affective experience. The final design proposal is a city-owned fleet of assistive robots meant to push people in manual wheelchairs up hills or carry loads for elderly people, an example of an environmental adaptation which explores the problems of automating care. With and through these design concepts, we begin to explore assistive devices that center the values of disability communities, using design proposals to co-imagine versions of a more crip-centered future.

Single-fiber myosin heavy chain polymorphism during postnatal development: modulation by hypothyroidism

2000 ◽  
Vol 278 (4) ◽  
pp. R1099-R1106 ◽  
Author(s):  
Nick A. di Maso ◽  
Vincent J. Caiozzo ◽  
Kenneth M. Baldwin
Keyword(s):  
Myosin Heavy Chain ◽  
Postnatal Development ◽  
Heavy Chain ◽  
Time Course ◽  
Developmental Time ◽  
General Concept ◽  
Primary Objective ◽  
Single Fiber ◽  
Fiber Types ◽  
Mhc Polymorphism

The primary objective of this study was to follow the developmental time course of myosin heavy chain (MHC) isoform transitions in single fibers of the rodent plantaris muscle. Hypothyroidism was used in conjunction with single-fiber analyses to better describe a possible linkage between the neonatal and fast type IIB MHC isoforms during development. In contrast to the general concept that developmental MHC isoform transitions give rise to muscle fibers that express only a single MHC isoform, the single-fiber analyses revealed a very high degree of MHC polymorphism throughout postnatal development. In the adult state, MHC polymorphism was so pervasive that the rodent plantaris muscles contained ∼12–15 different pools of fibers (i.e., fiber types). The degree of polymorphism observed at the single-fiber level made it difficult to determine specific developmental schemes analogous to those observed previously for the rodent soleus muscle. However, hypothyroidism was useful in that it confirmed a possible link between the developmental regulation of the neonatal and fast type IIB MHC isoforms.

scholarly journals DESAIN SARANA BAWA DENGAN MEJA PORTABEL UNTUK PERALATAN MENGGAMBAR ILUSTRATOR DIGITAL

2020 ◽  
Vol 6 (2) ◽  
Author(s):  
Hilvan Maulana ◽  
Dwi Cahyadi
Keyword(s):  
Data Collection ◽  
Design Methods ◽  
Design Concepts ◽  
Planning And Design ◽  
Facilities Design ◽  
Final Design ◽  
Design Proposal ◽  
Alternative Designs ◽  
And Storage ◽  
Additional Option

ABSTRAK Menggambar adalah kegiatan meniru barang, manusia, binatang dan sebagainya yang dibuat dengan coretan pensil atau alat lainnya pada sebuah media. Orang yang menggambar dengan teknik digital atau bekerja sebagai pembuat ilustrasi digital biasa disebut sebagai Ilustrator Digital. Meskipun ilustrator digital sudah merupakan profesi yang memiliki peralatannya sendiri untuk dipakai akan tetapi belum ada media atau sarana bawa yang dikhususkan untuk membawa peralatan menggambar tersebut. Selain sarana bawa, meja yang bisa dibawa kemanapun saat pergi keluar dapat menjadi opsi tambahan ketika seorang ilustrator ingin menggambar di luar di tempat yang tidak tersedia meja. Tujuan yang ingin dicapai dalam perancangan produk ini adalah membuat produk berupa sarana bawa dan penyimpanan untuk peralatan menggambar Ilustrator Digital yang ergonomis dan sesuai dengan karakter ilustrator digital, memiliki dimensi yang sesuai dengan peralatan menggambar yang dibawa dan dapat dijadikan alas untuk menggambar. Dengan berbagai metode perencanaan dan perancangan yang diantaranya adalah pengumpulan data, konsep desain, alternatif desain, pengembangan desain hingga mencapai desain akhir, diharapkan usulan desain ini dapat memberi masukan bagi pihak-pihak terkait untuk dapat melengkapi hal-hal yang belum tercapai pada Desain Sarana Bawa Dengan Meja Portabel Untuk Peralatan Menggambar Ilustrator Digital ini. Kata kunci: ilustrator digital, sarana bawa, meja portabel, peralatan menggambar   ABSTRACT Drawing is an activity to imitate goods, humans, animals and so on that are made with pencil strokes or other tools on a media. People who draw with digital techniques or work as digital illustration makers are commonly referred to as Digital Illustrators. Even though digital illustrators are already professions that have their own equipment to use, there is no media or means to carry specifically to carry the drawing equipment. In addition to carrying facilities, a table that can be carried anywhere when going out can be an additional option when an illustrator wants to draw outside where there is no table. The goal to be achieved in designing this product is to make a product in the form of a vehicle and storage for drawing equipment Digital illustrators who are ergonomic and in accordance with the character of digital illustrators, have dimensions that are suitable for drawing equipment that can be used as a base for drawing. With a variety of planning and design methods which include data collection, design concepts, alternative designs, development of designs to achieve the final design, it is expected that this design proposal can provide input for relevant parties to be able to complete the things that have not been achieved in the Carrying Facilities Design With Portable Tables For Digital Illustrator's Drawing Equipment. Keywords: digital illustrator, means of carrying, portable desk, drawing equipment

scholarly journals The Ecological Touchstones of Our Identity : Confronting Native Landscapes with the Cultural and Ecological Identity of New Zealand's Society

2021 ◽  
Author(s):  
◽  
Jaime Macfarlane
Keyword(s):  
New Zealand ◽  
Cultural Awareness ◽  
Educational Opportunity ◽  
Methodological Approach ◽  
Lowland Forest ◽  
Colonial Era ◽  
True Nature ◽  
Post Colonial ◽  
Design Concepts ◽  
Final Design

<p>‘Ecological Touchstones of Our Identity’ explores the ways in which the language of New Zealand’s landscapes have been transformed by colonisation as New Zealand undergoes transition into a post-colonial era. This thesis identifies how three uniquely native New Zealand landscapes, the Beach, the Swamp and the Bush, have become lost to New Zealanders, both physically and conceptually, through the gradual transitions of time and contested histories. Although these landscapes are perceived within New Zealand’s culture as uniquely native to New Zealand, their true nature is somehow lost on many. Such unique landscapes coalesce into one very important landscape - the transect of the lowland forest - which has been all but lost from the fabric of our landscapes. This thesis uses a methodological approach wherein a range of dualities are explored in opposition to each other. The concept of biculturalism between Māori and Pākehā; the orientation between the vertical and horizontal, the gaze versus the object; wetland and bushland versus pastureland; and, most importantly, the perceived duality of nature versus culture. This latter point will be challenged through the theory and design concepts presented in this thesis. The final design outcome deals with the practicalities of generating a strong knowledge base of eco-sourcing and regeneration of national importance by creating a functioning seedbank between the two sites selected: the Museum of New Zealand -Te Papa Tongarewa and Lake Waiwiri (Lake Papaitonga). The vision is to regenerate the lowland forest transect between Lake Waiwiri and the coastal edge back into the functioning ecosystem once present, while structuring this regeneration to act as a cultural tool for strengthening New Zealand's sense of ecological cultural awareness, and thereby, identity. The role that landscape architecture and architecture play within this system of regeneration is critically explored through form and conceptual process, cumulating to a scheme which presents the educational opportunity of integrating these two different sites into one functioning ecosystem of regeneration.</p>

Micro-Electrostatic Vibration-to-Electricity Converters

2002 ◽  
Author(s):  
Shad Roundy ◽  
Paul K. Wright ◽  
Kristofer S. J. Pister
Keyword(s):  
Vlsi Design ◽  
Silicon On Insulator ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Design Parameters ◽  
Optimized Design ◽  
Wireless Sensor Nodes ◽  
Design Concepts ◽  
Final Design ◽  
Low Power Vlsi Design

Advances in low power VLSI design, along with the potentially low duty cycle of wireless sensor nodes open up the possibility of powering small wireless computing devices from scavenged ambient power. Low level vibrations occurring in typical household, office, and manufacturing environments are considered as a possible power source for wireless sensor nodes. This work focuses on the design of electrostatic vibration-to-electricity converters using MEMS fabrications technology. Detailed models of three different design concepts are developed. The three design concepts are evaluated and compared based on simulations and practical considerations. A formal optimization of the preferred design concept is performed, and a final design is produced using the optimal design parameters. Simulations of the optimized design show that an output power density of 116 μW/cm3 is possible from input vibrations of 2.25 m/s2 at 120 Hz. Test devices have been designed for a Deep Reactive Ion Etching (DRIE) process that etches MEMS structures into the top layer of a Silicon On Insulator (SOI) wafer. The devices are currently being fabricated.

scholarly journals Scale Effect and Correlation between Uniaxial Compressive Strength and Point Load Index for Limestone and Travertine

2021 ◽  
Vol 11 (8) ◽  
pp. 3672
Author(s):  
Solange Contreras ◽  
Manuel Saldaña ◽  
Norman Toro ◽  
Ignacio Pérez-Rey ◽  
Manuel A. González ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Scale Effect ◽  
Statistical Models ◽  
Primary Objective ◽  
Point Load ◽  
Reliable Estimate ◽  
Point Load Index ◽  
Statistical Adjustment ◽  
Early Phases

Determining the uniaxial compressive strength of intact rock is the primary objective of a geomechanical project, and a reliable estimate in the early phases saves time and costs for more sophisticated laboratory tests. The problem is knowing which of the correlations between the resistance to uniaxial compression and point load index are reliable, those that cover one or several types of rock (depending on the type of statistical adjustment). In this work, they were evaluated with respect to limestone and travertine from experimental results, and the statistical models of the scale effect of the point load index were determined, and the uniaxial compressive strength being estimated from correlations reported in literature. The limestone model was ascending (strength increases as diameter increases), while the travertine model was descending (strength decreases as diameter increases), obtaining similar exponents for the scale effect equations modeled from the uniaxial compressive strength and point load index in both cases.

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