scholarly journals Critical Design Parameters in Design and Efficacy of Upper‐Room UVC 254 Luminaire Systems: Part I: Overview of Major Parameters and Relationships †

2021 ◽  
Author(s):  
Paul Arthur Jensen
Keyword(s):  
Design Parameters ◽  
Critical Design ◽  
Upper Room

Design Quality and Reliability Through Technology Readiness

1989 ◽  
Author(s):  
J. Fox
Keyword(s):  
Product Launch ◽  
Design Parameters ◽  
Technology Readiness ◽  
Design Quality ◽  
Critical Design ◽  
Early Stages ◽  
Product Delivery ◽  
Quality And Reliability ◽  
The Relationship

Abstract This paper discusses the relationship between the growth of reliability in the early stages of a product delivery process and Technology Readiness, and describes the importance of ‘ready’ technologies if product launch schedules are to be achieved. Technology Readiness itself is defined and the enablers for it are identified. A process which has been developed is described, and some proposals for tracking and managing progress are made. Finally, the importance of critical design parameters both in the development of technologies and in understanding technology capabilities are described fully.

Steam Turbine Overspeed Scenarios: Comparison Between API Energy Method and Dynamic Simulation

2021 ◽  
Author(s):  
Fabrizio Piras ◽  
Federico Bucciarelli ◽  
Damaso Checcacci ◽  
Filippo Ingrasciotta
Keyword(s):  
Design Parameters ◽  
Steam Turbines ◽  
Analysis Method ◽  
Design Constraint ◽  
Rotating Speed ◽  
Critical Design ◽  
Operating Stress ◽  
Technological Challenge ◽  
Rotor Dynamic ◽  
Peak Value

Abstract In turbomachinery applications the possibility to reduce size and costs of main flow-path components, by increasing shaft rotating speed, has always been appealing. The technological challenge in increasing this power density capability is typically related to performance prediction, to operating stress in blades and shafts, as well as to the need for a more accurate rotor-dynamic analysis. Yet another aspect, often reduced to standard assessments in less demanding applications, is related to the analysis of overspeed scenarios where, following a sudden loss of load and/or driven inertia, the turbomachine shall maintain its mechanical integrity. Especially in steam turbines applications, where the behavior of the machine is strongly affected by the plant conditions, valves intervention time and connected volumes, the reduction of the rotor inertia, against comparable power, may produce overspeed scenarios that can become a primary design constraint and, if overlooked, may have both availability and safety implications. In this paper several approaches to the analysis of overspeed scenarios are discussed, with increasing level of detail. The energy-based overspeed analysis method, as required by API612, is first discussed against practical design cases. A more accurate dynamic model is then presented, and its results compared with those of the energy-based approach. Finally, the sensitivity analysis of the overspeed peak value with respect to critical design parameters is discussed. With respect to previous works, mostly based on load rejection scenarios, the main focus is on the scenario of sudden coupling loss.

Hydrodynamic Analysis of Submarine of the Wave Glider

2013 ◽  
Vol 834-836 ◽  
pp. 1505-1511 ◽  
Author(s):  
Li Juan Jia ◽  
Xuan Ming Zhang ◽  
Zhan Feng Qi ◽  
Yu Feng Qin ◽  
Xiu Jun Sun
Keyword(s):  
Wave Motion ◽  
Inflection Point ◽  
Design Parameters ◽  
Hydrodynamic Characteristics ◽  
Hydrodynamic Analysis ◽  
Critical Design ◽  
Ocean Wave Energy ◽  
Lift Curve ◽  
Wave Glider

Wave glider harvests the abundant ocean wave energy for long term ocean cruising due to its particular two-part architecture. Its submerged part named glider converts vertical fluctuation of waves to horizontally forward propulsion. Because of the uncertainty of the ocean condition and irregularity of its wave motion, the design parameters of the submerged glider vary in a confined range in the state of art design models. In order to indicate the hydrodynamic characteristics and summarize the dynamic law of the submerged glider with different design parameters, this paper concentrates on three critical design details: profile of the wings, interval space of the arrayed multiple flapping wings and maximum rotating angle of wings, and performs the corresponding CFD analysis. Finally, we conclude that the lift curve of NACA0006 and plate profile is almost the same with small waves at sea, but NACA0006 profile can generate much larger forward lift than the plate profile with seawater velocity up to 0.5m/s; Decreasing space of intermittent causes more obvious decrement of forward lift while space of intermittent overpasses the inflection point at 20cm; With the decrement of the maximum rotating angle, the forward lift occurs to take a sharp decline if the angle strides the inflection point.

A Preliminary Study on the Mechanical Performance of Tiled Polymer Composites

2006 ◽  
Author(s):  
M. A. Qidwai ◽  
J. N. Baucom ◽  
A. C. Leung ◽  
J. P. Thomas
Keyword(s):  
Composite Laminates ◽  
Load Transfer ◽  
Mechanical Performance ◽  
Local Stress ◽  
Superior Performance ◽  
Design Parameters ◽  
Interlaminar Stresses ◽  
Stress Concentrations ◽  
Critical Design ◽  
Composite Joint

We are developing and exploring the concept of in-plane tiling of composite laminates, called MOSAIC, to mitigate or control delamination at free edges due to interlaminar stresses. Initial mechanical testing has shown that MOSAIC composites with uniaxial graphite-fiber reinforced tiles retain the stiffness levels of traditional uniaxially reinforced composites but with reduced strength. The reduction in strength is attributed to the formation of resin-rich pockets between adjacent tiles. In this study, we have performed detailed finite element analyses to identify the critical design parameters that affect the mechanical performance of uniaxially reinforced MOSAIC composites. We have found that using continuous laminae on the outer surfaces significantly increases the overall loadcarrying capacity. Increasing aspect ratio of the pocket and decreasing material property differences between resin and tiles also cause better load transfer between tiles but may not necessarily improve overall strength due to increasing stress concentration. The tiling scheme and density of pocket placement influence the interaction of local stress concentrations. Consequently, a novel composite joint is proposed and found to have superior performance.

Friction-Induced Dynamics of Axially-Moving Media in Contact With an Actively-Positioned Surface

2008 ◽  
Author(s):  
V. Kartik ◽  
Evangelos Eleftheriou
Keyword(s):  
Data Storage ◽  
Surface Friction ◽  
Design Parameters ◽  
Moving Medium ◽  
Critical Design ◽  
Flexible Material ◽  
Potential Benefits ◽  
Axially Moving ◽  
The Stability ◽  
Moving Media

The dynamics of an axially-moving flexible medium are examined in the context of an application where the medium is partially supported by a frictional surface, that actively-orients itself relative to the direction of transport. The stability and motion of the medium are of interest in a magnetic tape data storage application where the orientation of a sensing surface is continuously altered in order to ‘follow’ the medium’s motion. Moving media that are in contact with such guiding surfaces experience friction excitations induced by the relative motion in addition to what is observed with a stationary guiding surface. Friction-induced bending moments, as well as tension fluctuation beyond the permissible limits for the flexible material can erode the potential benefits of such active positioning. This paper describes some of these dynamic phenomena using the simplified example of a planar guiding surface whose orientation is dynamically altered relative to the moving medium. A physical model for the friction-induced excitation of the moving medium is developed, and the dynamics are analyzed for their effect on critical design parameters such as the achievable bandwidth of the active control algorithm, as well as with respect to constraints on the geometry and positioning of the guiding surface.

scholarly journals A Parametric Study of the Effects of Critical Design Parameters on the Performance of Nanoscale Silicon Devices

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1987
Author(s):  
Faraz Kaiser Malik ◽  
Tariq Talha ◽  
Faisal Ahmed
Keyword(s):  
Heat Generation ◽  
Initial Temperature ◽  
Scattering Length ◽  
Monte Carlo Model ◽  
Generation Rate ◽  
Design Parameters ◽  
Heat Generation Rate ◽  
Short Channel ◽  
Critical Design ◽  
Silicon Devices

The current electronics industry has used the aggressive miniaturization of solid-state devices to meet future technological demands. The downscaling of characteristic device dimensions into the sub-10 nm regime causes them to fall below the electron–phonon scattering length, thereby resulting in a transition from quasi-ballistic to ballistic carrier transport. In this study, a well-established Monte Carlo model is employed to systematically investigate the effects of various parameters such as applied voltage, channel length, electrode lengths, electrode doping and initial temperature on the performance of nanoscale silicon devices. Interestingly, from the obtained results, the short channel devices are found to exhibit smaller heat generation, with a 2 nm channel device having roughly two-thirds the heat generation rate observed in an 8 nm channel device, which is attributed to reduced carrier scattering in the ballistic transport regime. Furthermore, the drain contacts of the devices are identified as critical design areas to ensure safe and efficient performance. The heat generation rate is observed to increase linearly with an increase in the applied electric field strength but does not change significantly with an increase in the initial temperature, despite a marked reduction in the electric current flowing through the device.

scholarly journals Evaluation of critical design parameters for RT‐qPCR‐based analysis of multiple dUTPase isoform genes in mice

FEBS Open Bio ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 1153-1170
Author(s):  
Gergely A. Rácz ◽  
Nikolett Nagy ◽  
Zoltán Gál ◽  
Tímea Pintér ◽  
László Hiripi ◽  
...  
Keyword(s):  
Design Parameters ◽  
Critical Design

On critical design parameters of reinforced thermoplastic pipes associated with the pipe-lay installation

2017 ◽  
Vol 12 (sup1) ◽  
pp. S134-S143 ◽  
Author(s):  
Yu Cao ◽  
Xiaochuan Yu ◽  
Ziyan Liu ◽  
Yong Bai ◽  
Xiang Gong
Keyword(s):  
Design Parameters ◽  
Critical Design

Critical Design Parameters To Prevent Gas Invasion During Cementing Operations

1983 ◽  
Author(s):  
C.E. Bannister ◽  
G.E. Shuster ◽  
L.A. Wooldridge ◽  
M.J. Jones ◽  
A.G. Birch
Keyword(s):  
Design Parameters ◽  
Critical Design
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