scholarly journals A generic wake analysis tool and its application to the Japan Bulk Carrier test case

2019 ◽  
Vol 171 ◽  
pp. 575-589 ◽  
Author(s):  
Matthias Maasch ◽  
Kurt Mizzi ◽  
Mehmet Atlar ◽  
Patrick Fitzsimmons ◽  
Osman Turan
Keyword(s):  
Test Case ◽  
Analysis Tool ◽  
Bulk Carrier ◽  
Carrier Test

Development and Testing of an Automated Building Commissioning Analysis Tool (ABCAT)

2010 ◽  
Author(s):  
John D. Bynum ◽  
David E. Claridge ◽  
Jonathan M. Curtin
Keyword(s):  
Energy Consumption ◽  
Large Scale ◽  
Weather Conditions ◽  
The United States ◽  
Commercial Buildings ◽  
Test Case ◽  
Analysis Tool ◽  
Component Level ◽  
Building Commissioning ◽  
Occupant Comfort

Experience has shown that buildings on average may consume 20% more energy than required for occupant comfort which by one estimate leads to $18 billion wasted annually on energy costs in commercial buildings in the United States. Experience and large scale studies of the benefits of commissioning have shown the effectiveness of these services in improving the energy efficiency of commercial buildings. While commissioning services do help reduce energy consumption and improve performance of buildings, the benefits of the commissioning tend to degrade over time. In order to prolong the benefits of commissioning, a prototype fault detection and diagnostic (FDD) tool intended to aid in reducing excess energy consumption known as an Automated Building Commissioning Analysis Tool (ABCAT) has been developed. ABCAT is a first principles based whole building level top down FDD tool which does not require the level of expertise and money often associated with more detailed component level methods. The model based ABCAT tool uses the ASHRAE Simplified Energy Analysis Procedure (SEAP) which requires a smaller number of inputs than more sophisticated simulation methods such as EnergyPlus or DOE-2. ABCAT utilizes a calibrated mathematical model, white box method, to predict energy consumption for given weather conditions. A detailed description of the methodology is presented along with test application results from more than 20 building years worth of retrospective applications and greater than five building years worth of live test case applications. In this testing, the ABCAT tool was used to successfully identify 24 significant energy consumption deviations in five retrospective applications and five significant energy consumption deviations in four live applications.

Nearfield Acoustic Holography Using Energy-Based Measurements

2005 ◽  
Author(s):  
Michael C. Harris ◽  
Jonathan D. Blotter ◽  
Scott D. Sommerfeldt ◽  
Hans-Elias de Bree
Keyword(s):  
Microphone Array ◽  
Analytical Models ◽  
Acquisition Time ◽  
Test Case ◽  
Reconstruction Method ◽  
Analysis Tool ◽  
Analytical Prediction ◽  
Acoustic Holography ◽  
Data Acquisition Time ◽  
Nearfield Acoustic Holography

Since its conception in 1980, nearfield acoustic holography (NAH) has become an accepted analysis tool with a number of commercial packages now available. One limitation of NAH is that the acoustic field is reconstructed through a spatial sampling. Therefore, this technique becomes less efficient at higher frequencies where microphone array spacing must be reduced. Analytical models have indicated that an NAH method relying on energy-based measurements will provide the same reconstruction resolution of current NAH methods with significantly fewer measurement locations. This would lead to a considerable savings in data acquisition time for scanning array systems and reduce the inefficiency at high frequencies. The energy-based reconstruction method will be introduced. Experimental results will be presented for a planar test case and the resulting reconstruction accuracy will be compared to the analytical prediction model.

CAD-Based Adjoint Optimization of the Stresses in a Radial Turbine

2017 ◽  
Author(s):  
Tom Verstraete ◽  
Lasse Müller ◽  
Jens-Dominik Müller
Keyword(s):  
Structural Model ◽  
Computational Cost ◽  
Test Case ◽  
Analysis Tool ◽  
Full Potential ◽  
Cad Model ◽  
Stress Concentrations ◽  
Radial Turbine ◽  
Gradient Based ◽  
Von Mises

The design optimization of turbomachinery components has witnessed an increased attention in last decade, and is currently used in many companies in the daily design cycle. The adjoint method proves to have the highest potential in this field, however, has still two major shortcomings before its full potential can be used: 1) the shape is mainly parameterized by its grid and the connection to the CAD model is lost, and 2) the optimization process includes only aerodynamic performance and neglects stress and vibration requirements. Within this paper a methodology is developed to include stress calculations into a gradient-based framework, which requires the differentiation of a stress analysis tool. To allow combining the sensitivities from the structural model with those from the aero performance, the CAD model is used for parameterizing the shape, effectively defining a parametrization that controls both the fluid and solid domain that remain linked to each other without creating voids between both models. The method is tested on a radial turbine test case in which the meridional layout is optimized to reduce the maximum von Mises stresses in the material. The results demonstrate a significant reduction in stress concentrations with a limited computational cost.

scholarly journals A VISUAL ANALYTICS OF MOVEMENT DATA OF A WASTE COLLECTION SERVICE: A TOOL FOR SMART CITIES

2020 ◽  
Vol VI-4/W2-2020 ◽  
pp. 111-118
Author(s):  
A. Moreno ◽  
D. I. Hernandez ◽  
D. Moreno ◽  
M. Caglioni ◽  
J. T. Hernandez
Keyword(s):  
Waste Management ◽  
Visual Analytics ◽  
Visual Analysis ◽  
Solid Waste Management ◽  
Smart Cities ◽  
Test Case ◽  
Analysis Tool ◽  
Waste Collection ◽  
Movement Data ◽  
Management Context

Abstract. Solid waste management is an important urban issue to be addressed in every city. In the smart city context, waste collection allows massive collection of data representing movements, provided by satellite tracking technologies and sensors on waste collection equipment. For decision makers to take advantage of this opportunity, an analytical tool suitable for the waste management context, able to visualize the complexity of the data and to deal with different types of formats in which the data is stored is required.The aim of this paper is to evaluate the potential of an interactive data analysis tool, based on R and R-Shiny, to better understand the particularities of a waste collection service and how it relates to the local city context. The User-centered Analysis-Task driven model (AVIMEU) is presented. The model is organized into seven components: database load, classification panel, multivariate analysis, concurrency, origin-destination, points of interest and itinerary. The model was implemented as a test case for the waste collection service of the city of Pasto in the southwest of Colombia. It is shown that the model based on visual analysis is a promising approach that should be further enhanced. The analyses are oriented in such a way that they provide practical information to the agents or experts of the service. The model is available on the site https://github.com/MerariFonseca/AVIMEU-visual-analytics-for-movement-data-in-R .

Performance Evaluation of Gas Turbine Labyrinth Seals Using Computational Fluid Dynamics

2007 ◽  
Author(s):  
Bambang I. Soemarwoto ◽  
Johan C. Kok ◽  
Koen M. J. de Cock ◽  
Arjen B. Kloosterman ◽  
Gerrit A. Kool ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Stokes Equations ◽  
Real Life ◽  
Labyrinth Seal ◽  
Test Case ◽  
Analysis Tool ◽  
Labyrinth Seals ◽  
Seal Design ◽  
Flow Through

The paper presents an investigation on the characteristics of flow through labyrinth seals. The focus of the paper lies in the application of the Computational Fluid Dynamics (CFD) methodology. The Reynolds-Averaged Navier-Stokes equations are employed as the flow governing equations. Turbulence is incorporated through a variant of the two-equation k-ω turbulence model. Three test cases are considered. The first test case concerns a labyrinth seal configuration with a honeycomb land. The computational results are compared to those obtained from seal test rig measurements. The second test case addresses the same labyrinth seal where the honeycomb land is replaced by a solid smooth land. The third test case addresses the flow through a labyrinth seal with canted knives. The CFD method is considered as an analysis tool complementary to rig-testing and enables investigating the effect of new seal design features. Additionally CFD is seen as a tool to support the correct representation of test-data in semiempirical engineering models for seal design. An industrial perspective is presented towards the exploitation of these modeling capabilities for real-life design of seals.

Extension of an Unsteady Hybrid Navier-Stokes/Vortex-Panel Solver to Wind Turbine Aerodynamic Simulations at Higher Yaw Angles

2014 ◽  
Author(s):  
Kensuke Suzuki ◽  
Sven Schmitz ◽  
Hua Ouyang ◽  
Jean-Jacques Chattot
Keyword(s):  
Wind Turbine ◽  
Computational Cost ◽  
Unsteady Aerodynamics ◽  
Navier Stokes ◽  
Test Case ◽  
Analysis Tool ◽  
Horizontal Axis Wind Turbine ◽  
Work Station ◽  
Lower Estimation ◽  
Free Wake

A new analysis tool, an unsteady Hybrid Navier-Stokes/Vortex model, for a horizontal axis wind turbine (HAWT) has been developed for yawed flow by coupling a prescribed wake Vortex Line Method (VLM) with an unsteady Navier-Stokes solver, and its convergence and computational cost have been studied for 10 and 20 degrees of yaw. In this study, a steady viscous solution of a hybrid method is compared in detail with a full-scale Navier-Stokes simulation as a validation. Furthermore, the unsteady hybrid solver is applied to the NREL Unsteady Aerodynamics Experiment (UAE) Phase VI rotor. A test case under 10 degrees of yaw shows that the global power output agrees well with the NREL experiment, and 10 cycles of computation require less than three days using a work station under a serial CPU simulation. The same simulation performed using a super computer is used as reference, and it is estimated that the equivalent case can be obtained about 8 times faster using the work station with the present method, while keeping the same level of accuracy, than a full-domain Navier-Stokes simulation. To treat high yaw cases, new distorted prescribed vortex sheets are modeled with the VLM code. To see the difference between the base helix and the distorted helicoidal wake, unsteady hybrid VLM/Navier-Stokes solutions are examined for selected azimuth angles, and results are contrasted to a free wake BEM and NREL experimental data. For low yaw angles, the base helix approximation agrees well with the distorted helix, and yield better prediction than a free wake model, whereas for high yaw angles of more than 30 degrees, the present distorted wake gave a lower estimation of rotor torque than the free wake solver.

Enabling Early and Fast Thermal Simulation for 3D Multi-Die System Designs

2019 ◽  
Vol 2019 (DPC) ◽  
pp. 000955-000976
Author(s):  
Tunir Dey ◽  
Kazunari Koga ◽  
Humair Mandavia
Keyword(s):  
Data Transfer ◽  
Design Flow ◽  
System Level ◽  
Test Case ◽  
Analysis Tool ◽  
Model Simplification ◽  
Time To Market ◽  
Engineering Teams ◽  
Design Cycle ◽  
System Designs

As design complexity increases with 3DICs and time-to-market becomes a critical component in the automotive, wearables and IoT segments, reducing design cycle time while maintaining accuracy of analysis has become all the more important. To address this, a system level co-design approach in step with multi-physics analysis is presented. To mitigate errors due to manual exchange of data between various engineering teams spread across chip, package and board with design and analysis adding further level of exchange, a design flow incorporating simplification at the layout level is shown. The flow enables various levels of simplified models to be used, wherein data transfer between the complex 3D structures in layout to the thermal analysis tool is automated. The efficacy of the model simplification is verified through a test case showing comparable results for the simplified and full models.

Ethnogeriatrics: Development and Application of the Cohort Analysis Tool

2014 ◽  
Vol 21 (2) ◽  
pp. 37-52
Author(s):  
Melen McBride
Keyword(s):  
Healthcare Professionals ◽  
Cohort Analysis ◽  
Analysis Tool ◽  
Speech Language Pathology ◽  
Clinical Tool ◽  
Research Activities ◽  
Key Concepts ◽  
Practice Teaching ◽  
Language Pathology ◽  
Significant Factors

Ethnogeriatrics is an evolving specialty in geriatric care that focuses on the health and aging issues in the context of culture for older adults from diverse ethnic backgrounds. This article is an introduction to ethnogeriatrics for healthcare professionals including speech-language pathologists (SLPs). This article focuses on significant factors that contributed to the development of ethnogeriatrics, definitions of some key concepts in ethnogeriatrics, introduces cohort analysis as a teaching and clinical tool, and presents applications for speech-language pathology with recommendations for use of cohort analysis in practice, teaching, and research activities.

“I Can See What You’re Saying”: Clinical Utility of Spectral Moment Analysis

2011 ◽  
Vol 21 (2) ◽  
pp. 44-54
Author(s):  
Kerry Callahan Mandulak
Keyword(s):  
Speech Production ◽  
Speech Signal ◽  
Clinical Utility ◽  
Acoustic Analysis ◽  
Moment Analysis ◽  
Analysis Tool ◽  
Spectral Moment ◽  
Clinical Measure ◽  
Perceptual Analysis ◽  
Disordered Speech

Spectral moment analysis (SMA) is an acoustic analysis tool that shows promise for enhancing our understanding of normal and disordered speech production. It can augment auditory-perceptual analysis used to investigate differences across speakers and groups and can provide unique information regarding specific aspects of the speech signal. The purpose of this paper is to illustrate the utility of SMA as a clinical measure for both clinical speech production assessment and research applications documenting speech outcome measurements. Although acoustic analysis has become more readily available and accessible, clinicians need training with, and exposure to, acoustic analysis methods in order to integrate them into traditional methods used to assess speech production.

Sign in / Sign up

Export Citation Format

Share Document