Auralization of Flyover Noise from Open Rotor Engines Using Model Scale Test Data

2014 ◽  
Author(s):  
Stephen A. Rizzi ◽  
David Stephens ◽  
Jeffrey J. Berton ◽  
Dale E. Van Zante ◽  
John Wojno ◽  
...  
Keyword(s):  
Test Data ◽  
Model Scale ◽  
Open Rotor ◽  
Scale Test

Auralization of Flyover Noise from Open-Rotor Engines Using Model-Scale Test Data

2016 ◽  
Vol 53 (1) ◽  
pp. 117-128 ◽  
Author(s):  
Stephen A. Rizzi ◽  
David B. Stephens ◽  
Jeffrey J. Berton ◽  
Dale E. Van Zante ◽  
John P. Wojno ◽  
...  
Keyword(s):  
Test Data ◽  
Model Scale ◽  
Open Rotor ◽  
Scale Test

scholarly journals DEVELOPMENT OF INDONESIAN LANGUAGE SKILLS INSTRUCTIONAL MATERIALS BASED PROJECT BASED LEARNING WITH INQUIRY APPROACH

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Arum Ratnaningsih ◽  
Titi Anjarini
Keyword(s):  
Data Analysis ◽  
Test Data ◽  
Research Method ◽  
Language Skills ◽  
Learning Model ◽  
Project Based Learning ◽  
Instructional Materials ◽  
Inquiry Approach ◽  
Scale Test ◽  
Bahasa Indonesia

<p><em>The background of this study is the lack of confidence in the use of Indonesian language so that passive students in lecturing activities. The purpose of this study is for humanist learning, active, and fun. Research method of R &amp; D with learning model of Project Based Learning (PBL) and Inquiry approach. Subjects in this study were PGSD students of University of Muhammadiyah Purworejo totaling 130 students divided into 2 classes as experimental class, 2 classes as control class, and 1 class of scale test. Data analysis used in this research is source triangulation, triangulation method, instrument triangulation, and SPSS. The result of this research is the improvement of Indonesian language skills of PGSD students. The experimental class has a higher score than the control class, so it can be concluded that the PBL learning model can significantly improve the PGSD students' skill in Bahasa Indonesia University of Muhammadiyah Purworejo.</em></p>

Floating Wind Turbine Model Test to Verify a MoorDyn Modification for Nonlinear Elastic Materials

2021 ◽  
pp. 1-41
Author(s):  
William M West ◽  
Andrew J. Goupee ◽  
Christopher Allen ◽  
Anthony M. Viselli
Keyword(s):  
Test Data ◽  
Offshore Wind ◽  
Strain Response ◽  
Design Load ◽  
Jacket Structures ◽  
Scale Test ◽  
Numerical Tools ◽  
Nonlinear Elastic ◽  
Strain Responses ◽  
Offshore Wind Industry

Abstract As the Floating Offshore Wind industry matures it has become increasingly important for researchers to determine the next generation materials and processes that will allow platforms to be deployed in intermediate (50-85 m) water depths which challenge the efficiency of traditional catenary chain mooring systems and fixed-bottom jacket structures. One such technology, synthetic ropes, have in recent years come to the forefront of this effort. The challenge of designing synthetic rope moorings is the complex nonlinear tension-strain response inherent of some rope material choices. Currently, many numerical tools for modeling the dynamic behavior of FOWTs are limited to mooring materials that have a linear tension- strain response. In this paper an open source FOWT design and analysis program, OpenFAST, was modified to capture the more complex tension-strain responses of synthetic ropes. Simulations from the modified OpenFAST tool were then compared with 1:52-scale test data for a 6MW FOWT Semi- submersible platform in 55m of water subjected to representative design load cases. A strong correlation between the simulations and test data was observed.

Low-Cycle Fatigue Evaluation Using the Weld Master S-N Curve

2006 ◽  
Author(s):  
P. Dong ◽  
Z. Cao ◽  
J. K. Hong
Keyword(s):  
Test Data ◽  
Low Cycle Fatigue ◽  
Strain Curve ◽  
Cyclic Stress ◽  
Structural Stress ◽  
Stress Strain ◽  
Strain Behavior ◽  
Scale Test ◽  
Stress Estimation ◽  
Fatigue Evaluation

In the context of fatigue evaluation in the low-cycle regime, the use of the master S-N curve in conjunction with elastic FE-based structural stress calculations is presented. An elastic pseudo structural stress estimation is introduced by assuming that Neuber’s rule applies in relating structural stress and strain concentration at a weld to the material’s cyclic stress-strain behavior. With the pseudo structural stress procedure, recent sources of recent full scale test data on pipe and vessel welds were analyzed as a validation of the proposed procedure. The estimated fatigue lives versus actual test lives show a reasonable agreement. Finally, the feasibility of using monotonic stress-strain curves as a first approximation is also examined for applications when cyclic stress-strain curve may not be readily found. The analysis results indicate that the life estimations using monotonic stress-strain curves are reasonable, with the recent test data falling within mean ± 2σ, where σ represents the standard deviation of the master S-N curve.

scholarly journals From Bench-scale Test Data To Predictors Of Full-scale Fire Test Results

2005 ◽  
Vol 8 ◽  
pp. 469-480 ◽  
Author(s):  
S. Nam ◽  
J. De Ris ◽  
Peter Wu ◽  
R. Bill
Keyword(s):  
Test Data ◽  
Fire Test ◽  
Full Scale ◽  
Test Results ◽  
Bench Scale ◽  
Scale Test ◽  
Bench Scale Test

Proposing an Updated AM2 Mat Performance Criteria Model

2019 ◽  
Vol 2674 (8) ◽  
pp. 604-615
Author(s):  
Jeremiah M. Stache ◽  
Carlos R. Gonzalez ◽  
Timothy W. Rushing ◽  
Lyan I. Garcia
Keyword(s):  
Test Data ◽  
Performance Index ◽  
Permanent Deformation ◽  
Performance Criteria ◽  
Families Of Curves ◽  
Proposed Model ◽  
Scale Test ◽  
The Military ◽  
Airfield Mat ◽  
Single Regression

The AM2 mat system is historically one of the most deployed portable airfield mats in the military. The current AM2 airfield mat performance criteria for determining the number of coverages an AM2 mat can sustain before failure is an empirically correlated model and cannot accurately predict the number of coverages to failure beyond lower subgrade (California bearing ration) CBR or for modern aircraft with multiple tire configurations. This paper presents a stress-based model that predicts the number of coverages to failure using the maximum deviator stress as the performance index normalized by the subgrade CBR. The proposed model addresses different aircraft tire configurations on the AM2 mat over subgrade CBR values extending up to 100. Some improvements made to current criteria include (1) the addition of more test data at higher subgrade CBR values, (2) a fitted curve that more reasonably addresses early permanent deformation failures due to loads at low CBR, (3) a reasonable “cap” to the service life of an AM2 mat due to failure from mat breakage at high CBR, (4) a consolidation of previous “families of curves” for different equivalent single wheel loads and CBR values into one single regression curve, and (5) a performance index calculated using layered elastic analysis ( WinJULEA). This paper presents a comparison of the proposed model with the current performance criteria against the full-scale test data. Results show that the proposed model has a high correlation to the test data ( R2 = 0.952) and performs very well with respect to the current performance criteria.

Performance Prediction of a 112m Wave-Piercing Catamaran

2018 ◽  
Vol Vol 160 (A4) ◽  
Author(s):  
E Kay ◽  
J Lavroff ◽  
M R Davis
Keyword(s):  
High Speed ◽  
Water Jet ◽  
Full Scale ◽  
Test Results ◽  
Model Scale ◽  
Shaft Power ◽  
High Froude Number ◽  
Scale Test ◽  
Power Measurements ◽  
Surrounding Fluid

The prediction of power required to propel a high-speed catamaran involves the hydrodynamic interactions between the hull surface and the surrounding fluid that may be difficult to compute numerically. In this study model-scale experiments are used as a basis for comparison to full-scale sea trials data measured on a 112m Incat wave-piercing catamaran to predict the full-scale powering requirements from model-scale testing. By completing water jet shaft power measurements on an Incat vessel during sea trials, comparison of these results was made to model-scale test results to provide good correlation. The work demonstrates that the International Towing Tank Conference (ITTC) extrapolation techniques used provide a good basis for extrapolating the data from model-scale to full-scale to predict the power requirements for the full-scale catamaran vessel operating at high Froude Number with water jet propulsion. This provides a useful tool for future designers and researchers for determining the power requirements of a catamaran vessel through model tests.

PERFORMANCE PREDICTION OF A 112M WAVE-PIERCING CATAMARAN

2021 ◽  
Vol 160 (A4) ◽  
Author(s):  
E Kay ◽  
J Lavroff ◽  
M R Davis
Keyword(s):  
High Speed ◽  
Water Jet ◽  
Full Scale ◽  
Test Results ◽  
Model Scale ◽  
Shaft Power ◽  
High Froude Number ◽  
Scale Test ◽  
Power Measurements ◽  
Surrounding Fluid

The prediction of power required to propel a high-speed catamaran involves the hydrodynamic interactions between the hull surface and the surrounding fluid that may be difficult to compute numerically. In this study model-scale experiments are used as a basis for comparison to full-scale sea trials data measured on a 112m Incat wave-piercing catamaran to predict the full-scale powering requirements from model-scale testing. By completing water jet shaft power measurements on an Incat vessel during sea trials, comparison of these results was made to model-scale test results to provide good correlation. The work demonstrates that the International Towing Tank Conference (ITTC) extrapolation techniques used provide a good basis for extrapolating the data from model-scale to full-scale to predict the power requirements for the full-scale catamaran vessel operating at high Froude Number with water jet propulsion. This provides a useful tool for future designers and researchers for determining the power requirements of a catamaran vessel through model tests.

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