Axial fan noise: Towards sound prediction based on numerical unsteady flow data ‐ a case study

2008 ◽  
Vol 123 (5) ◽  
pp. 3539-3539 ◽  
Author(s):  
Hauke Reese ◽  
Thomas Carolus
Keyword(s):  
Unsteady Flow ◽  
Flow Data ◽  
Axial Fan ◽  
Fan Noise

Unsteady flow simulation using the curvilinear multiple-relaxation-time lattice Boltzmann method: Danube River case study

2019 ◽  
Vol 58 (2) ◽  
pp. 204-217
Author(s):  
Ljubomir Budinski ◽  
Emad Pouryazdanpanah Kermani ◽  
Sanja Ožvat ◽  
Julius Fabian ◽  
Matija Stipić
Keyword(s):  
Relaxation Time ◽  
Unsteady Flow ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Flow Simulation ◽  
Danube River ◽  
Multiple Relaxation Time ◽  
Boltzmann Method ◽  
Unsteady Flow Simulation

COMPUTATIONAL AERO-ACOUSTIC STUDY ON AXIAL FAN NOISE AND ITS CHARACTERISTICS

2017 ◽  
Vol 22 (2) ◽  
pp. 15-20
Author(s):  
I.Y. Jang ◽  
C.K. Han ◽  
Y.J. Moon
Keyword(s):  
Axial Fan ◽  
Fan Noise ◽  
Acoustic Study

scholarly journals Reactive control of subsonic axial fan noise in a duct

2014 ◽  
Vol 136 (4) ◽  
pp. 1619-1630 ◽  
Author(s):  
Y. Liu ◽  
Y. S. Choy ◽  
L. Huang ◽  
L. Cheng
Keyword(s):  
Reactive Control ◽  
Axial Fan ◽  
Fan Noise

A Ring Silencer Design for Reducing Noise of Axial Fan

2003 ◽  
Vol 03 (03) ◽  
pp. L259-L264
Author(s):  
Jian-Da Wu ◽  
Mingsian R. Bai
Keyword(s):  
Helmholtz Resonator ◽  
Boundary Region ◽  
Acoustic Analogy ◽  
Axial Fan ◽  
Noise Sources ◽  
Fan Noise ◽  
Fluctuating Pressure ◽  
Axial Fans ◽  
Fan Blade ◽  
Broadband Frequency

In this paper, a ring silencer design for reducing the noise of axial fans is presented. The noise sources on axial fans are usually caused by the fluctuating pressure distribution on the surface of fan blade. Most of the sources are near the trailing edge of blades or boundary region of blades. The ideation of proposed design is based on the principle of Helmholtz resonator for reducing the noise around the fan. The electro-acoustic analogy of this design is presented and simply discussed. Experimental measurement is carried out to evaluate the proposed design for reducing the axial fan noise. The result of experiment indicated that the ring silencer achieved 17 dB in blade passing frequency and 10 dB in other broadband frequency of power spectrum level.

A Velocity Parameter for the Correlation of Axial Fan Noise

1982 ◽  
Vol 19 (1) ◽  
pp. 17 ◽  
Author(s):  
T. Wright
Keyword(s):  
Axial Fan ◽  
Fan Noise ◽  
Velocity Parameter

scholarly journals An Analysis of Teachers’ Strategies in Conducting Speaking Assessments at MTSN Andalan Pekanbaru

2017 ◽  
Vol 4 (1) ◽  
pp. 1-14
Author(s):  
Andi Idayani ◽  
Rugaiyah Rugaiyah
Keyword(s):  
Data Analysis ◽  
Role Play ◽  
Qualitative Approach ◽  
Current Status ◽  
Flow Data ◽  
Teachers Perceptions ◽  
Analysis Process ◽  
Speaking Assessment ◽  
Speaking Skill

Teaching speaking is an important part in the language teaching, as well as the assessing speaking. Therefore, teachers need to use some strategies in conducting the assessing speaking. Based on that issue, this research was aimed at exploring teachers’ strategies in assessing speaking skill. To explore the problems, case study with a qualitative approach was adopted. This research employed observation, questionnaire and interview in collecting the data and involved five teachers from MTsNAndalanPekanbaru. The collected data were analyzed by using flow data analysis process of Miles &Huberman (1994). The findings revealed that teachers apply the strategy of conducting the speaking assessment in the classroom which are started from the way they identify current status of classroom speaking assessment, the purpose of their speaking assessment, types speaking assessment, then selecting the teachers’ strategies of speaking assessment and last, teachers’ perceptions of the effectiveness of classroom speaking assessment. In general, teachers implementing some strategies in conducting the speaking assessment. There were discussion and conversation, question and answer, role play, repetition, etc. This research was expected to broaden teachers’ knowledge about strategies in assessing speaking in terms of the purpose and the type of assessment used, then teachers’ perceptions of speaking assessment.

Sustainable Process Analytics Formalism: A Case Study of Book Binding System for Energy Optimization

2013 ◽  
Author(s):  
Duck Bong Kim ◽  
Guodong Shao ◽  
Alexander Brodsky ◽  
Ryan Consylman
Keyword(s):  
Energy Efficiency ◽  
Preliminary Analysis ◽  
Energy Optimization ◽  
Optimization Techniques ◽  
Flow Data ◽  
Improve Energy Efficiency ◽  
Process Analytics ◽  
Manufacturing Optimization ◽  
Provide Decision Support

Energy is considered as one of the important factors for manufacturers to achieve the sustainability objective. To improve energy efficiency in manufacturing, optimization techniques are essential to provide decision support. However, formulating and solving energy optimization in manufacturing is still time-consuming and difficult due to its complexity with a broad scope. In addition, it is a challenging task since it requires substantial development efforts and modeling expertise. To address this drawback, Sustainable Process Analytics Formalism (SPAF) is proposed to facilitate the modeling and optimization. In this paper, SPAF will be applied to a case study of energy optimization for a book binding production system for its feasibility validation. The knowledge of process flow, data, and metrics of the case study is represented using SPAF, and a preliminary analysis of optimization results was performed.

Prediction of axial fan noise by linearized perturbed compressible equations with large eddy simulation.

2010 ◽  
Vol 127 (3) ◽  
pp. 1837-1837
Author(s):  
Young J. Moon ◽  
Hoyeon Kim ◽  
Youngmin Bae ◽  
Florent Ravelet ◽  
Sofiane Khelladi ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Axial Fan ◽  
Fan Noise ◽  
Eddy Simulation ◽  
Large Eddy
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