1 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, 22-23 / 11 / 2007 Vibration.

Slides:



Advertisements
Similar presentations
1 ZonicBook/618EZ-Analyst Resonance Testing & Data Recording.
Advertisements

ZonicBook/618EZ-TOMAS Rotating Machinery Monitoring and Analysis
EC Fans.
Finite Element Method CHAPTER 4: FEM FOR TRUSSES
1 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 2.1 Chapter 2.
By D. Fisher Geometric Transformations. Reflection, Rotation, or Translation 1.
Learning Introductory Signal Processing Using Multimedia 1 Outline Overview of Information and Communications Some signal processing concepts Tools available.
Business Transaction Management Software for Application Coordination 1 Business Processes and Coordination.
Chp 13 Sound and Music.
IN SITU VIBRATION EXPERIMENTS ON INTACT AND MODIFIED BUILDINGS INTEREST FOR VULNERABILITY ANALYSIS C. BOUTIN, S. HANS 1.Experiment : structural identification.
Ventilation Fan Aeroelastic Analysis
In this work the question was, why did the fan fail in fatigue during
Jeopardy Q 1 Q 6 Q 11 Q 16 Q 21 Q 2 Q 7 Q 12 Q 17 Q 22 Q 3 Q 8 Q 13
Jeopardy Q 1 Q 6 Q 11 Q 16 Q 21 Q 2 Q 7 Q 12 Q 17 Q 22 Q 3 Q 8 Q 13
Title Subtitle.
Jeopardy Q 1 Q 6 Q 11 Q 16 Q 21 Q 2 Q 7 Q 12 Q 17 Q 22 Q 3 Q 8 Q 13
0 - 0.
DIVIDING INTEGERS 1. IF THE SIGNS ARE THE SAME THE ANSWER IS POSITIVE 2. IF THE SIGNS ARE DIFFERENT THE ANSWER IS NEGATIVE.
Addition Facts
INVESTIGATION OF LOCAL STATISTICAL CHARACTERISTICS OF TURBULENT WIND FLOW IN ATMOSPHERE BOUNDARY LAYER WITH OBSTACLES Yuriy Nekrasov, Sergey Turbin.
ZMQS ZMQS
Communicating over the Network
Micro Focus Research 1 As far as youre aware, how does your organization plan to drive business growth over the next three years? (Respondents' first choices)
Richmond House, Liverpool (1) 26 th January 2004.
Midterm Exam One-week take-home exam, to cover material of HW#1-6
SOUNDS GOOD! From musical boxes to iPods. 2 Space Walk Aug 2005 Stephen Robinson outside Discovery NASA picture.
BT Wholesale October Creating your own telephone network WHOLESALE CALLS LINE ASSOCIATED.
FINAL FOCUS: COMBINATION OF PRE ISOLATOR AND ACTIVE STABILISATION K. Artoos, C. Collette, R. Leuxe, C.Eymin, P. Fernandez, S. Janssens * The research leading.
Scheduled Model Predictive Control of Wind turbines in Above Rated Wind Avishek Kumar Dr Karl Stol Department of Mechanical Engineering.
Box and Whisker Plots.
ABC Technology Project
High Frequency Distortion in Power Grids due to Electronic Equipment Anders Larsson Luleå University of Technology.
MondayTuesdayWednesdayThursdayFriday 1 2 CLOSED – 4th of July weekend 5 CLOSED – 4th of July weekend 6 Photoshop Elements Color Replacement Clone Stamp.
Squares and Square Root WALK. Solve each problem REVIEW:
Speech Coding Workshop 2000 Jean-Marc Valin, Roch Lefebvre 1 IEEE Speech Coding Workshop Sept 17–20, 2000 Lake Lawn Resort Delavan, WI Jean-Marc Valin,
Lets play bingo!!. Calculate: MEAN Calculate: MEDIAN
Chapter 5 Test Review Sections 5-1 through 5-4.
SIMOCODE-DP Software.
GG Consulting, LLC I-SUITE. Source: TEA SHARS Frequently asked questions 2.
Addition 1’s to 20.
25 seconds left…...
Week 1.
1/23 A. Giraudeau, F. Pierron MPSVA conference Identification of local material damping in vibrating plates using full-field measurements Alain.
We will resume in: 25 Minutes.
Bell Schedules Club Time is available from 8:05-8:20  1 st 8:20 – 9:15  2 nd 9:20 – 10:10  3 rd 10:15 – 11:05  4 th 11:10 – 12:50 A(11:10)
TASK: Skill Development A proportional relationship is a set of equivalent ratios. Equivalent ratios have equal values using different numbers. Creating.
Chapter 13: Digital Control Systems 1 ©2000, John Wiley & Sons, Inc. Nise/Control Systems Engineering, 3/e Chapter 13 Digital Control Systems.
How Cells Obtain Energy from Food
Frequency Response This is an extremely important topic in EE. Up until this point we have analyzed circuits without considering the effect on the answer.
Accelerometer’s for Wind Turbines Alternative Energy Wind turbines are a growing source of alternative clean energy sources. As individual machines, or.
Vanderbilt University Vibro-Acoustics Laboratory 1 Decentralized Structural Acoustic Control of a Launch Vehicle Payload Fairing Kenneth D Frampton Dept.
Flow Produced Noise & Fluid Mechanical Treatment Flow Produced Noise & Fluid Mechanical Treatment Prepared By: Eng. Ashraf Al-Shalalfeh Mechanical Engineering.
Mechanical Vibrations
On the Accuracy of Modal Parameters Identified from Exponentially Windowed, Noise Contaminated Impulse Responses for a System with a Large Range of Decay.
Bio-Inspired Trailing Edge Noise Control
Study of Oscillating Blades from Stable to Stalled Conditions 1 CFD Lab, Department of Aerospace Engineering, University of Glasgow 2 Volvo Aero Corporation.
A Survey of Aeroacoustic Considerations in Wind Turbines Robert Scott AE 6060.
Chaparral Physics Research
REVOLUTIONARY AERODYNAMICS The Sinha- Deturbulator Sumon K. Sinha, Ph.D., P.E, SINHATECH, 3607 Lyles Drive Oxford, Mississippi
Improving Performance of a Heavy Duty Engine Cooling Drive Through Reduction of Drag Losses Design Recommendations & Future Analysis CFD Analysis It is.
MODULE 08 MULTIDEGREE OF FREEDOM SYSTEMS. 2 Structure vibrating in a given mode can be considered as the Single Degree of Freedom (SDOF) system. Structure.
UT-BATTELLE New method for modeling acoustic waves in plates A powerful boundary element method is developed for plate geometry The new method achieves.
Starter Look at your marked homework.
G. Koscsó – M. Gutermuth – Zs. Kasza – T. Tábi
Tuned Mass Damper Investigation for Apache Struts
Introduction 1 - Separation 1.1 What is separation?
DATA COMMUNICATION Lecture-13.
Yoshiyuki Obuchi NAOJ / Mechanical Engineering shop Dec. 29th 2016
Interference and Resonance
Review of the Modal Analysis of the MiniBooNE Horn MH1
Presentation transcript:

1 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Vibration analysis and noise reduction of the swinging unit

2 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Noise components of ducted fans Flow source  Trace noise  Noise of the turbulent boundary layer  Noise of the separated flow region Mechanical source  Noise of the drive train  Noise of the excited cover  Noise of the PWM control

3 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Flow source noises Trace noise Noise of the turbulent boundary layer

4 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Flow source noises Noise of the separated boundary layer Proper and improper constructions for the entrance region (1) Separation bubble (1)Laminar sublayer (2)Turbulent boundary layer

5 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Mechanical source noises Finite element modal analysis DOF: N. of elements: Solver: COSMOS Mesh:Mode shape at Hz:

6 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Mechanical source noises Results Number of natural frequencies in each 20 Hz range

7 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Measurement Four-channel-measurement  2 accelerometers  microphone  tachometer

8 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Measurement Zero pitch Max pitch direction 1 Max pitch direction 2

9 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Waterfall diagrams Microphone signal compared with finite element results

10 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Waterfall diagrams Microphone signal scaled by rpm

11 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Waterfall diagrams The 8 kHz PWM noise appearing in the signal of the 2nd accelerometer

12 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 The 8 kHz PWM noise appearing in the signal of the microphone

13 / 13 Vibration analysis and noise reduction of the swinging unit Magyar Bálint (BME) A C R O B O T E R 3rd OSB meeting Reading, / 11 / 2007 Conclusions Reduction or elimination of noise components Flow source components  Trace noise - Not significant  Noise of the turbulent boundary layer - By choosing better airfoil  Noise of the separated flow region - Proper contstruction of the entrance region Mechanical source components  Noise of the excited cover - By increasing stiffness, rarefying natural frequencies  Noise of the PWM control - By raising controller frequency above human hearing limit Estimated total possible noise reduction: