Sound Testing Gage R&R problem

Y

ypwang

#1
We have one machine to measure motor sound level when motor is running at certain speed. It will measure sound level at different frequencies.

We have performed GR&R but results are quite poor. Attached file is data we collected.

Do you think it is reasonable to use GR&R for assess repeatability or is there any other method to guarantee the machine repeatability?
 

Attachments

Elsmar Forum Sponsor

Miner

Forum Moderator
Staff member
Admin
#2
Re: Sound Testing GR&R problem

I will analyze your data tomorrow. However, since I have some experience with sound testing of motors, I can speculate on some probable causes for your problem:

  • The sound source may vary with time (motor heats up, bearing grease thins out, brushes seat (DC motor only))
  • The sound source varies with speed and the speed varies
  • Fixturing (clamp position and pressure can change sound level)
  • The orientation of the motor affects the load on the bearings and can affect the sound level
  • The distance from mike to sound source varies
  • The orientation of mike in relation to sound source varies
  • Background ambient noise levels, if an anechoic chamber is not used (What sound level does the meter read when the motor is not running?)
  • Incorrect selection of meter scale, averaging, peak, etc.
 

Miner

Forum Moderator
Staff member
Admin
#3
I took a look at your data. It looks like the test might feasibly be improved to the point that it would be useful for inspection, but it has a lot of work before it would be useful for process control.

The entire issue is in the repeatability of the test, not the reproducibility. All of the issues that I described in the previous post would primarily fall into the repeatability category. A few could fall into both categories.

I would investigate those possibilities and repeat the study.
 

MasterBB

Involved In Discussions
#4
We have one machine to measure motor sound level when motor is running at certain speed. It will measure sound level at different frequencies.

We have performed GR&R but results are quite poor. Attached file is data we collected.

Do you think it is reasonable to use GR&R for assess repeatability or is there any other method to guarantee the machine repeatability?
I would investigate other outputs than (Hz)...

There are many metrics for Sound Quality & most likely should not be just one.
I've done this many years ago..
Recommendation is to get a Sound Quality Expert..
Some of the outputs you may want to look at:

a. dB
b. Sones = Transient Loudness
c. Roughness
d. Fluctuation
e. Clarity
f. Others (I can't remember)
 

Miner

Forum Moderator
Staff member
Admin
#5
I would investigate other outputs than (Hz)...

There are many metrics for Sound Quality & most likely should not be just one.
I've done this many years ago..
Recommendation is to get a Sound Quality Expert..
Some of the outputs you may want to look at:

a. dB
b. Sones = Transient Loudness
c. Roughness
d. Fluctuation
e. Clarity
f. Others (I can't remember)
FYI. The data are dB levels at 4 separate frequencies. I recognize the levels from motor noise testing that I have performed.
 
Thread starter Similar threads Forum Replies Date
T How do I analyze the Sound Quality Testing of vacuum cleaners? Misc. Quality Assurance and Business Systems Related Topics 9
M Interesting article - Analysis of Risk: Are Current Methods Theoretically Sound? ISO 14971 - Medical Device Risk Management 7
I Gages to Measure Noise (Sound) General Measurement Device and Calibration Topics 10
DanteCaspian Recommended Andons? Building 3 light-4 light andons, with or without sound Lean in Manufacturing and Service Industries 8
D Layout Inspection - Sound systems to a German car manufacturer IATF 16949 - Automotive Quality Systems Standard 2
B Statistically Sound Data Sampling Technique for Internal Audits Inspection, Prints (Drawings), Testing, Sampling and Related Topics 14
R Rms Spl And Peak Spl Spectrum - Sound Level Spectrum Reliability Analysis - Predictions, Testing and Standards 7
W Safe and Sound Software: Creating an Efficient and Effective Quality System for Softw Book, Video, Blog and Web Site Reviews and Recommendations 1
Marc Wal-Mart's Giant Sucking Sound World News 31
J Silly it may sound, but how to set smart goals? Misc. Quality Assurance and Business Systems Related Topics 8
E 60601-1 - Tilt testing - Tensile safety factor IEC 60601 - Medical Electrical Equipment Safety Standards Series 1
V Setup for testing against ISO14708 clause 16 (protection of the patient from herms caused by heat) Other Medical Device Related Standards 0
gramps What do you think about automated QA testing For software app industry? Misc. Quality Assurance and Business Systems Related Topics 5
B In house NIOSH pre Testing accepted by NIOSH? US Food and Drug Administration (FDA) 1
M Bacteriostasis/Fungistasis Testing Other Medical Device and Orthopedic Related Topics 6
P Sample Size for Distribution Simulation Testing Inspection, Prints (Drawings), Testing, Sampling and Related Topics 11
N EN 813, EN 12277, EN 1497 - Testing some harness prototypes to an EN standard Various Other Specifications, Standards, and related Requirements 0
S What should i choose for "testing procedure" characteristics? (N95) General Information Resources 0
D Essential performance and EMC immunity testing IEC 60601 - Medical Electrical Equipment Safety Standards Series 4
J Biocompatbility testing on Class 1 device requirements Other US Medical Device Regulations 12
Q Summative Usability Evaluation Testing: prior or during Clinical Investigation? Human Factors and Ergonomics in Engineering 6
B NIOSH Approval for Surgical N95 Respirators - Required testing US Food and Drug Administration (FDA) 2
M ECG lead leakage currents - How to specify ECG leads during electrical safety testing IEC 60601 - Medical Electrical Equipment Safety Standards Series 5
C Stress / Challenge Conditions for Design Verification Testing to Reduce Sample Size 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 11
D CFR Title 14: Aeronautics and Space PART 120—DRUG AND ALCOHOL TESTING PROGRAM Federal Aviation Administration (FAA) Standards and Requirements 3
lanley liao Purchase Acceptance Criteria - Tensile testing Oil and Gas Industry Standards and Regulations 2
M Device mounted at IV pole - what about mechanical stability testing? IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
A Outsourcing IEC 60601-1 Ed 3.2 Testing IEC 60601 - Medical Electrical Equipment Safety Standards Series 0
J Cochlear Implant Testing 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
A Class I (exempt) testing requirements Other Medical Device Related Standards 0
JoCam Electrical Testing for Japan, PSE or CB Scheme Other Medical Device Regulations World-Wide 0
M Who are the go to companies for non-destructive hardness testing? General Measurement Device and Calibration Topics 3
M Determining if an Insulin Pen Testing Machine is a Medical Device? EU Medical Device Regulations 4
P Testing cloud-based backups IT (Information Technology) Service Management 7
I IATF Lab Scope Testing Qualification and Competency Documentation IATF 16949 - Automotive Quality Systems Standard 3
N Chemical Testing on Medical Devices - Solutions in a container closure system (bag) EU Medical Device Regulations 1
M Comparing data from destructive testing Inspection, Prints (Drawings), Testing, Sampling and Related Topics 7
T Flammability testing Reliability Analysis - Predictions, Testing and Standards 0
E Manufacturers should develop a testing device for covid19 Service Industry Specific Topics 0
K When is Bioburden Testing Required? Other Medical Device Related Standards 4
K IEC 62304 - Testing Independance IEC 62304 - Medical Device Software Life Cycle Processes 5
A ANSI/AAMI versions of 60601-1-2 and related testing requirements Other Medical Device Related Standards 3
C Surgical mask stability testing (CE mark) EU Medical Device Regulations 2
Beliz Biocompatibility Testing for Laser Epilation Device EU Medical Device Regulations 2
C One Time Service Supplier - Temperature and Humidity Testing Service ISO 13485:2016 - Medical Device Quality Management Systems 5
D IEC 60601-1 - Service life testing IEC 60601 - Medical Electrical Equipment Safety Standards Series 8
P Flammability Testing of Aircraft Interior Materials Federal Aviation Administration (FAA) Standards and Requirements 0
N Usability testing required for FDA IDE (investigational device exemption)? Human Factors and Ergonomics in Engineering 8
E ASTM F2118 - Fatigue testing of bone cement - Changes between the 2003 and the 2014? Other Medical Device Related Standards 1
K Biocompatibility Testing - Multile products of different sizes and shapes US Food and Drug Administration (FDA) 2

Similar threads

Top Bottom