PACCAR & RBEI MBD & TCS CO-OPERATION
ROBERT BOSCH ENGINEERING AND BUSINESS SOLUTION LIMITED (RBEI)
Optimizing Diesel Engine Technology using Data Analysis in MATLAB
ROBERT BOSCH ENGINEERING AND BUSINESS SOLUTION LIMITED (RBEI)
RBEI/ETC | 8/7/2016
© Robert Bosch Engineering and Business Solutions Private Limited 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the
event of applications for industrial property rights.
2
Noise – Data Sources
Industrial Machinery & Processes Diesel Engine
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
3
Tones?
Model Based Design & Development
Domain Expertise
Test & Measurement
Code Generation
Simulink & TargetLink
Toolbox:
Tones are noises with a narrow sound
frequency composition
Annoying tones source: machinery
with rotating parts
such as motors, gearboxes, fans and
pumps often create tones
Psychoacoustic metrics such as
TONE TO NOISE RATIO
The human ear functions as a dynamic
band pass filter. Only one tone can be
distinguished within a critical band.
Psychoacoustic metrics such as
PROMINENCE RATIO
Tones can be identified subjectively by
listening.
Psychoacoustic metrics such as the
Tonality
Pure Tones are waveforms that occur
at a Single Frequency
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
4
Knocking?
Model Based Design & Development
Diesel knock is the clanking, rattling sound
emitted from a running diesel engine.
Diesel Engines are becoming extremely
popular due to its good fuel economy
Knocking index : impulsive noise analysis
parameter for engine sound quality
The ability to maximize power and fuel
economy by optimizing spark timing for a
given air/fuel ratio is limited by engine knock
Tuning vehicle NVH Parameter is a key
aspect of the powertrain development process
Effect on the
perceived
quality of
vehicles
01 02Misinterpreted
by customers as
defects
05
Influence on
vehicle interior
Sound Quality
0403Adherence
to Legal
Requireme
nts
Customer
Preference of
Vehicles with
little Diesel
Knocking
Introduction Knocking Effects
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
5
Knocking Index : Impulsive Noise
Model Based Design & Development
Impulse noise is a category of (acoustic)
noise which includes unwanted, almost
instantaneous (thus impulse-like) sharp
sounds.
Knocking Index is an impulsive noise
analysis parameter for engine sound
quality
Noise consisting of random occurrences
of energy spikes having random
amplitude and spectral content.
Impulsive Noise Definition
Crank Angle
Cylin
der
Pre
ssure
Impulsive Engine Noise Signature
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
6
Noise Vibration Harshness : Psychoacoustics
Model Based Design & Development
Knocking
Index
Tone-To-
Noise Ratio
Prominence
Ratio
Software Demo
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
7
Prominence Ratio
Model Based Design & Development
FFT analysis
[Configurable Parameters] SPL
Spectrum
Calc. Critical
Band
Calc. overall SPL
in Middle Critical
Band
Calc. overall SPL
in Lower Critical
Band
Calc. overall SPL
in Upper Critical
Band
Determine PR for
the given tone
SPL : Sound Pressure Level : PR : Prominence Ratio
FFT(data), Data Windowing 20log(FFT /0.00002)
Design & Analyze Hamming, Kaiser, Gaussian, Hanning & other windows done using Matlab Signal
Processing Toolbox
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
8
Prominence Ratio Results
Model Based Design & Development
Determination of Level of Middle
critical band : ECMA 74 Standard
Determination of Prominence Ratio
: ECMA 74 Standard
Spectral Analysis & Signal Modeling is done using Matlab Signal Processing Toolbox
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
9
Prominence Ratio Results
Model Based Design & Development
PR : Discrete Tone Identification
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
10
Workflow Tone to Noise Ratio
Model Based Design & DevelopmentFFT analysis
[Configurable
Parameters]
Calculate
Discrete Tone Level
Determination of
Masking noise level
Determination of
Tone-to-noise ratio
Parallel Processing of Data of various measurement file done using Parallel
computing Toolbox
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
11
Workflow Tone to Noise Ratio
Masking Noise Level
Tone to Noise Ratio : ECMA-74
Prominent Discrete for TNR method
Multiple Tones in Critical Band:
ECMA-74
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
12
Tone to Noise Ratio Results
Model Based Design & Development
TNR : Single Tone TNR : Multiple Tones
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
13
Knocking Index : Approach
Identification of Noise
types &
Characteristics
Data
Analytics
Knocking
Index
Noise Types:
1.Knocking
2.Rattling
3.Ticking(Injectors)
4.Tonal Noise
Noise Characteristics:
1.Impulsivness
Database Toolbox
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
14
Infrastructure
Matlab
Compiler
Database
Toolbox
DSP
Toolbox
Signal
Processing
Toolbox
Matlab
R2015b
RBEI/ETC | 8/7/2016
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event of applications for industrial property rights.
15
Summary
Easy to identify & configure threshold parameters as per ECMA
standard.
Performance improvement in the validation of the
components
One platform to perform Data Preprocessing & post
processing
The characteristic features of Diesel sounds can be identified
and quantified
Separation of Engine Noise sources & Analysis of Impulsive
Noise
RBEI | 8/7/2016
© Robert Bosch Engineering and Business Solutions Private Limited 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the
event of applications for industrial property rights.
16
Thank You
RBEI/ETC | 8/7/2016
© Robert Bosch Engineering and Business Solutions Private Limited 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the
event of applications for industrial property rights.
17
Images & References
http://www.bosch.com/en/com/home/index.php
http://in.mathworks.com/products/matlab/
http://www.ecma-international.org/publications/standards/Ecma-074.htm
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