Optimization of Air Induction System for Acoustic Performance · Optimization of Air Induction...

Optimization of Air Induction System for Acoustic Performance Sri Siva Sai Meduri QuEST Global Services Pte Ltd

Sundaram V, Sathish Kumar S FCA Engineering India Pvt Ltd

GT CONFERENCE INDIA 2015 – Pune, India.

Dec 07, 2015.

©2015 FCA US LLC

Agenda

2

Overview

About Air Induction system

Engine Model Validation

Build Air Induction System

Transmission Loss Simulation

Snorkel Noise Simulation

Optimization of Air Induction system

Testing the Optimized Model

Results and Conclusion

©2015 FCA US LLC Dec 07, 2015 GT CONFERENCE INDIA 2015

Overview

3

Here we discuss the design and optimization of air induction

system for better NVH performance.

1D model is build and simulated for transmission loss and snorkel

noise in GT-POWER.

Key factors which control the design of air induction system to

attenuate the noise are identified during simulation.

Optimized air induction system model is developed for a chosen

engine noise.


About Air Induction system

4

Air Induction System fulfil a number of roles in an overall vehicle design

which are:

channel air to the engine;

filter particulates;

enhance engine performance through wave action tuning;

reduce noise.

• Clean Air

• Volumetric efficiency

Engine Performance

Air Induction System Design

• Less cabin noise

• Meet Regulatory norms

Acoustics


1D Modeling Flow Chart

5

Fig. 1D simulation Flow Chart

Design

CAD data 1D

Simulation Optimization

Testing Good

Correlation

Post

Process

Yes

Optimized

Design

No

Meeting the

Targets

Tune the system

Not Meeting the

Targets

Engine Model Validation

6

Engine GT-POWER Model is validated for the following parameters:

Volumetric efficiency

Brake power, Brake torque

Air flow rate, Gas flow rate

Gas flow temperature and others.

Throttle body

Intake

Manifold

Engine crank train

Exhaust

system

• Air Induction system to be added at throttle entry.


7

Build Air Induction System

Two existing designs of air induction system are considered to evolve a

better design for a 4 cylinder turbo charged engine.

Design 1 Design 2


8

Build Air Induction System Cont..

GEM3D

Shell

Discretization


GEM3D

General Flow Split

Discretization

Shell Discretization

• More Effective way to do acoustic analysis for

accurate results at higher frequency

• Time consumed to run the system level analysis

is more.

Flow Split Discretization

• Good enough to do acoustic analysis for

accurate results at low and mid range

frequency.

• Time consumed to run the system level

analysis is less.

9

Build Air Induction System Cont..


GT-ISE GEM3D

The dirty side, clean side ducts are modelled as pipe components. The air filter

box and resonators are modelled as flow split components.

Design 1

Design 2

Transmission Loss Simulation

10

Transmission loss is measured using a non linear transmission loss template.

Design 1 Design 2


Snorkel Noise Simulation

11

Snorkel noise is measured using an acoustic microphone placed at the snorkel.

Design 1 Design 2


1600 2600 3600 4600 5600

SPL

dB

(A)

Engine Speed (RPM)

Design 2 Overall Design 2 Order 2

Design 2 Order 4 Design 2 Order 6

1600 2600 3600 4600 5600

dB

(A)

RPM

Design 1-OVERALL Design 1 Order 2


12

Key design parameters

Wide open snorkel inlet

Volume of air box

Resonator added to dirty side duct, air

filter box and clean side duct

Optimization of Air Induction System


Optimized design parameters

Wide open snorkel inlet

Volume of air box

Resonator Air Filter Box

Snorkel

Inlet

13

Results

The optimized design meets the targets and the samples are tested.

Snorkel Noise Overall for Optimized Design Vs Design 1 and 2

Low

er

is b

ett

er


14

Results

The optimized design meets the targets and the samples are tested.

Order Snorkel Noise for Optimized Design Vs Design 1 and Design 2

Low

er

is b

ett

er


1600 2600 3600 4600 5600

dB

(A)

Engine Speed (RPM)


Optimized Design Order 2 Target - OREDER 2

1600 2600 3600 4600 5600

dB

(A)

Engine Speed (RPM)


Optimized Design Order 4 Target - ORDER 4

1600 2600 3600 4600 5600

dB

(A)

Engine Speed (RPM)


Optimized Design Order 6

1600 2600 3600 4600 5600

SPL

dB

(A)

Engine Speed (RPM)


Optimized Design Order 8

15

Conclusion

• 1D Simulation results are in good correlation with test results.

• Key factors to reduce the snorkel noise are identified with transmission loss

and snorkel noise results for the existing designs.

• Design optimization approach detailed here provides best possible combination

of air induction system sub components for a chosen engine.

• This effectively reduces time and cost involved in testing several iterations.


Optimization of Air Induction System for Acoustic Performance · Optimization of Air Induction...

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