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How can you use NVH simulation to improve fuel efficiency?

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NVH simulation, or noise, vibration, and harshness simulation, is a powerful tool for automotive engineering. It can help you design and optimize vehicles that are quieter, smoother, and more comfortable for the drivers and passengers. But did you know that NVH simulation can also help you improve fuel efficiency? In this article, you will learn how NVH simulation can reduce fuel consumption and emissions by addressing some common sources of energy loss and inefficiency in vehicles.

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Peter Bobretzky

Privateer

1 Aerodynamic drag

One of the main factors that affect fuel efficiency is aerodynamic drag, or the resistance that the air exerts on the vehicle as it moves. Aerodynamic drag reduces the vehicle's speed and requires more engine power and fuel to overcome it. NVH simulation can help you analyze and reduce aerodynamic drag by modeling the airflow around the vehicle and identifying areas of high pressure and turbulence. By modifying the shape, size, and position of the vehicle components, such as the grille, mirrors, spoilers, and underbody, you can minimize the drag coefficient and improve the aerodynamic performance of the vehicle.

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2 Rolling resistance

Another factor that affects fuel efficiency is rolling resistance, or the friction that the tires generate as they roll on the road. Rolling resistance reduces the vehicle's momentum and requires more engine power and fuel to maintain it. NVH simulation can help you analyze and reduce rolling resistance by modeling the tire-road interaction and the deformation of the tires. By optimizing the tire pressure, tread pattern, material, and geometry, you can lower the rolling resistance coefficient and improve the rolling efficiency of the vehicle.

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3 Engine vibration

A third factor that affects fuel efficiency is engine vibration, or the oscillation of the engine components due to the combustion process and the rotation of the crankshaft. Engine vibration reduces the engine's performance and durability and generates noise and harshness inside the vehicle. NVH simulation can help you analyze and reduce engine vibration by modeling the dynamics and forces of the engine system and the transmission of vibration to the chassis and the body. By optimizing the balance, stiffness, damping, and isolation of the engine components, you can minimize the vibration amplitude and frequency and improve the engine efficiency and reliability of the vehicle.

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Teja Ayyagari

Senior CAE Engineer @ Volvo Group | Structure Simulation
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Not only engine but all other components in the vehicle architecture/packaging should be evaluated with vibrations and frequencies and make sure these doesn’t come under resonance with the engine frequencies. By doing so, you would reduce the stresses on the assemblies which would in-turn provides an opportunity to optimize the mass of the vehicle and hence, improve the vehicle fuel efficiency.

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4 Sound insulation

A fourth factor that affects fuel efficiency is sound insulation, or the material and structure that prevent or reduce the transmission of noise from the outside and the inside of the vehicle. Sound insulation enhances the acoustic comfort and quality of the vehicle, but it also adds weight and volume to the vehicle. NVH simulation can help you analyze and reduce sound insulation by modeling the sound propagation and absorption in the vehicle and the human perception of noise. By optimizing the thickness, density, and placement of the sound insulation material, you can achieve the desired noise level and quality without compromising the weight and space efficiency of the vehicle.

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5 Driving behavior

A fifth factor that affects fuel efficiency is driving behavior, or the way that the driver operates the vehicle in different conditions and scenarios. Driving behavior influences the fuel consumption and emissions of the vehicle by affecting the speed, acceleration, braking, gear shifting, and idling of the vehicle. NVH simulation can help you analyze and improve driving behavior by modeling the driver-vehicle interaction and the feedback that the vehicle provides to the driver. By optimizing the steering, suspension, braking, and transmission systems, you can enhance the handling, stability, and responsiveness of the vehicle and encourage the driver to adopt a more fuel-efficient driving style.

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Peter Bobretzky

Privateer
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The personal feeling of acceleration is based on g-forces, visual impression and sound. With sound engineering one can simulate a more aggressive interior sound during acceleration thus preventing overdosing of fuelling due to missing sound feedback.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Mayur Malaviya

Sr. Vehicle Durability Engineer at Slate | CAE | Testing | Durability| NVH | Data Science
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1. Having optimized unsprung assembly (suspension parts) which meets the static/dynamic stiffness target should be #1 priority. Any savings on unsprung can results into very good fuel efficiency (range). 2. Having optimizing BIW while meeting global/local stiffness and global/local modes should be immediate second. Having a stiff skeleton with the reduced mass is a half battle won already. A special attention is required to optimize all the member sections and moment resistance of each joint. 3. Proper modal map of each mounted subsystem and trimmed part to avoid any unnecessary vibration. In short, if you keep NVH stiffness and modes as a primary driver of your structure design, you are likely to succeed in achieving an efficient vehicle.

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How can you use NVH simulation to improve fuel efficiency?

1

2

3

4

5

6

1 Aerodynamic drag

2 Rolling resistance

3 Engine vibration

4 Sound insulation

5 Driving behavior

6 Here’s what else to consider

Automotive Engineering

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How can you use NVH simulation to improve fuel efficiency?

1

2

3

4

5

6

1 Aerodynamic drag

2 Rolling resistance

3 Engine vibration

4 Sound insulation

5 Driving behavior

6 Here’s what else to consider

Automotive Engineering

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