Perfect sound for Electric Vehicles
The electric drives make our vehicles significantly quieter – both for those sitting inside and those passing by outside. This change poses new challenges in terms of acoustics: Noises that had previously been drowned out by the sound of a combustion engine have now become a source of irritation. These kinds of noise can crop up in lots of places on electric vehicles and are mainly produced by auxiliary units and sub-systems. The highest-performance auxiliary unit in an e-vehicle is the air-conditioning compressor, which is built into in the cooling circuit as a vehicle sub-system.
Acoustic Engineering for Vehicle Development
IPETRONIK's acoustic engineering team offers all-round expertise and extensive experience in this field of technology, amassed from a wide range of projects. Their focus is in developing methodology and in supporting the series development of hybrid and e-vehicles.
The IPETRONIK engineering facilities in Eichstätt and in Baden-Baden house a wide selection of test bench resources. These include several acoustic testing chambers large enough for entire vehicles – they can create a conditioned environment of between -20°C and +50°C, can control relative humidity and can simulate solar radiation of up to 1200 W/m2. Units such as the air-conditioning compressor and various other vehicle sub-systems can be built and operated on the relevant test benches.
NVH measurements on HVAC compressor systems
Our Service Portfolio
- Climate Acoustic Chamber for complete Vehicle
- Evaluation of Sources and Transfer Paths
- Unit and component acoustics
- Ventilation Acoustics
- Acoustic Chamber with 350 kW Charging Column
- Development Partnership
- Benchmarking
- Concepts for mounting and decoupling of Auxiliary Units
- Acoustic Simulation
Key Development Methodologies
- Consistent concept of sensors, measurement and analysis technology at the relevant interfaces regarding vibration, dynamic force, gas pulsation or airborne noise as well as hardware modules, data loggers and software
- Authentic operating concept at component level analogous to typical vehicle operation
- Close comparison of actual status, development goals and specification values
- Combination of design (CAD), simulation (structural and gas dynamics, airborne sound radiation) and testing
Acoustic chamber with HV Charging Column
- Integrated 350 kW DC charging column for vehicle testing (Baden-Baden location)
- Measurement/display of standard charging processes (AC up to 22 kW) and higher power classes
- Measurement documentation of the charging processes with regard to all relevant parameters
- Quantification of charging power influence on the external noise emitted by the vehicle
Comprehensive NVH Testing
The resources available at IPETRONIK's Baden-Baden facility for the NVH test of the fast charge facilitate comprehensive evaluation and optimisation of development agents with regard to hardware and operating strategy.
Alongside the general NVH development methods, such as the multi-channel data acquisition for identifying impulses and transmission paths, IPETRONIK has established other specialist processes. These include psychoacoustic evaluation, the blind test with test subjects and other methods, such as locating the source of a noise using acoustic cameras (GFAI) or laser vibrometry (Polytec).
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