1 3 1 Testing 02

In-vehicle NVH Testing

1 3 1 Testing 02

Add objectively to your assessments

Customer satisfaction drives the entire passenger vehicle powertrain NVH market and the ultimate verification of a product’s performance is how that product is perceived in-vehicle.

PLATO systems are used in-vehicle to provide objective assessments of NVH and, because the same core software is used that operates with factory-based systems, in-vehicle results can be used to optimise end-of-line assessment metrics and pass/fail boundaries.

Purpose Designed

Purpose-designed hardware

The ABD VP106 is the perfect frontend for PLATO based in-vehicle measurements.

It powers and conditions up four NVH sensors (e.g. microphones, accelerometers) together with a separate RPM (tacho) signal, and it incorporates a National Instruments™ USB-4432 5-channel DAQ-module to link effortlessly to your laptop or tablet PC; providing sampled data with 24-bit precision.

Driver Guidance

Driver guidance and result extraction

Meaningful in-vehicle NVH results came from tests where conditions (i.e. speed and torque loading) have been held consistent.

PLATO’s real-time test conditions view provides test drivers with the ideal tool to make this happen.

Then, with the aid of run-averaging to reduce the effects of inevitable randomness on the results, salient order tracks are effortlessly extracted in real-time during controlled speed sweep (acceleration-deceleration) testing.

Protrusion

Protrusion and audibility

Human perception of powertrain NVH stems from audibility; for example, can the powertrain be heard above background noise arising from tyres, wind and other sounds?

Customer Complaint

Customer complaint

In this example, order 21.25 (corresponding to transaxle final drive fundamental gear mesh order) stands at least 6dB above adjacent background noise. This is audible and a customer complaint.

Big Picture

The 'big picture'

This order track protrusion summary (using the same data as above) shows that final drive gear mesh is well into the audible zone around 2900 RPM.

It also shows that engine firing orders are the most audible components at lower RPM values.

Clear Precise

Clear, precise results

In-vehicle NVH results are reported using PLATO’s intuitive test report and stored within PLATO’s results database (SQL) so they can be passed on to PLATO-SERVER, when the laptop/tablet PC networks are connected back at base.