Improving eDrive manufacturing quality, integrated NVH and torque EoL testing

Hottinger Brüel & Kjær (HBK) is advancing end-of-line (EoL) testing methodologies by integrating NVH analysis with high-precision torque measurement, enabling a more comprehensive evaluation of electric powertrain performance under production conditions.

In modern eDrive manufacturing, EoL NVH testing represents a critical quality gate, ensuring that each unit meets stringent acoustic, vibrational, and functional requirements prior to shipment. As electrified powertrains inherently amplify sensitivity to noise and vibration—due to the absence of masking effects typical of internal combustion engines—high-resolution diagnostic capabilities at this stage have become essential.

HBK’s Discom NVH production testing system has been specifically engineered to address these challenges, delivering automated, high-throughput testing with robust pass/fail classification. The system detects anomalies in acoustic emissions, structural vibrations, and operational behavior, allowing manufacturers to identify defects such as gear meshing irregularities, rotor imbalance, or bearing faults early in the production cycle.

The recent integration of the T40Lite torque transducer into the Discom platform marks a significant enhancement in EoL diagnostics. By synchronizing torque and rotational speed measurements with NVH data streams, the system enables a multidimensional assessment of drivetrain performance. This approach provides deeper insight into electromechanical interactions, facilitating the identification of issues such as shaft misalignment, frictional losses, and component wear that may not be detectable through NVH analysis alone.

From a system architecture perspective, the combined solution consolidates sensors, front-end acquisition hardware, industrial PC racks, and advanced analysis software within a unified framework. The inclusion of a Big Data and AI interface further supports predictive analytics and continuous process optimization, aligning with Industry 4.0 manufacturing paradigms.

The platform is designed to support 100% inline testing across a wide range of components, including electric drives, transmissions, gearboxes, actuators, turbochargers, and rolling-element bearings. Its ability to deliver repeatable and reliable measurements under real production constraints ensures both scalability and consistency, which are critical for high-volume manufacturing environments.

By merging torque metrology with NVH testing in a single setup, HBK enables manufacturers to transition from isolated parameter checks to a holistic evaluation of system behavior. This integrated approach not only improves defect detection rates at EoL but also reduces the risk of downstream failures, warranty claims, and costly recalls.

As electrification continues to redefine powertrain architectures, solutions that enhance diagnostic depth while maintaining production efficiency will play a central role in safeguarding product quality and accelerating innovation cycles.