Blocked force testing helps engineers understand how vehicle components generate noise and vibration independent of the structure they are mounted to. Siemens introduces AutoCMX (Automated Component Model Extraction), a self-measuring test bench designed to automate this process, which is relevant for electric vehicles where no engine masks unwanted sounds.
It uses fixtures equipped with built-in shakers, force sensors and accelerometers to measure component behaviour without manually repositioning equipment. Applied to an electric power steering system, the system checks measurement quality and validates results before comparing different component variants, including faulty samples. The measured data can be used with vehicle models to predict interior noise and structural vibrations, which were checked against real vehicle measurements. Automated post-processing and centralised data management also aim to simplify data handling and support repeatable NVH analysis. Overall, this approach aims to make component-level noise and vibration assessment more systematic and support informed decisions during vehicle development.
Image generated by: ChatGPT
