Electromechanical Actuator NVH Testing With Sinusoidal Torque Excitation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicles lack effective means to diagnose and identify the causes of noise, vibration, and harshness (NVH) phenomena in electromechanical actuator systems, particularly after manufacturing, as these issues often arise from complex interactions within active suspension systems and are difficult to diagnose in service environments.
Innovation Solution
A diagnostic apparatus generates a sinusoidal torque demand signal to excite NVH characteristics, records the response, and compares it to an expected profile to identify fault types, ensuring safety preconditions are met, and attributes frequencies to specific fault types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a diagnostic apparatus is introduced to test NVH characteristics, then the ability to identify and diagnose NVH issues is improved, but the device complexity increases
Solution Approach 1:
The diagnostic apparatus integrates multiple functions including signal generation, data acquisition, signal processing, and fault diagnosis into a single system. The controller can generate various test signals (sinusoidal, random, impulse), process multiple sensor inputs simultaneously, and perform different types of analysis (frequency domain, time domain), making it a universal diagnostic tool for NVH characterization.
Solution Approach 2:
The diagnostic apparatus acts as an intermediary between the vehicle's electromechanical actuator system and the analysis tools. It includes signal conditioners, analog-to-digital converters, and processing units that mediate between the physical NVH signals from sensors and the digital analysis algorithms, enabling accurate measurement and diagnosis without requiring direct connection between sensors and analysis software.
2Reliability
If safety preconditions are verified before testing, then system safety is improved, but the testing time increases
Solution Approach 1:
The diagnostic apparatus performs safety precondition verification before initiating NVH tests. This includes checking that the vehicle is in a safe state, verifying sensor functionality, ensuring actuator systems are operational, and confirming proper signal connections. By performing these checks preliminarily, the system ensures safety while allowing the actual NVH testing to proceed efficiently without interruptions.
Data Source
AI summary
A diagnostic apparatus (100) is disclosed for use in testing an electromechanical actuator system of a vehicle (500). The diagnostic apparatus comprising one or more controllers (110) and is configured to: generate a torque demand signal (155) corresponding to a sinusoidal torque demand profile (310), the sinusoidal torque demand profile configured to cause excitation of noise, vibration and harshness, NVH, characteristics of the vehicle (402); transmit the torque demand signal to the electromechanical actuator system of the vehicle (404); record a NVH characteristic of the vehicle generated in response to application of the torque demand signal (406); and output the recorded NVH characteristic of the vehicle (408).