No contact balancing and diagnostics system for vehicles EEJA - Schenck in Thailand
Vibration measurement at the vehicle
No contact measurement method using laser technology
Vibro-acoustic diagnostics
Evaluation of the unbalance of the drive train
Evaluation of the unbalance calculation
Possible to retrofit into roll test beds
Measuring principle design
The measurement uses the principle of non-contact vibration recording, using a laser vibrometer. Additionally, a speed or angle measurement is carried out by scanning a reference mark on a rotating part, e.g. the cardan shaft. Contactless measurement by laser allows vibrations to be recorded in parallel to other test procedures without any prior adjustment of the measurement sensors on the vehicle. The laser measurement head is mounted on an X-Y table on the rolling test bed, allowing different measurement positions to be accessed. By measuring the vehicle position, the measuring head follows the sideways movements of the vehicle. The connection to the rolling test bed controller enables the integration of the measurement procedure.
Design
Range of application
The system is conceived for vibration measurement in completed vehicles during the EOL tests in the rolling test bed. The aim is to identify vibrations that ate caused through unbalances and errors in assembly. Integration into the rolling test bed is typically done in the area between the rollers for either the front or the rear axel. This allows you to achieve measurement points on the drive train in the are of the rear axel or the gearbox. Both a complete frequency analysis of the vibration signal and the unbalance of the drive train for example, can be determined through the speed-related measurement data recording and evaluation, which is usually done using the speed of a drive shaft. The system determines the required compensation for the unbalance, which can be achieved using a wide range of methods, e.g. the application of weights to the flange between the cardan shaft and the differential.
Technical data
Technical data at a glance
EEJA
Equipment under test
Personal-vehicle on chassis dynamometer test bench
Method of test
Measurement of vibrations and unbalance
Unbalance correction
Mainly attaching of weights in the flange, between cardan shaft and differencial-drive
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