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Estimating rigid body motion from accelerometer measurements

Acceleration data is often collected on vehicle cabs for heavy-duty trucks with accelerometers placed at various locations throughout the cab. The center of mass of the cab is of particular interest as is represents a convenient location for computational models. Additionally, the number of acceleration channels collected may exceed the required six degrees of freedom needed to fully define the equations of motion for the cab center of mass. This presentation details a method utilizing the Moore-Penrose pseudo inverse to find a best fit for the cab center of mass to an over constrained set of acceleration channels. This method may also be extended to find accelerations at other locations on the cab, so long as the rigid body assumption is not violated.

Challenge

Difficult to measure the rigid body motion of vehicle components such as powertrain, cab, cooling module, etc.

Solution

Standard data reduction process using nCode GlyphWorks and the Python scripting glyph

Value

Quantify rigid body motion of vehicle components
Identify fundamental information regarding the performance of suspension systems
Automate processing of road load and vehicle dynamics data

Test data processing and durability analysis

nCode GlyphWorks is a data processing system that contains a powerful set of pre-defined tools for performing durability analysis and other insightful tasks such as digital signal processing. Designed to handle huge amounts of data, GlyphWorks provides a graphical, process-oriented environment that contains leading analysis capabilities for saving both time and money in environmental qualification and product validation.

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Data storage and automated reporting

nCode Automation is a web-based environment for the automated storage, analysis and reporting of engineering data. It is built on robust technology including Java EE to provide a collaborative platform for sharing test data and associated information throughout an organization.

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