Test Data Processing and Durability Analysis

Feature identification in time series data

The Signal option contains a set of glyphs often used in durability test applications to identify ‘features’ such as spikes, drift, and flat-lines within time series data. Features can be viewed and corrected automatically using other glyphs such as the Graphical Editing glyph. This option also contains a number of glyphs that can be used to describe a measured signal such as additional histograms or relative damage.

Signal Option features:

Calculate fatigue life from measured data  

GlyphWorks provides the industry-leading fatigue analysis technology necessary to calculate fatigue life from measured data. A materials database with commonly used fatigue data is also provided.

With the Fatigue option, you can:

• Correct for mean stress and surface finish effects
• Back calculate from each data channel to determine a scale or fatigue concentration factor required to achieve a target life
• Review damage histograms to determine which load cycles were most damaging
• Output damage time histories to show exactly when the damage occurred

Create accelerated structural tests

Performing durability tests, such as vehicle road simulators, can take many weeks and require huge amounts of time history data. Fatigue Editing is an option used to perform damage sensitive editing to generate shorter time series data that retain the required damage.

With Fatigue Editing you can:

• Shorten multi-axial durability tests while retaining damage to save time and money
• Assess the trade-off between time saved and damage retained across multiple channel

A highly flexible tool, Fatigue Editing uses the powerful Fatigue glyphs enabling the user complete control over the parameters used in the damage calculations.

Find the optimal mix of test tracks to match an overall durability target

Physical durability testing often requires determination of the optimum, most efficient mix of events required to match an overall target. Optimized Testing provides a proven approach to find the optimum solution across many channel locations.

A wide range of inputs from measured data such as rainflow cycle counts or relative damage values enables many industry applications. The optimization methods for best fit least-squares regression and constrained minimization routines employ robust algorithms from IMSL^® Numerical Library.

With Optimized Testing you can:

• Significantly reduce proving ground track usage
• Optimize testing schedules and reduce testing time
• Understand how real world usage compares to track data
• Rapidly compare different proving grounds or duty cycle

GPS mapping of data points

Quickly plot thousands of latitude and longitude GPS data on a map or grid background with GPS Display in GlyphWorks. Data can be also exported for vieweing in Google Maps™ or Google Earth™. Feature lists are also supported, allowing locations of interest on the data lines to be automatically identified and marked. Regions for editing data can be defined based on geographical location.

The GPS Processing glyph enables vehicle performance data to be estimated from low sample rate GPS data. Calculated channels include speed, percent gradient, yaw rate, and lateral acceleration— it can even be used to estimate engine power and braking power.

Interactive ASAM ODS access

The ASAM ODS option enables you to perform a search based on metadata and edit data from your ASAM ODS database within the GlyphWorks interface. ASAM ATF and ATFX files are also supported and can be both imported and exported.