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UN 38.3 Shock Test Data Collection Rich Byczek, Intertek Oct 2013 1

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Presentation on theme: "UN 38.3 Shock Test Data Collection Rich Byczek, Intertek Oct 2013 1"— Presentation transcript:

1 UN 38.3 Shock Test Data Collection Rich Byczek, Intertek Oct

2 T4: Shock Small Cells/Batteries = 150g/6ms = consumer battery specs Large Cells/ Batteries= 50g/11ms = automotive OEM Specs Large Cells -> Small Batteries: Cells at 50G, Battery at 150G

3 Measurement Methods Shipping of Representative shipments and packaging. OEM selected Samples OEM selected Methods Small, Medium, Large sample shipments

4 Measurement Methods INTERTEK RECOMMENDATIONS Pallet (LTL) and Small (UPS, FEDEX, etc) Assume small parcels have the roughest handling. Measure at package, not at device (do not assume dampening)

5 Measurement Methods Measurement Equipment EDR-3C by IST - 3axis internal accelerometer - Use 2 to test both package and battery. - Set minimum G threshold, to collect primarily shock pulse data (i.e. 3G, 5G)

6 Measurement Methods May require multiple runs per shipment size and type. Set realistic thresholds to maximize data collection Potential variation from shipment to shipment Variation based on sample and packages size and method.

7 Measurement Methods Measurement Analysis - Convert recorded data to time history - Cursory review of peaks and durations - Data reduction based on revised threshold - Statistical calculation of Peak G and Duration

8 Measurement Methods Resultant Shock Pulse ASSUMPTIONS Half Sine Pulse Small/ Large have separate parameters Peak G level: based on max for each shipment size, regardless of method Duration: based on average pulse width above threshold Pulse Count: TBD, based on average pulses per shipment

9 Measurement Methods NOTE on PEAK and NUMBER of PULSES: Increasing number of pulses may be a way to reduce test peak levels. Typical 1-3 pulse per direction is an ACCELERATED TEST, and therefore peak G level may not be representative of actual accumulated stress. Alternate is realistic G level, with representative test duration (number of pulses seen in a typical or multiple shipments)

10 Vibration and Shock Test cells and batteries shall be secured to the testing machine by means of a rigid mount Fixturing: Support the product May simulate packaging May simulate mounting in position Not well defined currently. Cannot assume package dampening

11 Vibration and Shock CONSIDER WHAT IS BEING SHIPPED! CONSIDER HOW IT IS SHIPPED! CONSIDER HOW IT IS TRANSPORTED AFTER INITIAL SHIPMENT

12 THANKYOU Mike Wells Vibration Test Department Manager Rich Byczek Intertek Global Technical Lead Electric Vehicle & Energy Storage Rich Byczek Intertek Global Technical Lead Electric Vehicle & Energy Storage


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