UL Vibration Testing ApparatusP13471

Walter Bergstrom, Sean Coots, Spencer Crandell, Mark EllisonFaculty Advisor: Dr. Benjamin Varela

Design Specifications•New design must have a total displacement of 1/32” and provide oscillations at 2000 cycles per minute•New design envelope should be equal to or smaller than current design•New design should allow for adjustment of stroke•Must be able to support multiple luminaires with multiple pipe sizes

Design Process•Identify faults with current system•Brainstorm multiple designs with multiple solutions to current faults•Weigh pros and cons of each design to eliminate weakest designs and select final design path•Review design for potential failure areas•Areas of potential failure were analyzed using ANSYS

Final Design•Crankshaft design for rotary to linear motion

• Custom steel crankshaft connecting eccentric pin to linear slider

•Two piece friction locking mechanism for stroke adjustment• Two locking T-blocks• Hand sliding for coarse adjustment• Set screw for fine adjustment

•Linear slider mechanism to ensure linear motion• Contains crankshaft and eccentric pin for safety• Polycarbonate hatches allow for maintenance• Pillow block linear bearings

Background Information•To pass safety requirements for certification the luminaires must meet a series of Underwriters Laboratories Inc. Standards•A Vibration Test Stand is currently being used by Eaton Corporation to test pendant mount luminaires according to section 33 of the UL844 Standard.•The Current Vibration Test Stand is outdated, has multiple design flaws, and design documentation and drawings are non-existent•Cooper Crouse-Hinds would like a new modernized Vibration Test Stand to be developed that addresses some of the design flaws of the current system while maintaining UL844 Test Standards

Conclusions

Acknowledgements•Dr. Stephen Boedo•Dr. Mike Parthum•Ed Leubner•Joe Manahan•Eaton Corporation•Dave Hathaway•Rob Kraynik•Jan Maneti

• The apparatus must meet the proposed deflection requirements of 1/32”

• The apparatus will be tested for force required to bend the NTP pipe that will support the luminaire

• Forces from inertia will not be tested since this portion of the design does not include a motor

• Full testing will occur after Imagine RIT