SCIEMETRIC SOLUTIONS
SCIEMETRIC SOLUTIONS Rotary Torque Testing: Using Signature Analysis Highlights: • • •
All test data is saved to disk by engine serial number for 100% traceability Sciemetric’s Signature Analysis System monitors all predetermined torque profiles PLC communication via Allen-Bradley Data Highway Plus™ and Modicon Modbus Plus™
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Easy to use menuing and full graphic displays Signature, SPC, reports
Many automotive manufacturers have selected Sciemetric’s Signature Analysis systems to monitor freerunning torque. Sciemetric’s Signature Analysis System monitors the torque profiles of the engine and compares them with pre-determined “good” waveforms. If any of these waveforms fall outside these limits, the engine will be failed.
Free-running torque is measured at most stations equipped with a rotary torque transducer. The shape and characteristics of free running torque waveforms will depend on the state of the engine assembly (e.g. crank with bearings only should be a relatively flat line, while torque with the engine under full compression will be sinusoidal and will exhibit much higher torque values). The Signature Analysis System captures one or two complete revolutions of torque data, sampling a value each mechanical degree. When the heads and timing chains are attached to the block, two revolutions are required to obtain one complete engine cycle. Running Torque Curve of Crankshaft
InspeXion® Screens showing PASS/FAIL Signature Waveforms produced by Free Running Torque and Vibration (Acceleration) Test
www.sciemetric.com email: [email protected] Tel: 1-877-931-9200 in North America; Visit or website for International contact info © 2003 Sciemetric Instruments, Inc. All brand and product names are trademarks or registered trademarks of their respective companies. Rev. 1. August 2007
AN124
All test data is saved to disk by engine serial number for 100% traceability Sciemetric’s Signature Analysis System monitors all predetermined torque profiles PLC communication via Allen-Bradley Data Highway Plus™ and Modicon Modbus Plus™
• •
Easy to use menuing and full graphic displays Signature, SPC, reports
Many automotive manufacturers have selected Sciemetric’s Signature Analysis systems to monitor freerunning torque. Sciemetric’s Signature Analysis System monitors the torque profiles of the engine and compares them with pre-determined “good” waveforms. If any of these waveforms fall outside these limits, the engine will be failed.
Free-running torque is measured at most stations equipped with a rotary torque transducer. The shape and characteristics of free running torque waveforms will depend on the state of the engine assembly (e.g. crank with bearings only should be a relatively flat line, while torque with the engine under full compression will be sinusoidal and will exhibit much higher torque values). The Signature Analysis System captures one or two complete revolutions of torque data, sampling a value each mechanical degree. When the heads and timing chains are attached to the block, two revolutions are required to obtain one complete engine cycle. Running Torque Curve of Crankshaft
InspeXion® Screens showing PASS/FAIL Signature Waveforms produced by Free Running Torque and Vibration (Acceleration) Test
www.sciemetric.com email: [email protected] Tel: 1-877-931-9200 in North America; Visit or website for International contact info © 2003 Sciemetric Instruments, Inc. All brand and product names are trademarks or registered trademarks of their respective companies. Rev. 1. August 2007
AN124
