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RESS-4-19

RESS-4-19. vibration-test for RESS 1. quantification the load of different vibration profiles with a test specimen 2. proposal for a test-profil. evaluated profils for vibration test. vibration signal of a car on proving ground (example) random vibration ISO12405 vertical 8g-Sweep UN38.3

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RESS-4-19

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  1. RESS-4-19 vibration-test for RESS1. quantification the load of different vibration profiles with a test specimen 2. proposal for a test-profil

  2. evaluated profils for vibration test • vibration signal of a car on proving ground (example) • random vibrationISO12405 vertical • 8g-Sweep UN38.3 • 2g-Sweep proposal approx. 75 Hz approx. 30 Hz approx. 15 Hz strain gage load direction test specimen

  3. sweep-signal • The vibration shall be a sinusoidal waveform with a logarithmic sweep between 7 Hz and 200 Hz and back to 7 Hz traversed in 15 minutes. This cycle shall be repeated 12 times for a total of 3 hours for each of three mutually perpendicular mounting positions of the RESS. • UN38.3 8g-sweep • from 7 Hz to a peak acceleration of 1 gn is maintained until 18 Hz is reached. The amplitude is then maintained at 0.8 mm (1.6 mm total excursion) and the frequency increased until a peak acceleration of 8 gn occurs (approximately 50 Hz). A peak acceleration of 8 gn is then maintained until the frequency is increased to 200 Hz. • Proposal 2g-sweep • from 7 Hz to a peak acceleration of 1 gn is maintained until 18 Hz is reached. The amplitude is then maintained at 0.8 mm (1.6 mm total excursion) and the frequency increased until a peak acceleration of 2 gn occurs (approximately 25 Hz). A peak acceleration of 2 gn is then maintained until the frequency is increased to 200 Hz.

  4. vibrationsignal from proving-ground (example) random vibration ISO12405 vertical 8g-sweep UN38.3 2g-sweep proposal power spectral density (PSD)of test-profils

  5. vibrationsignal from proving-ground (example) random vibration ISO12405 vertical 8g-sweep UN38.3 2g-sweep proposal load of test speciment • max. strain on test specimen max. strain [mV/V] measuring point 15Hz measuring point 30Hz measuring point 75Hz

  6. vibrationsignal from proving-ground (example) random vibration ISO12405 vertical 8g-sweep UN38.3 2g-sweep proposal load of test speciment • fatigue damage on test specimen, relative to vibrationsignal from proving-ground extrapolated to target relative fatigue damage measuring point 15Hz measuring point 30Hz measuring point 75Hz

  7. measured accelerations,power spectral density • range of measured accelerations (vertical) on car body, approx. 50 different cars • micro compact car • luxury sedan • roadster • SUV • … PSD [g²/Hz]

  8. car body - frequency spectrum car body - frequency spectrum micro compact car accelerationy [g] accelerationy [g] frequency [Hz] frequency [Hz] measured accelerationsfrequency spectrum FFT micro compact car • no significant response upwards 50 Hz • highest peaks for micro compact car

  9. RESS vibration test proposal acceleration – frequency curve • maximum acceleration 10m/s^2 (1g), maximum frequency 50 Hz • sinusoidal waveform with a logarithmic sweep

  10. RESS vibration test proposal At the request of the manufacturer, a higher acceleration level as well as a higher maximum frequency can be conducted. In the case of a higher maximum frequency, the lowest frequency can be greater than 5 Hz, but shall not exceed 10% of the highest frequency. At the request of the manufacturer a test profile determined by the vehicle-manufacturer, verified to the vehicle application and agreed by the Technical Service can be used as a substitute of the frequency – acceleration correlation of the proposal.

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