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Mechanische trillingen

Mechanische trillingen. LES 4 – TRILLINGSOPNEMERS. Patrick Guillaume E-mail: patrick.guillaume@vub.ac.be Tel.: 02/6293566. The Measurement Chain. Displacement, Velocity or Acceleration?. Conversion from Displacement to Acceleration.

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Mechanische trillingen

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  1. Mechanische trillingen LES 4 – TRILLINGSOPNEMERS Patrick Guillaume E-mail: patrick.guillaume@vub.ac.be Tel.: 02/6293566 MECHANISCHE TRILLINGEN, LES 4, 2005

  2. The Measurement Chain MECHANISCHE TRILLINGEN, LES 4, 2005

  3. Displacement, Velocity or Acceleration? MECHANISCHE TRILLINGEN, LES 4, 2005

  4. Conversion from Displacement to Acceleration MECHANISCHE TRILLINGEN, LES 4, 2005

  5. Conversion from Acceleration to Displacement MECHANISCHE TRILLINGEN, LES 4, 2005

  6. Vibration Parameters MECHANISCHE TRILLINGEN, LES 4, 2005

  7. Units of Vibration Signals MECHANISCHE TRILLINGEN, LES 4, 2005

  8. Early Methods of Vibration “Measurements” MECHANISCHE TRILLINGEN, LES 4, 2005

  9. Classification of Motion Transducers • Absolute or relative transducers • Active (self-generating) or passive transducers MECHANISCHE TRILLINGEN, LES 4, 2005

  10. Piezo-electric Accelerometer MECHANISCHE TRILLINGEN, LES 4, 2005

  11. Types of Accelerometers MECHANISCHE TRILLINGEN, LES 4, 2005

  12. Mass-Spring Transducers (Seismic) MECHANISCHE TRILLINGEN, LES 4, 2005

  13. Mass-Spring Transducers (Seismic) MECHANISCHE TRILLINGEN, LES 4, 2005

  14. Mass-Spring Transducers (Seismic) MECHANISCHE TRILLINGEN, LES 4, 2005

  15. Mass-Spring Transducers (Seismic) MECHANISCHE TRILLINGEN, LES 4, 2005

  16. Sensitivity and Frequency Range MECHANISCHE TRILLINGEN, LES 4, 2005

  17. Useful Frequency Range MECHANISCHE TRILLINGEN, LES 4, 2005

  18. Special Accelerometers MECHANISCHE TRILLINGEN, LES 4, 2005

  19. Choosing an Accelerometer MECHANISCHE TRILLINGEN, LES 4, 2005

  20. Properties Output Useful Range Acceleration • Linearity • Dynamic range • Effect of temperature MECHANISCHE TRILLINGEN, LES 4, 2005

  21. Transverse Sensitivity MECHANISCHE TRILLINGEN, LES 4, 2005

  22. The “Mass Loading” Effect MECHANISCHE TRILLINGEN, LES 4, 2005

  23. The “Mass Loading” Effect • MDOF • Geen invloed in een knooppunt van een trillingsmode • Grootste invloed in de buikpunten van een trillingsmode MECHANISCHE TRILLINGEN, LES 4, 2005

  24. Environmental Effects MECHANISCHE TRILLINGEN, LES 4, 2005

  25. Avoiding Errors due to Sensor Resonance MECHANISCHE TRILLINGEN, LES 4, 2005

  26. Choosing the Mounting Position MECHANISCHE TRILLINGEN, LES 4, 2005

  27. Acceleration Mounting - Fixed MECHANISCHE TRILLINGEN, LES 4, 2005

  28. Acceleration Mounting - Handheld MECHANISCHE TRILLINGEN, LES 4, 2005

  29. The Calibration Chart MECHANISCHE TRILLINGEN, LES 4, 2005

  30. Handle the Accelerometer Carefully MECHANISCHE TRILLINGEN, LES 4, 2005

  31. Calibration • In the field • Sensitivity check • Total system check MECHANISCHE TRILLINGEN, LES 4, 2005

  32. Calibration • In the lab (e.g., the “Back-to-Back” method) • Frequency response measurement MECHANISCHE TRILLINGEN, LES 4, 2005

  33. Choice of Preamplifier MECHANISCHE TRILLINGEN, LES 4, 2005

  34. Preamplifier MECHANISCHE TRILLINGEN, LES 4, 2005

  35. Influence of Cables Lange kabels  CKABEL stijgt  ZL daalt MECHANISCHE TRILLINGEN, LES 4, 2005

  36. Preamplifiers On and Inside Accelerometers MECHANISCHE TRILLINGEN, LES 4, 2005

  37. ICP / Charge Mode MECHANISCHE TRILLINGEN, LES 4, 2005

  38. Typical ICP Sensing System MECHANISCHE TRILLINGEN, LES 4, 2005

  39. Single-ended or Floating Input MECHANISCHE TRILLINGEN, LES 4, 2005

  40. Floating Mode E.g., Common Mode Rejection Ratio of 60 dB   = 0.001 MECHANISCHE TRILLINGEN, LES 4, 2005

  41. Single-ended Mode Common Mode Rejection Ratio of 0 dB   = 1 MECHANISCHE TRILLINGEN, LES 4, 2005

  42. Ground Loop Problem and Solution MECHANISCHE TRILLINGEN, LES 4, 2005

  43. Piezoresistieve accelerometer Brug van Wheatstone MECHANISCHE TRILLINGEN, LES 4, 2005

  44. Capacitieve accelerometer MECHANISCHE TRILLINGEN, LES 4, 2005

  45. Velocity Pickup MECHANISCHE TRILLINGEN, LES 4, 2005

  46. Eddy Current Proximity Probes MECHANISCHE TRILLINGEN, LES 4, 2005

  47. Eddy Current MECHANISCHE TRILLINGEN, LES 4, 2005

  48. Calibration Curve • Mechanical run-out • Electrical run-out • Cross-coupling MECHANISCHE TRILLINGEN, LES 4, 2005

  49. Operational Range of Vibration Transducers MECHANISCHE TRILLINGEN, LES 4, 2005

  50. Absolute verplaatsingsopnemers (assen) Contactsonde Gecombineerde sonde MECHANISCHE TRILLINGEN, LES 4, 2005

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