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  1. VibrationSpecialist

    Balancing Program PC Based

    Thanks all for your reponses, I am looking for a Multi plane, multi-runs, multi-speed program.
  2. VibrationSpecialist

    Motor Failure Pictures

    Can any one povide me with motor failure pictures. Failures such as broken rotor bars, etc...
  3. VibrationSpecialist

    Balancing Program PC Based

    Can any provide me with PC Based Balancing Program.
  4. VibrationSpecialist

    Design Guidline for Block Type Foundation

    Please direct me if you have technical papers, design guidelines and special software that handles design/analysis of block-type foundations supporting heavy vibrating machinery.
  5. VibrationSpecialist

    CSI Ultraspec 8000 firmware problems

    Dear leba, You need to check your setting. Please post your setting and the transducer type to give you more specific answers.
  6. VibrationSpecialist

    Failure of turbine blades

    Dear Mechanical Engineer, What is the failure type? What is the operating scenario in terms of turn around? What is the piping lay out? Any differences? These are just questions that you may start find reasons through the course of investigation. Take Care :-)
  7. VibrationSpecialist

    How do I determine cost savings?

    Dear Pavel2; You can request Maintenance Planner to extract previous history file and list all cost applied. If you do not have this privilege, estimate the down time in hours and labor time and contact the contract department to give your hourly rating and then add this to the bearing changes...
  8. VibrationSpecialist

    FFT analysis

    Dear Azimuddin, *) Your vibration measurement is in mm/s which means that your out put parameter is velocity. Now if you are using an accelerometer to have this high frequency range (10-10,000 Hz), you need to integrate your acceleration signal to velocity. Now you need to check the type of...
  9. VibrationSpecialist

    Dual-input, one output planetary gear.

    Dear izor, Can you please post the dimension and your calculation? Take Care :-).
  10. VibrationSpecialist

    UNDERSTANDING DIFFERENCE BETWEEN HEAVY SPOT AND HIGH SPOT IN DYNAMIC B

    Dear Consultant, The Heavy Spot is the angular location of the imbalance (unbalance) vector at a specific lateral location on the shaft or the rotating element. The High Spot is the angular location on the shaft or the rotating element directly under the vibration sensor at that point in time...
  11. VibrationSpecialist

    balance weight effect

    Dear cyw, I am sure that butelja response was beneficial. In the case of the unavailability of a computerized balancing machine, you need to see the response after the first trial weight. A good response is considered when you have 10-20 % change either in the amplitude or the phase angle. If...
  12. VibrationSpecialist

    Constant Displacement v. Grms

    Dear mbrett, You can derive the acceleration in G as a function of the frequency in Hz giving the displacement either in mils or mm. Are you referring to Grms or G's RMS? In the first it is as stated be Tom is for random vibration (PSD) while the other is the RMS of the acceleration in G's/...
  13. VibrationSpecialist

    Transfer Function

    Dear SCHMIDT, The Transfer function is not limited to relate Acceleration and Force. For example, you can relate force to velocity or force to displacement. When you want to relate two signals that are of the same parameter then you should be after the amplitude ratio, the phase relation and...
  14. VibrationSpecialist

    Power spectral density

    Dear WIM32, The instantaneous magnitude of any random vibration are specified only by probability distribution functions giving the probable fraction of the total time that the magnitude lies within specific range. The Power Spectral Density is really the limiting mean-square value of the random...
  15. VibrationSpecialist

    Vibration Readings.

    Dear Bright_Engineering, You are right that w = 2 * Pi * Frequency (in Hz) Or w = 2 * Pi * rpm/60. Now for your example, you used 30 Hz, which is equivalent to 1800 rpm. Doing the simple calculation then the displacement is 0.002488 in (zero-to-peak) which is equal to 2.488 mils...
  16. VibrationSpecialist

    Power spectral density

    Dear wim32, The Power Spectral Density is simply a method of scaling the frequency of the structure. It is more pronounced for random type of excitation.
  17. VibrationSpecialist

    Tuned Resonant Absorber - Practical Experience

    Dear butelja, I have applied this method for a vertical motor and it worked fine. It has been running for more than three years then the plant was mothballed. The method as you can see is simple. You need to experiment to get the best design that suits your application. Contact me if you need...
  18. VibrationSpecialist

    Digital Sound Recording

    Dear Soap, I agree with buteja in this regard. There are many vendors who supply Digital FFT analyzer that convert Analog input to digital wave form and then you can display your data and select your time frame and post process it. Take Care. ;-)
  19. VibrationSpecialist

    B &K Sound Level Meter

    Dear Joe, When the sound to be measured consists of isolated impulses or contains a high proportion of impact noise, then the normal F (Fast) or S (Slow) responses are not sufficiently short to give the measurement that is representative of the subjective human response. In this case you need to...
  20. VibrationSpecialist

    Building Vibration Code

    I am a vibration engineer. Can any one guide me to any industrial accepted codes or guidelines for building vibration. What are the accepted level of exposure to continuous vibration or the pulse type vibration. VibrationSpecialist

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