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  1. onemilimeter

    PolyReference/PolyMAX and Agilent 35670A

    I have an Agilent 35670A. I carried out impact hammer tests and tried to find out the resonance frequencies of a simple structure (http://www.eng-tips.com/viewthread.cfm?qid=253310&page=1). Someone replied that "...no-one uses curve fits to the Nyquist plot any more for modal analysis (because...
  2. onemilimeter

    How to interprete the FRF phase and imaginary plots?

    The following information was extracted from this article: http://macl.caeds.eng.uml.edu/umlspace/oct03.pdf Kindly refer to Fig-1 and Fig-2. As stated in Fig-2: "...This is due to the fact that the magnitude of the FRF of mode 1 and mode 2 is equal at the anti-resonant frequency. But at this...
  3. onemilimeter

    Do with need a sound pressure level meter with a 'ball'?

    When using sound pressure level meter, does it really matter to use it with the 'ball' or without the 'ball' as shown in figure below. Thank you very much
  4. onemilimeter

    Which one is RESONANCE peak?

    I carried out impact hammer test on a motor end cap as shown in Figure 1. The hammer has a built-in force sensor. Hammer hits were repeatedly applied at around 'X' location. The vibration response was measured by an accelerometer (blue). The output of the hammer force sensor and the output of...
  5. onemilimeter

    Is it TRICKY to measure armature winding resistance?

    I've a brushed DC shunt wound machine with the following specs: Rated Speed: 3000rpm Rated Power: 0.25kW Armature Voltage: 180V Armature Current (full load): 1.6A Field Voltage: 210V Field Current (full load): 0.2A I did some calculation as follows: w = n*2*pi/60 = 3000*2*pi/60 = 314.1593 rad/s...
  6. onemilimeter

    Can I perform this with Agilent 35670A?

    I'm aware that there is a relationship between the time-record length, frequency span, frequency resolution, and number of lines as shown in Figure 1 and Figure 2. I did a test using dual channels with the following settings: Frequency Span = 3.2kHz Number of Lines = 1600 lines Time-Record...
  7. onemilimeter

    What is the unit of power spectrum for a voltage signal?

    I've an Agilent 35670A Dynamic Signal Analyzer. A signal is attached to Channel-1. The unit of the signal measured by the analyzer is as follows: Time Capture (time domain): Volt (V) Linear Spectrum (frequency domain): Volt-RMS (Vrms) Power Spectrum (frequency domain): Volt-RMS (Vrms) However...
  8. onemilimeter

    Is "performing Impact Hammer test" an ART?

    I've been doing Impact Hammer test on a motor end cap (just the end cap alone, i.e. the end cap is not attached to the motor frame) for several days. However, I'm still not able to get consistent results, let alone to determine the natural frequency of the end cap. Is performing Impact Hammer...
  9. onemilimeter

    PM brushed DC motor without cogging torque?

    I'm aware that permanent magnet (PM) machine exhibits cogging torque. I'm looking for PM brushed DC motor without cogging torque. Is it possible? If you know any company that sells this type of PM brushed DC motor, please kindly let me know. By the way, how smooth is the electromagnetic torque...
  10. onemilimeter

    How to identify "mechanically" induced vibration and acoustics noise?

    Hi, My background is in electrical engineering. I wish to analyse the vibro-acoustics of a 3-phase permanent magnet brushless machine. I'm aware that vibration or acoustics noise can be generated "electromagnetically" (due to MMF, airgap field, etc) or/and "mechanically" (e.g. misalignment...
  11. onemilimeter

    Which flexible coupling is better?

    I wish to measure the vibration of a motor which is connected (via flexible coupling) to a DC generator as load. I found two types of flexible coupling as shown in attached image. Which one is better for this application (to minimize the vibration due to mis-alignment)? Thanks
  12. onemilimeter

    Can't view TUTORIAL...

    I'm new to Solid Edge (SE). I have SE v19 installed in my computer (Windows XP). Unfortunately, I could not view the tutorial because there is no "Next" button at the top of the tutorial window as shown in attached image...

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