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  • Users: WIM32
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  1. WIM32

    Moving to the US

    Hi all, I've been asked by my current employer to start up a branch office in the US. Our (potential) customers are based all over the place, the East-coast (Virginia to NY), Texas, Arizona and Oregon. We still need to define where our HQ will be, and this will also affect my future living...
  2. WIM32

    Pre-tension rebar codes?

    Hi all, I have a question wrt a code combination that I've found on an old report (the company that wrote the report no longer exits) about a hollow slab (1.2x4.8x0.2 meters). It states the following codes which refer to a allowable moment: 0.4.0.0. 48.26 kNm 0.5.0.0. 54.43 kNm...
  3. WIM32

    Wind turbine towers

    I have a question regarding the height of wind turbine towers. As I understand, the bigger turbines (1-2.5MW) currently operate (in Europe) at around 70-100 meters. Now I've read somewhere that at a higher operating height, the wind speed, thus the operating power, is greater. The problem is to...
  4. WIM32

    Transporting measurement devices

    Hello all, I have a non-technical question, but since there is much experience with measurement equipment available in the forum, maybe you can help me out. Our engineers travel around the world with measurement equipment (analyser, sensors and impact hammer). Since we do not have over-capacity...
  5. WIM32

    Modal analysis software

    Hi, I'm looking for a good software package, suitable for modal analysis. We currently use Iotech wavebooks (8 ch) and PCB ICP sensors. Signal analysis is done with Dasylab. Any advice? thanks Wim
  6. WIM32

    Creep of concrete

    Has anybody here experience with creep of concrete? I'm investigating this behaviour in terms of microns. Any book or reference would also be helpful. thnx
  7. WIM32

    Creep question...

    I'm investigating creep of epoxy and I've found some formulas and we're currently doing some tests. From the formulas (and also from the prelimenary test results) it seems that creep never ends... But it must end at some point I guess. Is there anybody with experience in this field?? Thnx Wim
  8. WIM32

    creep test of epoxy

    Does anybody here has experience with a creep test for epoxy type material, or maybe a source were values may be found? thnks Wim
  9. WIM32

    Damping properties of materials

    I've been looking for documentation on damping properties of materials, non-dependend on the dimensions and construction. Until now it seems that damping ratio is not a material property or constant (like Youngsmodulus). Is there anybody who can shed some light on this subject??? There are many...
  10. WIM32

    KYOWA transducers

    Hi, Currently I am using PCB ICP accelerometers. Our data-acquisition and signal conditioning system is a daq/wave book of Iotech. We are looking to buy some extra general purpose transducers; I will meet with a sales-person of Kyowa (electronic instruments) shortly, and I want to know if...
  11. WIM32

    Conversion peak-hold to mean value?

    Is there a theoretically correct (or statistically) way to convert (afterwards) peak-hold values into mean (average) value? I would think this is impossible, since data is being averaged and therefore reduced. Many thanks Wim
  12. WIM32

    Battery powered measurement

    Is there a commercially available solution for a battery powered measurement that lasts about 5 days (5x24hrs). Measurement setup: 6 channels 6 accelerometers 1 data acquisition system 1 data storage (for 5x24hrs) all this should be continueus, batterypowered. All help is welcome rgrds Wim
  13. WIM32

    vibration course

    Hello all, I'm looking for a vibration course, that handles the general topics of vibration data-acquisition, signal analysis etc. The course should be given in Europe, preferably in the Netherlands. Tips on courses in other continents / countries are also welcome. Thanks in advance wim32
  14. WIM32

    Signal analysis

    I'm using an PCB accelerometer with ICP (built in electronics) to measure vibrations. I'm using a PC-based data-acquisition system make Iotech. When displaying the measured amplitude spectrum, peaks at 5, 10, 15 Hz and so forth can be seen. When repeating the measurement, the peaks get less...
  15. WIM32

    I have a structure which has a floo

    I have a structure which has a floor load capability of 1500 kg/m^2. On the ground, there are columns at about 4.8 meter apart. On these columns there is a floor with holes, and on this floor there are "inverted T" structures placed, they have steel strengthening and are approx. 20 cm...
  16. WIM32

    Power spectral density

    To compare measured vibrations with machine specifications, I need to convert acceleration-time signal in to power spectral density. I have FFT equipment available, but I have come up with different definition for PSD. Please help with a correct definition of PSD... Thanks in advance Wim
  17. WIM32

    cost of steel fiber reinforced concrete

    For cost estimation reasons, I would like to know the cost per kg (or m^3) of steel fiber reinforced concrete. The fiber density needed is approx. 60 (or more) kg/m^3. <br> Thanks<br> Wim

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