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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...

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...

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...

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...

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

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

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

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

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...

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...

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

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

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

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...

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...

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

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