MTM

X, Here is a version of the code I am working on. Take note of the integration blocks with the control inputs of initial, finial, and dt these are the values I don't know how to properly set. For velocity integration, if you set the amplitude to 3.6625 and frequency to 300 your output after integration peak to peak should be 1.500inch/sec and .530RMS. I thought I could get the same value out of Labview as calculated by hand. Thanks for all your info above, M

QUOTE(xavier30 @ Jul 3 2007, 09:06 AM) X, Never thought about it from that angle, I could buffer/save the info, but our field crews like to have real time accelerometer measurements. Any thoughts on how to manipulate dt from the sample rate? Thanks for your help, MTM

QUOTE(xavier30 @ Jul 2 2007, 05:44 PM) I guess my core problem here is knowing how to setup the sampling rates. I don't know if anyone here is familiar with vibration measurements that are taken from an accelerometer. I am going to eventually replace my simulated signal with a DAQ signal. For ideal purposes, I started with the simulated signal source to make sure my integration function(s) are working. The input into my circuit from the accelerometer will be acceleration where I take that signal, integrate it, and that result after integrating one time will become velocity. I then will need to integrate from the velocity signal to displacement. Filtering out any other frequencies under ideal settings is not of concern. How do you know how to setup the proper sampling?? Thanks for the inputs everyone, MTM

QUOTE(xavier30 @ Jun 29 2007, 07:58 PM) xavier30, I have been using the NI_AALPro.lvlib:Integration x(t).vi block to do my integration in the Labview 8.2 enviroment. This is the first phase of a series of cascaded integrators I will need to apply but I need to make sure the first one works so the following series of integrators will also work. The function I need to integrate is A(t) on the interval of upper limit=2*pi and lower limit=0 where A(t)=A*sin(w*t)dt using trapezoidal integration. A in this case is constant, w is omega, and t is time. I'm not sure how the array data is handled within this block. I have been using different sampling numbers to try and get the proper result; however, when I use a high sampling rate my integrator block keeps integrating linearly off into infinity. I am using a simulated signal and believe that at the right frequency and amplitude (ones that I calculated and I know are right) I should be able to match my calculated values, but have not been able to do so. I am new to the labview enviroment so I could be overlooking something simple... Thanks, MTM NI_AALPro.lvlib:Integration x(t).vi NI_AALPro.lvlib:Integration x(t).vi

HI, I need to perform an integration function within my block diagram. Whenever I use a simulated signal to match calculated results, the integration blocks never outputs the proper results I calculated. How can I correct this problem?? I don't want to use scaling parameters because these will not always give me the proper results I am looking for. Mike

Hi, I just started to use Labview 8.2 here in last couple of weeks, and I was wondering if there is a good way to comment out parts of the block diagram you want to keep but not run. Any thoughts?? Regards, Mike