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I am not trying to do any accident investigation, I just want to use the data for data analytics. When I import the binary file assuming 12bit word the syncwords are 1027 words apart instead of 1024, I can't figure out why this is happening.

I have an ARINC 717 file in binary format. I know the Syncwords, there are Teledyne format. I have all the parameter addresses both analog and binary. I am using Matlab to open the binary file by specifying that its a 12 bit word. The sync words for each subframe are 4018 words apart, it should...

I would call 3M tech support, they have good adhesives

I am looking for information on Vibration Based Condition Monitoring of CNC machines. What are the most common maintenance issues with CNC machines and which of those can be detected using vibration?

Artisi - Thanks for reminding me of my improper pump selection [smile]. I needed a pump which was separate from the motor and that was the lowest capacity pump available in the market and the demo had to be small. I ran the pump at half the speed, but closing the suction valve is not quite...

"Get a smaller valve or introduce some lengths of smaller diam pipe somewhere." Just so that I understand are you suggesting increasing the length of pipe to increase the discharge head? Can I add couple of elbows to increase the head?

It is a Characteristic Control Valve (CCV)EP050R+MP - https://www.belimo.eu/pdf/e/EP..R_MP_datasheet_en-gb.pdf

It is a broadband noise from 4000-6000Hz. There might be peak at vane pass frequency. I have a way to measure flow, what would that tell me?

I have reduced the discharge pipe dia from 50mm to 32mm and installed a discharge valve and had to close the valve by 80% to reduce cavitation (50mm dia), there is still some vibration in the 4000-6000 Hz range. The discharge valve is an electronic one and it can't be changed now and it is at...

Thanks for all the replies. I am using an accelerometer mounted in horizontal position on the outer casing of the impeller. So I can see the spectrum and it shows up as broadband noise if it cavitates. @littleinch - The pump curve is same as shown in the catalog, running speed is 2900 RPM...

As I understand if I keep the flow below 7 m3/hr by controlling the discharge valve then it would not cavitate. Then if I want to create cavitation, I can just close the inlet valve?

Yes. There is no discharge valve, I will add one. But I thought cavitation occurs on suction side, when pressure is close to zero? There are no bubbles in suction pipe and the suction pressure shows 20 psi with inlet fully open and close to 0 when almost fully closed. Also, Did I create the...

I am trying to create a demo centrifugal pump to show increased vibration from cavitation. I have a pump running at 2900 RPM and a 2 inch suction side pipe and 2 inch discharge pipe with a increaser. The pump is a Kirloskar DB 32/13 End Suction Pump. I can get cavitation by closing the suction...

It is just a modal test to acquire frequencies and mode shapes.

Thanks Dr.Platten and Greg! Regarding "Free free testing with a grounded shaker is slightly tricky" Would it help if I suspended my shaker from a modal excitation stand along with the use of steel stinger?

I am trying to test a beam (132 lbs weight) under free boundary conditions using an electrodynamic shaker (rated 110lbf sine). I connected the shaker, which is attached to two cinder blocks, to the beam using a long nylon stinger and a force transducer. The problem I have is that when I input a...

Strain gages are easy to mount, cheaper, and can be left in place for long term monitoring if they are properly protected. The selection would also depend on what parameters you are trying to measure. If your trying to determine the Dynamic load allowance factor or impact factor (increase in...

I attended the 3 day course on modal analysis at UC but not the structural testing course. That course was a good starting point and now I am trying to get into the details of various modal analysis methods. Thanks for the suggestion.

Thank you Dr. Platten for the code. I wanted to generate this IRF so that I could write a program fof least square complex exponential method and get a feel for it.

Oops! The image of IRF I got from using Dr. Platten's code can be found at http://www.cnuga.com/irf.jpg