faisalv8
Aerospace
- Sep 9, 2018
- 1
Dear all,
I am currently working to design a test-pod for 3U cubesats. One of the aspects I am trying to address is the random vibration simulation in ANSYS. The thing is that based on the random vibration profile suggested by QB50, I define the excitation in ANSYS, and get sometimes as high as 70G as g_RMS. Whereas, I conducted a test on 2U cubesat with 2U Test-POD, and the g_RMS came out to be 14g. Surely adding 1U of length to a structure cannot make g_RMS jump from 14g to 70g.
So what I figured out is that the random vibration in ANSYS needs damping ratio to be defined. I read somewhere on this forum that 0.05 is a reasonable value to use for this. Is there anything else I might be missing here which can help me get more realistic results, which would be closer to experimental results?
Regards
I am currently working to design a test-pod for 3U cubesats. One of the aspects I am trying to address is the random vibration simulation in ANSYS. The thing is that based on the random vibration profile suggested by QB50, I define the excitation in ANSYS, and get sometimes as high as 70G as g_RMS. Whereas, I conducted a test on 2U cubesat with 2U Test-POD, and the g_RMS came out to be 14g. Surely adding 1U of length to a structure cannot make g_RMS jump from 14g to 70g.
So what I figured out is that the random vibration in ANSYS needs damping ratio to be defined. I read somewhere on this forum that 0.05 is a reasonable value to use for this. Is there anything else I might be missing here which can help me get more realistic results, which would be closer to experimental results?
Regards
