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Hi All, I have searched the forum to see if i would get an answer to my question to no avail. I am therefore posting the question here: Would it be possible to use a dry screw compressor that compresses air from atmospheric to 3.5 bar(a) for compressing nitrogen and get the same compression...

Dear all, I wanted to find out if structurally, there is a rule for finding out if a given support or frame can support a given machine? We have a current frame that supports a single machine but we need to connect or build an additional machine on top of this first machine and to support it...

Hello All, Anyone with experience on how to design two rotors screw compressors? I would be grateful for any citation on a good literature source (book, paper, etc) on how to go about this. Thanks! Jimmy

Dear All, I am at a stage where i am trying to modify the torsional model i developed for free vibration to one for forced vibration. To do this we have measured the motor torque signal on the motor shaft at a critical speed of 1229 rpm. Our first torsional mode (20.5 Hz=1X input speed) is...

Hello All, I have done free torsional analysis that i now want to extend to the case when there is some forcing. Our electric motor is driving the compressor and this is exciting the compressor at its first mode. I have now been able to get a time series data of the motor torque that is of the...

Hello All, I am relatively new to screw and lobe compressors and I am looking for good literature on how i can determine the pv plot of such compressors analytically. Any suggestions would be much appreciated. Thanks! Jimmy

Hello Everyone, Is there a way in mathcad to obtain the roots of a function f(omega)=0? I am doing it at the moment by first plotting the function and then searching for the places where it is equal to zero. But how do i solve the function directly without first plotting it? Thanks! Jimmy

Hello All, I am new to Mathcad and when i try plotting certain functions, it is not working. The graphing area is red and the following message is what I am getting: "All evaluations resulted in either an error or a complex results". I want to see the zeros of the function in the plot. In one...

Hello All, I am trying to set up a torsional model for a drive train. In the attached picture i am stock at the area that i have circled in red. How do i account for Nodes 10, 11, 12, 15 and 16 in this model? Can setting up an equivalent system with the loads at the nodes be done for such a...

Hello All, I have a general question about whether the distance between the input shaft and the rotors of a screw compressor is important? The axis of the input shaft of our machine is parallel to the axes of the rotors of the lobe compressor and in between are the first stage and the second...

Hello All, I have a general question about whether the distance between the input shaft and the rotors of a screw compressor is important? The axis of the input shaft of our machine is parallel to the axes of the rotors of the lobe compressor and in between are the first stage and the second...

Hi All, I know most of you have years of experience in industry. I am looking for good citations (Books) on vibration, pumps (+ve displacement mainly) and compressors. We are looking at acquiring some for our group. Thanks!

Hello All, We are having a screw compressor that has 3 male lobes and 5 female flutes that runs on a 90kW, 4 pole, 50 Hz motor with synchronization speed of 1480 rpm. However, at a speed of 1350 rpm, we are experiencing a resonance frequency of 22 Hz. We are unable to pin point the source of...

Hi All, I am new to srew compressors and was wondering how to compute the excitation frequency for such a compressor at a speed of 1350 rpm with 3 male lobes and 5 female flutes? Thanks in advace for your help. Jimmy

Hello All, I have done an FEM simulation and have this question. Is there a way you can know that your solution (Stress analysis or modal analysis) is mesh independent? I have varied the mesh resolution and each time i am getting a variation mostly in the first and second mode frequencies. The...

Hello All, I have done an FEM simulation and have this question. Is there a way you can know that your solution (Stress analysis or modal analysis) is mesh independent? I have varied the mesh resolution and each time i am getting a variation mostly in the first and second mode frequencies. The...

Hi All, I have done modal analysis in ANSYS STRUCTURAL and INVENTOR FEM and i also did static analysis using both softwares and compared the results with that from ANSYS CLASSIC. I have one problem with the Modal deformation i am getting from ANSYS STRUCTURAL. The values are very different from...

Hello Everyone, I have a model that i want to setup in ANSYS Structural. The question is can i define different materials in the same model? I think it should be possible, but i am not sure about how it can be done. Any help would be appreciated. Thanks! Jimmy

Hello Everyone, I have a model that i want to setup in ANSYS Structural. The question is can i define different materials in the same model? I think it should be possible, but i am not sure about how it can be done. Any help would be appreciated. Thanks! Jimmy

Hi All, Any citation or info on how i get the impedance of a circular rubber tube? I am doing CFD of a valve that is connected to this tube. The tube cannot be simulated and so i need to impose the impedance of this tube as a boundary condition at the valve outlet. Any help would be appreciated...