Recent content by magnusrm

Hi guys. Im working on a project where we need to estimate vertical flow in a wide vertical tube caused by a stream of air bubbles released at the bottom. I have Solidworks Flow, but this is as far as i understand not suitable for this kind of calculation. Do you have any tips to the easiest...

Hi guys. I wonder if you have any idea if standard NBR70 rubber will stiffen significantly under high isostatic pressures? The rubber in question is used on a ultra deep water ROV, which operates at 6000m depth. We are wondering if the rubber changes properties when the pressure is about 60MPa?

Hi. Im looking at a deep sea underwater camera housing, with a conical acrylic window. At first I thought I would go for place the O-ring grooves on the conical part of the contact face(A), as this would lead to a tight fit, and minimum extrusion risk. I was worried about the contact...

Thanks for your replies, guys. Well, it doesnt need to be planetary, but it will ease the design and manufacturing process if the output shaft is coaxial to the motor shaft. Also, in my head, a planetary gearbox is more compact due to multiple gears transferring the torque. I would also prefer...

Hi, im designing a motor which needs a planetary gear with low ratio, 1:2 is ideal, but due to the principle of ( ratio ) = (sun teeth + ring teeth)/(sun teeth) thats not possible. The motor has an output torque of 85Nm and max speed of 4000 rpm. I havent found any solutions or manufacturers who...

Thank you very much, Ed.

Hi. Im making a electric thruster for underwater applications (sea water). The propeller axle goes through a radial rubber seal from the internally oil filled casing. Ive previously used super duplex / duplex steel (EN 1.4410 / ASTM UNS S32750, EN 1.4460 / AISI 329 or EN 1.4462). The 316 SS...

Hi. Thanks for your reply. You are right, the backiron is just a tiny bit larger than half the tooth (4mm backiron / 7mm tooth). Each tooth will have one pole. The stator will be pressed into a aluminum casing and then molded in by a thermoset polymer after the windings are in place, so it will...

Dosent anyone have some input on the general geometry? Not expecting any analysis, just if it will be ok based on your experience. thanks

Hi guys. Im working on a project to make a new DC underwater thuster where we are making the stator / rotor ourselves. As im a mechanical engineer, this is not my field of expertise and my customer prefers just to try out the mechanical concept before we spend money on el-mag optimizations. As...

I dont have any support as the actuator would have to lift the table starting from this position (even though it would rest when completely stowed). The load on the structure is by my understanding highest (by far) when it is in this position (due to the small angles).

Hi. Thanks for the tips. I see that it would be wise to start with a much more simplified model, but the modelling is done in SolidWorks and I have hoped to save some time by just importing the step files and mesh it with CTETRA. I will try to make a 1D-model as you suggest. Would you do this in...

Hi. I originally though that this high stress came from the mechanism forced the two parts in different directions, but you are right. Those forces should be taken up by the lateral beams and not the constraints. Thanks for the tip!

Hello guys. Im making a scissor lift table and struggle abit with the FEA. I have never tried this kind of coupled mechanism analysis before, so have patience. I have tried several different methods of coupling the two parts trough center holes where it will have an axle / bolt. There is also a...

Hello guys. Im making a scissor lift table and struggle abit with the FEA. I have never tried this kind of coupled mechanism analysis before, so have patience. I have tried several different methods of coupling the two parts trough center holes where it will have an axle / bolt. There is also a...