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Hi All, We have completed a grind to cleanup damage on a turbogenerator journal shaft. The current surface finish is around 0.4 - 0.6 RA, Could this be too fine for reliable operation? Regards, JT

Hello, I am interested to ask how is the high speed balancing of gas compressors carried out? Does this always require a high speed balancing facility with a vacuum bunker? How often is re-balancing required? What is the typical lead-time and price to complete and how does this compare to...

Thankyou Greg, That is what I am looking for. Determining the co-efficient of lift from the vane geometry is where I come unstuck, I do like my colored diagrams ... Cheers

It is difficult. I would like to ask in general - is the centrifugal load the main source of stress in a part like this? (single part fan hub and blades as pictured). How much of the total stress is due to the actual aerodynamic loads? I would expect once the force due to lift is accounted for...

We do not service fans. But moreso the generator they are attached to. I am looking to get an idea on where the stress concentrations might be. Given the aluminium fans on a particular rotor have undergone excessive corrosion. As a result of this we are worried about potential cracking around...

Might be out of my depth here. Thought there might be a straighforward general formula using just the airfoil shape, angle of the blade, rotational speed. I will have a search. Regards,

Thanks NRP What propriatary data would I require from the OEM? Ballpark pigures is all im after.

Its not the data I am seaching for as much as the method to approximate it. It is not so much for design but for awarness of failure modes in the machines I service.

within 10% error/accuracy? The blade is a cooling fan blade for a turbogenerator. Is there literature you would recommend to estimate this? Regards, JT

Hello, I have a fan hub I am looking to get an idea of the stresses it is under. Is there a way of appoximating the force normal to the surface given: - Air/medium density - Radial velocity - Fanblade geometery Kind regards, JT

Waross, Polorization Index is what I am refering to. Gr8blu, That answers my question regarding the thermal issue. My next question would be; What is the trend betwee the ultimate failure voltage of a insulation system and temperature? So a 15kV stator with class F insulation is suitable to...

Hello, We routinely bake stators during overhauls after completing a steam wash to remove contamination. I am interested in getting a better gauge of time required at temperature in order to ensure all moisture is removed. Completing a PI test intermittently seems to be a logical way to...

Hello, I have a result file in strand 7 showing a quadrant of a axysymmetric part. Is there any way in post processing to copy the quadrant to show the complete part? So i can display this as 1 full ring? Kind regards, JT

Plausible results.

I will investigate. There is clearly significant capabilities that I am not taking advantage of.

I understand. No adjustment for area is required in a pressure input. Thankyou. That is the glaring error.

Yes IDS although I cannot see why the force is so low. only approx 860N total on the Z axis reactions. Is the method i have used to scale the force incorrect? Yes rb1957 it is strand 7.

I am struggling to see the source of my error in this simple simulation I am trying to verify the stresses on a fabrication when a 30 Ton generator is set down on the indicated areas. There are 4 supports assumed to be fully fixed at this stage in the simulation. My calculations so far: - For...

Hi Gr8blu, Is there any obvious difference in design with the rotors where the rings are intended as part of the magnetic circuit as you mention? I would not anticipate a larger ring would be required or any major mechanical changes would be required in using the 18-18 ring - Although I have...

Hi All, What are the risks of replacing carbon steel magnetic retaining rings with non-magnetic 18-18 forged rings? Is there a significant difference in flux generatation ? Are there any possible risks in replacing the rings with the modern standard? 18-18 is the unanymous material of choice...