wind turbine blade balancing or just genral balancing a spin rotor.?

Question

i know that the best way to balance a turbine blade is to set it at equal angle to each other. for example 2 blade turbine will be 180 degree to each other, 3 blade will be 120 degree to each other.

but is there any equation to prove that?

Answer 1

How to Balance Wind Turbine Blades

Wind turbine blade balancing is actually a very simple process, but you must do it on a totally still day (i.e. no wind) or do it indoors. Pieces of lead flashing (used by roofers) work best as they are soft (easy to screw in place) and very dense. It can be obtained in flat sheets from a builder's merchant or you can use fishing weights can be hammered flat. Fix the blades onto the alternator in what you intend to be their final positions numbering each blade and the alternator accordingly so that you can take everything apart and put it back together again correctly in future.



Now gently spin the turbine and leave it too come to a complete stop. Whichever side is the heavier will finish at the bottom (6 o'clock position). Raise the heavy side up to the 3 o'clock position and add a weight on or near the hub at the 9 o'clock position (and more weights if necessary) until it balances - i.e. the weight(s) remain at the 9 o'clock position with the previous heavy side at the 3 o'clock. Gently spin the turbine a few more times. If it stops at the same point each time, then that is the new 'heavy side' and you need to repeat the steps listed above. Very quickly you will have a balanced wind turbine and you will not need to re-balance it again unless you replace a damaged turbine blade in the future.

Answer 2

gatorbait has given a very comprehensive answer for how to do static balancing.While important that's only the 1st part of what would be required to completely balance a wind turbine. Once a static balance has been obtained a dynamic balance should really be performed. This is because even though a rotating object is in static balance (ie it wont rotate under gravity after being rotated to any angle) there are situations where the device can produce vibration when it's rotating. Simplest situation is consider a thick disk that's in perfect balance, then to one side add a mass on a given radius , and then add an identical mass at the same radius but on the other side of the disk. That static balance should remain unaltered, but a kind of bending vibration will be produced when the disk rotates



Way it's dealt with is to detect where the principle axis of inertia lies, and "move it" to coincide with axis of rotation by careful choice of the location of weights (or removal of material)

Answer 3

they don't bypass at 60Hz. that would desire to be 60 revs in step with 2nd. proper turbine blade velocity is ruled with the aid of the fee of the blade tip. you mostly want the best ratio of tip velocity to wind velocity for optimum capability capture. till those days, maximum wind generators would desire to basically bypass at one velocity, so which you picked the top velocity that replace into best on your envisioned wind velocity, and then desperate how long the blade replace into, and that advised you procedures quickly it would spin. The longer the blade, the slower the rotation cost. then you definitely want a gearbox to get to mains frequency interior the alternator (50Hz or 60Hz, reckoning on which area of the pond you're) in recent times maximum wind generators are variable velocity so they alter their rotation velocity to the windspeed to improve the capability capture - they bypass slower at low windspeeds. they are additionally getting bigger, which skill they might desire to certainly decrease the rotation cost interior the layout. That comes out at something around 15 revs in step with minute. you additionally can decrease the rotation cost with the aid of having greater blades - yet there are engineering problems with that. incredibly, the little bit of wind generators it somewhat is maximum in all probability to fail is the gearbox. the better the gearbox ratio, the greater cases you will would desire to nurse it. So ideally you want the quickest rotor velocity - and which skill the smallest style of blades. A unmarried bladed device is exceptionally much impossible to stability (regardless of the undeniable fact that an italian company did manufacture one for a at an analogous time as) and a twin bladed device continues to be very problematical to stability (and twin blades spook human beings for some reason). that's why 3 blades is now commonplace - the so-mentioned as "Danish kind". and finally: I have been given a letter from the RSPB some years in the past helping actual a proposed wind turbine. the clarification? international warming will kill one heck of lots greater birds than some generators (which the birds can see!).