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Figure 5.27 Campbell Diagram for Blade TR

5.8.6 Response to stochastic loads

The analysis of stochastic loads in the frequency domain has already been described in Section 5.7.5 for a rigid blade, and this will now be extended to cover the dynamic response of the different vibration modes of a flexible blade using the governing equation, Equation (5.70). Note that the restriction to an unstalled blade operating at a relatively high tip speed ratio still applies.

Power spectrum of generalized blade loading

The generalized fluctuating load with respect to the ith mode is Q; = J^ Ai(r)q(r) dr, where

2 da

Hence

An expression for the standard deviation of Qi, a , can be derived by a method analagous to that given in Section A5.4 of the Appendix for a non-rotating blade, yielding

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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