Limitation of large excursions

Some limitation on teeter excursions has to be provided, if only to prevent collision between the blade and the tower. If the teeter hinge is located close to the axis of the blades, with the low-speed shaft passing through an aperture in the wall of the hub shell (see Figure 6.6), then the maximum teeter excursion is governed by the size of the aperture.

The teeter response to deterministic and stochastic loads is considered in Section 5.8.8. Although it is evident that a permitted teeter angle range of the order of ±5° will accommodate the vast majority of teeter excursions during normal operation, it is usually impracticable to accommodate the largest that can occur. Hence, in order to minimize the occurrence of metal-to-metal impacts on the teeter end stops, buffers incorporating spring and/or damping elements normally have to be fitted. These also perform an important role in limiting the much larger teeter excursions that would otherwise arise during start-up and shut-down, when the centrifugal restoring moment is reduced.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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