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Each plot contain a set of asterisks at distinct angles. These are symbolic representations of the region of the sun gear that is aligned when a given planet is aligned with a given accelerometer. The simultaneously aligned planets are denoted by the three Planet IDs that accompany the markings and the sequence extends radially inward in the planet passing order.
Figure 19, shows the result after 18 planet passes on ac-celerometer A1. There are only 6 distinct regions of the sun gear that are aligned when any of the four planets are aligned with A1. Looking at the Planet ID sequence reveals that diametrically opposing planets align with the same sun gear regions. The spacings of the regions are also unequal, due to the unequal spacing of the planets.
In the case for PGVS, since the hunting tooth ratio was Np, extractions were possible when each planet tooth was in the same physical orientation. This allowed for each in-dividual tooth mesh waveform to be directly compared to every other. However, for the current SGVS scenario, only three teeth can be directly compared if using only a single planet and six teeth if using multiple planets. Another pos-sibility is to compare the data corresponding to a span of teeth. This is accomplished by extracting data associated with multiple teeth, i.e., Mv > 1.
Sun ”seen” through a Single Planet (Mv > 1)
The asterisks in Figure 19 represent a single TMP (Mv = 1). If data is extracted representing a longer duration, the span of teeth increases. Figure 20 shows the case for Mv = 9 through a single planet, P2.
Here, different symbols are used to represent the three different regions. These plots says that each time the planet P2 passes by accelerometer A1, extracted data corresponds to four TMPs prior to and 4 TMPs after planet/accelerometer alignment. The value of 9 is chosen to divide the sun’s 27 teeth evenly. For this diagrams, there is no overlapping of symbols.
Cases using multiple planets and multiple accelerome-ters are addressed in (Ref. 27).
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本文链接地址：Sun Gear Fault Detection on an OH-58C Helicopter Transmission(19)
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