http://blog.prosig.com/2005/10/19/analyzing-shaft-twist-and-repairing-damaged-tachos/ Telling you what you need to know about noise & vibration Tue, 07 Feb 2012 15:32:30 +0000 hourly 1 http://wordpress.org/?v=3.3.1 http://blog.prosig.com/2005/10/19/analyzing-shaft-twist-and-repairing-damaged-tachos/comment-page-1/#comment-935 Qiao Fri, 21 May 2010 06:34:54 +0000 http://blog.prosig.com/2005/10/19/analyzing-shaft-twist-and-repairing-damaged-tachos/#comment-935 1. Based on the tacho signal in Figure 1, we can only calculate the speed at equi-spaced angular positions. How can the equi-spaced angular speed be processed to a RPM-Time signal in Figure 2? Is the speed curve in Figure 2 at equi-spaced time intervals? 2. Similar question for Figure 6 twist angle signal, is it at equi-spaced time intervals as well? Is it the result of front_speed-time signal minus rear_speed-time signal? 3. I do not quite understand your mentioned "This module uses a reference tachometer, in this case the once per rev rear trigger signal, to resample the data at constant angle separation." What does the "data" for resampling refer to? Is it the data in Figure 1 or Figure 6? 1. Based on the tacho signal in Figure 1, we can only calculate the speed at equi-spaced angular positions. How can the equi-spaced angular speed be processed to a RPM-Time signal in Figure 2? Is the speed curve in Figure 2 at equi-spaced time intervals?
2. Similar question for Figure 6 twist angle signal, is it at equi-spaced time intervals as well? Is it the result of front_speed-time signal minus rear_speed-time signal?
3. I do not quite understand your mentioned “This module uses a reference tachometer, in this case the once per rev rear trigger signal, to resample the data at constant angle separation.” What does the “data” for resampling refer to? Is it the data in Figure 1 or Figure 6?

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