FIRST PRINCIPLES DATABYTES
switching to distance shows that it is in fact on the red lap that brakes were applied earlier.
Time is also relative When time is used as a reference point for data analysis, lap time is normally the standard reference, so the time starts when a new lap begins and runs until the start/ finish line is crossed again. This is fine for looking at single laps or single outings, but if the intention is to view trends in multiple outings, a different time scale needs to be used. For this the concept of global time can be useful. Global time is the time of day, found either by using the internal clock on the data system or, if possible, by using time from a GPS system. Using global time makes it possible to stack outings based on the time of the day and view trends easily over a long period, and it can be seen whether or not any data is missing. This is especially important in endurance racing as there is a wealth of data gathered, and if something goes wrong with the internal clock of a data system it can be difficult to organise the different outings. A good example of the use of
Figure 2 Driver comparison in the time domain (above) and in the distance domain (below)
global time can be seen here, where a number of outings are organised on a time scale so any trends can be monitored. It is also possible to see that at one point between two outings there is an unusually large gap, in this case the car most likely spent some time in the pits before continuing. A further analysis on this gap revealed that there were in fact 172 seconds between the two. Any good data system will have
a number of different options for comparison, scales and reference points. This allows the user to present the data in the most useful format to get the most out of the information gathered. Great care must be taken in making data.
Outings are organised on a time scale so any trends can be monitored 62
www.racecarengineering.com • August 2011
Produced in association with Cosworth Tel: +44 (0)1954 253600 Email:
ceenquiries@cosworth.com Website:
www.cosworth.com/motorsport
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