RE: Các bác có cái máy này ko?
How does the G-Timer know the speed and distance?
The G-Timer tracks acceleration forces over time, and from this continuously calculates speed and distance. For accuracy, it tracks all these items approximately 200 times per second.
Here's a simplified explanation of how the system works:
For this simplified example, we'll assume a G-Timer that performs calculations only once per second. We'll also assume that our car can accelerate with a force of 0.45G.
An acceleration of 1 G means that car would accelerate at 32.2 feet per second per second, which is about 22 mph per second. (That means, from a standing start, after one second, the car would be going 22 mph. After two seconds it would be going 44 mph, etc.)
In our example the car accelerates at 0.45G, which is about 10 mph per second.
So, let's look at the 1st second of our timed run: We were going 0 mph at the beginning of that second, and we were going 10 mph at the end of that second. So our average speed during that second was 5 mph. We can then calculate how far the car went: 5 miles per hour = 26,400 feet per hour = about 7 feet per second.
So after the 1st second, we've traveled 7 feet, and we're going 10 mph.
Now let's look at the 2nd second of our timed run (remember, we're still accelerating at 10 mph per second): We were going 10 mph at the beginning of that second, and we were going 20 mph at the end of that second. So our average speed during that second was 15 mph. We can then calculate how far the car went, which turns out to be about 22 feet.
So after 2 seconds, we've traveled 7 + 22 = 29 feet, and we're going 20 mph.
Now let's look at the 3rd second of our timed run: We were going 20 mph at the beginning of that second, and we were going 30 mph at the end of that second. So our average speed during that second was 25 mph. We can then calculate how far the car went, which turns out to be about 37 feet.
So after 3 seconds, we've traveled 7+22+37 = 66 feet, and we're going 30 mph.
This is a simplified way to see how the G-Timer tracks speed and distance during a timed run. Remember, in actuality, the G-Timer continuously measures G-forces, and makes these calculations hundreds of times each second.