Constant / Math expression log file or worksheet?

[speedsport]

Hello -

I have linear shock pots on my formula car. I also have packers in the front shocks to limit bottoming under braking. I created a math channel that takes the clearance of the shock body to the packers at static ride height and subtracts the linear pot value to display the distance the packers are compressed. Positive is clearance, negative is compression.

The issue I have is each time I zero the shock pots when the car is on the platform, I have to start with a new clearance value of the packers as the constant. However, if I update the constant it changes it in all old log files, which I don't want.

Is there a way to keep the math expression tied to the worksheet, but the constant tied to the log file? Ideally I would not have to enter the constant in each log file, but only update it when it changes.

[NathanB]

In the maths window there is workspace maths, and log file maths.

Anything put in the log file maths is stored in the .ldx file for that log.

Maths window.jpg (97.12 KiB) Viewed 4618 times

[speedsport]

Thank you -

I didn't like the solution of having to add the constant to each log file. Instead I created constants in my SDL3 that will be logged. I created constants for the spring rates and packer clearance. This way they will be automatically carried over to each log file, and will remain the same value until changed. All I'll have to do is remember to update the constant values in the configuration file if anything changes.

I'll give this a try and see how it works out.

[David Ferguson]

If you are using I2 Pro, then answer is Setup Sheets. These are spreadsheets (per vehicle) with constants that vary over time. I2 is smart enough to pick up the proper constant based on the time of the log file. So if you change the rake of the car at 9am, and then download the session at 10:30, it will pick up the constants for things like rake, motion ratios, spring rates, etc.

[speedsport]

Thanks David,

I will look into using Setup sheets.

Michael