1. Performance Prediction Spreadsheet
NAHI
hydroCalc
Performance Prediction Spreadsheet

2. hydroCalc – What is it? Fancy spreadsheet tool
Calculates hydrostatic system performance
Is not a selection tool!
but makes it easier to see the results of your selections.
Inputs:
Pump, motor, final drive, pressure limit
Engine speed, power, vehicle weight, rolling resistance
20 Operating points: pump & motor displacement
Option to override Max Pressure, Engine HP & RPM
Outputs:
Estimated component and system performance
Steady state operating conditions
Numbers and Charts
Suitable to send to customer

4. hydroCalc Capabilities
Performance estimate for hydrostatic system
All pumps and motors connected in parallel
Multiple pumps of same size
Two sets of output drives can be specified (axles)
Multiple motors of same size in each set
Within a set, each motor has the same FD ratio, effic, radius.
Common rolling resistance coefficient for all wheels
Vehicle weight is evenly distributed over all wheels
No wheel slip calculation
Hydrostatic efficiencies:
Change with operating conditions.
Are average approximations of typical units
Less accurate at Low: speed, pressure, displacement
Opportunity for future enhancement

5. Enable Macros Open Excel file
Enable Macros (Security Warning-Options; Enable this content)
‘Save As’: ‘Macro-Enabled Workbook’ with new name
Data entry areas have blue text, other cells are locked
Spreadsheet automatically recalculates after every entry
If you see a group of errors, click the red “Reset” button.

6. First Time Set-up
If you have problems the first time you run hydroCalc:
You may need to enable Automatic Calculations and Iterative Calculations
Open ‘Office Button’, then ‘Excel Options’ at the bottom of the window.
Select ‘Formulas’ on the left list and make settings shown below

7. Operating Conditions (20)
Input Fields
System Information
Operating Conditions (20)

9. Detail Output Numbers

10. Charts

11. Charts

12. Charts

13. Usage Guidelines Steve & Brandon can run program & generate output
Still being developed
There are some bugs and idiosyncrasies
Can be used for hydrostatic Propel or Non-Propel
Also can show gearbox performance in a system
Only give PDF printout to customers
Do not send complete spreadsheet to customers!
This is a great sales tool!

14. Help Make it Better Suggestions to improve Corrections
Better explanations
Added features
Name?
Ideas for other super spreadsheet tools 

15. Questions?