modelNominalLifeRating
Calculation of nominal life rating for ball screw (see A. Mannesmann)
Extends from Modelica.Blocks.Interfaces.SI2SO (2 Single Input / 1 Single Output continuous control block).
Information
This blocks computes output y as sum of the two input signals u1 and u2:
y = k1*u1 + k2*u2;
Example:
parameter: k1= +2, k2= -3
results in the following equations:
y = 2 * u1 - 3 * u2
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Force | C_am | 50000 | Dynamic load rating |
| SI.Force | F_pr | 0.07*C_am | Preload force |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| RealInput | u1 (from SI2SO) | Connector of Real input signal 1 | |
| RealInput | u2 (from SI2SO) | Connector of Real input signal 2 | |
| RealOutput | y (from SI2SO) | Connector of Real output signal |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Force | F_a | Axial operation force | |
| SI.Force | F_w | Operation force with preload | |
| SI.Force | F_w_m | Effective operation force | |
| SI.AngularVelocity | w | Angular velocity of ball screw | |
| SI.AngularVelocity | w_m | Average angular velocity | |
| Real | temp_F | ||
| Real | temp_w | ||
| Real | L_10 | Number of 10^6 revolution with 90 % life expectancy | |
| SI.Conversions.NonSIunits.Time_hour | L_h | Life expectancy on 90 % level |