Mean

Compute mean value of signal

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Libraries:
Simscape / Electrical / Specialized Power Systems / Sensors and Measurements

Description

The Mean block computes the mean value of the input signal. The mean value is computed over a running average window of one cycle of the specified fundamental frequency:

$$\begin{array}{l}Mean\left(f(t)\right)=\frac{1}{T}{\displaystyle \underset{(t-T)}{\overset{t}{\int }}f(t)\cdot dt}\\ f(t):\text{input signal, T = 1/fundamental frequency}\end{array}$$

As this block uses a running average window, one cycle of simulation must complete before the output gives the correct value. For the first cycle of simulation, the output is held constant to the specified initial input value.

Characteristics

Sample Time	Specified in the Sample Time parameter Continuous if Sample Time = 0
Scalar Expansion	Yes, of the parameters
Dimensionalized	Yes

Examples

Determine Mean Value of DC Signal with 12th Harmonic Ripple

The power_Mean model uses the Mean block to determine the mean value of a DC signal containing a 12th harmonic ripple.

The model sample time is parameterized by the Ts variable set to a default value of 50e-6 s. Set Ts to 0 in the command window to simulate the model in continuous mode.

Ports

Input

Port_1 — Input signal

Simulink^® signal

The input signal for which the block computes the mean value, specified as a Simulink signal.

Output

X — Mean value of input signal

Simulink signal

The mean value of the input signal, returned as a Simulink signal.

Parameters

Fundamental frequency (Hz) — Fundamental frequency

60 (default) | positive scalar

Specify the fundamental frequency, in hertz. This value determines the period (1/F) of the running average window.

Initial input (DC component) — Input value for first simulation cycle

0 (default) | scalar

Specify the input value for the first cycle of simulation.

Sample time — Sample time of block

0 (default) | nonnegative scalar

Specify the sample time of the block, in seconds. Set to 0 to implement a continuous block.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2013a