Accelerating the pace of engineering and science

# Documentation Center

• Trial Software

# Rotational Power Sensor

Mechanical sensor used to measure average or instantaneous rotational power

Sensors

## Description

The block represents a sensor that you can use to measure the rotational power change due to one or more driveline components connected between ports R and C. The power output can be an instantaneous or average value. Three averaging options are available: period, vibration, and revolution averaging.

The instantaneous power is the product of the current angular velocity and torque. Use the instantaneous power to analyze peak power transmission and identify heavily-loaded components.

The time-averaged power is the integral of the instantaneous power over one sample period, divided by that period. For simulation times smaller than the sample period, the average power is zero. The power output is constant for each sample period.

The vibration-averaged power is the integral of the power over one vibration period, divided by that period. The vibration period is the time between two consecutive crossings from negative to positive velocity values. The averaging period can change if the vibration has a variable frequency. For simulation times smaller than the vibration period, the average power is zero. The power output is constant for each vibration period.

The revolution-averaged power is the integral of the instantaneous power over one revolution period, divided by that period. The revolution period is defined as the time between two consecutive crossings of zero angular position. The averaging period can change if the revolution has a variable frequency. For simulation times smaller than the revolution period, the average power is zero. The power output is constant for each revolution period.

## Dialog Box and Parameters

Measurement Type

Select either instantaneous or average power measurement. The default type is Instantaneous Power.

• Instantaneous power — Output the rotational power measured for the current simulation time step.

• Average power over a specified period — Output the rotational power averaged over a fixed time period.

Averaging period

Enter the time period used to compute the average power. Typical values include the cycle length of a rotating device.

The default value is 1. The default unit is s.

• Average power over a vibration — Output the rotational power averaged over one vibration period.

Maximum vibration frequency

Enter the maximum vibration frequency over which the rotational power should be averaged. Very high values can reduce simulation speed. Very low values can result in lower power measurements.

The default value is 1000. The default unit is Hz.

• Average power over a revolution — Output the rotational power averaged over one revolution period.

Maximum rotational speed

Enter the maximum speed over which the rotational power should be averaged. Very high values can reduce simulation speed. Very low values can result in lower power measurements.

The default value is 1000. The default unit is rpm.

## Ports

PortDescription
PPhysical signal output port for rotational power
SRotational conserving port associated with driving source
CRotational conserving port associated with loaded driveline component(s)
RRotational conserving port associated with case holding loaded driveline component(s)