SensorLoad

A sensor attached to a load, which measures the value of the load.

Parameters

The parameters of the item; in a dictionary, its type is ‘Load’:

name	type	default	description
name	String	‘’	sensor’s unique name
loadNumber	LoadIndex	invalid (-1)	load number to which sensor is attached to
writeToFile	Bool	True	True: write sensor output to file; flag is ignored (interpreted as False), if fileName=’’
fileName	String	‘’	directory and file name for sensor file output; empty: no file is written; a relative name is placed in `exudyn.config.outputDirectory` if that is set; the directory is created if it does not exist
storeInternal	Bool	False	true: store sensor data in memory (faster, but may consume large amounts of memory); false: internal storage not available
visualization	VSensorLoad		parameters for visualization of item

Visualization parameters

The parameters of VSensorLoad, given as visualization:

name	type	size	default	description
show	Bool		True	set true, if item is shown in visualization and false if it is not shown; the sensor is drawn at the position of the marker of its load, if the marker has a position

Drawing

Drawn as all sensors; at the position of the marker of its load, if the marker has a position; a load on a coordinate has none.

Detailed description

Attached to

The load loadNumber.

Measures

The value of the load at the current time: the vector or the scalar, as the load item computes it - from loadVector or load, or from its user function - and in the frame it is given in, which is the body frame for a load with bodyFixed = True. The load factor of a static computation is not included. There is no outputVariableType.

Mini example

#the value of a load, here of a load with a user function, which the load vector does not show
node = mbs.AddNode(Node1D(referenceCoordinates=[0]))
mbs.AddObject(ObjectMass1D(nodeNumber=node, mass=1))
mCoord = mbs.AddMarker(MarkerNodeCoordinate(nodeNumber=node, coordinate=0))
def UFload(mbs, t, load):
    return load*np.cos(np.pi*t)
lCoord = mbs.AddLoad(LoadCoordinate(markerNumber=mCoord, load=2, loadUserFunction=UFload))
sLoad = mbs.AddSensor(SensorLoad(loadNumber=lCoord, storeInternal=True, writeToFile=False))

mbs.Assemble()
mbs.SolveDynamic()

#the load at t=1: 2*cos(pi)
exu.sys['testResult'] = mbs.GetSensorValues(sLoad) #-2

Examples (Ex) and TestModels (TM) that show this item, with weblink to github: springDamperUserFunctionTest.py (TM), plotSensorTest.py (TM)