Campbell CR800 Especificações descarregar pdf (Página 144)

Section 6. Data Table Declarations and Output Processing Instructions

6-26

RainFlow (Source, DataType, DisableVar, MeanBins, AmpBins, Lowlimit,

Highlimit, MinAmp, Form)

Parameter

& Data Type

Enter

Source

Variable

The variable that is tested to determine which bin is selected

DataType

A code to select the data storage format.

Constant

Alpha Code Data Format

IEEE4 IEEE 4 byte floating point

FP2 Campbell Scientific 2 byte floating point

DisableVar

Constant,

Variable, or

Expression

A non-zero value will disable intermediate processing. Normally 0 is entered so all inputs

are processed. For example, when the disable variable is ≠0 the current input is not

included in the histogram. The histogram that is eventually stored includes the inputs that

occurred while the disable variable was 0.

Value Result

0 Process current input

≠ 0

Do not process current input

MeanBins

Constant

This parameter allows sorting by the mean value of the signal during a stress strain cycle.

The number entered is the number of bins or subranges to sort the mean values into.

Enter 1 to disregard the signal value and only sort by the amplitude of the signal. The

width of each subrange is equal to the HiLimit - LowLimit divided by the number of bins.

The lowest bin’s minimum value is the low limit and the highest bin’s maximum value is

the High limit

AmpBins

Constant

The number of bins or subranges to sort the amplitude of a stress strain cycle into. The

width of each subrange is equal to the HiLimit - LowLimit divided by the number of bins.

LowLim

Constant

The lower limit of the input signal and the Mean Bins.

UpLim

Constant

The upper limit of the input signal and the Mean Bins.

MinAmp

Constant

The minimum amplitude that a stress strain cycle must have to be counted.

Form

Constant

The Form code is 3 digits - ABC

Code Form

A = 0

Reset histogram after each output.

A = 1

Do not reset histogram.

B = 0

Divide bins by total count.

B = 1

Output total in each bin.

C = 0

Open form. Include outside range values in end

bins.

C = 1

Closed form. Exclude values outside range.

101 means: Do not reset. Divide bins by total count. Closed form.

Processes data with the rainflow counting algorithm, essential to estimating

cumulative damage fatigue to components undergoing stress/strain cycles.

Data can be provided by making measurements in either the standard or the

burst mode. The Rainflow Instruction can process either a swath of data

following the burst mode, or it can process "on line" similar to other

processing instructions.

The output is a two dimensional Rainflow Histogram. One dimension is the

amplitude of the closed loop cycle (i.e., the distance between peak and valley);

the other dimension is the mean of the cycle (i.e., [peak value + valley

value]/2). The value of each element (bin) of the histogram can be either the

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