Online mode displays results of evaluations in real time during the measurement. The measurement data is stored as series of spectra with amplitudes and phases. Compact data storage format allows data acquisition over long periods.


Configuring the Trigger Board and the Measurement Channels

* order analysis referenced to a selected speed channel
* order range 0 to 512, selectable
* order resolution 0.025 to 1, selectable
* frequency analysis
* frequency resolution 0.125 Hz to 250 Hz, selectable
* automatic data saving, 20/sec to 0.1/sec, selectable
* manual data saving per keyboard stroke


Calculation and Display during the Measurement

* single order and order interval as a function of time or of the rotational speed of the reference channel
* single frequency and frequency interval as a function of time
* order spectrum (amplitudes or phases) with current values (= real-time spectrum)
* frequency spectrum (amplitudes or phases) with current values (= real-time spectrum)
* amplitudes as vibration angle in [deg, rad], degree of non-uniformity in [%], fluctuation in rotational speed in [rpm], angular velocity in [deg/s, rad/s], angular velocity in [deg/s*s, rad/s*s]
* analogue values singly and doubly integrated or differentiated
* phases [± 180°, 0 - 360°, ± ¥] of rotational-speed fluctuation and fluctuation in analogue values
* per diagram up to 2 different y-axes and up to 6 curves simultaneously
* maximum of two diagrams simultaneously

Software, Gear Testing

rotec P/N 111.SWEFP

The running behavior of gearsets may be investigated using an analyzer fitted with at least two speed channels. High-resolution rotary incremental encoders typically provide signals. These tests may be performed both on-the-road and in stationary applications. The analyzer's high accuracy and high dynamic (> 190 dB) allows measurement over a wide rotational speed range. Results for angular displacement (transmission error) may be expressed in degrees, µrads, arc seconds or µm pitch diameter.

Single Flank Test (DIN 3960 Standard)

* single-flank transmission error
* long wave and short wave components


Extended Single Flank Test

* evaluation of the average transmission error
* evaluation of the transmission error for selected teeth
* analysis for complete or partial over-rollings
* arbitrary referencing between measurement channels
* investigations over rotation angle and in in order domain

Single Flank Testing of compound gearsets

* useful for testing of differentials and power transmission arrangements

Rotation-Angle Calculations


This type of analysis references rotational speed or analogue amplitudes to the angle of rotation of a speed channel. The starting position is set by an offset angle.

Absolute Angular Displacement

Evaluation of the absolute angular displacement between two speed channels is an extension of the procedure used for the relative angular displacement. In the case of the latter each evaluation begins with the value zero. Prerequisites for the evaluation of the absolute angular displacement are:

* a change in direction of rotation during the measurement is not permitted.
* only the three simplest transmission ratios are permitted (1:1, 1:2 and 2:1)
* marks are required on both speed channels
* slip between the two channels is not allowed


Markings
Three types of marking may be used
* filed-down tooth flank:
the flank of one of the teeth on the toothed wheel being scanned is filed down. This results in a reduction of the tooth width and an increase in the gap between two teeth and produces an apparent spike in the rpm versus time curve
* missing tooth (tooth gap):
one tooth is removed from the otherwise uniform distribution of teeth around the wheel circumference
* extra tooth:
to the otherwise uniform tooth distribution, an extra tooth is inserted in the gap between two teeth

Notes: The two speed channels may have different types of marking, i.e. the three types of marking may be flexibly combined.

Static angular difference between the markings on the two channels must be known in order to calculate absolute angular displacement. This is a combination of the angle between the two markings and the angle between the two rotational-speed transducers.