Rotecus- Specifications: Vibration Measurement and Analysis Equipment

rotec
www.rotecus.com

For sales and support in North America, please contact:

125 South Main Street
Milford, MI 48381-1963
Phone (248) 685-8148
Fax (248) 685-1577
www.angerinc.com info@angerinc.com

rotec GmbH - Frankfurter Ring 193a,
D-80807 München

Phone: +49 89 32 36 51 0
Fax: +49 89 32 36 51 56

Specifications:

Vibration Measurement and Analysis Equipment

Multi-Channel, Digital & Analog Acquisition, Analysis, Animation, Simulation

rotec

Torsional Analysis

rotec, founded 1988 and located in Münich Germany, specializes in the design and manufacture of rack mountable and portable Pentium-based systems for multi-channel measurement and analysis of torsional and linear vibrations. Driven by the engineering demands of their large automotive customer base, special development emphasis is placed on very high-speed data acquisition and analysis. rotec equipment is used in a wide range of applications for investigations of engine and driveline components on the road, in the laboratory and on the plant floor.

The equipment is modular and can be configured to measure up to 10 phase matched axis' simultaneously and up to 64 channels of phase matched 16-bit analogue inputs. These analogue inputs may be any mix of current source accelerometers, microphones or DC voltage. The excellent phase accuracy and measurement resolution delivered by the equipment has also allowed it to become the premier system for single flank gear testing systems in both production and laboratory environments.

The demand for smoother running, more reliable machines dictate the use of dynamic noise and vibration analysis. In the design and development of engine and power transmission systems, minimizing torsional vibration is fundamental. rotec systems are proven to deliver more rapid and accurate measurement and analysis of torsional and linear vibration than conventional analog methods. This speed, system flexibility and accuracy allows engineers to quickly pinpoint sources of machinery problems.

Portable, PC-based systems
Rotec RAS and USA models Analyzers are modular and can be tailored to specific application requirements. They allow the user to make synchronous, multi-channel acquisition and analysis of both digital and analog signals. With a comprehensive range of evaluation software, the RAS and USA are among the most flexible and easy to use systems of their kind and deliver results faster than other analyzers.
The analyzers are fitted with 32-bit counter / timer boards for recording square wave TTL level inputs from dynamic rotational speed sensors (i.e. incremental encoders, gear tooth sensors, laser tachometers, etc.) The analyzers may also be fitted with analog input boards for collection of structure borne vibration, airborne noise and other dynamic signals.
A 100MHz-quartz oscillator (1GHz optional) provides a common time base for all channels, speed and analog, eliminating phase errors.

RAS / Main Features
· Portable, robust carrying case
· Windows NT operating system
· Modular construction, up to 64 channels
· Input signals / resolution
Digital: TTL level, 32 bit/10ns
Analog: ±10V & ICP, 16 bit/200kHz or 50kHz

Rotational Speed Signals
Digital signals (TTL pulses, 0/5V) represent constant angular intervals around the rotating shaft and provide information on the evolution in time of the instantaneous rotational speed. These rotational signals originate from proximity sensors, incremental encoders or optical tachometers which detect angular motion of the specimen under test. Maximum input frequency is 390 kHz

Analog Signals
rotec offers two types of A/D boards for acquisition of signals from accelerometers, microphones and other dynamic phenomona. An 8- channel 50 kHz board and a 2-channel 200 kHz boards are available. Input range on both boards is ±10V at 16-bit resolution. Digital downsampling, anti-alias filtering, programmable gain, AC/DC coupling and differential or ICP inputs are provided.
Software
rotec software is 32 bit Windows based and provides the user with an easy to use, flexible and powerful tool for data acquisition, storage and output of 1 to 64 channels.
Two operational modes are possible:
In 'offline' mode, data is collected and stored as time history and evaluated following the measurement. In the 'online' mode, evaluation is performed during the measurement with results displayed in real-time, data being stored as spectra. Analysis in both the time and spectral domains are provided for. All quantities may be represented as a function of time, angle or rotational speed.
Simple system triggering and software set-up allows inexperienced user or unattended data collection and analysis. RPM variation, angular velocity, vibration angle and angular acceleration may, for example, be evaluated on torsional vibration channels. Multiple channel speed measurements may be evaluated for angular displacement, transmission error, slip and speed differences between user selected channels. Analog signals may be frequency and order analysed referenced to selected speed channels and may be single or double integrated and/or differentiated. All evaluations are automatically interpolated utilising cubic spline. Special software modules include single flank testing for gear sets, differential & planetary gear set evaluations, compensation for missing, modified or bonus gear teeth, acoustic evaluations, filtering and statistical analysis.

Specifications

rotec Software provides the following functionality:

Time Domain (only for time-histories, offline mode)
Representation as function of time or as a function of the number of revs of a reference speed channel, 2D diagrams

Evaluations for rotational speed
· rotational speed and fluctuation in rotational speed in [rpm]
· angular velocity in [deg/s, rad/s]
· angular acceleration in [deg/s*s, rad/s*s]
· vibration angle in [deg, rad]

Evaluations for analogue quantities
· analogue value
· 1st and 2nd integral, 1st and 2nd derivative

2-channel evaluations taking transmission errors into account, where applicable
· relative angular displacement (transmission error) in [µrad], [deg], [arc seconds], [µm pitch circle]
· difference in rotational speed in [rpm], slip as a fraction [1] or in [%]

Frequency Domain (Order and Frequency Analysis)
Representation as function of time or as a function of the number of revs of a reference speed channel
· 2-dim and 3-dim diagrams, vector plots
· amplitudes of individual orders (or frequencies) and for selected order intervals
· waterfall, Campbell and contour plots, linear or logarithmic, peak or rms

Evaluations for Amplitudes
· rotational speed fluctuation in [rpm]
· angular velocity in [deg/s, rad/s]
· angular acceleration in [deg/s*s, rad/s*s]
· vibration angle in [deg, rad]
· degree of non-uniformity in [%]
· fluctuation in analogue value
· 1st and 2nd integral, 1st and 2nd derivative

2-channel evaluations taking transmission errors into account, where applicable
· relative angular displacement (transmission error) in [µrad], [deg], [arc seconds], [µm pitch circle]
· difference in rotational speed in [rpm], slip as a fraction [1] or in [%]

Evaluations for Phases
phases [± 180°, 0 - 360°, ± ¥ ] for selected orders or frequencies
absolute phases, phase difference between two orders (or frequencies) or between two channels
· phase of the rotational-speed fluctuation
· phase of the analogue value fluctuation
· phase of the angular displacement, difference in rotational speed, slip

Extras menu:
smoothing for 2-dim curves
· SPLINE for smoothing of curves containing few data points. User-selectable stepwise graduation.
· FIT for smoothing of noisy curves. User-selectable stepwise graduation.
· AUTO for automatic smoothing.
frequency filter IIR, time domain (for time histories)
· user-selectable filter order (1 to 10) and cut-off frequency
· filter types: Butterworth, Chabychev, Cauer, Bessel
· characteristics: low-pass, high-pass, band-pass, band-stop
order filter (for time histories)
orders are deleted in the time domain. This ensures that data is not distorted due a Fourier transformation followed by an inverse transformation. One individual order or alternatively an order interval may be deleted.

statistics for time histories
· histogram
· cumulative distribution
statistics for overviews (spectra)
· arithmetic, harmonic and geometric mean, median
· variance and standard deviation
spectra (for time histories)
· versus frequencies and orders, linear or logarithmic
· reverse transformation (inverse FFT)
correlation
· auto-correlation and cross-correlation (normalized, not normalized)
· convolution

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

Evaluations for rotational speed data
· rotational speed in [rpm]
· rotational speed fluctuation in [rpm]
· angular velocity in [deg/s, rad/s]
· angular acceleration in [deg/s*s, rad/s*s]
· vibration angle in [deg, rad]

for analogue values
· fluctuation in analogue value
· 1st and 2nd integral
· 1st and 2nd derivative

2-channel evaluations taking transmission errors into account, where applicable
· relative angular displacement (transmission error) in [µrad], [deg], [arc seconds], [µm pitch circle]
· difference in rotational speed in [rpm]
· slip as a fraction [1] or in [%]

Additional Software:
P/N 112.SWANI Animation Software
· wireframe animation of captured data

P/N 113.SWSIM Simulation Software
The Simulation program allows the user to create a model of a vibrating system. Numerical calculations may then be performed on the model. The program can be applied to both torsional and linear vibrations. It runs as an integrated part of the RAS software environment and is compatible with all rotec software (w.r.t. data exchange and data formats). Simulations run as a function of frequency. When performing evaluations on time histories and on speed run-ups, discrete time intervals are first frequency transformed, simulated, and then transformed back into the time domain. The direct comparison of simulation curves with test data makes optimal adjustment of simulation parameters possible.

For sales and support in North America, please contact:

6743 Highland Road, Suite 7
Waterford, MI 48327
Phone (248) 666-8150
Fax (248) 666-9238
www.angerinc.com info@angerinc.com

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