General description
With the help of this program a model drawing of the test specimen, e.g. drive system, may be created and then animated with data from RAS/USA measurements.
The procedure for generating a drawing is similar to when using a CAD system. The drawings consist of individual points connected by lines. Drawings are 3-dimensional, the co-ordinates of the points are entered via menu input fields. Drawing of the connecting lines is done interactively. To facilitate modelling of timing-belt systems, the program allows for disks (representing pulleys) and axes to be drawn. A pointer may also be defined, the length of which is proportional to amplitude.
Animations of linear quantities appear as movements in space of points with their related lines. Animations of torsional vibrations appear as vibrating pointers within disks.
The graphics package allows the user to create high-quality graphic images that can be exported to other applications via the Clipboard or saved as Windows Metafiles.
The maximum number of points and discs allowed is 100. The maximum number of connecting lines allowed is 230.


Chief Characteristics
An animated model consists of the following components:
* Individual Points positioned in the x, y, z co-ordinate system. Each point possesses a Number, a Name and a Data Set.
* When depicting torsional vibrations Disks may be defined. The disk surface contains a pointer extending outwards from the centre to the circumference. The pointer represents the vibration. Each disk possesses a Number, a Name and a Data Set. Disks can also vibrate in a linear fashion.
* The position of a Line is determined by the two points which it connects.
Each element can be assigned to one of 12 Groups (A bis L). Each Group has a unique colour which is seen in the Points and Lines. For each model these Group Colours can be selected by the user. Lines which connect Groups can be assigned a colour by the user. Complete Groups may be hidden from view if required.
Independent Points, which respond to their own data sets. The movement of Dependent Points is dependent on other points. A dependent point depends on a maximum of two independent points.
A Point may be Animated statically with an amplitude and phase value or with a data set. The data set can either be a series of amplitudes versus time, or alternatively spectral values (amplitudes and phases) versus time or speed.

Display
The following cases are provided for:
* Show / Hide all Points, Point No., Point Names, Amplitude.
* Each model may be zoomed within the boundaries of its window. Furthermore, the model can be moved and rotated in space. The current rotary position is shown by a small axis-system on the screen.

Moving
The following cases are provided for:
* User-selectable speed and amplification of the animation.
* During editing of model parameters the animation continues to run.
* An envelope curve with user-selectable number of lines (from 3 to 18) can be displayed and printed. Lines representing different phases have different colors.
* Up to 4 windows for animations may be activated simultaneously. A single model may be animated per window. The phase between models may be adjusted.
* The time corresponding to the animation may be read off from the cursor on the measurement curve. This cursor may be dragged with the mouse and also held stationary.

FEAD System Animation
3^rd order peak RPM vs. Crank Speed
Shown:  736, 3000 and 5957 RPM

Software, Simulation

rotec P/N 113.SWSIM

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.
The following five elements are used when generating a model system for simulation: Mass with Excitation Force, Mass, Spring-Mass, Transmission Ratio and Earth. The user may interactively position these symbols and then make appropriate connections with lines to construct straight, branched and meshed structures. Initializing an excitation is accomplished with either (i) a Sweep (sinusoidal frequency function, steps within user-defined frequency limits, constant amplitudes), (ii) a List of amplitudes versus frequency or speed or (iii) directly via a RAS / USA measurement Channel. The results which are calculated are in curve files, e.g. the vibration angle for specified Elements of the model. These curves can be directly displayed within the Simulation program environment, animated in the Animation program and combined with other curves using the rotec Graphics. Additionally, the acceleration measured on an Element may be used to determine excitation moments and power. This applies to both alternating and steady state components. An example of this is the derivation of engine power from the acceleration as measured at the flywheel. Inverse simulations may be performed, i.e. the calculation of individual model parameters from measurement data. In such cases the model is dimensioned as far as possible and then linked to curves from test data. The Simulation software then determines unknown model parameter values consistent with the test data.
The procedure for generating a model drawing is similar to that when using a CAD system. The drawings consist of individual elements connected by lines. Drawing of the connecting lines is done interactively. The graphics package allows the user to create high-quality graphic images that can be exported to other applications via the Clipboard or saved as Windows Metafiles. Images copied to the Clipboard can be pasted to documents in other applications. Pictures created in other applications and saved as Windows bitmaps and metafiles (e.g. logos) can be imported to the specified location in any graph. Images saved as metafiles can be imported into an application directly. Formatting can be done interactively (double-clicking the element) or via Edit Format in the Layout menu.

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