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Tuesday, 23 January 2018

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Fly System

A fly system that uses four rope winches for the positioning of stage components was developed for the TTC Corporation. 

The system set includes an operator's control panel, drives and hoists.

The figure below illustrates the block diagram of the control system.

3D Fly Machine

The hoist is suspended at the junction of the four lines that are rove through the blocks and mounted at the stage corners. All the motors are equipped with absolute encoders that transmit a signal directly to the frequency converters to control the position of the lines.

The 3D trajectories of the objects are defined using the software. They are displayed on the operator's screen and stored in a database. The user can save and edit existing trajectories creating a view history database.

The trajectories are displayed in 3D with the ability to view the projections from every plane.

The user can change the projection and scale of the stage in order to obtain the best visual reference using a trackball.

 

The software for the operator's workstation was developed using Qt 4.7 libraries and OpenGL. The workstation itself runs on Ubuntu Linux.

3D Screenshot Operator

Every trajectory is stored in the system as a set of base points. Input can be done analytically (in the table) or by saving the current position of the object.

The base points of the trajectory are entered into the SM-Applications driving module where, using a specially-developed algorithm, the trajectory and the position settings signals are calculated for each driven converter before a movement begins.

The CT-Net network is used to load the coordinates into each slave servo drive. The drives then configure the positioning points.

 

The 3D coordinates of the object's position are converted into line length values which are manipulated to allow for the smooth movement of the object through space.

By using SM-Applications, we have been able to develop high-performance connected drives without the use of expensive axis controllers. This system has been installed and put into operation at the Samara Academic Theater of Opera and Ballet.

Theather


FEATURES


• FOUR 5.5KW SERVO DRIVES
• UP TO 3 M/S TRAVEL SPEED
• TRAJECTORY DATABASE
• FULL MOTION CONTROL
• LINUX AND QT BASED