Abstract
Electronic cams are used for different manufacturing systems, but in terms of displacement diagrams, they have common characteristics. The emphasis is usually placed on maximum accuracy, minimum machine cycle time and the displacement diagram has a simple shape. This paper addresses a completely different case, which shows that the use of electronic cams is very diverse. An Omron’s electronic cam was used to control kinetic art sculptures. It was necessary to develop an implementation that would be able to accommodate a large number of very long and complex displacement diagrams. Some sculptures contained up to 147 interpolating axes and their programs took up to an hour. The proposal builds on the basic animation and designer’s demands, but it must comply with all the limits of the mechanism (maximum speed, torque, etc.). For this purpose, an independent software tool was developed. The final displacement diagram is composed from polynomial of the 5th order by defining the 0th, 1st, and 2nd derivatives at the key points. This method of design has proved to be very effective, and in addition, this implementation brought a significant saving of memory and reduction of computational complexity.
Highlights
Displacement diagrams are usually supplied by the contracting authority or generated by specialized software tools
The displacement diagrams of the kinetic sculptures are subject to different requirements in comparison to production machines
The developed method divided the displacement diagram to individual sections which are replaced by the 5th order polynomial
Summary
Displacement diagrams are usually supplied by the contracting authority or generated by specialized software tools (in VÚTS, we use our own tools KINZ [1] and KINZ2 [2]). This is a large amount of data that needs to be checked and implemented in the PLC control program. The biggest problem would be the extreme time requirement for checking and correcting data from the customer For these reasons, a specialized software tool for data preparation for kinetic sculptures was created. Before using a new displace diagram for a specific mechanism, a number of checks are required. Some mechanisms require more complicated collision control algorithms These checks will usually not pass, and minor interventions must be made in the shape of the displacement. For these corrections, polynomial implementation is very convenient. Implementation of its own general software tool was a logical process
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