A Moving Performance from Hydraulics  

Oleh:

Korane, Kenneth J.

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 81 no. 19 (Oct. 2009), page 24.
Topik: Hydraulics; Cylinder; Synchronization

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Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44.60 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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One example is the raising and lowering of a whole scenery room as a live audience looks on during the Tony award-winning Broadway show Billy Elliot. The show is about a coal-miner’s son who wants to be a ballet dancer, so graceful and fluid motion is essential for the scenery. The set requires two hydraulic linear actuators, explains Chuck Adomanis, automation department head of Hudson Scenic Studio, Yonkers, N. Y. One is a large lift at center stage that raises and lowers Billy’s house. The second cylinder mounts to the house and moves a bed. At times, the house lowers into the floor while the bed extends at precisely the same rate and appears to hover motionless in the air. Because such movements involve close synchronization, the Hudson team selected an RMC75 two-axis motion controller with Ethernet communications and special capabilities for precisely controlling hydraulics. It’s built by Delta Computer Systems of Battle Ground, Wash. String potentiometers that unfurl as the piston rods extend connect to quadrature encoders that send cylinder-position information to the controller. And to ensure accurate closed-loop positioning, the RMC75 interfaces directly with the unit’s servovalves.

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