Screw pumps stay quiet at the opera
A
JBJ Techniques product story
Edited by the Engineeringtalk editorial team
Jul 24, 2000
An unusual application of hydraulics is to be found at the Theater an der Wien, Vienna, Austria, which is showing the Operetta "Elisabeth".
An unusual application of hydraulics is to be found at the Theater an der Wien, Vienna, Austria, which is showing the Operetta "Elisabeth".
The demands of this musical have made it necessary to arrange for the stage to move during the performance and hydraulic actuators have been selected because of their low noise during operation.
The stage is made up of a circular area which rotates.
It is also divided onto eight independently moving mobile boards which can move up and down by 3m from the neutral axis, as well as being able to rotate about their centre axis.
Intriguingly, although the movements of the boards can be controlled automatically, the intention is not for them predetermined prior to the performance, but decided upon live by the assistant director during the play, who controls the whole operation from a control console using a special program written by a consulting company.
The movement of each individual board is controlled by a PC that directly controls the hydraulic system.
Each of 16 actuators has a 6m stroke length.
The speed is programmable between zero and 0.5m/s.
Underneath the stage two Seim E4 screw pumps have been installed.
The working conditions are 8 bar (max) and 2900 rpm.
Because of the very low noise characteristics of these pumps, no insulating system is needed, as would have been the case, claims SEIM, with gear or vane pumps, which would therefore have been the more expensive option to achieve a similar noise level.
The hydraulic circuit also contains six proportional valves, six positioning valves, six pressure limiting valves, six safety valves and six combination solenoid valves.
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