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Aivaf selects PDU2 profile driven units for sonar exhibit

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Aivaf, a company that specialises in building interactive displays, has used a pair of HepcoMotion PDU2 profile driven units in an exhibit that demonstrates the way destroyers use sonar to find submarines.

Aivaf selects PDU2 profile driven units for sonar exhibitAs interactive exhibit specialists Aivaf Limited will attest, electro-mechanical systems for use in the public domain need to fulfil specific performance criteria: cost-efficiency, reliability and safety are, of course, high priorities. So too is the system's ability to withstand harsh treatment - and even abuse. Therefore, in selecting a linear motion system for a recent sonar exhibit, Aivaf sought one that was first and foremost highly robust. Also, to meet the design criteria, the chosen system needed to provide minimal over-run and be easily adapted to give sufficient mounting opportunity. The product that proved equal to the task was the HepcoMotion PDU2 Profile Driven Unit.

Aivaf has vast experience in designing, building and installing mechanical and electro-mechanical interactive displays that can be low-tech or highly engineered, depending on the client's needs. The company serves visitor and science centres, museums and, indeed, any themed attraction that requires an interactive display. The sonar exhibit for which the PDU2 was specified is designed to demonstrate how sonar is applied in the Navy to find ships and submarines that are not visible to the naked eye. It also illustrates what sonar is and how it works.

Having pressed the start button, the visitor moves the destroyer to where they believe the submarine to be, using sonar to assist in establishing the location. When they are satisfied with the position they press the reveal button. If the destroyer is squarely sited above the submarine they are rewarded with the sound of dropping bombs. If not, they are squirted with water!

Two HepcoMotion PDU2 units carry the destroyer and submarine the length of the exhibit. The submarine is motor-driven and takes up a random position dictated by an electro-mechanical control. The destroyer is moved manually along its linear path. Both units are fitted with single-turn absolute shaft encoders to provide positional feedback. This indicates to the control system the position of the ship in relation to the submarine, enabling it to activate sonar sounds that become more frequent as the vessels draw closer.

"To contain costs and shorten lead times we incorporate as many proprietary products as possible," comments Julie France, Aivaf's Business Development Manager. "But given the need for the system to be almost over-engineered to ensure its resistance to excessive use, we must have full confidence in these bought-in elements."

As well as the mechanical design, careful consideration needs to be given to the ergonomics of the system. The design is usually based around children of between 5 and 12 years; however, it must be suitable for all age groups. Factors such as operating height, reach and line-of-sight are all important. The PDU2's compact and uniform section and low height were helpful in this regard. "And its double shaft meant we could drive one side and encode the other," adds Julie France.

The HepcoMotion PDU2 belt-driven linear transmission has proven to be a popular, high-performance and cost-effective package for a variety of applications. Its Herculane wheel technology provides a combination of load capacity, speed and low friction that is said to be better that that offered by other similar-sized units.

"The PDU2 units have worked without failure since installation," Julie France states. "And this performance is exactly what we would expect from this product."

 
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