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Check At High-end Level

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Check At High-end Level
Check At High-end Level

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For us, the fascinating thing about test benches is the variety of tasks,”explains Robert Käch. The managing director of

Ölhydraulik Hagenbuch explains why: "Position, force, pressure and temperature, to name just a few sizes, must be precisely mastered in order to simulate the real stresses on components on the test bench". In order to solve this task, the company has developed a number of modules in recent years, including a high-performance shaker, which is an ideal drive concept for test benches.

From hydraulic engineers to system manufacturers

The development of the shaker exemplifies the development of the company from "hydraulics to system builders", as Käch summarizes. Hydraulic drives are complex systems that, in addition to high-quality components, also require sophisticated mechanics and well-thought-out controls. "In order to meet the demand for total solutions, we built up our own development and, in addition to the production of components and assemblies, we also specialize in the areas of mechanics, electrics and control," says Robert Käch.

The construction of test benches is considered a high-end segment of hydraulic drive technology. "With the high-performance shaker, we are pushing the limits of classic hydraulic shakers further," emphasizes Käch. The drives now allow frequencies up to 600 Hz, peak accelerations up to over 250 g and with payloads of up to 50 kg, properties that are particularly in demand in the automotive and aeronautical engineering testing areas.

In use: high-tech materials

The drives are completely hydrostatically supported. That means the piston always floats on an oil film. This significantly reduces friction and, above all, there is no annoying stick-slip effect. "With such high accelerations, the moving mass is crucial," explains Robert Käch. "So that as little dead weight as possible has to be moved and the force benefits the payload as much as possible, we used high-tech materials from the aerospace industry for all moving parts."

But good mechanics are not enough. "Very fast controls and software with a lot of functionality and interfaces are also necessary," emphasizes Käch. The heart of the controller is therefore a Power PC CPU with a clock rate of 1 GHz and 256 MB RAM. Together with a very fast bus system (Ginlink) - as with a PLC - almost any number of interfaces for signals of all kinds can be integrated. The data transfer enables sampling rates of up to 16 kHz for the control.

Interfaces to the outside world

The basic package of the shaker already offers many testing and application options, and interfaces also make it possible to use control systems that have already established themselves on the market.

Typical applications for the high-performance shaker are, for example, drive files, i.e. free motion profiles that can be used to simulate real loads on components via the cylinder. Another typical application is sweep profiles, which are used to examine the behavior of components in all frequency ranges.

Additional information on solutions with oil hydraulics

The company Ölhydraulik Hagenbuch (OHE) AG, founded in 1955, is a traditional Swiss family company from Ebikon in the canton of Lucerne. Around 50 employees focus on drive technology using oil hydraulics, supplemented by mechanics, controls and software. The company supplies both individual components and complete systems. The portfolio includes the design of robust and reliable hydraulic cylinders for universal use in hydraulic systems, servo cylinders and other special designs. The company's hydraulic power units are amazingly quiet and can also be customized.

Partner for total solutions

When building test benches, Ölhydraulik Hagenbuch also sees itself as a partner for total solutions. "It starts with the feasibility check, goes through the development and commissioning of the test bench and ultimately leads to the partner accompanying the customer during the operation," concludes Käch. (ud)

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