Freudenberg, September 2, 2014 – Lifting equipment (http://www.haacon.de/de/hebesysteme.html) must meet stringent requirements, especially if they are intended for use in the defence sector. In order to verify compliance with the appropriate requirements, tests of mechanical properties and electromagnetic compatibility are performed.
This task may be performed only by accredited laboratories whose competence has been demonstrated by an accreditation body. The technical monitoring bodies possess appropriate testing facilities.
One of four lifting columns with identical design – constituting a set of lifting systems for a mobile radar station – is brought to the testing bench under control. The vibration and shock resistance of the components shall be verified along the three axes x-y-z in accordance with MIL-STD 810G.
Vibration test
On the x-axis – corresponding to a force acting on the longitudinal side of the functional container – the test is carried out at 2.86 times the gravitational acceleration (g). On the y-axis – corresponds to a force acting on the end faces of the functional container – the test is carried out with 1.3 g. On the z-axis, the system must withstand a vibration acceleration of 4.43 g during the entire test cycle. The z-axis is the principal loading direction along which the system lifts the container.
The test is performed in accordance with the client’s provisions with a random (non-sinusoidal) oscillation signal at frequencies between 5 – 500 Hz over a period of 32 min.
Shock test
An acceleration of 20 g is simulated in the shock test. The test sequence is equivalent to that of the EMC test. Three shocks are applied in sequence. The masses are accelerated from a uniform motion by applying a sawtooth characteristic and then decelerated with minus 20 g within 11 ms. In case of a column mass of about 180 kg, this corresponds to a resultant force of 3,600 kg. This 20-fold stress acts equally on all inner component connections, whose size has been selected accordingly.
EMC test (in accordance with MIL-STD 461F Table V / Ground Army)
The testing of electrical noise immunity (EMC test) is used to prove the fault-free interaction of an electronic component, a device or a system with its electromagnetic environment. The electrical components themselves may not emit any electromagnetic waves that are not allowed.
The legal guidelines as well as manufacturer-specific requirements apply as the basis of these tests. Only a few specialists who have the necessary equipment are available for this test. In contrast to the mechanical testing, the complete set-up, including the load and all four lifting columns must be ready in the testing room. The testing period of this extensive testing spans several days.
The test also includes emission tests or electromagnetic interference tests. The limits may not be exceeded and the guided and radiated interference emissions may not occur during the measurement.
Susceptibility tests or resistance tests are also done. In this case, no damage to the EUT (Equipment Under Test) or a failure of components may occur.
Unintended movement of the columns during the standby state is just as rare as an effect due to lifting or lowering of the container.
The EMC test report of the entire test procedure, including the issued certificate will be provided to the client in German and English.
For text copy and pictures please visit http://www.fuchs-pressedienst.de
haacon ist ein führendes Unternehmen mit Spezialisierung auf Hebesysteme für mobile Anwendungen. Entwickelt und produziert werden Spindelstützen, Elektroseilwinden, Nivelliervorrichtungen, Verladesysteme, Verstelleinrichtungen. Mit rund 160 Beschäftigten setzte die haacon-Gruppe im Jahr 2013 über 20 Mio. Euro um.
Firmenkontakt
haacon hebetechnik gmbh
Herr Erich Münkel
Josef-Haamann-Str. 6
97896 Freudenberg/Main
(0 93 75) 84 40
muenkel@haacon.de
http://www.haacon.com
Pressekontakt
Fuchs Pressedienst und Partner
Herr Franz Fuchs
Narzissenstr. 3b
86343 Königsbrunn
08231-6093536
info@fuchs-pressedienst.de
http://www.fuchs-pressedienst.de
