Hexapod test rig


Marketing/Sales, contact details:

  +49 (0) 9771 68877-500

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Customer-specific design:

FGB designs hexapods according to individual customer requirements, which allow the user to stress components and groups of components with multiaxial loads occurring in realistic applications. This customer-specific design ensures the production of test beds which optimally match each application.

The hexapod issue is completely re-interpreted by FGB with this illustrated concept, as it meets the increasing requirements for dynamics and flexibilityon the market at its best – without affecting precision. In principle, thehexapod is suited for different test scenarios with 6 degrees of freedom.

Technical data (for the illustrated design):

Platform travel: [X,Y,Z]

+/- 150mm


Platform angle: [X,Y,Z]

+/- 5 degrees


Single force acting on the platform: [X,Y]



Single force acting on the platform: [Z]



Single torques acting on the platform: [Mx,My,Mz]

approx. 40kNm


Platform speed: [Z] constant stimulation / sine

0,6 m/s


Platform speed: [Z] short-term via memory / sine

1 m/s


Platform acceleration: [Z] short-term via memory / sine



Max. operating frequency:



Hydraulic oil supply:

750 l./min – 280 bar


Oscillating base:

300 t



 Distance / Force

Hexapod-specific components

In order to meet the high requirements in dynamics at an ideal overall rigidityand lowest inertia possible of the hexapod system, FGB developed specialgimbal mounted foot links, which supply the fully hydrostatic cylinders withoil without using a hose. As a result it is possible to free the cylinders fromdisruptive hose pulsations and hose towing powers and also to prevent thecylinders from rotating around their own piston rod axis. This way it was alsopossible to minimize the inertia influence of the cylinder weight because thesingle center of gravity could be incorporated close to the pivot point of thefoot link due to the cylinder joint design.

The high performance standard of our hexapods is the result of theseinnovative test bed details.

Control system

The hexapod can be controlled both by force and distance and allows forthe shock-free switching between both operating modes. Moreover, thecomprehensive test software package includes an iterative control modewhich takes extensive non-linear material behavior into account.

The hexapod includes a hybrid force/distance decoupling system so that theuser is able to define distance or force parameters for the test in every directionof a free definable test species coordinate system. The implementation uponthe individual hydraulic cylinders is realized within the internal softwarewithout the user having to intervene.

The function software MOSA control realizes the iterative adaption control,the nonlinear iterative adaption control as well as the operation of the test bedin the control mode pseudo force control. All signals refer to the respectivecoordinate system of the test specimen defined in the basic software.