FGB produces hexapods to individual specifications that allow the user to subject parts and components with realistic multiaxial loads. Thanks to the customised approach, test benches are created that are ideally suited for the respective application purpose.
The concept presented here interprets the FGB hexapod topic in a completely new way. This allows us to meet the increasingly stringent rigidity and durability demands by the market as the basis for the high level of precision. In principle, the hexapod is flexible and can be used for various test scenarios with 6 levels of freedom.
Platform paths: [X, Y]
X ± 150 mm; Y ± 150 mm
Platform paths: [Z]
Z ± 150 mm
Platform angle: [φX, φY, φZ]
Single force on the platform: [Z]
Single force on the platform: [X]
Single force on the platform: [Y]
Single torques on the platform: [MX, MY]
Single torques on the platform: [MZ]
Platform speed: [Z] continuous excitation / sine
Pressure oil supply:
250 ltr./min. – 280 bar
Work frequency max:
0 – 30 Hz
To meet the high requirements relating to dynamics coupled with optimum overall rigidity and the lowest possible inertia of the hexapod system, FNG has developed special cardanic foot and head joints that supply the fully hydrostatic cylinder with oil without hoses. This means that the cylinders are not affected by the interfering hose pulsations nor the hose drag; also, the cylinders are prevented from swinging around their piston rod axis. This also allows the inertia influence of the cylinder mass to be kept low, because it can be installed close to the pivot point of the foot joint thanks to the compact cylinder joint design. The high-performance standard of our hexapods is the result of the innovative details of the test bench.
The hexapod can be operated in a force and path-regulated manner and allows impact-free switching between operating modes. Also, the extensive test software package contains an iterative control mode in which heavily non-linear material behaviour is considered.
The hexapod contains a hybrid force/path decoupling control so that the user can define path or force specifications for the test in every room direction of a freely definable test body coordinate system. Implementation on the individual hydraulic cylinder is carried out in the software without the user having to intervene.
The function software MOSA-Control realises the iterative duplication control, the non-linear iterative duplication control and operation of the test bench in the Pseudo-Force-Control mode. All signals refer to the test body coordinate systems defined in the basic software.