Flight Simulator Positioning (LVDT Transducer)

Hydraulic cylinders for positioning the cell of flight simulators require fast and reliable position feedback of the shaft for dynamic control. In combination with a suitable proportional valve, a hydraulic cylinder can be upgraded to a positioning drive that can generate high acceleration forces on the cell of the flight simulator. Inductive sensors with pressurized housings up to more than 400 bar are used for position monitoring and controlling and are integrated into the cylinder body. The inductive displacement transducers (LVDT linear variable differential transformer), supply the absolute position value of the cylinder and the position of the cell of the flight simulator in the respective axis with highest accuracy and very dynamically.

 

Flight simulator with hydraulic actuators and cylinder travel measurement

Sectional view of hydraulic cylinder with integrated inductive displacement transducer

Shaft displacement at the gearbox test bench (Eddy Current Probe)

• Contactless motion detection of the differential wheel in axial and radial direction. Design and replacement of the standard sheet metal differential cover by a milled aluminium cover for vibration-free recording of the eddy current probes for the differential wheel.
• Measurement of the axial and radial shaft displacement of the protruding gear shafts behind the bearing shield as well as the flexing of the gear input shaft. Construction of the sensor mounts, measuring surface targets and base frame between cover and housing to create more space.
• Measurement data acquisition with a resolution of 1µm and a dynamic range of 10kHz. Installation of the sensor system in the test sample, calibration, trial operation and transfer to the test bench.

Gearbox view incl. eddy current probes (without differential cover)

 

Stroke Measurement in Material Testing Machine

Material testing machines apply load to a test sample until it breaks and record the force-deflection graph for material characterisation during deformation. The machine itself consists of a stable frame with base structure and has fixed and movable parts. In between is the test sample. A spindle or hydraulic cylinder with a punch acts on the moving part and applies a defined increasing force to the test sample until it breaks. At the moment of fracture, the forces released act as a shock to the entire system and cause strong mechanical stress on the measuring systems.

Concrete test sample after fracture in material testing machine