Today, the calculating methods are actively used to study the stress-strain state (SSS) parts and assemblies structures of the aviation gas turbine engines (GTE). These methods allow to simulate virtually any shape of the object, various conditions of external influence. The accuracy of the calculations is very high and it allows to predict the reliability and durability of the parts with high probability. However, the design conditions not always assign the actual conditions of loading. It is not easy to take into account all the conditions and mechanisms of loading in the real world. So, the experimental evaluation of SSS is a mandatory requirement by such researches and tests. One of the main methods of determining the SSS of the contra-rotating fan is the strain gauge telemetry. The ordinary telemetry systems include a strain gauge fixed to the propeller blade, an amplifier and a recorder. The TILKOM’s non-contact telemetry system for strain gauges TT033 is used for contactless transmission of the signal from the strain gauge located at the rotating blade and its following converting. The telemetry system TT033 consists of a rotor, a stator, a measuring unit and the analogue decoder. The rotor with the connected sensors is fixed on the rotating part. The stator is mounted inside the rotor and is fixed on the shaft or the housing of the object. On the surface of the stator are coils. They feed the rotor and transmit the desired signal. The air gap between the stator and the rotor is 1.5 mm.
During the studying parameters of gyroplane and helicopter rotating parts is used telemetry providing non-contact transmission of measured data. An example is the TT02 telemetry. The TT02 can be used for amplifying, converting and contactless transmitting of signals. IT can support up to sevenSG full and half bridges located on the rotating gyroplane blades .
1- rotor; 2- transmitter; 3- SG bridge socket; 4- transducer power cable; 5- antenna cable; 6- power supply; 7- power switch; 9- antenna 10- receiver.
The TT033 telemetry provide the amplifying and wireless transmission of strain gauge and potentiometric signals from rotating shafts of the aircraft equipment.
It can be used for:
Recording the dynamic bending and torque moment on the rotor shaft
Strain detection on rotor blades
Vibration and force measurements on rotor blades
Customer device design is also available on request.
How to transfer the measured data from the propeller blade or the turbine? Our engeneers develop the Telemetry System TT033/5 to transfer the measured data via the rotating shaft with the diameter 210 mm. The Telemetry System TT033/5 provides the conditioning, amplification and wireless transmission to the PC up to 23 parallel strain gage bridges (half-bridges) signals from the rotating propeller parts. The Telemetry System TT033/5 takes measurements of relative strain, vibrations, torque and bending moments, forces and other parameters with the strain gauge technology.
The inner stator diameetr is 210 mm. The max outside rotor diameter is 315 mm. The width is 71mm. The scope of supply includes stator, rotor, measuring unit, special software and connecting supply. The measuring unit allows to display the measured data and transfer them via the USB interface to the PC.
During any measurements the necessity to observe rotating propeller deformation may arise. It can be done with a stroboscope. It gives you a “stop-motion effect” at the needed state for detailed research. A stroboscope consists of 4 elements: an electronic control unit, a lamp, a gear ring and a rotation speed transducer.