Due to their extremely compact and short design and extremely high torsional stiffness, the so-called torque flanges based on strain gage technology are the most up-to-date devices used for in-line torque measurement in power test stands. The optimum transfer of the measure and torque into the shaft line is an important factor for a correct measurement of torque. Due to the compact and stiff design of the torque flanges some basic points must be taken into account. This paper describes specific factors affecting the measurement uncertainty and their reasons. It includes recommendations on how to avoid or minimize these effects in order to achieve optimum comparabilities, especially with respect to the sensitivity and the measuring characteristics. In addition, a new design principle is introduced which is less sensitive to the described effects.
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