www.jbj.co.uk/couplings.html#flender Coupling behaviour under overload conditions Coupling behaviour under overload where the torque is considerably above the limits of use of the coupling concerned is determined by the engineering design of the coupling series. The ZAPEX,ARPEX, N-EUPEX, RUPEX and N-BIPEX coupling series can withstand overloads until the breakage of metal parts. These coupling series are designated as fail-safe. Coupling types which can withstand overload, i.e. fail-safe types, are used e.g. in crane systems. In case of coupling breakage due to overloads, the splinteringmetall parts may cause injury to persons and property damages. The N-EUPEX DS, ELPEX-B, ELPEX-S and ELPEX coupling series throw overload. The elastomer element of these couplings is irreparably damaged without damage to metal parts when subjected to excessive overload. These coupling series are designated as non-fail-safe. The types that fail can be fitted with a failsafe device. This component enables emergency operation, even after the rubber element of the coupling has been irreparably damaged. » Mass moment of inertia of the coupling halves. The details needed for calculating torsional vibration are specified in the coupling catalogue: Torsional and bending vibrations On drives which are prone to torsional and bending vibrations, measurements or calculations such as natural frequency calculations, torsional vibration simulations or bending vibration calculations are necessary. » Dynamic torsional stiffness » Damping (specification of the damping coefficient ψ or Lehr's damping D = ψ/4π). Torsional vibration excitations may occur during the starting of an asynchronous motor, during a motor short circuit or in diesel engine drives. Bending vibrations may be critical if the coupling is insufficiently balanced and/or at an operating speed close to the critical speed. The fluid couplings of the FLUDEX series withstand a load for a short time. Persistent overload causes the FLUDEX coupling to heat up beyond limits, causing the fuse to operate and so emptying the coupling and interrupting the torque transmission. The drive trainmay, depending on complexity, be regarded as a two-mass vibration-generating systemor N-mass vibration-generating system. The vibrationgenerating masses are defined by the rotating bodies and the couplings by the coupling stiffnesses and shaft stiffnesses. The effect of torsional vibration excitations on the behaviour of the system is calculated. 19 #DriveLineHarmony Environmental Conditions & ATEX Mechanical Power Transmission Couplings
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