www.jbj.co.uk/couplings.html#flender 35 #DriveLineHarmony ELPEX Series Design & Configurations Highly Flexible Couplings Torsional stiffness and damping 20% 50% 60% 70% 80% 100% 200% Permitted shaft misalignment With flexible couplings the manufacturing process of the rubber elements and their aging primarily influence the stiffness value CTdyn. For this reason calculationmust bemade with a tolerance for the dynamic stiffness of ±20%. The permitted shaft misalignment depends on the operating speed. As the speed increases, lower shaft misalignment values are permitted. The correction factors for different speeds are specified in the following table. Correction factor FKV 1.6 1.25 1.0 0.7 The damping coefficient is Ψ = 1.1 Themaximum speed for the respective coupling sizemust be noted! Torsional stiffness also depends on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request. Correction factor FKC 0.3 0.56 0.65 0.74 0.82 1 1.9 The specified damping coefficient Ψ is a minimum value with the result that the damping performance of the coupling corresponds at least to the specified value. Load TN / TKN C = C • FKC Tdyn Tdyn 1000% The dynamic torsional stiffness is load-dependent and increases in proportion to capacity utilization. The values specified in the selection table apply to a capacity utilization of 100%. The following table shows the correction factors for different rated loads. ΔK = ΔK • FKV perm 1500 Speed in rpm 500 1000 1500 3000
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