18 Demarcation for the Coupling Strength in the MODENA Approach 195 2. When < 0.1, the coupling is weak and exact results can be acquired even when the injected power is calculated approximately; when > 1, the coupling is strong and the approximation on calculation of the injected power will result in large errors in the predicted system energy responses; when 0.1 < < 1, it may be regarded as weak coupling for the directly excited oscillator and strong coupling for the indirectly excited oscillator. 3. If the coupling strength is weak, i.e. < 0.1, the injected power can be calculated approximately to improve computational efficiency; otherwise, it should be calculated exactly to decrease analysis error. 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