A method of cross-point admittance based on ambient excitation to identify large engineering structures modal parameters was reported in this paper. 摘要提出了基于環(huán)境激勵下，運用跨點(diǎn)導納法識別大型工程結構模態(tài)參數的一種方法。
Further, the current quadrilateral and admittance quadrilateral, as well as their similarity to the power quadrilateral in non-sinusoidal alternating-current circuits were derived. 由功率四邊形進(jìn)一步確立了非正弦交流電路中的電流四邊形和導納四邊形，以及它們和功率四邊形的相似關(guān)系。
