Structure CAD äëÿ “×ÀÉÍÈÊΔ

       

Ãàðìîíè÷åñêîå âîçáóæäåíèå


                Äëÿ ãàðìîíè÷åñêîé íàãðóçêè P(1)icosqt + P(2)isinqt ñóììàðíûå ïî âñåì ó÷èòûâàåìûì ôîðìàì ñîáñòâåííûõ êîëåáàíèé èíåðöèîííûå ñèëû S1 è S2, ñîîòâåòñòâóþùèå êîñèíóñîèäàëüíîé (äåéñòâèòåëüíîé) è ñèíóñîèäàëüíîé (ìíèìîé) ñîñòàâëÿþùèì, îïðåäåëÿþòñÿ ôîðìóëàìè

                                                     S1 =

MYi,            S2 =
MYi,                                                                       (19.40)

ãäå êîýôôèöèåíòû

                                                        ai = (P(1)i c - P(2)ixai)/(c2i + a2i),                                                                 

                                           bi

= (P(2)i c - P(1)ixai)/(c2i + a2i),                                                                

                                                ai = q/wi,     ci = 1 - a2i.                                                                                  (19.41)

Ìàêñèìàëüíûå çíà÷åíèÿ îïðåäåëÿþòñÿ êàê

                                                                           S = (S12 + S22)1/2.                                                                                             (19.42)

 òåõ ñëó÷àÿõ, êîãäà ÷àñòîòà âîçìóùàþùåé íàãðóçêè q áîëüøå îäíîé èëè íåñêîëüêèõ ñîáñòâåííûõ ÷àñòîò ñèñòåìû wi, íåîáõîäèìî äîïîëíèòåëüíî ïðîâåðèòü ñèñòåìó íà ïðîõîæäåíèå ÷åðåç ðåçîíàíñ âî âðåìÿ ïóñêà èëè îñòàíîâêè ìàøèí è àãðåãàòîâ, ðàçâèâàþùèõ ãàðìîíè÷åñêóþ íàãðóçêó (ñì. [5, ñòð.53]).



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