例a1(0)=6√/2cos314+30)V U1=6∠30°V 2()=42cos(314r+60°)V U2=4∠60°V U=U1+U2=6∠30+4∠60=5.19+j3+2+j3.46 7.19+j6.46=964∠419°V ∴以()=u1(t)+n2()=9642cos(314+49°)V 也可借助相量图计算 首尾相接 U U 60 41.9 41.9 30 Re 30 Re 60例 ( ) 4 2cos(314 60 ) V ( ) 6 2cos(314 30 ) V o 2 1 = + = + u t t u t t  也可借助相量图计算 4 60 V 6 30 V o 2 o 1 =  =  U U   ( ) ( ) ( ) 9.64 2cos(314 41.9 ) V o u t = u1 t + u2 t = t +      6 30 4 60 U = U1 +U2 =  +  Re Im  30 U1   41.9 U  Re Im  41.9  30 U1   60U2  U  = 5.19 + j3 + 2 + j3.46 = 7.19 + j6.46 9.64 41.9 V o =   60 U2  首尾相接