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            振動的能量-2019年物理復習資料-福建函授

            福建成人高考信息網www.laiwobuy.com 發布時間: 2018年12月15日


             

             振動的能量

              1、對于給定的振動系統,振動的動能由振動的速度決定,振動的勢能由振動的位移決定,振動的能量就是振動系統在某個狀態下的動能和勢能的總和.

              2、振動系統的機械能大小由振幅大小決定,同一系統振幅越大,機械能就越大.若無能量損失,簡諧運動過程中機械能守恒,做等幅振動.

              3、阻尼振動與無阻尼振動

              (1)振幅逐漸減小的振動叫做阻尼振動.

              (2)振幅不變的振動為等幅振動,也叫做無阻尼振動.

              4.受迫振動

              (1)振動系統在周期性驅動力作用下的振動叫做受迫振動.

              (2)受迫振動穩定時,系統振動的頻率等于驅動力的頻率,跟系統的固有頻率無關.

              5.共振

              (1)當驅動力的頻率等于振動系統的固有頻率時,物體的振幅最大的現象叫做共振.

              (2)條件:驅動力的頻率等于振動系統的固有頻率.

              (3)共振曲線.如圖所示.

              


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