ＦｒｅｅｖｉｂｒａｔｉｏｎｏｆａｎａｘｉａｌｌｏａｄｅｄｖｉｓｃｏｅｌａｓｔｉｃＴｉｍｏｓｈｅｎｋｏｂｅａｍ

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (7) : 95-98.

论文

ＦｒｅｅｖｉｂｒａｔｉｏｎｏｆａｎａｘｉａｌｌｏａｄｅｄｖｉｓｃｏｅｌａｓｔｉｃＴｉｍｏｓｈｅｎｋｏｂｅａｍ

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Abstract

Ｔｈｅｎａｔｕｒａｌｆｒｅｑｕｅｎｃｉｅｓ，ｍｏｄｅｓａｎｄｄｅｃｒｅｍｅｎｔｃｏｅｆｆｉｃｉｅｎｔｓｏｆａＫｅｌｖｉｎｖｉｓｃｏｅｌａｓｔｉｃＴｉｍｏｓｈｅｎｋｏｂｅａｍ
ｗｉｔｈｔｗｏｔｙｐｉｃａｌｂｏｕｎｄａｒｙｃｏｎｄｉｔｉｏｎｓｉｎｃｌｕｄｉｎｇｃｌａｍｐｅｄｃｌａｍｐｅｄａｎｄｐｉｎｎｅｄｐｉｎｎｅｄｓｕｆｆｅｒｉｎｇａｘｉａｌｔｅｎｓｉｏｎｗｅｒｅ
ｉｎｖｅｓｔｉｇａｔｅｄｂｙｕｓｉｎｇｔｈｅｃｏｍｐｌｅｘｍｏｄａｌａｎａｌｙｓｉｓａｐｐｒｏａｃｈ．Ｔｈｅｏｒｔｈｏｇｏｎａｌｉｔｙｃｏｎｄｉｔｉｏｎｓｏｆｍｏｄｅｆｕｎｃｔｉｏｎｓｗｅｒｅｄｅｒｉｖｅｄ
ｆｒｏｍｔｈｅｅｑｕａｔｉｏｎｓｏｆｍｏｔｉｏｎ．Ｔｈｅｅｆｆｅｃｔｓｏｆｓｏｍｅｐａｒａｍｅｔｅｒｓ，ｓｕｃｈａｓ，ｌｅｎｇｔｈｔｏｄｅｐｔｈｒａｔｉｏ，ａｘｉａｌｌｏａｄａｎｄｃｏｅｆｆｉｃｉｅｎｔｓｏｆ
ｖｉｓｃｏｅｌａｓｔｉｃｉｔｙｏｎｔｈｅｆｒｅｑｕｅｎｃｉｅｓ，ｄｅｃｒｅｍｅｎｔｃｏｅｆｆｉｃｉｅｎｔｓａｎｄｍｏｄｅｓｗｅｒｅｅｘａｍｉｎｅｄ，ｒｅｓｐｅｃｔｉｖｅｌｙ，ｗｈｉｌｅｏｔｈｅｒｐａｒａｍｅｔｅｒｓ
ｗｅｒｅｆｉｘｅｄｉｎｓｅｖｅｒａｌｎｕｍｅｒｉｃａｌｅｘａｍｐｌｅｓ．Ｉｔｗａｓｓｈｏｗｎｔｈａｔｔｈｅｎａｔｕｒａｌｆｒｅｑｕｅｎｃｉｅｓｏｆｔｈｅｂｅａｍｇｒｏｗｗｉｔｈｉｎｃｒｅａｓｅｉｎａｘｉａｌ
ｔｅｎｓｉｏｎ，ｍｅａｎｗｈｉｌｅｔｈｅａｍｐｌｉｔｕｄｅｓｏｆｔｈｅｍｏｄｅｆｕｎｃｔｉｏｎｓｄｒｏｐ，ｔｈｅｃｈａｎｇｅｓｏｆｔｈｅｄｅｃｒｅｍｅｎｔｃｏｅｆｆｉｃｉｅｎｔｓａｒｅｎｏｔｏｂｖｉｏｕｓ．
Ｔｈｅｅｆｆｅｃｔｏｆｉｎｃｒｅａｓｅｉｎｖｉｓｃｏｅｌａｓｔｉｃｉｔｙｃｏｅｆｆｉｃｉｅｎｔｏｎｔｈｅｎａｔｕｒａｌｆｒｅｑｕｅｎｃｉｅｓａｎｄｔｈｅａｍｐｌｉｔｕｄｅｓｏｆｔｈｅｍｏｄｅｆｕｎｃｔｉｏｎｓｉｓ
ｓｍａｌｌｅｒ，ｂｕｔｔｈｅｄｅｃｒｅｍｅｎｔｃｏｅｆｆｉｃｉｅｎｔｓｇｒｏｗａｐｐａｒｅｎｔｌｙ．