环境技术
環境技術
배경기술
ENVIRONMENTAL TECHNOLOGY
2014年
2期
5-8
,共4页
锤击法%细长体%两点激振%模态测试
錘擊法%細長體%兩點激振%模態測試
추격법%세장체%량점격진%모태측시
hammer method%slender%dual-exciter vibration%modal test
细长体进行振动试验时前后输入的试验条件差异较大，进行两点激振试验前激励点和控制点选取需要参考试验件前三阶的模态信息。对结构进行激励，测量响应的传递函数，通过计算机解算可以得出结构的基本模态信息。对试验件进行锤击是一种瞬态、宽频激励。用移动锤击法对自由状态下的细长体进行模态测试，获取了前三阶的模态信息，并根据振型的波峰和节线位置选取两点激振试验的夹具夹持位置和控制点，满足了试验控制要求。
細長體進行振動試驗時前後輸入的試驗條件差異較大，進行兩點激振試驗前激勵點和控製點選取需要參攷試驗件前三階的模態信息。對結構進行激勵，測量響應的傳遞函數，通過計算機解算可以得齣結構的基本模態信息。對試驗件進行錘擊是一種瞬態、寬頻激勵。用移動錘擊法對自由狀態下的細長體進行模態測試，穫取瞭前三階的模態信息，併根據振型的波峰和節線位置選取兩點激振試驗的夾具夾持位置和控製點，滿足瞭試驗控製要求。
세장체진행진동시험시전후수입적시험조건차이교대，진행량점격진시험전격려점화공제점선취수요삼고시험건전삼계적모태신식。대결구진행격려，측량향응적전체함수，통과계산궤해산가이득출결구적기본모태신식。대시험건진행추격시일충순태、관빈격려。용이동추격법대자유상태하적세장체진행모태측시，획취료전삼계적모태신식，병근거진형적파봉화절선위치선취량점격진시험적협구협지위치화공제점，만족료시험공제요구。
The test conditions of the head and tail of a slender varies widely in vibration test. The first three order modal results can be referenced when selecting the excitation and control location before the dual-exciter vibration test. Exciting specific location of test pieces, and measuring the transfer function of the response from exciting, the basic modal information of the structure can be calculated by computer. Hammering on the structure is a instantaneous wideband excitation. The fixture and control position is confirmed by referencing the position of modal shape peak and node lines from modal results, and meet the requirements of the control in dual-exciter vibration test.
