CAJ | 학술논문

为了研究结合面非线性特性对机械结构动态性能的影响，利用有限元分析软件，以组合梁结合面为研究对象，首先进行了考虑结合面非线性特性的非线性预应力模态分析，证明了结合面非线性特性对组合梁各阶弯曲振动固有频率有重要影响；然后采用单变量法研究了结合面法向载荷和摩擦系数对组合梁振动特性的影响。研究表明：结合面的法向载荷和摩擦系数都会使组合梁的固有频率降低，其中摩擦系数占主导地位。摩擦系数对组合梁低阶固有频率影响较小，高阶时影响较大。最后进行模态试验验证，实验表明：模态试验所得组合梁弯曲振型与非线性预应力模态分析法所得振型相吻合，且二者所得固有频率之间的误差在接受范围之内，从而证明了非线性预应力模态分析的可行性。
위료연구결합면비선성특성대궤계결구동태성능적영향，이용유한원분석연건，이조합량결합면위연구대상，수선진행료고필결합면비선성특성적비선성예응력모태분석，증명료결합면비선성특성대조합량각계만곡진동고유빈솔유중요영향；연후채용단변량법연구료결합면법향재하화마찰계수대조합량진동특성적영향。연구표명：결합면적법향재하화마찰계수도회사조합량적고유빈솔강저，기중마찰계수점주도지위。마찰계수대조합량저계고유빈솔영향교소，고계시영향교대。최후진행모태시험험증，실험표명：모태시험소득조합량만곡진형여비선성예응력모태분석법소득진형상문합，차이자소득고유빈솔지간적오차재접수범위지내，종이증명료비선성예응력모태분석적가행성。
In order to consider the influence of nonlinear characteristics of a joint surface on the dynamic characteristics of a whole machine,a composite beam was taken as a study object,and the nonlinear pre-stressed modal analysis method was used based on ANSYS.The nonlinear characteristics of its joint surface were proved to have an important influence on the bending natural frequencies of the composite beam.Moreover,the influence of normal load and friction coefficient of the joint surface on the natural frequencies was studied with the single variable method.The results showed that the natural frequencies of the beam decrease due to normal load and friction coefficient,and friction coefficient is dominant.Finally,the modal test was conducted.It was shown that the modal shapes of the composite beam obtained from the modal test are coincided with those gained from the nonlinear pre-stressed modal analysis;the error between the corresponding natural frequency obtained from the two cases is in an acceptable range.The results proved the feasibility of the nonlinear pre-stressed modal analysis method.