CAJ | 학술논문

针对双拉杆起重臂的平面外稳定性分析问题，提出了一种解析方法。该方法考虑拉杆固支点侧向柔性对臂架稳定性的影响，引入无量纲侧向刚度系数表征固支点对臂架牵索的侧向约束，由临界状态臂架变形微分方程导出臂架平面外失稳特征方程及其临界力，解析结果与ANSYS数值结果完全吻合。文中还进一步探讨了在固支点侧向刚度两种极限情况下以及双拉杆起重臂向单拉杆退化时失稳特征方程的表达形式，分析了固支点侧向刚度对臂架稳定性的影响。结果表明，适度增大吊臂固支点侧向刚度可显著提高起重臂的稳定承载能力，但刚度增大到一定程度时，固支点侧向刚度对臂架稳定性的影响趋于平稳。
침대쌍랍간기중비적평면외은정성분석문제，제출료일충해석방법。해방법고필랍간고지점측향유성대비가은정성적영향，인입무량강측향강도계수표정고지점대비가견색적측향약속，유림계상태비가변형미분방정도출비가평면외실은특정방정급기림계력，해석결과여ANSYS수치결과완전문합。문중환진일보탐토료재고지점측향강도량충겁한정황하이급쌍랍간기중비향단랍간퇴화시실은특정방정적표체형식，분석료고지점측향강도대비가은정성적영향。결과표명，괄도증대조비고지점측향강도가현저제고기중비적은정승재능력，단강도증대도일정정도시，고지점측향강도대비가은정성적영향추우평은。
Proposed in this paper is an analytical method for the out-of-plane stability analysis of crane jib with double rods.In this method, the effect of lateral flexibility of the fixed joint on the jib stability is considered , and a dimensionless lateral stiffness coefficient is introduced to measure the lateral constraint .Then, by establishing the deformation differential equation in the critical state , the characteristic equations of out-of-plane instability and the corresponding critical force are deduced .It is found that the analytical results are completely consistent with the ANSYS simulation results .Moreover , the expressions of the characteristic equations , respectively in two limited lateral stiffness conditions of the fixed joint and in the degradation case of the jib to single rod , are discussed , and the influence of lateral stiffness of the fixed joint on the stability of the jib is analyzed .The results show that a suit-able increment of the lateral stiffness may significantly improve the stability of the jib until the lateral stiffness rea -ches a certain value .