论文部分内容阅读
在长期服役过程中,海洋平台吊机处于十分恶劣的环境,服役吊机结构容易受到由老龄化引起的功能退化,如腐蚀损耗、疲劳裂纹或局部凹陷等,影响其安全使用。根据现场实际测绘的吊机数据,应用有限元软件Ansys对其建立有限元模型。得到了吊机的应力分布云图,指出了其应力较大部位,对这些区域进行了现场应力测试。并将有限元的计算结果与测试结果进行了比较,除测点1 941外,其余测点相差在14%以内。最危险区域应力值为247.96 MPa小于吊机材料的许用应力,满足强度要求。分析吊机关键部位应力变化与起升角度β的关系,当起吊重物接近最大工作载荷时,建议选取在β>15°的情况下工作。
In the course of long-term service, the offshore platform crane is in a very harsh environment. The service crane structure is susceptible to the deterioration of functions caused by aging, such as corrosion loss, fatigue cracks or partial depression, affecting its safe use. According to the crane data of the actual surveying on the spot, finite element software Ansys was used to establish the finite element model. The stress distribution of the cranes is obtained, the stress is pointed out, and the stress in these areas is tested. The results of finite element calculation are compared with those of the test results. Except for the test point of 1 941, the difference of other test points is within 14%. The stress of the most dangerous area is 247.96 MPa, which is less than the allowable stress of crane material to meet the strength requirements. Analysis of the key parts of the crane stress changes and lifting angle β relationship, when the lifting weight close to the maximum working load, it is proposed to select the case of β> 15 °.