泥浆泵舱顶部甲板减振研究

以某平台泥浆泵舱顶部甲板为研究对象,利用数值计算和振动测试结合的方法对其减振方案进行研究。设置两种泥浆泵运行工况,利用振动分析仪测量甲板上表面8个高振动测点的振动速度。利用有限元方法建立顶部甲板模型,通过模态分析和谐响应分析得到顶部甲板的前五阶固有频率和各测点振动速度-转速曲线。振动响应数值计算结果和测试结果吻合,验证数值模型可靠性。分析发现顶部甲板固有频率远离激励频率,结构振动属于强迫振动,主要由泥浆泵输出管系的管托固定在刚度较弱的顶部甲板纵骨引起。甲板振动速度不符合规范要求,因此提出两种增加刚度的减振措施。通过谐响应分析重新计算测点的振动速度响应,结果满足规范要求。研究结果为船体局部结构设计和减振设计提供参考。

Vibration Reduction Analysis of OP Deck of Mud Pump Tank

The top deck of a ship"s mud pump tank was taken as the research object, and its vibration Reduction were studied by combining numerical calculation and vibration testing. Two operating cases of mud pumps were set. Vibration analyzer was used to measure the vibration velocity response of eight high vibration measuring points on deck. The model of top deck was built by finite element software ANSYS. The first five order natural frequencies of local structures and vibration velocity-rotational speed curves of high vibration measuring points were solved by modal and harmonic response analysis respectively. The numerical results of vibration response agree with the test results and the correctness of the model was verified. Analysis conclude that the natural frequencies are far away from the excitation frequency, so the deck vibration is forced vibration, it is mainly caused by the pipe support of the mud pump output pipe system fixed on the longitudinal bone of the upper deck with weak rigidity. The vibration velocity of top deck does not meet the specification requirements, so two vibration reduction measures for increasing stiffness are proposed. The vibration velocity response of the measuring points after structural modification is recalculated through harmonic response analysis and the results satisfy the standard request. The research provides references for the design of local structure and vibration reduction of hull.