水润滑螺旋阶梯腔艉轴承的振动特性
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摘要
为了解决瞬态振动试验成本高、周期长的问题,采用正交试验法,基于Ansys模态和瞬态分析,提出一种准确测量艉轴承共振时真实位移和应力的方法。首先,运用有限元模态分析对艉轴承低阶固有频率以及振型进行数值仿真;其次,将得到的固有频率间接耦合到艉轴承激励频率,使之达到共振频率;最后,分析这种状态下的动态接触对轴瓦的影响。结果表明:艉轴承结构参数对模态的影响因子排序为螺旋角>腔数>腔长>深浅腔比例;位移响应最大值出现在轴向封油面末端,接触应力响应最大值出现在沟槽与腔体周向封油面边缘处。
In order to solve the problem of high cost and long period of transient vibration experiments, by using orthogonal test method and based on the ANSYS modal analysis and transient analysis, a method to obtain the true values of displacement and stress during the stern bearing resonance is proposed. Firstly, the finite element modal analysis is used to simulate the low-order natural frequency and vibration mode of the stern bearing. Secondly, the natural frequency is indirectly coupled to the stern bearing excitation frequency so that it reaches the resonance frequency. Finally, the impact of dynamic contact on the liner of bearing under this status is analyzed. The results show that the influence factors of the bearing structure parameters on the modal state are helix angle>cavity number>cavity length>ratio of depth to shallow cavity. The maximum displacement response occurs at the end of the axial seal face, and the maximum contact stress response occurs at the edge of the groove and the circumferential sealing surface of the cavity.
In order to solve the problem of high cost and long period of transient vibration experiments, by using orthogonal test method and based on the ANSYS modal analysis and transient analysis, a method to obtain the true values of displacement and stress during the stern bearing resonance is proposed. Firstly, the finite element modal analysis is used to simulate the low-order natural frequency and vibration mode of the stern bearing. Secondly, the natural frequency is indirectly coupled to the stern bearing excitation frequency so that it reaches the resonance frequency. Finally, the impact of dynamic contact on the liner of bearing under this status is analyzed. The results show that the influence factors of the bearing structure parameters on the modal state are helix angle>cavity number>cavity length>ratio of depth to shallow cavity. The maximum displacement response occurs at the end of the axial seal face, and the maximum contact stress response occurs at the edge of the groove and the circumferential sealing surface of the cavity.
引文
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[9]刘文玺,周其斗.尾轴承橡胶硬度对螺旋桨横向激振力引起艇体结构振动与声辐射特性的影响[J].兵器装备工程学报, 2017, 38(7):25-30.
[10]武星宇,纪刚,周其斗,等.轴-艇耦合系统的力传递特性分析[J].舰船科学技术, 2017, 39(13):65-68.
[11]李小军,朱汉华,秦源,等.船舶后尾轴承支承刚度对轴系回旋振动影响[J].武汉理工大学学报(交通科学与工程版), 2018, 42(2):274-277.
[2]戴天熙.基于有限元的船舶阻尼型水润滑尾轴承减振与疲劳研究[D].武汉:武汉理工大学, 2013.
[3]郭蕊.水润滑橡胶合金轴承振动噪声刚柔耦合分析[D].重庆:重庆大学, 2014.
[4]方建忠.规则波浪载荷下大型船舶推进轴系振动研究[D].武汉:武汉理工大学, 2014.
[5]夏极,蔡耀全,刘金林,等.轴承油膜动力特性系数对轴系回旋振动影响[J].舰船科学技术,2016,38(1):62-66.
[6]覃文源,覃会,郑洪波,等.轴承摩擦力作用下弹性支承轴系自激振动特性研究[J].振动与冲击, 2017, 36(17):187-194.
[7]董良雄,张涛,温小飞,等.船舶艉部结构对尾轴振动特性影响研究[J].船舶工程, 2016, 38(10):72-75.
[8]王正兴,周瑞平,林晞晨,等.基于有限元法的推进轴系回旋振动计算研究[J].船舶工程, 2016, 38(11):52-57.
[9]刘文玺,周其斗.尾轴承橡胶硬度对螺旋桨横向激振力引起艇体结构振动与声辐射特性的影响[J].兵器装备工程学报, 2017, 38(7):25-30.
[10]武星宇,纪刚,周其斗,等.轴-艇耦合系统的力传递特性分析[J].舰船科学技术, 2017, 39(13):65-68.
[11]李小军,朱汉华,秦源,等.船舶后尾轴承支承刚度对轴系回旋振动影响[J].武汉理工大学学报(交通科学与工程版), 2018, 42(2):274-277.