L型螺旋卸船机俯仰平衡系统动态特性研究
发布时间：2018-09-12 07:17
【摘要】：螺旋卸船机是在现代港口物流中应用比较广泛的一种散货卸船机械，具有卸船效率高、环境污染小、船型与货物的适用性广、重量轻、结构简单等优点。武汉理工大学研发的新型L型螺旋卸船机在取料方式、垂直螺旋中间支承方式、料流转接方式、输送机支承结构及俯仰平衡系统等方面进行了大量的技术创新，达到了提高卸船效率、降低卸船能耗的目的。 对于L型螺旋卸船机来说，俯仰平衡系统是其重要的组成部分，它的刚度和强度能否满足需要对整机的平稳运转具有很大的影响。在卸船机工作过程中，垂直与水平螺旋轴的偏心旋转将产生离心力，从而引起谐波激励使得俯仰结构产生振动，影响整机的运转。因此，有必要运用动力学的方法，对该卸船机的俯仰平衡机构进行动态特性研究，研究其在动态激励下的响应特性。 本文以螺旋卸船机的俯仰平衡系统为研究对象，以ANSYS软件为工具，以动力学理论为基础，对俯仰平衡系统的动态特性进行了分析研究，主要进行了以下方面的工作： （1）利用ANSYS软件针对L型螺旋卸船机的俯仰平衡系统建立有限元分析模型。 （2）确定俯仰平衡系统的载荷和工况，对俯仰平衡系统进行静力学分析，，为动力学分析提供数据支持。 （3）在静力分析的基础上进行模态分析，提取其前十阶固有频率及振型，为进行谐响应分析奠定基础。 （4）分析出垂直与水平螺旋由于偏心旋转引起的离心力，并将其某方向分力作为外部激励分别输入到俯仰机构的有限元模型中，研究该模型在两种不同频率的谐波激励下的稳态响应曲线，并绘制出在两种频率谐波激励下系统的动强度与动刚度云图。 （5）通过对动态响应数据的分析比较，揭示俯仰平衡系统在两种激励叠加下的的持续动力特性，从而为克服共振及谐波响应引起的不良影响提供依据。
[Abstract]:Spiral ship unloader is a kind of bulk ship unloader which is widely used in modern port logistics. It has the advantages of high unloading efficiency, low environmental pollution, wide applicability of ship type and cargo, light weight, simple structure, and so on. A new type of L-type screw ship unloader developed by Wuhan University of Technology has made a great deal of technological innovations in the aspects of material collection, vertical screw intermediate support, material flow connection, conveyor support structure and pitch balance system, etc. The efficiency of unloading is improved and the energy consumption of unloading is reduced. For L-type screw ship unloader, pitch balancing system is an important part of it. Whether its stiffness and strength can meet the needs has a great impact on the smooth operation of the whole machine. In the working process of ship unloader, the eccentric rotation of vertical and horizontal helical shaft will produce centrifugal force, which will cause harmonic excitation to make the pitching structure vibrate and affect the operation of the whole machine. Therefore, it is necessary to use dynamic method to study the dynamic characteristics of the pitching balancing mechanism of the ship unloader and its response characteristics under dynamic excitation. In this paper, the dynamic characteristics of the pitch balance system of the screw ship unloader are analyzed and studied with the ANSYS software as the tool and the dynamics theory as the foundation. The main works are as follows: (1) the finite element analysis model of the pitching balance system of L-type spiral ship unloader is established by using ANSYS software. (2) the load and working condition of the pitching balance system are determined. Static analysis of pitching balance system provides data support for dynamic analysis. (3) on the basis of static analysis, modal analysis is carried out to extract the first ten natural frequencies and modes. It lays a foundation for harmonic response analysis. (4) the centrifugal force caused by eccentric rotation of vertical and horizontal helix is analyzed, and its component force is input into the finite element model of pitching mechanism as external excitation. The steady-state response curves of the model under two harmonic excitations with different frequencies are studied, and the dynamic strength and stiffness cloud diagrams of the system under two harmonic excitations are drawn. (5) the dynamic response data are analyzed and compared. The persistent dynamic characteristics of pitching balance system under two kinds of excitation superposition are revealed so as to provide the basis for overcoming the adverse effects caused by resonance and harmonic response.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U653.928.1
本文编号：2238295
[Abstract]:Spiral ship unloader is a kind of bulk ship unloader which is widely used in modern port logistics. It has the advantages of high unloading efficiency, low environmental pollution, wide applicability of ship type and cargo, light weight, simple structure, and so on. A new type of L-type screw ship unloader developed by Wuhan University of Technology has made a great deal of technological innovations in the aspects of material collection, vertical screw intermediate support, material flow connection, conveyor support structure and pitch balance system, etc. The efficiency of unloading is improved and the energy consumption of unloading is reduced. For L-type screw ship unloader, pitch balancing system is an important part of it. Whether its stiffness and strength can meet the needs has a great impact on the smooth operation of the whole machine. In the working process of ship unloader, the eccentric rotation of vertical and horizontal helical shaft will produce centrifugal force, which will cause harmonic excitation to make the pitching structure vibrate and affect the operation of the whole machine. Therefore, it is necessary to use dynamic method to study the dynamic characteristics of the pitching balancing mechanism of the ship unloader and its response characteristics under dynamic excitation. In this paper, the dynamic characteristics of the pitch balance system of the screw ship unloader are analyzed and studied with the ANSYS software as the tool and the dynamics theory as the foundation. The main works are as follows: (1) the finite element analysis model of the pitching balance system of L-type spiral ship unloader is established by using ANSYS software. (2) the load and working condition of the pitching balance system are determined. Static analysis of pitching balance system provides data support for dynamic analysis. (3) on the basis of static analysis, modal analysis is carried out to extract the first ten natural frequencies and modes. It lays a foundation for harmonic response analysis. (4) the centrifugal force caused by eccentric rotation of vertical and horizontal helix is analyzed, and its component force is input into the finite element model of pitching mechanism as external excitation. The steady-state response curves of the model under two harmonic excitations with different frequencies are studied, and the dynamic strength and stiffness cloud diagrams of the system under two harmonic excitations are drawn. (5) the dynamic response data are analyzed and compared. The persistent dynamic characteristics of pitching balance system under two kinds of excitation superposition are revealed so as to provide the basis for overcoming the adverse effects caused by resonance and harmonic response.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U653.928.1
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本文编号：2238295
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