L型螺旋卸船机垂直输送机结构振动特性研究

发布时间：2018-05-01 07:15

本文选题：螺旋卸船机 + 垂直输送机　；参考：《武汉理工大学》2014年硕士论文

【摘要】：螺旋卸船机是一种大型的专用连续型散货卸船机械，在现代港口及散货码头物流中占有非常重要的地位，具有卸船效率高、环境污染小、对船型与货物的适用性广、重量轻、结构简单等优点。本文所研究的新型L型螺旋卸船机，相比于传统螺旋卸船机，在取料方式、垂直螺旋中间支撑方式、料流转接方式、输送机支承结构以及俯仰平衡系统等方面进行了大量创新，提高了卸船效率，降低了卸船能耗。垂直螺旋输送机是新型L型螺旋卸船机的核心组成部分，它的性能直接影响整个螺旋卸船机的工作效率，对其进行研究主要可分为两个方面：1、物料垂直输送性能；2、结构的动力学性能。其中，由于垂直螺旋输送机结构庞大，载荷组合极为复杂，动力学行为难以预测，目前国内外对其结构的动力学性能研究还处于基础阶段。本文以新型L型螺旋卸船机垂直螺旋输送机作为研究对象，运用动力学理论以及有限元分析方法，对输送机的结构振动特性进行研究，，主要工作包括以下几个方面： 1、针对垂直螺旋输送机结构动载的初始激励形式以及振动机理进行了研究，确定了激励的产生与作用方式，并给出了激励的计算式。 2、建立了集中参数下垂直螺旋输送机结构响应系统的离散模型和模型的动力学方程，选取X方向振动为研究对象，求解动力学方程，得到了离散模型的固有特性以及对任意激励的响应。 3、运用Ansys软件建立了垂直螺旋输送机结构响应系统的有限元模型，分析了作用于模型的静载荷，求出了模型的结构静力特性以及模态特性，明确了电机和螺旋轴的偏心振动是引起输送机振动的主要原因。 4、通过扩展分析周期，将瞬态动力学分析方法运用到本文的振动效应研究中，求出了垂直电机额定转速下结构的位移响应结果与应力响应结果，由结果可知，输送机的振动最终将达到稳态，并且结构在Y方向的振动要比在X方向的振动严重。运用谐响应分析技术，研究了垂直螺旋输送机结构响应系统在不同的电机转速下结构的振动响应幅值分布规律，得到了结构的共振速度区间，为输送机工作速度的选取与制定提供了理论依据。
[Abstract]:Spiral ship unloader is a kind of special and continuous bulk ship unloader, which occupies a very important position in modern port and bulk terminal logistics. It has high unloading efficiency, low environmental pollution, wide applicability to ship type and cargo, and light weight. Simple structure and other advantages. Compared with the traditional spiral ship unloader, the new L type screw ship unloader studied in this paper has made a great deal of innovations in the aspects of material collection, vertical screw intermediate support, material flow connection, conveyor support structure and pitching balance system, etc. The efficiency of unloading is improved and the energy consumption of unloading is reduced. Vertical screw conveyer is the core part of the new L type screw ship unloader. Its performance directly affects the working efficiency of the whole screw ship unloader. The research can be divided into two aspects: 1, the vertical conveying performance of material and the dynamic performance of the structure. Due to the large structure of vertical screw conveyor, the load combination is extremely complex, and the dynamic behavior is difficult to predict, the research on the dynamic performance of the structure is still in the basic stage at home and abroad. In this paper, the dynamic theory and finite element analysis method are used to study the structural vibration characteristics of the new type L screw ship unloader vertical screw conveyor. The main work includes the following aspects: 1. The initial excitation form and vibration mechanism of the vertical screw conveyor structure are studied, and the generation and action mode of the excitation are determined, and the calculation formula of the excitation is given. 2. The discrete model and the dynamic equation of the structural response system of vertical spiral conveyor under concentrated parameters are established. The vibration in X direction is selected as the research object, and the dynamic equation is solved. The inherent characteristics of the discrete model and the response to arbitrary excitation are obtained. 3. The finite element model of the structural response system of vertical spiral conveyor is established by using Ansys software. The static load acting on the model is analyzed, and the static and modal characteristics of the model are obtained. The eccentricity vibration of motor and helical shaft is the main cause of the vibration of conveyer. 4. By extending the analysis period, the transient dynamic analysis method is applied to the study of vibration effect in this paper, and the displacement response and stress response of the structure under rated speed of vertical motor are obtained. The vibration of the conveyor will eventually reach steady state, and the vibration of the structure in Y direction is more serious than that in X direction. By means of harmonic response analysis technique, the amplitude distribution of structural vibration response of vertical spiral conveyor under different motor speeds is studied, and the resonance velocity range of the structure is obtained. It provides a theoretical basis for the selection and formulation of the working speed of the conveyer.
【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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