自升式海洋平台升降传动系统设计关键技术研究

发布时间：2018-06-28 08:56

本文选题：自升式海洋平台 + 传动系统　；参考：《大连理工大学》2015年硕士论文

【摘要】：随着陆地石油开采的枯竭,进入海洋开采成为主流,目前主要在150米水深以内范围,而自升式海洋平台以其独特的优势在近海油气勘探开采中居主力军地位。升降传动系统在自升式平台中占据不可替代的关键地位,它的性能直接影响工程船舶在使用过程中的优劣,甚至影响到平台的作业和可变载荷。目前国内外的自升式平台升降传动系统主要由国外厂家所生产,因此对自升式平台升降传动系统关键技术研究显得尤为重要。本文以某300ft自升式海洋平台升降传动系统为研究对象,指出其减速器设计结构不足之处,并对其结构进行改进,利用动力学理论研究混合式齿轮传动系统动态响应,然后通过解析法和数值计算方法分析超大模数齿轮齿条强度及其承载能力影响因素,最后为验证前述计算方法的正确性,本文构建了300ft自升降传动系统齿轮齿条实验研究平台,对超大模数齿轮齿条齿根部位应力值进行实测,具体研究内容如下：(1)通过分析自升式平台混合式行星齿轮传动系统传统设计结构形式,指出其不足之处,将其结构改进为一种差动式行星齿轮传动结构形式,实现单输入双输出,并根据设计要求,给出平行轴系和差速级齿轮的主要参数,建立平行轴轮系和差速级齿轮三维模型。(2)综合考虑时变啮合刚度、啮合误差、啮合阻尼、支撑刚度和阻尼等,根据集中参数法建立自升式平台升降装置齿轮传动系统动力学模型,利用牛顿第二定律建立其动力学微分方程,并给出计算动力学微分方程时,相关参数的计算方法,其中主要给出超大模数齿轮齿条的啮合刚度计算方法。在恒载激励下,利用MATLAB求解动力学微分方程得到各级齿轮的振动位移响应。(3)首先以材料力学为理论基础,给出超大模数齿轮齿根危险截面应力不同计算方法,然后采用数值计算方法对大模数齿轮齿条进行动、静态特性研究,得到齿轮齿条啮合过程中应力的变化规律,将分析得到弯曲应力值与解析法计算结果比较,验证其准确性,最后对比考虑连接轴和不考虑连接轴得到的计算结果,说明连接轴对齿根弯曲应力的影响。(4)建立自升式平台升降系统齿轮传动实验台,在其升降过程中采集大模数齿轮齿条齿根部位应变、应力及齿条振动加速度,得到大模数齿轮齿条齿根部位危险截面受拉侧和受压侧应力变化规律,并将其所得结果与数值计算结果进行对比,验证有限元方法计算超大模数齿轮齿根弯曲强度的可靠性。
[Abstract]:With the exhaustion of land oil exploitation, it is the main stream to enter the ocean mining. At present, it is mainly within 150 meters of water depth, and the self lift offshore platform occupies the main position in the offshore oil and gas exploration and exploitation with its unique advantages. The lift drive system occupies an irreplaceable key position in the jack up platform, and its performance directly affects the work. The advantages and disadvantages of the ship in the process of use even affect the operation of the platform and the variable load. At present, the lifting system of the jack up platform is mainly produced by the foreign manufacturers. Therefore, it is particularly important to study the key technology of the lifting system of the jack up platform. In this paper, a 300ft jack up and lifting system of a jack up platform is used in this paper. As the research object, the paper points out the shortcomings of the design structure of the reducer, improves its structure, studies the dynamic response of the hybrid gear transmission system by the dynamics theory, and then analyzes the influence factors of the strength and bearing capacity of the super large modulus gear rack and its bearing capacity through the analytical and numerical methods. Finally, the previous calculation method is verified. In this paper, the experimental research platform of 300ft self lifting and lifting gear rack and rack is constructed, and the stress values of the super large modulus gear rack and rack are measured. The specific research contents are as follows: (1) through the analysis of the traditional structure form of the hybrid planetary gear drive system of the self lifting platform, the shortcomings are pointed out, and its structure is changed. In the form of a differential planetary gear transmission structure, a single input and double output is realized and the main parameters of parallel shafting and differential gear are given according to the design requirements. A three dimensional model of parallel axle gear train and differential gear is set up. (2) considering the time-varying meshing stiffness, meshing error, meshing damping, support stiffness and damping, and so on. The dynamic model of the gear drive system of the lifting platform is established by the medium parameter method. The differential equation of the dynamics is established by Newton's second law, and the calculation method of the related parameters is given in the calculation of the differential equation of the dynamics. The calculation method of the meshing stiffness of the gear rack of the superlarge modulus is mainly given. Under the constant load, the MA is used. TLAB solves the vibration displacement response of gears at all levels by solving dynamic differential equations. (3) first of all, based on the theory of material mechanics, the different calculation methods of the stress section stress of the superlarge modulus gear teeth are given. Then the numerical calculation method is used for the action of the large modulus gear rack and the static state characteristics, and the gear rack meshing process should be obtained. The variation law of the force is compared with the calculated results of the bending stress and the analytical method, and the accuracy is verified. Finally, the calculation results of the connecting shaft and the connection axis are taken into account, and the effect of the connecting shaft on the bending stress of the tooth root is explained. (4) a gear drive test bench for the lifting and descending system of the jack up platform is set up in the process of lifting and lifting. The strain, stress and vibration acceleration of the tooth root of the gear rack and rack of the large modulus gear rack and rack are obtained, and the stress variation law of the dangerous cross section of the tooth root of the large model teeth is obtained, and the results are compared with the numerical calculation results, and the reliability of the finite element method is verified to calculate the bending strength of the tooth root of the super large modulus gear.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE951

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