NuVinci无级变速器的特性分析、试验及应用研究
发布时间：2019-02-18 12:05
【摘要】：随着现代科技及工业化的发展，机械无级变速器因其具有结构简单、传动平稳、工作可靠的优点，得到了越来越广泛的应用，同时各生产领域对无级变速器的要求也愈来愈高。针对现有水稻田间育秧播种器播种量调节过程繁琐，调节量不易控制的问题，本文在研究分析NuVinci无级变速器（原型为Free-Ball）机械特性的基础上，提出了一种基于机械无级变速器的播量调节传动方案，并对其进行了虚拟样机仿真。 本文的主要研究内容及结论如下： 1）对NuVinci无级变速器的变速传动机构进行了运动学和动力学分析。通过建立数学模型，对其传动比、变速比、承载功率、滑动率、机械效率等机械特性与结构参数之间的关系进行理论研究，并利用MATLAB编程语言得出了各结构参数、材料属性对机械特性影响的三维曲面图，为Free-Ball型无级变速器的结构参数选取打下了基础； 2）对NuVinci无级变速器的调速机构进行了分析，针对其槽轮轮廓的设计提出了一种基于无级变速器输出传动特性曲线的槽轮轮廓反求设计方法，并根据田间育秧播种器的设计要求进行了实例设计； 3）基于VB.net和UG软件对NuVinci无级变速器进行了参数化变形设计，为Free-Ball型无级变速器变速传动机构的参数化、系列化设计打下了基础； 4）利用ADAMS仿真软件对NuVinci无级变速器进行虚拟样机仿真实验，针对不同的调速情况及负载与否进行运动学仿真分析； 5）研制了无级变速传动试验台，在不同传动比情况下对其传动效率随负载及速度变化的机械特性进行了试验研究，试验结果表明：该无级变速器的传动效率随传动比的变化而发生改变且在等速传动时达到最大值；在结构参数选取R0=15m m, Rc=20mm时，最大承载转矩在15N m，进一步验证了理论分析的正确性。 6）在上述研究分析的基础上，通过对现有水稻田间育秧播种器的播量调节原理进行分析，提出了基于Free-Ball型无级变速器变速传动的播量调节改进方案，并利用UG软件完成了虚拟样机的装配。对现有的播量调节装置与无级变速传动播量调节方案进行分析比较，结果表明无级变速传动播量调节方案不仅大大简化了播种器播种量调节装置的结构和操作程序，而且也有效地提高了播种密度的连续性和均匀性，，能较好的适应不同播种密度的农艺要求。
[Abstract]:With the development of modern science and technology and industrialization, mechanical stepless transmission has been more and more widely used because of its advantages of simple structure, stable transmission and reliable work. In order to solve the problem that the regulation process of seeding quantity of seeder between paddy fields is tedious and the regulating quantity is not easy to control, the mechanical characteristics of NuVinci stepless transmission (prototype is Free-Ball) are studied and analyzed in this paper. In this paper, a scheme of variable rate transmission based on mechanical stepless transmission is proposed, and the virtual prototype simulation is carried out. The main contents and conclusions of this paper are as follows: 1) Kinematics and dynamics analysis of the variable speed transmission mechanism of NuVinci stepless transmission is carried out. Through the establishment of mathematical model, the relationship between mechanical characteristics and structural parameters, such as transmission ratio, variable speed ratio, bearing power, slippage rate and mechanical efficiency, is studied theoretically, and the structural parameters are obtained by using MATLAB programming language. The 3D surface diagram of the material properties which affects the mechanical properties lays the foundation for the selection of the structural parameters of the Free-Ball type CVT. 2) the speed regulation mechanism of NuVinci CVT is analyzed, and an inverse design method of groove wheel profile based on the output transmission characteristic curve of CVT is proposed for the design of the profile of the slot wheel. According to the design requirements of field seedling seeder, an example design was carried out. 3) based on VB.net and UG software, the parameterized deformation design of NuVinci stepless transmission is carried out, which lays a foundation for the parameterization and serialization design of Free-Ball stepless transmission. 4) the virtual prototype simulation experiment of NuVinci stepless transmission is carried out by using ADAMS simulation software, and the kinematics simulation analysis is carried out according to the different speed regulation situation and load or not. 5) the stepless variable speed transmission test-bed is developed, and the mechanical characteristics of its transmission efficiency varying with load and speed under different transmission ratios are studied experimentally. The experimental results show that the transmission efficiency of the CVT varies with the transmission ratio and reaches the maximum when the transmission speed is constant. The maximum bearing torque is 15N m when the structural parameters are selected R0 / 15mm and Rc=20mm, which further verifies the correctness of the theoretical analysis. 6) on the basis of the above research and analysis, through the analysis of the principle of seeding quantity regulation of the existing rice field seeder, the improved scheme of sowing quantity adjustment based on the variable speed transmission of Free-Ball type stepless transmission is put forward. The assembly of virtual prototype is completed by using UG software. This paper analyzes and compares the existing sowing rate regulation device and the continuously variable speed drive. The results show that the scheme not only simplifies the structure and operation procedure of the seeder seeding quantity regulation device, but also greatly simplifies the sowing rate regulation scheme of the continuously variable speed transmission. It also improves the continuity and uniformity of seeding density, and can adapt to the agronomic requirements of different sowing densities.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.46
本文编号：2425815
[Abstract]:With the development of modern science and technology and industrialization, mechanical stepless transmission has been more and more widely used because of its advantages of simple structure, stable transmission and reliable work. In order to solve the problem that the regulation process of seeding quantity of seeder between paddy fields is tedious and the regulating quantity is not easy to control, the mechanical characteristics of NuVinci stepless transmission (prototype is Free-Ball) are studied and analyzed in this paper. In this paper, a scheme of variable rate transmission based on mechanical stepless transmission is proposed, and the virtual prototype simulation is carried out. The main contents and conclusions of this paper are as follows: 1) Kinematics and dynamics analysis of the variable speed transmission mechanism of NuVinci stepless transmission is carried out. Through the establishment of mathematical model, the relationship between mechanical characteristics and structural parameters, such as transmission ratio, variable speed ratio, bearing power, slippage rate and mechanical efficiency, is studied theoretically, and the structural parameters are obtained by using MATLAB programming language. The 3D surface diagram of the material properties which affects the mechanical properties lays the foundation for the selection of the structural parameters of the Free-Ball type CVT. 2) the speed regulation mechanism of NuVinci CVT is analyzed, and an inverse design method of groove wheel profile based on the output transmission characteristic curve of CVT is proposed for the design of the profile of the slot wheel. According to the design requirements of field seedling seeder, an example design was carried out. 3) based on VB.net and UG software, the parameterized deformation design of NuVinci stepless transmission is carried out, which lays a foundation for the parameterization and serialization design of Free-Ball stepless transmission. 4) the virtual prototype simulation experiment of NuVinci stepless transmission is carried out by using ADAMS simulation software, and the kinematics simulation analysis is carried out according to the different speed regulation situation and load or not. 5) the stepless variable speed transmission test-bed is developed, and the mechanical characteristics of its transmission efficiency varying with load and speed under different transmission ratios are studied experimentally. The experimental results show that the transmission efficiency of the CVT varies with the transmission ratio and reaches the maximum when the transmission speed is constant. The maximum bearing torque is 15N m when the structural parameters are selected R0 / 15mm and Rc=20mm, which further verifies the correctness of the theoretical analysis. 6) on the basis of the above research and analysis, through the analysis of the principle of seeding quantity regulation of the existing rice field seeder, the improved scheme of sowing quantity adjustment based on the variable speed transmission of Free-Ball type stepless transmission is put forward. The assembly of virtual prototype is completed by using UG software. This paper analyzes and compares the existing sowing rate regulation device and the continuously variable speed drive. The results show that the scheme not only simplifies the structure and operation procedure of the seeder seeding quantity regulation device, but also greatly simplifies the sowing rate regulation scheme of the continuously variable speed transmission. It also improves the continuity and uniformity of seeding density, and can adapt to the agronomic requirements of different sowing densities.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.46
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