The Modeling And Analysis Of Dynamic Contact Stress Of The Rolling Bearing Based On SPH

With the development of machinery manufacturing industry, machinery and equipment gradually to the high speed, high precision and heavy development, because of this trend, people began to pay attention to the life and performance of high speed bearing. Study on bearing dynamic contact process is the most effective method is the experimental measurement and numerical simulation, but experimental detection methods often by the interference of external factors in the experimental data is not accurate, will be subject to funding, safety, facilities and other factors constraints. Therefore, people often make by using numerical simulation method to study.The traditional calculation method, on the basis of empirical assumptions and, through the establishment of a variety of complex mathematical model to calculate the relevant parameters, the applicability is not wide enough. Based on the mesh of finite element method, finite difference method and finite volume method is researchers to use most of the methods, but it is difficult to effectively simulation large deformation and fluid solid coupling problem of real-time dynamic. The reason is that the complex nonlinear coupling interface remeshing and real-time tracking is very difficult. Therefore, it is necessary to study the modeling method and algorithm simulation, do not need to re mesh the real-time dynamic.The SPH method is a new calculation method, the dealing with large deformation problems especially fluid has the superiority has been in numerous studies have proved, in the finite element software add SPH module has become the SPH method is a new development trend. FEM with SPH method each have advantages and disadvantages, for rolling bearing contact analysis should not only consider the coupling of the oil film and the contact analysis of the problem, but also consider the macro deformation and micro large deformation problems. Research ideas: divide the problem domain, contact microscopic deformation region and the fluid portion of the SPH method is adopted, and rolling body using the finite element method. Using this method, not only can simulate large deformation, but also can improve the computational efficiency. SPH program is developed, which is a very difficult work, in addition to understand the fluid mechanics of SPH theory, also need to theory of SPH program implementation. Abroad researchers using FORTRAN language procedures for the preparation of the SPH, for example, Liu et al. Design the structured three-dimensional SPH program; Daniel designed for SPH Simulation of interactive visualization tools SPLASH; et al Gesteira design for computer program SPHysics, SPH theory research, some relatively mature business program also will SPH process is embedded into the software package, such as before and after the treatment of comprehensive software ls-prepost and ANSYS / LS-DYNA. With the expansion of the scale of SPH program, the researchers found that if you want to extend the new SPH theory design to existing SPH program, it is very difficult. Such as adding new material properties and new particle attributes must be SPH program has been designed to modify, and perhaps even to re write the whole software system, which led to the difficult and expansibility and difficult maintenance with SPH program. As a result, I am using the mature commercial software ANSYS / LS-DYNA and ls-prepost, conducts the research to the SPH coupled finite element method, and the projectile penetrating target and rolling body and the oil film coupling modeling and analysis, compared with only using finite element analysis of large deformation problems and problem of fluid solid coupling, finite element / SPH coupling method more effective.