APPLICATIONS OF PHYSICAL SIMULATION IN THE DEVELOPMENT OF HOT WORKING PROCESSES

Modelling has become a more and more valuable tool in the design, control and development of steel processing. Empirical regression equations, physically based approachs, artificial neural networks and hybrid models are being theied in computer modelling. In all cases, relevant data are necessary, which can be most economically obtained by physical simulation. Physical simulation with a Gleeble simulator has been used in a large number of tasks at the University of Oulu for ten years in cooperotion with the Finnish metals industry. Some examples of these will be described and discussed below, such as the optimization of the recrystallization controlled rolling process, the improvement of the hot strength model for the control of coiling tension and the optimization of continuous strip annealing schedules.Finally,brief remarks will be then on a couple of projects now under way.

Migration law of respirable dust on a super-long fully mechanized double-shearer working face

In order to understand the migration law of respirable dust and gain reasonable design parameters for dust control on a super-long double-shearer fully mechanized working face, this paper describes research carried out using a numerical simulation package(Fluent) based on gas-solid coupling dispersed multiphase flow model and field measurement to research different technology modes, dust distribution law at different intervals where shearers work in opposite directions on the lower 9303 face, No. 2 Jining Mine,Yankuang Coal Mining Co. Results show that the concentration of dust 3–6 m away from the shearers working in the same directions was large, while the impact area of respirable dust near the shearer increased significantly to 5–6 m with the distance between two shearers working in opposite directions.The concentration of dust on a double-shearer face was considerably higher than that of a face with one shear under the combined effect of wind speed on the face and disturbed wind around the shearer, while the dust concentration near the shearer on the return side was considerably higher than that on the inlet side. The concentration of dust on a double-shearer face along the airflow declined slowly so that dust was hard to control. Simulation results confirmed the results of field measurement, which could provide reference for dust prevention design.

带式输送机静动态特性计算与分析

针对某型带式输送机,在Solid Works平台上设计了数字化样机模型。分析并计算了槽形托辊组与传动滚筒的静态载荷,以此为依据,在Simulation环境下建立带式输送机的有限元模型,通过静力学分析获得了应力、变形云图,分析结果表明带式输送机具有安全的强度和刚度储备。通过模态分析计算带式输送机的动力学特性,获得了固有频率和振型,明确了带式输送机在低阶共振频率下的振动模式,为其工况下的减振降噪、速度控制以及动力学优化提供了重要依据。

基于Simulation的涡旋压缩机支架体动态改进设计

以某型涡旋压缩机为依据,建立了支架体结构特征化模型,利用Simulation模块对其进行有限元建模和模态分析,计算出了模态频率及振型。通过优化曲面壳体壁厚和加强肋数量,有效提升了支架的动力学性能。不同结构改进方案的动态分析结果表明:壳体壁厚增加1.5 mm或加强肋数量增加到12个,分别能使支架第1阶模态频率增大5.6%和7.57%,有效增强了支架结构的频率储备,为其结构设计和动力学优化提供了重要依据。

RFID天线薄膜静态变形的有限元仿真及试验研究

文中通过Solid Works Simulation有限元分析,计算了RFID天线薄膜在不同载荷和伸出长度情况下的变形量;同时搭建视觉检测试验设备,经视觉测量得到RFID天线薄膜在不同载荷和伸出长度下的变形量。综合计算结果和试验结果,发现两者在数据上基本吻合,变化趋势一致。

Simulation experiment on anti-penetration capability of anchored rock mass

In order to solve the problem of experimental research on the penetration process of projectile into anchored rock mass, we derived the essential similarity conditions for the physical simulation experi- ment according to the similarity theory, carried out the experiment on the penetration process of a kind of penetrating bomb into the anchored rock mass of type III, and compared the experimental results with the values computed by the professional Young's empirical formula. The test results show that the phys- ical simulation experiment can represent the actual penetration process of projectile into anchored rock mass. The research method proposed in this paper provides technical support for the experimental research on the design and reconstruction of underground protection works.

竹粉模压花盆跌落冲击有限元数值仿真

以竹粉模压花盆为研究对象,应用Solid Works建立三维有限元模型,运行Simulation对其跌落冲击过程进行有限元分析。通过数值仿真,分析花盆底孔数量、跌落角度和跌落高度对花盆壳体跌落冲击应力的影响,为竹粉模压花盆的耐撞性分析和设计提供理论依据。结果表明,花盆壳体上各点等效应力随各点距接触面距离和壳体几何形状不同而不同,底孔数量为2时,相同条件下壳体最大等效应力最小,跌落角度和高度对最大等效应力的影响显著。