三相三电平逆变器的两个相同电路进行建模power_3level

说明：  fluent，使用UDF定义凝固模型中的源项，实现自热发热源(Fluent, using UDF to define the source term in solidification model, to realize self heating heat source)

说明：  关于3维应力应变的金属本构方程子程序代码显式vumat(On the Subprogram Code of 3-D Stress-Strain Constitutive Equation of Metals Explicit VUMA)

纳入了机械损伤和应变速率的断裂UMAT子程序，不能用于平面应力。(The fracture UMAT subroutine incorporating mechanical damage and strain rate can not be used for plane stress.)

说明：  在fluent仿真软件中定义DPM两相流计算(Fluent user defined DPM Model)

粒子群算法的仿真程序，并采用典型benchmark进行演示分析； 然后，应用粒子群算法进行热工过程水轮机系统模型辨识，matlab软件可直接运行； 采用粒子群算法与PID参数整定进行联合仿真，用以提高PID控制器对热工过程水轮机的控制性能。(Particle swarm algorithm simulation program, and the use of a typical benchmark for demonstration analysis; Then, the particle swarm optimization algorithm is used to identify the turbine system model of the thermal process. The matlab software can be run directly. Particle swarm algorithm and PID parameter tuning are used to simulate the PID controller to improve the control performance of the hydraulic turbine.)

说明：  3.5 GHz 是 5G 网络部署的重要频段，本文结合射线跟踪模型，对 3.5 GHz 的无线传播特性进行了研究，并于 1.8 GHz 进行了对比，提出 5G 网络初期部署的建议(3.5GHz is an important frequency band for 5g network deployment. In this paper, the radio propagation characteristics of 3.5GHz are studied in combination with ray tracing model, and compared with 1.8GHz. Suggestions for initial deployment of 5g network are proposed)

这是一个用于演化博弈 画图 code 的代码，里边有函数和计算过程，大家可以结合自己需要看看(evolutional game model code)

说明：  建立基于子空间辨识的PEMFC电特性状态空间模型。(A state space model of PEMFC electrical characteristics based on subspace identification is established.)

腹板式渐开线直齿圆柱齿轮建模,利用ANSYS软件模拟，能很容易得到应力分布(Modeling of web type involute spur gear)

说明：  平面用cohesive单元模拟仿真裂纹扩展和结构失效，裂纹扩展(Plane simulation of crack growth and structure failure, crack growth with cohesive element)