implicit_euler_iterative_solve

自己在数模中写的关于照相机标定的代码，跟大家分享(Write their own within a few modules of code on the camera calibration, to share with you)

optmization algorithm method "Davidon-Fletcher -Powell" DFP

The modeling and attitude stabilization control problems of a four-rotor vertical takeoff and landing unmanned air vehicle (UAV) known as the quadrotor are investigated.The quadrotor’s attitude is represented by the unit quaternion rather than Euler angles to avoid singularity problem. Taking dynamical behavior of motors into consideration and ignoring aerodynamic effect, a nonlinear controller is developed to stabilize the attitude.The control design is accomplished by using backstepping control technique.The proposed control law is based on the compensation for the Coriolis and gyroscope torques. Applying Lyapunov stability analysis proves that the closed-loop attitude system is asymptotic stable. Moreover, the controller can guarantee that all the states of the system are uniformly ultimately bounded in the presence of external disturbance torque.The effectiveness of the proposed control approach is analytically authenticated and also validated via simulation study.

电话线出现断线或短路故障时，线路的阻抗则发生很大变化，利用电桥法测试出电阻的大小，进而得出线路故障的地方(Telephone lines appear disconnection or short circuit fault, the line impedance is changed, test out the size of resistance by Wheatstone bridge method, and then draw the line fault place )

state flow program in Matlab simulink.

说明：  在matlab下运行，实现基于模拟退火算法的函数求极小值算法，绝对能运行成功！(Run in matlab to realize the function based on simulated annealing algorithm for seeking the minimum, the absolute can run successfully!)

数值积分和数值微分的相应方法，程序测试无误。(Numerical integration and numerical differentiation of the corresponding program to test and correct. )

DQ抽下的永磁同步电机模型建立···········(DQ pumping under the permanent magnet synchronous motor model)

计算SQUIRT 模型，弹性波在饱和多孔介质中传播时，一种微观流动机制(used to realize the Squirt flow model)

矩量法matlab求对称阵子天线方向图,同时附有Hallen方程的解题思路(MoM dipole antenna)