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CarSim仿真快速入门(十六)—CarSim传感器仿真之ADAS Sensor Objects (2)
2022-07-25 19:51:00 【小明师兄】
VS命令和计算顺序VS Commands and the Sequence of Calculations
如前所述,运动对象的运动可以使用内置的可配置函数SPEED_TARGET来获得速度,并使用LTARG来获得相对于路径的横向位置。或者,可以使用随VS命令添加的导入变量和/或方程式指定运动和位置。
每个时间步进行的计算Calculations made each time step
每个时间步长,整个仿真测试的计算顺序(与移动对象有关)如下:
1. 从微分方程计算的所有状态变量都是已知的,因为它们是在上一个时间步长的末尾计算的.
2. 所有导入变量均从Simulink等外部软件获得.
3. 处理所有EQ_IN方程。
4. 处理所有内置方程,以获得车辆模型和所有移动物体的所有内置输出和导数。同样,所有EQ_DYN方程都被处理。
5. 将处理所有EQ_OUT方程和EQ_DIFFERENTIAL方程。
6. 复制所有已激活用于导出的输出以进行导出。
7. 对ODE进行数值积分以获得下一步骤的状态变量.
给定该顺序,应使用EQ_IN命令添加任何直接影响位置变量的方程式,以使新位置在进行其他计算之前生效。另一方面,可以将速度方程式与EQ_OUT或EQ_DIFFERENTIAL相加,因为直到第6步才使用速度。通过等到第5步,可以使用涉及在第4步中计算出的变量的公式。
初始化期间进行的计算Calculations made during initialization
启动VS求解器时,为开始仿真做的准备工作(与移动对象有关)如下:
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