# Homework, Quizzes, Simulation Examples — Time Integration — Lesson 6

### Simulation Examples

Several simulation examples are provided here. Each of them comes with a description file, video instruction and Ansys simulation files. All of the simulations are conducted using Ansys Mechanical. Download the student version of Ansys here.

#### (1) A Moving Robot Arm

When a robot arm rotates and stretches, the strain and stress within the arm are usually neglected and the arm is regarded as a rigid body mechanism. Simulation is helpful for finding the moving path of the robot arm, and the moment and force needed to move the arm. Check out this simulation to see how a rigid body dynamics simulation is conducted. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

#### (2) Can Crush

Simulations can be applied everywhere, even crushing a soda can. This type of short duration impact problem is a perfect illustration of explicit time integration. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

### Homework

#### (1) Gears Intermeshing in a Simple Gearbox

Which time integration approach to choose highly depends on the objective of the simulation. Suppose you want to study the movement of gears and the moment applied at the base to maintain a certain rotation speed. What type of analysis would you choose? Assume a rotational velocity of 360rad/s is applied to the small gear and conduct a simulation to find out the reaction moment. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

#### (2) Engine Connecting Rod

When an engine is at high rotating speed, the connecting rod will undergo repetitive tensile and compressive stress. Conduct a simulation of an engine rotating at 100 RPM (as shown below) and find the maximum and minimum stress value in the connecting rod.

One great benefit of using rigid body analysis is that it can significantly save on computational costs. In this simulation, you can set the engine connecting rod as a flexible body and keep all other parts as rigid. Refer to the Readme file for connection definitions. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

Lesson Content