Advanced Manufacturing Systems - CIM Industry 4.0

Programming Exercises for course DPMS_AS/1110 - Intelligent Manufacturing Systems, School of Mechanical Engineering, National Technical University of Athens.

Exercise 1 - Timed Petri net for simulating control of flexible manufacturing system

In this exercise we created a model of a manufacturing system, using petri nets. In the petri net P-Invariant and T-Invariant analysis was used, in order to check the the bound of the system as well and the deadlocks.

How to run

In order to run, first you must downnload software PIPE v.4.3.0. In addition open a terminal or cmd inside Pipe directory and execute the command

java Pipe

Exercise 2 - Prediction of Temprature - Time at welding plate using Neural Networks

In this exercise we have created two neural network models for predicting maximum temperature at a welding plate process and predicting the time interval for temperatires above 723C.

Installation

pip3 install virtualenv
virtualenv neural_network
source neural_network/bin/activate
pip3 install -r requirements.txt

Training

For maximum temperature NN training, run this command

python3 MaxTemperatureNN_training.py

For time over 723 Celcius degrees NN training, run this command

python3 AboveStandardTemperatureNN_training.py

Usage

For maximum temperature prediction, run this command

python3 MaxTemperatureNN_inference.py --plate_thickness 0.004 --initial_temperature 180 --heat_input 900 --electrode_velocity 0.004 --X 0.0 --Y 0.02 --Z 0.002

For time over 723 Celcius degrees, run this command

 python3 AboveStandardTemperatureNN_inference.py --plate_thickness 0.005 --initial_temperature 200 --heat_input 1200 --electrode_velocity 0.0035 --X 0.025 --Y 0.025 --Z 0.0025 

Exercise 3 - Genetic Algorithm for Optimazition of welding process

In this exercise we have created a genetic algorithm for optimizing the neural networks for welding plate process. The cost funtion of the algorithm implements an euclidean distance between two temperatures. It also uses a penalty criterion on temperature on two occasions.

-The first occasion is when

$$T \lt A$$

-The second occasion is when

$$T \gt K$$

Authors

George Kassavetakis

George Krommydas

Lampis Papakostas