Mobile Robot Control 2021 Group 2

Team

Soshala Weerathunge: 1563890

Shaun Boyteen Joseph: 1554972

Rishi Ramkannnan: 1537415

Markus Fuernkranz: 1585495

Yaodong Li: 1536532

Daiwei Fan: 1594516

---

Introduction

In situations where there is increased stress on hospital systems (in cases of pandemic for example), it is a common occurrence that hospital staff work overtime and are too few in number to meet the workload. In such cases, there is possibility of reduced quality of service that can be provided to the patients undergoing treatment. There are several ways to combat this problem. The most effective solution is to incorporate autonomous robots that can reliably perform those tasks which do not necessarily require the expertise of hospital staff such as doctors and nurses. This will free doctors and nurses to engage in more important work. The behavior of the PICO robot has been designed to perform the task of reliable point to point motion. The robot is able to move from any starting location to a desired target location while seamlessly avoiding obstacles and walls. The design of this complex behavior of the robot is accomplished in two stages.

In stage 1, the robot behavior is designed to tackle the obstacle room challenge, where the robot has to exit a room as fast as possible. This stage will form the foundation of the PICO behavior upon which additional capabilities are to be incorporated (in stage 2) to obtain the finished product.

In stage 2, additional capabilities such as obstacle detection, obstacle avoidance, target identification and many more are incorporated for the purpose of passing the Hospital Challenge. Completion of stage 2 will result in our finished product, PICO for Hospital applications.

Design Document

We have created a design document to facilitate the successful completion of the robot design. The design document contains information regarding various aspects such as robot requirements, software functions that contribute to robot behaviour, components of the robot and their specifications, interfaces and many more. This document will be the platform on which the entire robot design procedure is carried out.

The Design Document is provided here. File:4SC020 Design proposal.pdf

Stage 1: Escape Room Challenge

Introduction

The escape room challenge comprises the first stage of the design of the autonomous robot. This challenge was performed virtually using a simulator with the designed robot behaviour. The Escape Room competition is subject to several environmental and challenge specifications, which are provided below:-

Challenge Specifications:-

1. PICO should not bump into walls
2. PICO should make at least one sensible move every 30 seconds.
3. Total time to complete the challenge is 300 seconds.
4. Maximum translational speed of the robot is 0.5 m/s and the maximum rotational speed is 1.2 rad/s.

Environment Specifications:-

1. The shape of the room is rectangular.
2. The orientation of the corridor is perpendicular to the wall.
3. The walls need not be perfectly straight, the corners need not be perfectly perpendicular and the walls of the corridor might not be perfectly parallel.

Robot behaviour to tackle the Escape Room Challenge

The behaviour scheme designed to tackle the Escape Room Challenge consists of four finite state machines (abbreviated as FSM), which are as follows:-

FSM 1: To detect a wall
FSM 2: To align with a wall
FSM 3: To follow a wall
FSM 4: To enter the exit corridor when it is found

The Finite state machine network is presented in figure 1:-