Following are the components and systems we added in our This is one of our main achievements. Normally these toy design. A carbon fibre rod and specially designed small mechanical helicopters are designed to carry only their own weight. To make the helicopter capable of carrying the extra load of added modules; we parts to incorporate several modules on the helicopter’s body, Special increased the operating battery voltages from 7.8V to 11.1V, 1.8A. heat sinks for motors of the main rotors, IR Range Finders that serve The motors have a maximum rating of 14V and we are operating in a as the basic sensing units, BLDC Motors to implement the Wrong Command Rejection and Optimization (WCRO) Algorithm, An AVR safe range. To achieve this task we had to go through a series of based Isolated modular System that serves as the main controlling experiments with various Power MOSFETs incorporated in place of unit, Payload capability enhancing module, Wireless video camera. original FETs i.e. D150 used in the starting model. One important problem we encountered was that the motors The problem we encountered in achieving this feature was that there was not enough voltage for the gate drive available at the started to get heated up after sometime during the flight. We receiver circuit’s original FETs. To overcome this problem we incorporated our specially designed heat sinks inside the body to overcome this problem. We identified the empty spaces inside the conducted a complete study of the receiver circuit, did reverse helicopter’s body near the main motors and placed the heat sinks engineering on it and extracted signals at different points as shown in there, so that they connect with the body and whole body becomes a Fig. 2. A total of 200mW power is being consumed by the transmitter heat sink; effectively increasing the heat dissipation. module and is working on the principle of PPM (Pulse Position The desired final result was to ensure safe flights and crash Modulation). There are two power ports for the two motors of the avoidance. To achieve this purpose we decided to use IR Range main rotors being powered through the JFETs as numbered. Then Finders and BLDC motors. The challenge was to place them on the there is a small port for the tail rotor. The receiver-transmitter radio helicopter’s body so that they monitor a good effective area around set operates at a frequency of 40 MHz. A piezoelectric gyroscope is the helicopter.
Table of Contents
I. INTRODUCTION
II. DEVELOPMENT OF THE DESIGN
A. Design Experimentation
1) Tail Rotor Positioning:
2) Pendulum Effect:
3) Centre of Gravity and Fulcrum Effect:
B. Design Modifications
1) Modified Assembly
2) Functions and Results
a) Payload Carrying Capability Enhancement
b) The Sensing System
c) Isolated Embedded System
d) BLDC Motors for WCRO Algorithm Implementation
III. MODULES INTERLINKAGE & SIGNAL FLOW
IV. DESIGN COMPARISONS
V. CONCLUSION
VI. FUTURE WORK
Research Objectives and Themes
This paper aims to design and develop a highly cost-effective, semi-autonomous reconnaissance Unmanned Aerial Vehicle (UAV) by modifying a low-cost toy helicopter. The primary research goal is to demonstrate that essential UAV features, such as safe flight in confined environments, real-time video feedback, and collision avoidance, can be achieved without the high financial costs associated with standard commercial systems.
- Modification and upgradation of low-cost, small-sized toy helicopters into functional UAVs.
- Implementation of a novel Wrong Command Rejection and Optimization (WCRO) Algorithm for collision avoidance.
- Integration of IR Range Finders and BLDC motors to enhance flight stability and maneuverability.
- Payload capability enhancement through optimized battery and Power MOSFET integration.
- Design of an AVR-based isolated embedded control system for centralized task management.
Excerpt from the Publication
Centre of Gravity and Fulcrum Effect
This modification was made while balancing the weight of added modules on the helicopter. The centre of gravity of a helicopter is right under the main rotors. We used fulcrum effect while placing the camera and control module on the helicopter i.e. camera being light weight was placed at the front end and its battery being a bit heavy was placed near the main rotors. A light weight far from C.G with a little heavy weight near the C.G balanced the load.
Summary of Chapters
I. INTRODUCTION: Provides an overview of the strategic importance of UAVs and defines the essential components required for a functional, economically viable system.
II. DEVELOPMENT OF THE DESIGN: Details the experimental process, including modifications to the tail rotor, battery configuration, and the integration of specialized modules for sensing, control, and payload capacity.
III. MODULES INTERLINKAGE & SIGNAL FLOW: Describes the implementation of the WCRO algorithm and how sensor data is processed to ensure safe navigation and collision avoidance.
IV. DESIGN COMPARISONS: Presents a comparative analysis demonstrating the cost-effectiveness and performance of the proposed design against existing market alternatives.
V. CONCLUSION: Summarizes the successful conversion of a toy helicopter into a stable, crash-resistant, and high-payload UAV prototype.
VI. FUTURE WORK: Outlines potential improvements, such as advanced video processing for target tracking and the integration of additional sensors like compasses and gyroscopes.
Keywords
Helicopter, Pay load, Cost effective UAV, BLDC, WCR, Unmanned Aerial Vehicle, Reconnaissance, Collision Avoidance, Embedded System, IR Range Finder, Flight Control, AVR ATMEGA 88, Robotics, Wireless Video, Hardware Modification.
Frequently Asked Questions
What is the primary focus of this research?
The research focuses on transforming an inexpensive toy helicopter into a semi-autonomous UAV capable of reconnaissance missions and safe flight in congested areas at a significantly reduced cost.
What are the core technical themes addressed in the paper?
The core themes include cost-effective UAV hardware design, automated collision avoidance via the WCRO algorithm, sensor integration, and payload weight optimization.
What is the central research objective?
The objective is to achieve high-performance UAV functionalities, such as stable flight and payload carrying capacity, while maintaining economic viability through the modification of off-the-shelf toy helicopters.
Which scientific methods are employed?
The authors use experimental design methods to test physical modifications (e.g., tail rotor removal, center of gravity balancing) and algorithmic development (WCRO algorithm) to achieve flight stability.
What content is covered in the main section of the paper?
The main section covers the design evolution, specific electrical and mechanical modifications (such as IR sensor and BLDC motor integration), and the interlinkage of system components for autonomous signal flow.
Which keywords best describe this study?
Key terms include Cost effective UAV, WCRO Algorithm, Collision Avoidance, BLDC motors, and Autonomous flight.
How does the WCRO algorithm specifically improve safety?
The WCRO algorithm monitors sensor data for obstacle presence and overrides user input if that input would lead to a collision, automatically directing the helicopter toward a safer path.
What payload capacity was the final prototype capable of handling?
After the modifications, the prototype was tested successfully with a maximum payload of up to 2.0kg.
How was the challenge of overheating components addressed?
The authors incorporated specially designed heat sinks into the helicopter's body, utilizing the chassis as a heat dissipator, and used mica sheets to provide electrical insulation for Power MOSFETs.
- Quote paper
- Muhammad Ishfaq Javed (Author), 2012, Modification of a Toy Helicopter into a Highly Cost Effective Unmanned Aerial Vehicle , Munich, GRIN Verlag, https://www.grin.com/document/190796
