The Modular Design and Production of an Intelligent Robot Based on a Closed-Loop Control Strategy
Summary
We present a protocol on modular design and production of intelligent robots to help scientific and technical workers design intelligent robots with special production tasks based on personal needs and individualized design.
Abstract
Intelligent robots are part of a new generation of robots that are able to sense the surrounding environment, plan their own actions and eventually reach their targets. In recent years, reliance upon robots in both daily life and industry has increased. The protocol proposed in this paper describes the design and production of a handling robot with an intelligent search algorithm and an autonomous identification function.
First, the various working modules are mechanically assembled to complete the construction of the work platform and the installation of the robotic manipulator. Then, we design a closed-loop control system and a four-quadrant motor control strategy, with the aid of debugging software, as well as set steering gear identity (ID), baud rate and other working parameters to ensure that the robot achieves the desired dynamic performance and low energy consumption. Next, we debug the sensor to achieve multi-sensor fusion to accurately acquire environmental information. Finally, we implement the relevant algorithm, which can recognize the success of the robot's function for a given application.
The advantage of this approach is its reliability and flexibility, as the users can develop a variety of hardware construction programs and utilize the comprehensive debugger to implement an intelligent control strategy. This allows users to set personalized requirements based on their needs with high efficiency and robustness.
Introduction
Robots are complex, intelligent machines that combine knowledge of several disciplines, including mechanics, electronics, control, computers, sensors and artificial intelligence 1,2. Increasingly, robots are assisting or even replacing humans in the workplace, especially in industrial production, due to the advantages robots possess in performing repetitive or dangerous tasks. The design of the intelligent robot protocol in the current study is based on a closed-loop control strategy, specifically path planning based on a genetic algorithm. Furthermore, the functional modules have been strictly divided3,4, which may provide a solid foundation for future optimization work, so that the robots have a strong capacity for upgrades.
The modular implementation of the robotic platform is based primarily on the following methods: multi-dimensional combination control strategy in motor control module5,6, and intelligent exploration based on a genetic algorithm in the optimization algorithm module.
We use double closed-loop control of the DC motor and four-quadrant motor operation in the motor control module. Double closed-loop speed control means that the output of the speed regulator serves as the input of the current regulator, allowing it to control the current and torque of the motor. The advantage of this system is that the torque of the motor can be controlled in real-time based on the difference between the given speed and the actual speed. When the difference between given and actual speeds is relatively large, the motor torque increases and the speed changes faster to drive the motor speed toward the given value as quickly as possible, which makes for rapid speed regulation7,8,9. Conversely, when the speed is relatively close to the given value, it can automatically reduce the torque of the motor to avoid excessive speed, allowing the speed to achieve the given value relatively quickly with no error6,10. Since the equivalent time constant of the electric current loop is relatively small, the four-quadrant motor11,12 can respond more quickly to suppress the impact of interference when the system is subject to external interference. This allows it to improve the stability and anti-jamming ability of the system.
We choose a genetic intelligent optimization algorithm with the highest efficiency based on the results of a simulation run in MATLAB. A genetic algorithm is a stochastic parallel search algorithm based on the theory of natural selection in genetics. It constitutes an efficient method for finding the global optimal solution in the absence of any initial information. It regards the solution set of the problem as a population, thereby increasing the quality of the solution via continuous selection, crossover, mutation and other genetic operations. With regard to path planning by intelligent robots, difficulty arises as a result of insufficient initial information, complicated environments and nonlinearity. Genetic algorithms are better able to solve the problem of path planning because they possess global optimization ability, strong adaptability and robustness in solving nonlinear problems; there are no specific restrictions on the problem; the calculation process is simple; and there are no special requirements for the search space 13,14.
Protocol
Representative Results
Discussion
In this paper, we designed a type of intelligent robot that can be built autonomously. We implemented the proposed intelligent search algorithm and autonomous recognition by integrating several software programs with hardware. In the protocol, we introduced basic approaches for configuring the hardware and debugging the intelligent robot, which may help users design a suitable mechanical structure of their own robot. However, during actual operation, it is necessary to pay attention to stability of the structure, its ope…
Disclosures
The authors have nothing to disclose.
Acknowledgements
The authors would like to express their gratitude to Mr. Yaojie He for his assistance in performing the experiments reported in this paper. This work was supported in part by the National Natural Science Foundation of China (No. 61673117).
Materials
| structural parts | UPTECMONYH HAR | L1-1 | |
| structural parts | UPTECMONYH HAR | L2-1 | |
| structural parts | UPTECMONYH HAR | L3-1 | |
| structural parts | UPTECMONYH HAR | L4-1 | |
| structural parts | UPTECMONYH HAR | L5-1 | |
| structural parts | UPTECMONYH HAR | L5-2 | |
| structural parts | UPTECMONYH HAR | U3A | |
| structural parts | UPTECMONYH HAR | U3B | |
| structural parts | UPTECMONYH HAR | U3C | |
| structural parts | UPTECMONYH HAR | U3F | |
| structural parts | UPTECMONYH HAR | U3G | |
| structural parts | UPTECMONYH HAR | U3H | |
| structural parts | UPTECMONYH HAR | U3J | |
| structural parts | UPTECMONYH HAR | I3 | |
| structural parts | UPTECMONYH HAR | I5 | |
| structural parts | UPTECMONYH HAR | I7 | |
| structural parts | UPTECMONYH HAR | CGJ | |
| link component | UPTECMONYH HAR | LM1 | |
| link component | UPTECMONYH HAR | LM2 | |
| link component | UPTECMONYH HAR | LM3 | |
| link component | UPTECMONYH HAR | LM4 | |
| link component | UPTECMONYH HAR | LX1 | |
| link component | UPTECMONYH HAR | LX2 | |
| link component | UPTECMONYH HAR | LX3 | |
| link component | UPTECMONYH HAR | LX4 | |
| Steering gear structure component | UPTECMONYH HAR | KD | |
| Steering gear structure component | UPTECMONYH HAR | DP | |
| Infrared sensor | UPTECMONYH HAR | E18-B0 | Digital sensor |
| Infrared Range Finder | SHARP | GP2D12 | |
| Gray level sensor | SHARP | GP2Y0A02YK0F | |
| proMOTION CDS | SHARP | CDS 5516 | The robot steering gear |
| motor drive module | Risym | HG7881 | |
| solder wire | ELECALL | 63A | |
| terminal | Bright wire | 5264 | |
| motor | BX motor | 60JX | |
| camera | Logitech | C270 | |
| Drilling machine | XIN XIANG | 16MM | Please be careful |
| Soldering station | YIHUA | 8786D | Be careful to be burn |
| screwdriver | EXPLOIT | 043003 | |
| Tweezers | R`DEER | RST-12 |
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