Hoist Power-Line Communication for Real-Time Gripper Control
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Solution Overview
Problem
Existing automated material handling systems face challenges with communication delays and limitations in real-time data transmission due to periodic communication systems, which bundle emergency and time-dependent controls, leading to operational inefficiencies and potential delays.
Innovation Solution
A hoist communication device utilizing a master and slave communication unit that performs power line communication through a single power supply line, employing different carrier frequencies for individual communication with gripper devices, enabling real-time and periodic communication simultaneously, with adaptive signal adjustments for noise and error detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If periodic communication is used in the hoist device, then system complexity is reduced and ease of operation is improved, but communication delay increases and real-time data transmission capability deteriorates
Solution Approach 1:
The communication system is segmented into multiple independent communication paths, each operating at different carrier frequencies (e.g., first carrier frequency for real-time communication, second carrier frequency for periodic communication). This allows simultaneous execution of real-time and periodic communications without mutual interference, resolving the contradiction between ease of operation and communication delay.
Solution Approach 2:
The system changes the carrier frequency parameter to differentiate between real-time and periodic communication channels. By allocating specific frequency ranges to specific communication types, the system enables both simple periodic communication and low-latency real-time communication to coexist, addressing the contradiction between operational simplicity and time efficiency.
2Loss of time
If multiple communication paths are implemented for real-time and periodic communication, then communication delay is reduced and real-time data transmission capability is improved, but system complexity increases
Solution Approach 1:
The power supply line embedded in the belt is designed to serve multiple functions: it provides both power supply and communication pathways. By utilizing the same physical infrastructure for multiple communication purposes at different frequencies, the system achieves multi-functionality without proportionally increasing physical complexity.
Solution Approach 2:
Carrier waves at different frequencies act as intermediaries that enable simultaneous real-time and periodic communications through the shared power supply line. These frequency-based intermediaries allow multiple communication streams to coexist without direct interference, managing system complexity while enabling advanced communication capabilities.
3Device complexity
If power line communication is used through the belt, then the number of communication lines is reduced and device complexity is lowered, but susceptibility to noise and interference increases
Solution Approach 1:
The system uses frequency differentiation as a parameter change strategy to combat noise. By assigning different carrier frequencies to different communication types and using corresponding demodulation techniques, the system can filter out noise and interference specific to each frequency band, maintaining signal integrity despite the noisy power line environment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient, real-time communication with gripper devices using different carrier frequencies, reducing communication delays and ensuring reliable operation by adapting to noise and error conditions, thereby optimizing system performance.
Implementation Method 1
a master communication unit and a slave communication unit perform a power line communication through one power supply line provided on a belt
Implementation Method 2
employing different carrier frequencies for individual communication with gripper devices
Implementation Method 3
demodulates the modulated control signal using the corresponding carrier frequency, transmit the demodulated control signal to each gripper device corresponding to the corresponding identification information
Data Source
AI summary
A hoist communication device in a rail car of an automated material handling system in which a master communication unit and a slave communication unit perform power line communication through one power supply line provided on a belt and a rail car controller connected to the master communication unit is individually communicated with a plurality of gripper devices connected to the slave communication unit using different carrier frequencies.