Passive RF Sensor Nodes for Building Stress Monitoring
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Solution Overview
Problem
Conventional wireless sensors used for building stress monitoring require frequent battery replacements, leading to resource wastage, environmental pollution, and high maintenance costs, while existing methods lack efficient remote monitoring capabilities for large structures.
Innovation Solution
A passive sensor network system with pebble-shaped nodes containing pressure sensors and radio frequency signal acquisition modules that harness energy from radio frequency signals for power, enabling continuous operation without battery replacement and implementing time synchronization and role conversion methods for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wireless sensors with batteries are used for building stress monitoring, then data acquisition and transmission can be performed, but frequent battery replacement is required leading to resource wastage, environmental pollution, and high maintenance costs
Solution Approach 1:
The sensor node performs self-charging by harvesting energy from ambient radio frequency signals through the radio frequency signal acquisition module and energy storage module, eliminating the need for external battery replacement and实现ing self-sustained operation
Solution Approach 2:
The patent replaces the mechanical battery replacement system with an electromagnetic energy harvesting system that converts radio frequency signals into electrical energy for continuous operation
2Reliability
If conventional wireless sensors with batteries are used for building stress monitoring, then data acquisition and transmission can be performed, but frequent battery replacement leads to high maintenance costs and manpower requirements
Solution Approach 1:
The sensor node performs self-charging by harvesting energy from ambient radio frequency signals through the radio frequency signal acquisition module and energy storage module, eliminating the need for external battery replacement and实现ing self-sustained operation
Solution Approach 2:
The radio frequency signal acquisition module serves dual functions: it acts as both a communication module for data transmission and an energy harvesting module for power supply, reducing the overall system complexity and maintenance requirements
3Productivity
If pressure sensor module continuously operates for real-time monitoring, then building stress can be monitored in real-time, but energy consumption increases depleting battery capacity
Solution Approach 1:
The system implements periodic wake-sleep cycles where the pressure sensor module alternates between active sensing state and low-power sleep state, reducing overall energy consumption while maintaining monitoring capability through periodic activation
Solution Approach 2:
The patent replaces the mechanical battery replacement system with an electromagnetic energy harvesting system that converts radio frequency signals into electrical energy for continuous operation
4Quantity of substance
If radio frequency signal acquisition module harvests energy continuously, then energy storage increases enabling longer operation, but energy harvesting capacity must be sufficient to wake up the pressure sensor module
Solution Approach 1:
The system employs feedback control where the pressure sensor module monitors stored energy levels and adjusts its activation decisions accordingly, only waking up when sufficient energy is available in the energy storage module
Solution Approach 2:
The system dynamically adjusts the operating state of the pressure sensor module based on real-time energy availability, transitioning between sleep and active states according to the charged state of the energy storage module
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
The system allows for real-time monitoring of building stress, reduces battery waste, and enhances safety by providing early warnings for stress imbalances, ensuring continuous operation and reducing maintenance costs, while overcoming limitations of existing sensor technologies.
Implementation Method 1
the pressure sensor module receives electric energy provided by the radio frequency signal acquisition module
Data Source
AI summary
The building stress balance monitoring system of the passive sensor network, relating to the technical field of information, and aiming to solve the problem of making the pressure sensor easier to be charged in building stress monitoring. The system includes plurality of nodes arranged in the same building surface of the building or arranged in the supporting surface of the bridge; each node mainly consists of the pressure sensor module, the radio frequency signal acquisition module, and the network module; the sensing surface of the pressure sensing module acquires building pressure information and transmits same to the pressure sensor module; the pressure sensor module receives electric energy provided by the radio frequency signal acquisition module, and converts the pressure information into data, which can be uploaded to the network through the network module. The effect of making the pressure sensor easier to be charged is achieved.