Sensor Fish for Hydropower Turbine Testing
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Solution Overview
Problem
Existing sensor devices used to assess hydraulic conditions in hydro dams are not robust enough to survive extreme conditions, lack rapid data acquisition capabilities, and are limited in deployment and cost, making them unsuitable for newer turbine designs and environments.
Innovation Solution
Development of a 'sensor fish' equipped with sensors for acceleration, rotation, magnetic field intensity, pressure, and temperature, powered by a rechargeable battery, with a low-power microcontroller for data collection and a recovery system, allowing for deployment in various hydro-turbine environments and providing rapid data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If early sensor devices were used to measure hydraulic conditions, then data on pressure, acceleration, and rotation could be collected, but the devices lacked robustness to survive extreme conditions and could not acquire data rapidly enough
Solution Approach 1:
The sensor fish employs a rechargeable lithium-ion battery providing 50-100 hours of operation, enabling sustained rapid data acquisition through extreme hydraulic conditions without power interruption, thus simultaneously achieving robustness and high productivity
Solution Approach 2:
The device replaces fragile mechanical sensor assemblies with integrated electronic sensing systems including accelerometers, gyroscopes, and pressure sensors connected to a microcontroller, enabling rapid digital data acquisition while withstanding extreme mechanical stresses
2Adaptability or versatility
If existing sensor devices were deployed in newer turbine designs, then some measurement data could be obtained, but the devices could not tolerate new and unknown conditions
Solution Approach 1:
The sensor fish integrates multiple sensing capabilities (acceleration, rotation, pressure, temperature) into a single universal device that can adapt to various turbine types including Francis turbines and pump storage facilities, while the robust housing and protective measures ensure survival in previously untested extreme conditions
3Ease of manufacture
If conventional sensor devices were used, then deployment costs could be controlled, but the devices had functional limitations and deployment problems
Solution Approach 1:
The sensor fish is designed as a modular system with separable components including the sensor package, battery compartment, and recovery mechanism, allowing cost-effective manufacturing and assembly while maintaining advanced functional capabilities for rapid data acquisition in diverse hydraulic environments
4Measurement precision
If sensor fish with multiple sensors and rapid data acquisition were implemented, then accurate hydraulic condition data could be obtained, but device complexity and cost would increase
Solution Approach 1:
Multiple sensors (accelerometers, gyroscopes, pressure sensors, temperature sensors) are merged into a single integrated sensor fish unit with unified power supply and data processing, achieving high measurement precision while managing device complexity through consolidation rather than proliferation of separate systems
Data Source
AI summary
An improved sensor fish with robust design and enhanced measurement capabilities. This sensor fish contains sensors for acceleration, rotation, magnetic field intensity, pressure, and temperature. A low-power microcontroller collects data from the sensors and stores up to 5 minutes of data on a non-volatile flash memory. A rechargeable battery supplies power to the sensor fish. A recovery system helps locating sensor fish. The package, when ready for use is nearly neutrally buoyant and thus mimics the behavior of an actual fish.