Ultrasonic Transducer Array Layout for Wind Turbine Bat Deterrence
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Solution Overview
Problem
Wind turbines pose a threat to bat populations due to their location in areas inhabited by threatened and endangered species, and existing solutions do not effectively deter bats from entering the rotor-swept zone without constant intervention.
Innovation Solution
A bat deterrent system utilizing multiple ultrasonic transducers emitting different frequency ranges and waveforms, strategically positioned and oriented on wind turbines to create a dynamic and adaptive ultrasonic emission pattern that deters bats from approaching the rotor-swept zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single frequency ultrasonic deterrent is used, then the device complexity is low, but bats can habituate to the deterrent and it becomes ineffective
Solution Approach 1:
The system dynamically changes ultrasonic frequency and waveform parameters over time, switching between multiple frequencies (e.g., 20-100 kHz range) and waveform types (continuous, pulsed, randomized patterns) to prevent bats from adapting to a static deterrent signal
Solution Approach 2:
The patent implements changes in physical parameters including frequency modulation (sweeping through different frequency bands), amplitude modulation (varying signal strength), and temporal pattern changes (continuous vs. pulsed emission with randomized intervals) to maintain deterrent effectiveness
2Adaptability or versatility
If multiple transducers emitting different frequencies are used, then the deterrent is more effective against multiple bat species, but the device complexity increases
Solution Approach 1:
The ultrasonic deterrent system is divided into multiple independent transducer units, each capable of emitting different frequency ranges. This segmentation allows the system to target different bat species with appropriate frequencies while maintaining modular scalability
Solution Approach 2:
The transducer array is designed to perform multiple functions: emitting different frequency bands to target various bat species, generating different waveform patterns (continuous, pulsed, randomized), and providing omnidirectional coverage through strategic positioning around the wind turbine
3Reliability
If ultrasonic emissions are continuous, then the deterrent coverage is comprehensive, but energy consumption increases
Solution Approach 1:
The system employs periodic pulsed emission patterns where ultrasonic signals are transmitted in intervals rather than continuously. The pulse duration, interval length, and duty cycle are optimized to maintain bat deterrence while significantly reducing average power consumption compared to continuous emission
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 effectively prevents bats from entering the hazardous rotor-swept zone by providing a dynamic and varied ultrasonic deterrent that is less likely to be habituated to, thereby reducing bat fatalities and accommodating multiple bat species through diverse frequency and waveform outputs.
Implementation Method 1
A first bank of four transducers may be positioned in a first deterrent box and a second bank of four transducers may be positioned in a second deterrent box
Data Source
AI summary
A bat deterrent system to deter bats from approaching wind turbines may include a first deterrent box having a first and second transducer bank. The first transducer bank may include a first set of transducers located on a first plane and a second set of transducers located on a second plane. The second plane may be different from the first plane. The bat deterrent system may also include a second deterrent box having a third and fourth transducer bank. The third transducer bank may include a third set of transducers located on a third plane and a fourth set of transducers located on a fourth plane. The fourth plane may be different from the third plane. At least one transducer may simultaneously emit a different ultrasonic output waveform than the ultrasonic output waveform emitted from another transducer.