Dual-Sensitivity Accelerometer Seismic Detection for Elevators
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Solution Overview
Problem
Conventional seismic units for vertical transportation equipment, such as elevators, often provide inaccurate or failed readings during seismic events due to accelerometer malfunctions, leading to potential safety hazards for building occupants.
Innovation Solution
A seismic-detection sensor device utilizing two three-axis accelerometers with different sensitivities (±3g and ±5g) to detect seismic activity, a processor to analyze and compare data, and a robust system for self-diagnosis and low-power operation, capable of adapting to various environments and integrating with auxiliary sensors for enhanced safety features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single accelerometer is used in conventional seismic units, then the device complexity is reduced, but the measurement precision and reliability deteriorate due to inaccurate readings and potential failures
Solution Approach 1:
The patent applies local quality by using two accelerometers with different sensitivity ranges (first accelerometer with higher sensitivity, second accelerometer with lower sensitivity). Each accelerometer is optimized for detecting specific acceleration magnitudes, allowing the system to maintain high measurement precision across a wider range of seismic conditions without simply adding redundant identical sensors.
Solution Approach 2:
The patent implements parameter changes by varying the sensitivity parameter of the accelerometers. The first accelerometer has a first sensitivity configured for detecting lower acceleration values, while the second accelerometer has a second sensitivity configured for detecting higher acceleration values. This parameter differentiation allows the system to accurately measure both subtle and intense seismic events.
2Reliability
If a single accelerometer is used, then the device complexity is low, but the reliability deteriorates due to accelerometer malfunction and failure
Solution Approach 1:
The patent applies preliminary action through the processor comparing acceleration values from both accelerometers before making seismic event determinations. The processor continuously monitors and validates readings from the first and second accelerometers, identifying potential malfunctions or outliers before they compromise the overall system reliability. This preliminary validation ensures that faulty sensor data does not lead to incorrect seismic assessments.
3Adaptability or versatility
If two accelerometers with different sensitivities are used, then the adaptability to various seismic conditions is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamics by enabling the processor to dynamically select which accelerometer reading to trust based on real-time conditions. The processor compares acceleration values from both sensors and can determine when one accelerometer may be malfunctioning or when environmental factors are affecting one sensor more than the other. This dynamic validation approach allows the system to adapt to various seismic conditions and sensor states.
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 reduces false alarms, ensures reliable operation, and provides a low false-alarm rate, is adaptable, and maintains functionality during power outages, enhancing the safety and configurability of vertical transportation systems.
Implementation Method 1
a first accelerometer configured to detect acceleration at a first acceleration sensitivity
Data Source
Figure 1
Figure 2
AI summary
A seismic-detection sensor device includes two accelerometers having different sensitivities. The seismic-detection sensor device provides excellent precision and operability monitoring.