Elevator Accelerometer Multi-Axis Vibration Analysis
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Solution Overview
Problem
Current elevator systems primarily monitor acceleration along the vertical axis to detect safety brake activation, but lack the capability to effectively analyze and respond to vibratory signatures in multiple directions, which can indicate issues like faulty roller guides, seismic activity, or improperly engaged safety systems.
Innovation Solution
A method and system that utilize accelerometers to detect vibratory signatures in three orthogonal directions, comparing them to known signatures to determine probable causes, and trigger responses such as activating an alarm, stopping the elevator, or adjusting its movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only vertical axis acceleration is monitored for safety brake activation, then the system remains simple, but the capability to detect and analyze vibratory signatures indicating faults is insufficient
Solution Approach 1:
The patent transitions from monitoring only the vertical axis (1D) to monitoring three orthogonal axes (3D), enabling comprehensive detection of vibratory signatures in multiple directions. This dimensional expansion allows the system to capture fault indicators that manifest in lateral or longitudinal directions, significantly improving reliability without excessive complexity increase
Solution Approach 2:
The accelerometer system is designed to perform multiple functions: traditional safety brake activation detection plus fault detection through vibratory signature analysis. By making the monitoring system universal, it handles both safety-critical functions and diagnostic functions using the same hardware platform, improving reliability while managing complexity
2Measurement precision
If three-axis vibratory signature monitoring is implemented, then fault detection capability is improved, but the device complexity increases
Solution Approach 1:
The system employs three accelerometers oriented along orthogonal axes (X, Y, Z) to capture vibratory signatures in three-dimensional space. This multi-dimensional measurement approach significantly improves measurement precision by detecting vibrations regardless of their direction, while the modular sensor arrangement keeps implementation complexity manageable
Solution Approach 2:
The patent uses multiple accelerometers (copies of the same sensor type) arranged in different orientations to capture comprehensive vibration data. This redundant sensing approach improves measurement precision through multi-axis coverage while maintaining simplicity by using identical sensor components repeatedly rather than developing complex single-sensor solutions
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 the detection and analysis of vibrations in elevator cars across multiple axes, allowing for the identification of potential faults and anomalies, thereby enhancing safety and maintenance efficiency.
Implementation Method 1
one or more accelerometers operably connected to an elevator car, the one or more accelerometers configured to detect at least one vibratory signature of an elevator car
Data Source
AI summary
A method of monitoring vibratory signatures of an elevator car is provided. The method comprising: detecting at least one vibratory signature of an elevator car, the vibratory signature comprising: a first vibratory signature in a first direction; and determining a probable cause of the at least one vibratory signature by comparing the at least one vibratory signature to a known vibratory signature.