Transport Refrigeration Unit Engine Control to Mitigate Resonance
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Solution Overview
Problem
Transport refrigeration units (TRUs) face issues with vibration-induced resonance, leading to component failure due to antiquated or unanticipated configuration variabilities and deterioration of TRU engine mounts, which can result in excessive motion and potential system failure.
Innovation Solution
A system utilizing a TRU controller that dynamically adjusts the TRU engine operation by processing real-time shock and vibration data from accelerometers to avoid resonance, comparing data to reference ranges and failure indicators, and communicating with a fleet central server for preventative maintenance and design updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the TRU engine operates at speeds corresponding to resonance frequencies, then the energy and effect of vibrations are magnified, but this leads to component failure
Solution Approach 1:
The system dynamically adjusts the TRU engine operating speed in real-time based on feedback from vibration sensors. The controller continuously monitors vibration levels and modifies engine speed to avoid resonance frequencies, transforming the static operating speed into a dynamic parameter that adapts to changing conditions to prevent component failure
Solution Approach 2:
The system employs a feedback control mechanism where vibration sensors continuously monitor the TRU components, and the controller uses this information to adjust engine operating speed. This closed-loop feedback system detects resonance conditions and automatically modifies operation to avoid magnified vibrations that cause component failure
2Reliability
If the TRU engine operation is dynamically adjusted to avoid resonance, then component failure is prevented, but this requires real-time monitoring and control systems
Solution Approach 1:
The TRU system performs self-diagnosis and self-adjustment regarding resonance avoidance. The vibration sensors and controller work autonomously to monitor system conditions and adjust engine operation without requiring external intervention or complex external control systems, allowing the TRU to service itself regarding resonance management
Solution Approach 2:
The controller serves multiple functions: it manages normal TRU operation, processes vibration data from sensors, determines resonance conditions, and adjusts engine speed accordingly. By consolidating these diverse functions into a single controller, the system avoids the need for separate dedicated resonance control hardware, reducing overall device complexity
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
This solution proactively mitigates resonance, preventing component failure, ensuring smoother engine operations, improving product reliability, and reducing maintenance and warranty costs by automatically adjusting engine frequencies and triggering alerts for potential failures.
Implementation Method 1
obtaining a first set of data that comprises real time measurements from one or more accelerometers installed in the TRU; converting the real measurements to a second set of data that comprises real time shock and vibration data
Implementation Method 2
processing the second set of data in a control loop to determine an updated operational baseline that avoids resonance detected in the first set of data
Data Source
AI summary
A system for dynamically mitigating resonance in a transport refrigeration unit (TRU) during a mission, having: a TRU controller configured for operating a TRU engine during the mission according to an operational baseline, and while operating the TRU engine, contemporaneously performing steps including: obtaining a first set of data that comprises real time measurements from one or more accelerometers installed in the TRU; converting the real measurements to a second set of data that comprises real time shock and vibration data; processing the second set of data in a control loop to determine an updated operational baseline that avoids resonance detected in the first set of data; and operating the TRU engine according to the updated operational baseline.