Cartridge-Heated Pendulum Damper for Cyclic Anti-Icing
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Solution Overview
Problem
Existing pendulum dampers in tilt rotor applications face challenges with ice accretion, requiring high power consumption for continuous heating and temperature limitations, which can lead to inefficient ice protection and increased production costs.
Innovation Solution
The integration of high-power density cartridge heaters within the damper body, allowing for high-temperature heating and cyclical operation, which reduces power consumption and enhances ice protection without the need for a composite shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If composite heated shell is used to protect pendulum dampers from ice accretion, then ice protection is provided, but power consumption is high and temperature is limited
Solution Approach 1:
The patent changes the heating parameters by using solid metal dampers that can withstand higher temperatures, allowing the heater to operate at elevated temperatures more efficiently. This reduces the total energy required compared to low-temperature composite shell heating systems.
Solution Approach 2:
The patent uses solid metal (tungsten) damper bodies that inherently resist ice accretion due to their thermal properties and surface characteristics, eliminating the need for insulated composite shells and reducing the energy required for heating.
2Object-affected harmful factors
If composite heated shell is used for ice protection, then ice accretion is prevented, but temperature operation is limited
Solution Approach 1:
The patent employs solid metal (tungsten) damper bodies that can withstand high operating temperatures without degradation, unlike composite shells which have temperature limits. This enables the heating system to operate at higher temperatures for more effective ice prevention.
Solution Approach 2:
The patent changes the material parameter from composite to solid metal, which fundamentally alters the temperature operating range upward, allowing the heater to reach higher temperatures without damaging the damper structure.
3Object-affected harmful factors
If continuous heating is used to prevent ice accretion, then ice protection is maintained, but power consumption increases
Solution Approach 1:
The patent enables cyclical heating operation because the solid metal damper retains heat effectively and can withstand temperature fluctuations. The heater can be turned on periodically rather than continuously, reducing power consumption while maintaining ice protection.
Solution Approach 2:
The patent changes the thermal mass and heat retention parameters by using solid metal dampers, which store heat more effectively than composite shells. This allows the system to use intermittent heating cycles instead of continuous heating, significantly reducing energy consumption.
4Object-affected harmful factors
If custom tooling is used for composite shell heating, then ice protection is achieved, but production cost increases
Solution Approach 1:
The patent uses solid metal dampers that can be manufactured using conventional machining processes, eliminating the need for specialized composite shell fabrication tooling and reducing production costs.
Solution Approach 2:
The patent extracts the heating function from the structural damper body, using a separate heater element that can be installed through conventional bores. This separates the structural and heating functions, allowing standard metal machining rather than custom composite tooling.
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 effectively prevents ice accretion on pendulum dampers by maintaining high temperatures during operation while reducing power requirements and simplifying the control system, enabling efficient and cost-effective anti-icing.
Implementation Method 1
a cartridge heater installed within the heater bore, the cartridge heater configured to generate heat and heat a material of the damper body
Implementation Method 2
a thermal paste disposed between the cartridge heater and the material of the damper body
Data Source
AI summary
Pendulum dampers are described. The pendulum dampers include a damper body having a first end and a second end, with an axial direction defined between the first end and the second end with a heater bore passing through the damper body in the axial direction from a tail port at the second end toward the first end and a cartridge heater installed within the heater bore, the cartridge heater configured to generate heat and heat a material of the damper body.