Semi-Passive Linear Actuator for Low-Power Satellite Deployment
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Solution Overview
Problem
Existing space-based actuators, such as those used in satellites, face challenges in reducing electrical power draw and extending service life due to high power consumption, especially in environments where solar energy is limited.
Innovation Solution
A semi-passive linear actuator utilizing an electrochromatic material to control sunlight transmission and a heat-sensitive polymer fiber actuator to change length in response to temperature changes, optionally with an auxiliary heater, allowing activation using solar energy or electrical power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a mechanical actuator such as a solenoid is used, then deployment of structures can be achieved, but electrical power consumption is high
Solution Approach 1:
The patent changes the actuation mechanism from electrical (solenoid) to thermal (shape memory alloy), fundamentally altering the energy parameter from electrical power to thermal energy, thereby reducing electrical power consumption while maintaining deployment capability
Solution Approach 2:
The patent replaces the electrical mechanical system (solenoid) with a thermal-mechanical system (shape memory alloy actuator), substituting electrical actuation with thermally-driven mechanical deformation to reduce electrical power requirements
2Power
If an explosive charge is used for deployment, then structure release can be achieved, but the actuator is single-use and cannot be reused
Solution Approach 1:
The patent replaces the disposable explosive charge with a reusable shape memory alloy actuator that can be cycled multiple times, transforming a single-use deployment mechanism into a multi-use system that extends service life
Solution Approach 2:
The patent changes the deployment mechanism from chemical (explosive) to thermal-mechanical (shape memory alloy), enabling repeated actuation cycles and extending the duration of action from single-use to multiple deployments
3Productivity
If solar panels are repositioned using electrical actuators, then power generation can be improved, but electrical power is consumed
Solution Approach 1:
The patent enables the actuator to use waste heat from the spacecraft or thermal energy from the environment to reposition solar panels, allowing the system to serve itself by converting available thermal energy into mechanical work for panel adjustment, improving power generation without consuming additional electrical power
Solution Approach 2:
The patent replaces electrical actuators with shape memory alloy actuators for solar panel repositioning, substituting electrical energy consumption with thermal energy utilization, thereby improving productivity without increasing electrical power demand
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
Reduces electrical power consumption and extends operational life by using solar energy and thermal activation, enabling efficient deployment and retraction of satellite structures without relying solely on electrical power.
Implementation Method 1
a housing having at least one wall made from an electrochromatic material configured to transform from an opaque to a translucent material in response to a voltage
Implementation Method 2
An actuator is disposed between the plunger and the housing, the actuator being made from a heat sensitive material, the actuator being configured to change a length of the actuator in response to a change in temperature
Data Source
AI summary
A linear actuator and a method of operating is provided. The linear actuator includes a housing having at least one wall made from an electrochromatic material configured to transform from an opaque to a translucent material in response to a voltage. A plunger is slidably coupled to the housing to move between a first position and a second position. An actuator is disposed between the plunger and the housing, the actuator being made from a heat sensitive material, the actuator being configured to change a length of the actuator in response to a change in temperature.