发展纤维-布拉格-格集成的人工嵌入式肌,用于多功能评估温度,应变和曲率
Robertson Pires-Junior1, Anselmo Frizera1, Carlos Marques2
1Graduate Program in Electrical Engineering, Federal University of Espírito Santo, Vitoria 29075-910, Brazil.
Sensors (Basel, Switzerland)
|September 9, 2023
概括
研究人员开发了一种生物模拟人工肌,嵌入了纤维布拉格格 (FBGs). 这种智能结构既可以作为结构部件,也可以作为传感器,可以在降低应变灵敏度的情况下精确地估计角度.
科学领域:
- 生物仿真工程 生物仿真工程
- 材料科学是一种材料科学.
- 有光学传感器的感应器.
背景情况:
- 人工肌对于机器人执行器和假肢设备至关重要.
- 将传感器集成到结构部件中可以提高功能和效率.
研究的目的:
- 开发和描述一种嵌入光纤的人造肌,具有仿生性质.
- 评估在肌结构中集成的纤维布拉格格 (FBGs) 的传感器功能,以监测应变,温度和曲率.
- 评估这个多功能设备对智能结构的潜力.
主要方法:
- 一个基于聚氨的人工肌的制造,嵌入三个光纤,每个光纤都有一个铭刻的纤维布拉格格 (FBG).
- 使用应力-张力曲线来确定扬模和张力极限的机械表征.
- 环境和机械测试,包括温度变化,单轴应变和曲率分析.
- 分析光学功率和波长转移用于角度估计.
主要成果:
- 人工肌的机械性能 (模量,张力极限) 根据纤维集成可定制.
- 与裸体FBG相比,嵌入肌的FBG显示出降低了应变敏感性 (高达77%),这是由于应变场分布导致的.
- 温度反应表现出与聚氨矩阵分布相关的异质性.
- 在考虑光功率和波长偏移时,曲率测试使得角度估计具有约3.25°的根平均平方误差.
结论:
- 开发的光纤嵌入肌是一种多功能智能结构.
- 它可以作为各种应用的结构元件和传感器.
- 该设备为先进的肌驱动执行器和智能结构监控提供了有前途的方法.
相关概念视频
01:15Strain and Elastic Modulus
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
01:15Design Example: Strain Gauge Bridge or Wheatstone Bridge
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
01:19Thermal Strain
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
01:12Temperature Dependent Deformation
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
01:27Measurements of Strain
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...