使用部表面加速和低级卡尔曼平滑来估计体气流量.
Arturo Morales1, Juan I Yuz1, Juan Pablo Cortés1
1Department of Electronic Engineering, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile.
概括
这项研究引入了一种新的卡尔曼平滑器,用于通过部表面加速来估计部气流. 该方法显著降低了计算负载和模型顺序,同时保持了准确性,使实时语音分析成为可能.
科学领域:
- 生物工程是生物工程.
- 信号处理 信号处理
- 声学分析 声学分析
背景情况:
- 使用皮肤加速度计在胸外气管上进行非侵入性声功能测量是一种新兴的技术.
- 目前用于估计球气流的方法,如反向过或贝叶斯技术,依赖于亚球阻抗模型,但受到传感器定位错误和模型不匹配的影响,导致计算负担.
- 准确的喉气流估计对于理解声功能和诊断语音障碍至关重要.
研究的目的:
- 开发一种计算效率高的方法,用系统识别和卡尔曼平滑器来估计全身气流.
- 与现有的贝叶斯方法相比,减少模型顺序和计算要求.
- 为了使可穿戴式监控应用程序能够实时估计口气流及其不确定性.
主要方法:
- 采用系统识别技术,以获得低级状态空间表现的亚球阻抗模型.
- 卡尔曼光滑器与减少顺序模型一起使用,以从部表面加速度数据中估计球气流.
- 提出的方法与以前的贝叶斯技术在准确性,模型顺序和计算时间方面进行了比较.
主要成果:
- 拟议的方法实现了94%的模型顺序减少,与以前的贝叶斯方法相比,只需要1.5%的计算时间.
- 卡尔曼光滑器在纠正球气流偏差方面略有提高了准确性.
- 该方法在空气流量估计中提供了一种有价值的不确定性度量,可以适应不同的测量条件.
结论:
- 开发的卡尔曼平滑方法可显著降低计算负载和模型复杂性,用于全球气流估计.
- 该方法实现了与现有技术可比的准确性,同时提供了不确定性量化.
- 这种方法对可穿戴语音监控设备的实时,准确和不确定性意识的球气流估计具有前景.
相关概念视频
Velocity and Acceleration in Steady and Unsteady Flow
108
In fluid mechanics, velocity and acceleration are key concepts for analyzing particle motion in both steady and unsteady flow. Consider a fluid particle moving along a pathline, where its velocity depends on its position and time. The particle's acceleration is obtained by differentiating the velocity with respect to time.
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over...
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over...
108
Bernoulli's Equation for Flow Normal to a Streamline
866
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
866
Bernoulli's Equation for Flow Along a Streamline
980
Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
980
Accelerating Fluids
1.1K
When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
1.1K
Laminar and Turbulent Flow
8.5K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
8.5K
Turbulent Flow
193
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
193


