相关实验视频
Updated: Jul 23, 2025

10:41
Method to Measure Tone of Axial and Proximal Muscle
Published on: December 14, 2011
17.6K
低频角度加速旋转桌的全面校准方法
Renjian Feng1,2, Jiaxuan Yan1,2, Yinfeng Wu1,2
1Key Laboratory of Education Ministry for Precision Opto-Mechatronics Technology, Beijing 100191, China.
Sensors (Basel, Switzerland)
|July 11, 2023
概括
总波扭曲 (THD) 校准了旋转桌的正弦运动,提高了比传统指标更准确的准确性. 这种方法增强了使用组合传感器或光纤陀螺仪的评估.
科学领域:
- 机械工程 机械工程
- 计量学 计量学 计量学
- 控制系统 控制系统
背景情况:
- 旋转表的传统评估依赖于角加速幅度和频率误差,这对于全面的正弦运动校准是不够的.
- 低频角加速旋转表 (LFAART) 需要精确的校准,以获得精确的正弦运动.
- 现有的方法可能无法完全捕捉旋转桌性能的细微差别.
研究的目的:
- 引入总波扭曲 (THD) 作为一个关键指标,用于校准LFAART的侧面运动.
- 开发和验证使用新型测量方案的THD计算方法.
- 通过结合THD.来提高旋转桌性能的评估.
主要方法:
- 从两个不同的测量方案计算THD:光轴编码器和激光三角感应器的新组合,以及使用光纤陀螺仪 (FOG) 的标准方案.
- 实施了改进的倒车时刻识别方法,以提高从光轴编码器数据中确定角度运动幅度的准确性.
- 进行实地实验,比较从不同的测量方案中获得的THD值.
主要成果:
- 该THD指数提供了一个更全面的评估与角加速幅度和频率误差相比,正弦运动.
- 结合的光轴编码器和激光三角感应器方案产生精确的THD值.
- 与FOG方案的比较显示,当FOG信号噪声比超过7.7dB时,THD值的差异为0.11%.
- 改进的倒车时刻识别方法提高了角度运动幅度计算的准确性.
结论:
- 总波扭曲 (THD) 是一个可行且准确的指标,用于校准LFAART的侧面运动.
- 建议的测量方案,特别是联合传感器方法,对于THD计算是有效的.
- 通过实验结果验证了THD方法的准确性,证明了其用于旋转桌校准的可行性.
相关概念视频
Angular Velocity and Acceleration
9.5K
We previously discussed angular velocity for uniform circular motion, however not all motion is uniform. Envision an ice skater spinning with their arms outstretched; when they pull their arms inward, their angular velocity increases. Additionally, think about a computer's hard disk slowing to a halt as the angular velocity decreases. The faster the change in angular velocity, the greater the angular acceleration. The instantaneous angular acceleration is defined as the derivative of...
9.5K
Instrument Calibration
220
Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
220
Rotation with Constant Angular Acceleration - I
6.8K
If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
Using our intuition, we can begin to see how rotational quantities such as angular displacement, angular velocity, angular acceleration, and time are related to one another. For example, if a flywheel...
Using our intuition, we can begin to see how rotational quantities such as angular displacement, angular velocity, angular acceleration, and time are related to one another. For example, if a flywheel...
6.8K
Relative Motion Analysis using Rotating Axes - Acceleration
357
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
Time differentiation is...
357
Relative Motion Analysis using Rotating Axes-Problem Solving
424
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
Here, in order to determine the magnitude of velocity and acceleration for point...
424
Rotation with Constant Angular Acceleration - II
6.0K
Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
The first...
6.0K

