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相关概念视频

Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

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When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
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Kinematic Equations - II01:17

Kinematic Equations - II

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The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
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Kinematic Equations - III01:18

Kinematic Equations - III

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The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
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Kinematic Equations - I01:26

Kinematic Equations - I

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When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
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Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
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Kinetic Energy for a Rigid Body01:13

Kinetic Energy for a Rigid Body

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Imagine a solid object involved in a general planar movement, with its center of mass pinpointed at a spot labeled G. The object's kinetic energy relative to an arbitrary point A can be quantified for each of its particles - the ith particle in this case. This measurement is achieved through the employment of the relative velocity definition. The position vector, known as rA, extends from point A to the mass element i.
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相关实验视频

Updated: May 7, 2025

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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从动力学中通过直接的同位定位对稳健动力学进行估计.

Kuan Wang1, Linlin Zhang1, Leichao Liang1

  • 1College of Rehabilitation Sciences, Shanghai University of Medicine and Health Sciences, Shanghai, China.

Frontiers in bioengineering and biotechnology
|January 2, 2025
PubMed
概括
此摘要是机器生成的。

与无标记运动捕捉的直接同位定位准确地估计了联合时刻,尽管有噪音的轨迹数据. 这种生物力学方法对一般活动动态表现出强度,未来的工作旨在获得特定主体的准确性.

关键词:
直接的拼接定位是直接的拼接定位.地面反应力是什么?动力学是动力学.运动学的动力学.模拟模拟是指一个模拟模拟.

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An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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相关实验视频

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科学领域:

  • 生物力学和运动分析.
  • 动力学和动力学估计
  • 无标记的动作捕捉技术

背景情况:

  • 准确的关节运动时刻分析在生物力学中对于理解运动至关重要.
  • 无标记运动捕捉为运动分析提供了一个有希望的,非侵入性的方法.
  • 无标记运动捕捉轨迹数据中的噪声可以挑战动力学估计的准确性.

研究的目的:

  • 评估直接合方法用于估计关节时刻的有效性.
  • 评估当联合轨迹数据含有不同级别的噪音时,直接配合的稳定性.
  • 为了研究噪音对行走和坐过程中的动力分析的影响.

主要方法:

  • 模拟噪声 (不同级别和高斯式) 被添加到行走和坐的关节中心轨迹中.
  • 采用了直接定位方法,将联合中心跟踪与生物术语集成到成本函数中.
  • 在噪音条件下计算和比较动力学,关节时刻和地面反应力.

主要成果:

  • 直接排列方法证明了对所有测试的行走和坐噪声水平的关节时刻 (膝盖,脚,部曲) 的可靠估计.
  • 关联时刻的平均绝对误差 (MAE) 仍然相对较低,表明即使有显著的轨道噪声,性能也很好.
  • 对于不同的联合时刻和噪声条件,详细说明了行走和坐任务的特定MAE值.

结论:

  • 通过跟踪和生物术语增强的直接拼接方法,可靠地从无噪声标记器的移动捕捉数据中估计了联合时刻.
  • 目前的方法更适合于一般活动动态,而不是特定学科的临床应用.
  • 未来的研究应该专注于优化成本函数,以改善稳定性和临床相关性准确性之间的平衡.