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相关概念视频

Vector Addition of Forces01:23

Vector Addition of Forces

1.0K
When understanding the effects of multiple forces acting on an object, vector addition is a crucial concept to grasp. This mathematical concept can be used to calculate the net force acting on an object when two or more forces are involved.
To understand the concept of vector addition, consider the scenario of a ship being pulled by two small tugboats. The two forces, F1 and F2, act concurrently on the ship in different directions. The parallelogram law can be used to calculate the net force...
1.0K
Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

660
A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
660
Cartesian Form for Vector Formulation01:26

Cartesian Form for Vector Formulation

626
The Cartesian form for vector formulation is a process to calculate  the moment of force using the position and force vectors. The moment of force is defined as the cross-product of these vectors, making it a vector quantity. The Cartesian form of the position and force vectors involves unit vectors, which can be used to express the cross-product in determinant form.
626
Two-Dimensional Force System01:20

Two-Dimensional Force System

898
A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
898
Method of Joints: Problem Solving II01:30

Method of Joints: Problem Solving II

566
Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.
566
Method of Joints: Problem Solving I01:30

Method of Joints: Problem Solving I

1.1K
The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
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一种方法来计算在睡眠姿势期间的人-床接口的矢量力,利用图像记录.

Ying Gao1, Jing Zhang1, Chengzhao Zou1

  • 1Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China.

Scientific reports
|July 2, 2024
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概括

研究人员开发了一种新方法来计算睡眠期间的人-床接口力量. 这种技术准确地预测肌肉骨负荷,有助于更好的床设计和睡眠健康.

关键词:
图像的注册 图像的注册肌肉骨模拟系统的模拟睡觉的位置 睡觉的位置矢量力是一种向量力.

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科学领域:

  • 生物力学 生物力学
  • 人与计算机的交互
  • 材料科学 材料科学 材料科学

背景情况:

  • 了解人 - 床接口力量对于预测睡眠期间肌肉骨负荷至关重要.
  • 目前的生物机械模型依赖于准确的力分布数据来获得可信度.

研究的目的:

  • 引入一种新的方法来计算人床接口的矢量力.
  • 验证拟议方法在预测肌肉骨负荷方面的准确性.

主要方法:

  • 使用真空床和3D扫描仪记录卧底和横向位置的身体痕.
  • 使用图像记录来使身体压力分布与床变形数据保持一致.
  • 每单位面积计算的矢量力值 (36.25 mm × 36.25 mm).

主要成果:

  • 垂直力成分平均为体重的98.67%±7.21%,显示出良好的一致性.
  • 水平力成分平均为身体重量的2.18%±1.77%.
  • 使用计算的矢量力时,预测的肌肉活动与测量活动相关 (相关系数>0.7).

结论:

  • 这种新的方法准确地量化了人与床界面向量力量.
  • 这种方法提高了对睡眠相关的肌肉骨负荷的理解.
  • 研究结果为优化床设计和评估提供了宝贵的见解,以改善睡眠健康.