使用光电电池系统和GRS80特定位置引力加速的跳跃功率估计精度提高
J L González-Montesinos1, F G Montesinos2,3, J R Fernández Santos1
1Department of Physical Education, Faculty of Education Sciences, University of Cádiz. 11510 Cádiz, Spain.
Sensors (Basel, Switzerland)
|August 28, 2025
概括
准确计算运动功率需要考虑当地的重力变化. 这项研究发现,使用局部重力值显著改善了跳跃功率计算,与标准重力常数不同.
科学领域:
- 运动科学
- 生物力学
- 地质学
背景情况:
- 运动功率计算通常使用标准重力值 (g = 9.81 m·s-2).
- 这个标准值是不准确的,因为重力随高度和度而变化.
- 精确的功率测量对于运动中的性能分析至关重要.
研究的目的:
- 为了提高跳跃功率计算的精度.
- 调查当地的重力变化对功率估计的影响.
- 使用标准与局部重力值进行功率计算.
主要方法:
- 一个带有红外LED的光电池系统被用来测量跳跃飞行和降落时间.
- 十名排球运动员进行了重复的跳跃测试 (15,30,60秒).
- 用34个位置的地质参考系统 (GRS80) 的标准重力值和局部重力值来计算功率.
主要成果:
- 在标准和局部重力值之间观察到显著的计算功率差异.
- 在使用标准值时,更高的位置显示低估了功率.
- 在使用标准值时,较低的海拔位置显示过高的功率.
结论:
- 实验的地理位置显著影响跳跃功率的计算.
- 为了提高准确度,建议使用GRS80等局部重力值.
- 准确的重力补偿对于可靠的体育表现指标至关重要.
相关概念视频
Measuring Acceleration Due to Gravity
673
Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
673
Field Application of Global Positioning System
88
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
88
Variation in Acceleration due to Gravity near the Earth's Surface
2.5K
An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's...
The difference between the true and apparent weights is proportional to the square of the Earth's...
2.5K
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device
168
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
168
Errors in Global Positioning System
111
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
111
Types of Global Positioning System Surveys
118
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
118


