Qualitative and Quantitative Metrics for Evaluating the Resulting Acceleration in Random Positioning Machines (RPM)

IF 1.3 4区工程技术 Q2 ENGINEERING, AEROSPACE

Microgravity Science and Technology Pub Date : 2025-06-05 DOI:10.1007/s12217-025-10185-5

Henri Paetz, Elmar Woschke

引用次数: 0

Abstract

The Random Positioning Machine (RPM) is a widely used method to alter the impact of gravity on biological systems by means of averaging the gravitational vector through random rotation. The aim of this work is to analyze the real motion of an RPM by qualitatively and quantitatively evaluating the resulting acceleration with regard to its averaging and uniform distribution. A scalable measuring device was developed that allows long-term measurements at several measuring points simultaneously. Acceleration averaging over time is depicted more generally for RPM motion using moving averages. The density representation on a sphere and the statistics according to Giné enable an evaluation of the distribution of gravity. The investigated metrics do not yet allow a direct statement about the suitability of simulated microgravity for biological experiments, but can serve as a basis for improvements to the RPM movement.

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随机定位机（RPM）产生加速度的定性和定量评价方法

随机定位机（RPM）是一种广泛使用的方法，通过随机旋转平均重力矢量来改变重力对生物系统的影响。这项工作的目的是通过定性和定量地评估其平均和均匀分布的结果加速度来分析RPM的真实运动。开发了一种可扩展的测量装置，可以同时在多个测量点进行长期测量。随时间的加速度平均更一般地描述为使用移动平均的RPM运动。球体上的密度表示和根据gin的统计量可以估计重力的分布。所调查的指标还不能直接说明模拟微重力对生物实验的适用性，但可以作为改进RPM运动的基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Microgravity Science and Technology 工程技术-工程：宇航

CiteScore

3.50

自引率

44.40%

发文量

期刊介绍： Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology