An inertial balance is a device that allows the measurement of inertial mass (as opposed to gravitational mass for a regular balance) that can be operated in the microgravity environment space where weight is negligible (e.g. in the International Space Station.) The principle of operation is based on a vibrating spring-mass system. The frequency of vibration will depend on the unknown mass, being higher for lower mass. The object to be measured is placed in the inertial balance, and a manual initial displacement of the spring mechanism starts the oscillation. The time needed to complete a given number of cycles is measured. Knowing the characteristic spring constant and damping coefficient of the spring system, the mass of the object can be computed according to the harmonic oscillator mod
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| - Inertial balance (en)
- Balance inertielle (fr)
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| - An inertial balance is a device that allows the measurement of inertial mass (as opposed to gravitational mass for a regular balance) that can be operated in the microgravity environment space where weight is negligible (e.g. in the International Space Station.) The principle of operation is based on a vibrating spring-mass system. The frequency of vibration will depend on the unknown mass, being higher for lower mass. The object to be measured is placed in the inertial balance, and a manual initial displacement of the spring mechanism starts the oscillation. The time needed to complete a given number of cycles is measured. Knowing the characteristic spring constant and damping coefficient of the spring system, the mass of the object can be computed according to the harmonic oscillator mod (en)
- Une balance inertielle est un dispositif qui permet de mesurer la masse inertielle (par opposition à la masse gravitationnelle pour une balance ordinaire) et qui peut être utilisé dans une environnement de microgravité où le poids est négligeable (p. ex., dans la Station spatiale internationale). (fr)
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| - An inertial balance is a device that allows the measurement of inertial mass (as opposed to gravitational mass for a regular balance) that can be operated in the microgravity environment space where weight is negligible (e.g. in the International Space Station.) The principle of operation is based on a vibrating spring-mass system. The frequency of vibration will depend on the unknown mass, being higher for lower mass. The object to be measured is placed in the inertial balance, and a manual initial displacement of the spring mechanism starts the oscillation. The time needed to complete a given number of cycles is measured. Knowing the characteristic spring constant and damping coefficient of the spring system, the mass of the object can be computed according to the harmonic oscillator model. Alternatively, a calibration of the device with known masses can be performed, so that the spring constant and any appreciable damping will implicitly be accounted for, and need not be separately known or estimated. See the data analysis PDF under External Links below for a discussion of several calibration approaches. (en)
- Une balance inertielle est un dispositif qui permet de mesurer la masse inertielle (par opposition à la masse gravitationnelle pour une balance ordinaire) et qui peut être utilisé dans une environnement de microgravité où le poids est négligeable (p. ex., dans la Station spatiale internationale). Le principe de fonctionnement d'une balance inertielle est basé sur un système masse-ressort en vibration. La fréquence de vibration dépend de la masse inconnue : elle est d'autant plus élevée que la masse est faible. L'objet à mesurer est placé dans la balance inertielle, et un mécanisme à ressort déclenche l'oscillation. Le temps nécessaire pour effectuer un nombre donné de cycles est mesuré. Connaissant la constante caractéristique du ressort et le coefficient d'amortissement du système de ressort, la masse de l'objet peut être calculée selon le modèle de l'oscillateur harmonique. (fr)
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