Mass measurement using a system containing an on-off relay with dead zone
05 Aug 2002-Vol. 1, Iss: 1, pp 25-25
TL;DR: In this article, a mass measurement system using the self-excited oscillation of a nonlinear system is developed, which contains an on-off relay with dead zone and switches force acting on the object in relation to the position.
Abstract: Concerns mass measurement under conditions of weightlessness. A mass measurement system using the self-excited oscillation of a nonlinear system is developed. The system contains an on-off relay with dead zone and switches force acting on the object in relation to the position. The mass of the object is determined from the time interval measurement of the on-state and off-state periods. The measurement accuracy is experimentally studied.
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TL;DR: In this paper, the effects of system parameters and disturbances on measurement accuracy were examined experimentally using an on-off relay with hysteresis and switches force acting on the object in relation to its velocity.
Abstract: Mass measurement using a relay feedback system was studied experimentally. The measurement system has an on-off relay with hysteresis and switches force acting on the object in relation to its velocity. Such nonlinear control induces a limit cycle in the feedback system. The mass of the object is determined from the period of this limit cycle. The apparatus manufactured for experimental study uses two voice coil motors (VCM's), one of which is for driving the object and the other is for generating prescribed disturbances. The effects of system parameters and disturbances on measurement accuracy were examined experimentally.
14 citations
Proceedings Article•
01 Jan 2003TL;DR: A review of mass measurement under weightless conditions is presented in this article, where various measurement methods are listed with comments on the problems of several conventional methods and a summary of the works conducted by the author.
Abstract: A review of mass measurement under weightless conditions is presented. Various measurement methods are listed with comments on the problems of several conventional methods. It is followed by a summary of the works conducted by the author.
7 citations
TL;DR: A review of mass measurement devices developed by the author is presented in this paper, where the treated devices are classified into two types: the first type uses a dynamic vibration absorber as a device for both mass measurement and vibration control.
Abstract: A review of mass measurement devices developed by the author is presented. According to the measurement principles, the treated devices are classified into two types. The first type uses a dynamic vibration absorber as a device for both mass measurement and vibration control. The main advantage is no vibration transmitted into the surrounding structures during measurement. The second type uses relay feedback. The advantages are simpler mechanism and robustness against disturbances. In this article, the principles of measurement of each type are presented.
6 citations
21 Oct 2008
TL;DR: In this paper, a relay-feedback mass measurement system that uses a relay with hysteresis and feeds back the velocity of the object has been proposed, and an estimating equation including this effect is derived.
Abstract: This paper treats a relay-feedback mass measurement system that uses a relay with hysteresis and feeds back the velocity of the object. The efficacy of the proposed method has been already confirmed experimentally. In actual measurement, however, a spring-like element must be added for avoiding the drift of the object. The effect of this spring on mass estimation has not been investigated analytically. In this paper, an estimating equation including this effect is derived. The derived equation indicates that the estimated mass is smaller than the actual value when the conventional estimating equation is used. The experiments carried out in the fabricated apparatus support well the validity of the derived estimating equation.
4 citations
Cites background or methods from "Mass measurement using a system con..."
...Various methods of measuring mass under weightless conditions have been proposed [1-10]....
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...The authors have proposed to apply relay feedback to mass measurement [9, 10]....
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...One of them uses an on-off relay with dead zone and feeds back the displacement of an object to be measured [9]....
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TL;DR: In this article, the applicability of relay feedback to mass measurement was investigated both theoretically and experimentally, and two mass measurement systems were studied both theoretically, experimentally and empirically: one uses an on-off relay with hysteresis and switches force acting on the object in relation to the velocity of the object.
Abstract: The applicability of relay feedback to mass measurement was investigated. Two mass measurement systems were studied both theoretically and experimentally. One of them uses an on-off relay with hysteresis and switches force acting on the object in relation to the velocity of the object. The other contains an on-off relay with dead zone and switches force acting on the object in relation to the displacement. The principle of measurement, a fabricated apparatus and measurement results were presented for each measurement system.
2 citations
Cites background or methods from "Mass measurement using a system con..."
...Two types of measurement systems are possible (Mizuno 2002 and Mizuno et al. 2005)....
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...This tendency is more apparent when 0 F is small (Mizuno et al., 2005)....
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...This tendency is more apparent when 0F is small (Mizuno et al., 2005)....
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...Figure 7 shows a block diagram of its control system (Mizuno et al., 2005)....
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...Figure 9 show a schematic drawing of an apparatus developed for experimental study on the position-feedback type (Mizuno et al., 2005)....
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References
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TL;DR: It is shown that FCM is an accurate and more desirable mass-measurement method under weightless conditions through the results of the experiment.
Abstract: In this paper, we propose an accurate mass-measurement method under weightless conditions that is termed the “frequency-controlled method (FCM)”. Under weightless conditions such as in space-based laboratories, it is impracticable to use the mass-measurement systems we conventionally use on earth, because they make use of gravity. The gravity in a space laboratory is said to be only 1 10000 to 1 1000 times as much as that on the earth. Therefore, the establishment of mass-measurement methods under weightless conditions is indispensable for space development. In the following, we explain the principle of FCM, and show that FCM is an accurate and more desirable mass-measurement method under weightless conditions through the results of the experiment.
34 citations
TL;DR: In this article, a method for efficiently and accurately measuring mass under conditions of weightlessness is proposed using the law of conservation of momentum, where the velocities of two different uniform motion states of an object and the reference mass are measured highly accurately using an optical interferometer.
Abstract: A method for efficiently and accurately measuring mass under conditions of weightlessness is proposed using the law of conservation of momentum. In this method, the velocities of two different uniform motion states of an object and the reference mass are measured highly accurately using an optical interferometer. For the preparatory experiments on earth, an instrument, with which linear motion of constant velocity is realized using pneumatic linear bearings, is developed. The combined standard uncertainty in mass measurements from 4 to 18 kg by a single collision is estimated to be about u c = 0.012 kg, which corresponds to 0.07% (7 x 10 -4 ) of the maximum value of 18 kg. For a mass-measurement instrument employed under microgravity conditions, a design for the instrument and a measurement procedure are proposed.
29 citations
TL;DR: The estimates of accuracy of mass measurement by this device are given, and the results of measuring the masses of cosmonauts' bodies on the Salyut 5 and 6 orbital stations are presented.
Abstract: The problem considered in this paper is the investigation of the properties of a massmeter, i.e. the device for determining the mass of cosmonaut's body under zero-gravity conditions. The estimates of accuracy of mass measurement by this device are given, and the results of measuring the masses of cosmonauts' bodies on the Salyut 5 and 6 orbital stations are presented.
24 citations
18 citations