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.
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: In this article, a new type of mass-measurement system under weightless conditions is proposed which uses a dynamic vibration absorber as a measuring device, where an object to be measured is fixed to a rotating table (rotor) at a distance from the rotation axis.
Abstract: A new type of mass-measurement system under weightless conditions is proposed which uses a dynamic vibration absorber as a measuring device. In this system, an object to be measured is fixed to a rotating table (rotor) at a distance from the rotation axis. Since it makes the rotor unbalanced, a centrifugal force whose amplitude is proportional to the mass is generated during rotation. It works as a harmonic excitation and forces a structure supporting the table to vibrate. However, a dynamic vibration absorber attached to the structure is tuned or controlled to reduce the vibration to zero. When the structure does not move at all, the absorber mass vibrates in such a way that the product of the mass and the displacement amplitude is equal to the amount of unbalance, that is, the product of the mass to be measured and its distance from the rotation axis. Therefore, the mass of the object is determined by measuring the displacement amplitude of the absorber mass. In this study, the principles and features of the proposed mass-measurement system are clarified. Experiments are carried out with a developed apparatus having an active dynamic vibration absorber. This apparatus can perform measurement at various rotational speeds because the absorber’s natural frequency can be tuned by a feedback parameter. Experimental results demonstrate the feasibility of the proposed mass-measurement system.
15 citations
01 Jan 2002
8 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