scholarly journals Mass measurement using the fixed-point of a spring-mass system with a dynamic vibration absorber and an inertial-mass vibrator

2015 ◽  
Vol 2 (5) ◽  
pp. 14-00565-14-00565 ◽  
Author(s):  
Tomoyuki KORIKAWA ◽  
Yuji ISHINO ◽  
Masaya TAKASAKI ◽  
Takeshi MIZUNO
Keyword(s):  
Fixed Point ◽  
Mass Measurement ◽  
Inertial Mass ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Mass System ◽  
Dynamic Vibration

scholarly journals Mass Measurement Using the Fixed Point of a Spring-Mass System with a Dynamic Vibration Absorber

2012 ◽  
Vol 6 (3) ◽  
pp. 241-250 ◽  
Author(s):  
Satoru YAMAMOTO ◽  
Yuji ISHINO ◽  
Masaya TAKASAKI ◽  
Takeshi MIZUNO
Keyword(s):  
Fixed Point ◽  
Mass Measurement ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Mass System ◽  
Dynamic Vibration

Mass Measurement System Using an Undamped Dynamic Vibration Absorber for Weightless Conditions

2003 ◽  
Author(s):  
Takeshi Mizuno ◽  
Shinsuke Sato
Keyword(s):  
Measurement System ◽  
Measurement Accuracy ◽  
Mass Measurement ◽  
Inertial Mass ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration ◽  
System A ◽  
Measurement Object ◽  
Type Mass

A new vibration-type mass measurement system with an undamped dynamic vibration absorber was developed. In the developed system, a measurement object is attached to the inertial mass of the vibration generator instead of the absorber mass. It has an advantage that the tuning condition of the absorber is not influenced by the mass of measurement objects. The measurement accuracy of the developed system was estimated experimentally when it was fixed on a massive base and on a flexible structure. The results demonstrated that measurement accuracy was almost same in both the cases. It was also shown that the vibration of the table in transient states was reduced by increasing the excitation signal gradually from zero to an amplitude for measurement.

Application of Dynamic Vibration Absorbers to Mass Measurement

1997 ◽  
Author(s):  
Takeshi Mizuno
Keyword(s):  
Measurement System ◽  
Mass Measurement ◽  
Vibration Absorber ◽  
Rotational Axis ◽  
Automatic Frequency ◽  
Dynamic Vibration Absorber ◽  
Measuring Device ◽  
Supporting Structure ◽  
Dynamic Vibration ◽  
Auxiliary Mass

Abstract A mass measurement system which uses a dynamic vibration absorber as measuring device is developed. It can measure mass even under weightless conditions like in space stations. In this system, an object to be measured is fixed to a rotating table (rotor) at a distance from the rotational axis. Since it makes the rotor unbalanced, a centrifugal force causes the supporting structure to vibrate during rotation. A dynamic vibration absorber attached to the structure is tuned or controlled to cancel the excitation force. When the structure does not vibrate, the amplitude of motion of the auxiliary mass equals the ratio of the amount of unbalance to the auxiliary mass. Therefore, the mass of the object is determined from the motion of the auxiliary mass. According to the measurement principles, the vibration of the supporting structure must be eliminated. A servocompensator with the performance of automatic frequency tracking is applied to reduce the vibration. Experimental results demonstrate that mass can be measured accurately with the developed measurement system.

Optimal Design of an Inerter-Based Dynamic Vibration Absorber Connected to Ground

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Shaoyi Zhou ◽  
Claire Jean-Mistral ◽  
Simon Chesne
Keyword(s):  
Fixed Point ◽  
Optimal Design ◽  
Transient Response ◽  
Damping Ratio ◽  
Vibration Absorber ◽  
Practical Implementation ◽  
Primary System ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration ◽  
The Stability

Abstract This paper addresses the optimal design of a novel nontraditional inerter-based dynamic vibration absorber (NTIDVA) installed on an undamped primary system of single degree-of-freedom under harmonic and transient excitations. Our NTIDVA is based on the traditional dynamic vibration absorber (TDVA) with the damper replaced by a grounded inerter-based mechanical network. Closed-form expressions of optimal parameters of NTIDVA are derived according to an extended version of fixed point theory developed in the literature and the stability maximization criterion. The transient response of the primary system is optimized when the coupled system becomes defective, namely having three pairs of coalesced conjugate poles, the proof of which is also spelt out in this paper. Moreover, the analogous relationship between NTIDVA and electromagnetic dynamic vibration absorber is highlighted, facilitating the practical implementation of the proposed absorber. Finally, numerical studies suggest that compared with TDVA, NTIDVA can decrease the peak vibration amplitude of the primary system and enlarge the frequency bandwidth of vibration suppression when optimized by the extended fixed point technique, while the stability maximization criterion shows an improved transient response in terms of larger modal damping ratio and accelerated attenuation rate.

Development of Mass Measurement Devices for Zero-Gravity Experiments

2010 ◽  
Vol 36 ◽  
pp. 21-30 ◽  
Author(s):  
Takeshi Mizuno
Keyword(s):  
Vibration Control ◽  
Mass Measurement ◽  
Vibration Absorber ◽  
Zero Gravity ◽  
Relay Feedback ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration ◽  
Measurement Devices

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.

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