scholarly journals Rotational Mass Shedding from Asteroid (6478) Gault

2021 ◽  
Vol 910 (2) ◽  
pp. L27
Author(s):  
Jane X. Luu ◽  
David C. Jewitt ◽  
Max Mutchler ◽  
Jessica Agarwal ◽  
Yoonyoung Kim ◽  
...  
Keyword(s):  
Rotational Mass

Rotational mass loss by Be stars

2003 ◽  
Vol 47 (10) ◽  
pp. 826-830 ◽  
Author(s):  
A. V. Tutukov ◽  
A. V. Fedorova
Keyword(s):  
Mass Loss ◽  
Be Stars ◽  
Rotational Mass

A Study on Controllable Aseismic Device With Inertia Mass and MR Fluid

2013 ◽  
Author(s):  
Hiroshi Sodeyama ◽  
Kazuhiko Shibata ◽  
Yusuke Sato ◽  
Tetsuya Tomizawa ◽  
Hideo Fujitani
Keyword(s):  
Magnetic Field ◽  
Dynamic Characteristics ◽  
Experimental Testing ◽  
Inertial Force ◽  
Ball Screw ◽  
Mr Fluid ◽  
Prototype Device ◽  
Magneto Rheological ◽  
Force Displacement ◽  
Rotational Mass

The authors have developed a new aseismic device, which has a ball screw and rotational mass. It not only generates the resistive inertial force originating in the rotational mass but also dissipates the energy of vibration through a viscous damping mechanism. Furthermore, the damping capability of the device can be controlled externally with an applied magnetic field. A magneto-rheological (MR) fluid is used to change the dynamic characteristics of the device. Through comprehensive experimental testing of a prototype device, the dynamic characteristics of the device have been verified. The test results show that the force-displacement relationship varies with an applied magnetic condition. Only a few amperes of electric current is required to generate a magnetic field effective for the prototype device with a capacity of 100kN.

Collective motions in nuclei and the spectrum generating algebras T5 × SO(3), GL(3,R), and CM(3)

1976 ◽  
Vol 54 (9) ◽  
pp. 970-996 ◽  
Author(s):  
P. Gulshani ◽  
D. J. Rowe
Keyword(s):  
Discrete System ◽  
Quantum Mechanical ◽  
Body System ◽  
Quantum Mechanical System ◽  
Many Body ◽  
Straightforward Generalization ◽  
Collective Motions ◽  
Collective Hamiltonian ◽  
Full Quantum ◽  
Rotational Mass

Cusson's classical treatment of the collective rotations of a discrete system of N particles is extended to the full quantum mechanical system by means of a straightforward generalization of Villars' canonical transformation. In this manner, Bohr's collective Hamiltonian, with various values for the rotational mass, is microscopically derived. The nature and criteria for the existence of various collective flows in a many-body system are also given. The collective parts of the Hamiltonian are then separately expressed in original particle coordinates and momenta and in this manner the possibility of microscopic calculations for the collective motions is suggested. Finally appropriate microscopic Hamiltonians for the S.G.A.'s T5 × SO(3), GL(3,R), and CM(3) are determined.

scholarly journals Composite Particles with Rotational Mass Levels

1968 ◽  
Vol 40 (2) ◽  
pp. 427-428 ◽  
Author(s):  
Tadashi Miyazaki
Keyword(s):  
Composite Particles ◽  
Rotational Mass

scholarly journals Wave flume testing of an oscillating-body wave energy converter with a tuned inerter

2020 ◽  
Author(s):  
Keita Sugiura ◽  
Ryoko Sawada ◽  
Yudai Nemoto ◽  
Ruriko Haraguchi ◽  
Takehiko Asai
Keyword(s):  
Power Generation ◽  
Body Wave ◽  
Resonance Effect ◽  
Inertial Mass ◽  
Small Scale ◽  
Civil Structures ◽  
Wave Flume ◽  
Wide Range ◽  
Power Generation Performance ◽  
Rotational Mass

In this study, the effectiveness of an oscillating-body WEC with a tuned inerter (TI) proposed by the authors is shown through wave flume testing.The TI mechanism consisting of a tuning spring, a rotational inertial mass, and a viscous damping component is able to increase energy absorption capability by taking advantage of the resonance effect of the rotational mass. This mechanism has been recently introduced for civil structures subjected to external loadings such as earthquakes and winds to decay vibration response immediately. The authors applied this mechanism to oscillating-body WECs and showed that the proposed WEC increased the power generation performance and broadened the effective frequency range without increasing the mass of the buoy itself through numerical simulation studies. To verify the validity of the proposed WEC experimentally, a small-scale prototype of the proposed device is designed and wave flume testing is carried out with various regular wave inputs of different frequencies. The results show that the WEC with the properly adjusted TI mechanism demonstrates better power generation performance compared to the conventional WEC over a wide range of wave frequencies.

Vehicle Dynamics Study under Uncertainty

2014 ◽  
Vol 659 ◽  
pp. 151-156
Author(s):  
George Bivol ◽  
George Ene ◽  
Marian Eduard Radulescu ◽  
Mihai Iacob ◽  
Ion Copae
Keyword(s):  
Vehicle Dynamics ◽  
Front Surface ◽  
Transmission Efficiency ◽  
Point Of View ◽  
Vehicle Dynamic ◽  
Aerodynamic Coefficient ◽  
Onboard Computer ◽  
Mass Coefficient ◽  
Rotational Mass ◽  
Real Test

In all fields, including here technical field, there will always be uncertainties [1,2]; from a quantity point of view uncertainties are a set of values that we can expect. To offer some examples in vehicle dynamic study there will always be uncertainties regarding weight value, rolling radius, rotational mass coefficient, drag coefficient, aerodynamic coefficient, front surface, transmission efficiency etc. [3]. Throughout the paper we call on operations with values intervals and on differential equations with coefficients that have values within certain intervals. Using the well known differential equation for straight movement, certain parameters are analyzed regarding their influences onto the vehicle dynamic behavior. The theoretical achieved results are than compared with results that are reached through real test runs carried onto a vehicle that has gasoline injection, onboard computer, transducers and other built-in actuators. The data offered by these sensors is collected using a data acquisition system.

scholarly journals Experimental characterization and performance improvement evaluation of an electromagnetic transducer utilizing a tuned inerter

2019 ◽  
Vol 26 (1-2) ◽  
pp. 56-72 ◽  
Author(s):  
Keita Sugiura ◽  
Yuta Watanabe ◽  
Takehiko Asai ◽  
Yoshikazu Araki ◽  
Kohju Ikago
Keyword(s):  
Vibration Suppression ◽  
Resonance Effect ◽  
Hysteresis Loops ◽  
Inertial Mass ◽  
Electrical Energy ◽  
Ball Screw ◽  
Electromagnetic Transducer ◽  
Energy Harvesting Efficiency ◽  
And Performance ◽  
Rotational Mass

This research reports on the experimental verification of an enhanced energy conversion device utilizing a tuned inerter called a tuned inertial mass electromagnetic transducer (TIMET). The TIMET consists of a motor, a rotational mass, and a tuning spring. The motor and the rotational mass are connected to a ball screw and the tuning spring interfaced to the ball screw is connected to the vibrating structure. Thus, vibration energy of the structure is absorbed as electrical energy by the motor. Moreover, the amplified inertial mass can be realized by rotating relatively small physical masses. Therefore, by designing the tuning spring stiffness and the inertial mass appropriately, the motor can rotate more effectively due to the resonance effect, leading to more effective energy generation. The authors designed a prototype of the TIMET and conducted tests to validate the effectiveness of the tuned inerter for electromagnetic transducers. Through excitation tests, the property of the hysteresis loops produced by the TIMET is investigated. Then a reliable analytical model is developed employing a curve fitting technique to simulate the behavior of the TIMET and to assess the power generation accurately. In addition, numerical simulation studies on a structure subjected to a seismic loading employing the developed model are conducted to show the advantages of the TIMET over a traditional electromagnetic transducer in both vibration suppression capability and energy harvesting efficiency.

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