scholarly journals Improving magnetic nanothermometry accuracy through mixing-frequency excitation

2021 ◽  
Vol 92 (2) ◽  
pp. 024901
Author(s):  
Silin Guo ◽  
Jay Liu ◽  
Zhongzhou Du ◽  
Wenzhong Liu
Keyword(s):  
Frequency Excitation ◽  
Mixing Frequency

scholarly journals Sum-frequency excitation of coherent magnons

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
Dominik M. Juraschek ◽  
Derek S. Wang ◽  
Prineha Narang
Keyword(s):  
Sum Frequency ◽  
Frequency Excitation

scholarly journals Near-infrared resonant photoacoustic gas measurement using simultaneous dual-frequency excitation

2010 ◽  
Vol 100 (1) ◽  
pp. 189-194 ◽  
Author(s):  
J. M. Rey ◽  
C. Romer ◽  
M. Gianella ◽  
M. W. Sigrist
Keyword(s):  
Near Infrared ◽  
Dual Frequency ◽  
Gas Measurement ◽  
Frequency Excitation

Two-frequency excitation of hydrogen atom

1991 ◽  
Vol 1 (2) ◽  
pp. 131-135 ◽  
Author(s):  
G. Casati ◽  
I. Guarneri ◽  
D.L. Shepelyansky
Keyword(s):  
Hydrogen Atom ◽  
Frequency Excitation

Estimation of the Linearized Damping Coefficients of a Squeeze-Film Vibration Isolator

1987 ◽  
Vol 201 (3) ◽  
pp. 181-191 ◽  
Author(s):  
R Stanway ◽  
R Firoozian ◽  
J E Mottershead
Keyword(s):  
Single Frequency ◽  
Squeeze Film ◽  
Experimental Facility ◽  
Vibration Isolator ◽  
New Approach ◽  
Filtering Algorithm ◽  
Damping Coefficients ◽  
Performance Predictions ◽  
Frequency Excitation ◽  
Extract Information

In this paper the authors present experimental confirmation of the feasibility of a new approach to the estimation of the four damping coefficients associated with a squeeze-film vibration isolator. The design and construction of the experimental facility is described in detail. A time-domain filtering algorithm is applied to process the displacement responses to single-frequency excitation and thus extract information on the linearized dynamics of the squeeze-film. The estimated coefficients are validated by comparing performance predictions with those obtained from spectrum analysis and from short-bearing theory. The significance of the results is discussed and suggestions are made for further work in this area.

SIMP for Complex Structures

2016 ◽  
Vol 846 ◽  
pp. 535-540
Author(s):  
David J. Munk ◽  
David W. Boyd ◽  
Gareth A. Vio
Keyword(s):  
Natural Frequencies ◽  
Dynamic Loads ◽  
Topology Optimisation ◽  
Complex Structures ◽  
Structural Failure ◽  
Frequency Range ◽  
Aerodynamic Loading ◽  
Frequency Excitation ◽  
Wing Structure ◽  
Lifting Surfaces

Designing structures with frequency constraints is an important task in aerospace engineering. Aerodynamic loading, gust loading, and engine vibrations all impart dynamic loads upon an airframe. To avoid structural resonance and excessive vibration, the natural frequencies of the structure must be shifted away from the frequency range of any dynamic loads. Care must also be taken to ensure that the modal frequencies of a structure do not coalesce, which can lead to dramatic structural failure. So far in industry, no aircraft lifting surfaces are designed from the ground up with frequency optimisation as the primary goal. This paper will explore computational methods for achieving this task.This paper will present a topology optimisation algorithm employing the Solid Isotropic Microstructure with Penalisation (SIMP) method for the design of an optimal aircraft wing structure for rejection of frequency excitation.

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