scholarly journals Nano-Dimensional Analysis of High-Performance Nd-Fe-B-Based Magnetic Materials for Micro-Structural Control

2012 ◽  
Vol 76 (1) ◽  
pp. 17-26 ◽  
Author(s):  
Masaru Itakura ◽  
Noriyuki Kuwano
Keyword(s):  
Magnetic Materials ◽  
Dimensional Analysis ◽  
Structural Control ◽  
High Performance

A New X-Actuator Design for Controlling Wing Bending and Twisting Modes

1999 ◽  
Author(s):  
R. Ye ◽  
J. H. Ding ◽  
H. S. Tzou
Keyword(s):  
Structural Control ◽  
High Performance ◽  
Fe Method ◽  
Aerodynamic Efficiency ◽  
Aircraft Wings ◽  
Helicopter Blades ◽  
Active Structural Control ◽  
Trailing Edges ◽  
Parallel Configuration ◽  
Actuator Design

Abstract Recent development of smart structures and structronic systems has demonstrated the technology in many engineering applications. Active structural control of aircraft wings or helicopter blades (e.g., shapes, flaps, leading and/or trailing edges) can significantly enhance the aerodynamic efficiency and flight maneuverability of high-performance airplanes and helicopters. This paper in to evaluate the dual bending and torsion vibration control effects of an X-actuator configuration reconfigured from a parallel configuration. Finite element (FE) formation of a new FE using the layerwise constant shear angle theory is reviewed and the derived governing equations are discussed. Bending and torsion control effects of plates are studied using the FE method and also demonstrated via laboratory experiments. FE and experimental results both suggest the X-actuator is effective to both bending and torsion control of plates.

An Active-Passive Piezoelectric Vibration Absorber for Structural Control Under Harmonic Excitations With Time-Varying Frequency

2000 ◽  
Author(s):  
Ronald A. Morgan ◽  
K. W. Wang
Keyword(s):  
Active Control ◽  
Structural Control ◽  
High Performance ◽  
Piezoelectric Materials ◽  
Negative Resistance ◽  
Electrical Circuit ◽  
Superior Performance ◽  
Electrical Networks ◽  
Harmonic Excitations ◽  
Time Varying Frequency

Abstract It has been shown that piezoelectric materials can be used as passive electromechanical vibration absorbers when shunted by electrical networks. Semi-active piezoelectric absorbers have also been proposed for suppressing harmonic excitations with varying frequency. However, these semi-active devices have limitations that restrict their applications. The design presented here is a high performance active-passive alternative to semi-active absorbers that uses a combination of a passive electrical circuit and active control actions. The active control consists of three parts: an adaptive inductor tuning action, a negative resistance action, and a coupling enhancement action. A formulation for the optimal tuning of the piezoelectric absorber inductance on a multiple degree of freedom (MDOF) structure is derived. The effectiveness of the proposed system is demonstrated experimentally on a system under a variable frequency excitation. Extensive parameter studies are also carried out to show that the proposed design offers superior performance and efficiency compared to other state-of-the-art control methods.

Technology Development for Transition Metal-Rare Earth High-Performance Magnetic Materials

1973 ◽  
Author(s):  
J. J. Becker ◽  
M. G. Benz ◽  
R. E. Cech ◽  
R. J. Charles ◽  
M. Doser
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Magnetic Materials ◽  
High Performance ◽  
Technology Development

scholarly journals High performance of low cost soft magnetic materials

2011 ◽  
Vol 34 (7) ◽  
pp. 1407-1413 ◽  
Author(s):  
Josefina M. Silveyra ◽  
Emília Illeková ◽  
Marco Coïsson ◽  
Federica Celegato ◽  
Franco Vinai ◽  
...  
Keyword(s):  
Magnetic Materials ◽  
High Performance ◽  
Low Cost ◽  
Soft Magnetic Materials ◽  
Soft Magnetic
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