Research on interstage magnetic couple effect of LCICL

In order to better meet the future high precision task requirements, the DFP(Disturbance-Free Payload) spacecraft composed of non-contact PM(Payload Module)and SM(Support Module)is taken as the object to study the relative motion dynamics modeling and control between the two modules and verify the system vibration isolation performance. Firstly, the force and torque expressions of the two modules are derived by simplifying the configuration and analyzing the stress. In view of that couple effect, the relative motion dynamics equations between two modules of DFP spacecraft with high model accuracy, and simple and uniform format are established with the dual quaternions. Based on this, the PD control law is designed, and the relative motion of PM and SM could meet DFP spacecraft working requirements when the measurability of control quantity and the measurement error of sensors were taken into account. Simulation results verify the advantage of vibration isolation and attitude maneuverability of DFP spacecraft.

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Dielectric and Magnetoelectric Properties of Nano-Microscale Lead-Free Composite by 0.4Co-Ferrite and 0.6(K0.5Na0.5)NbO3-Based Ferroelectric Matrix

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.80-81.271 ◽

2011 ◽

Vol 80-81 ◽

pp. 271-275

Author(s):

You Xiang Ye ◽

Sheng Hua Zhou ◽

Yun Zhou

Keyword(s):

Ferroelectric Materials ◽

Lead Free ◽

X Ray Diffraction ◽

X Ray ◽

Magnetoelectric Composites ◽

Voltage Coefficient ◽

Materials Used ◽

Couple Effect ◽

Very High ◽

Potential Use

Lead-free multiferroic magnetoelectric composites were prepared by incorporating the dispersed 0.4CoFe2O4ferromagnetic nanoparticles into 0.6(K0.5Na0.5)NbO3-LiSbO3ferroelectric micromatrix. From the x-ray diffraction analysis, it was observed that almost no chemical reaction occurs between the ferrite and the ferroelectric materials used to form the composite. Dielectric properties as a function of frequency were measured. The magnetoelectric couple effect was given as a function of magnetic field with a maximum magnetoelectric voltage coefficient of 15.01mV·cm-1·Oe-1at 1kHz, which was a very high value in the lead-free magnetoelectric composites system for the potential use on actuators and sensors, etc.

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Resistance of Soil to a Vertically Vibrating Pile

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.979 ◽

2013 ◽

Vol 712-715 ◽

pp. 979-983

Author(s):

Zhan Shi Gao ◽

Qing Ren

Keyword(s):

Slenderness Ratio ◽

Damping Ratio ◽

Large Diameter ◽

Three Dimensional ◽

Horizontal Displacement ◽

Vertical Vibration ◽

Vibration Model ◽

Couple Effect ◽

Soil Dynamic ◽

Strain Model

Based on the plane strain model, a three-dimensional vibration model was setup for soil dynamic response of soil surrounding large diameter pile. An accurate analytical solution was got by considering the couple effect of vertical and horizontal displacement of soil. Through the discussion parameters slenderness ratio (L/d), hysteretic damping ratio (Ds,Dv) and soil Poisson's ratio (ν),it is concluded that they are very important for the vertical vibration propproperties of soil impedance.

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Tunnel temperature fields analysis under the couple effect of convection-conduction in cold regions

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2017.03.143 ◽

2017 ◽

Vol 120 ◽

pp. 378-392 ◽

Cited By ~ 22

Author(s):

Yanhua Zeng ◽

Kelin Liu ◽

Xiaohan Zhou ◽

Lei Fan

Keyword(s):

Temperature Fields ◽

Cold Regions ◽

Couple Effect

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Psychopedagogic Counseling for Twins and Twin Families

Acta geneticae medicae et gemellologiae ◽

10.1017/s0001566000014471 ◽

1976 ◽

Vol 25 (1) ◽

pp. 384-385

Author(s):

G. Bonanni ◽

R. Tatarelli ◽

U. Godai

Keyword(s):

Social Environment ◽

Therapeutic Interventions ◽

Counseling Service ◽

Social Maladjustment ◽

Limited Sample ◽

The Family ◽

Per Se ◽

Twin Families ◽

Couple Effect ◽

Academic Year

In 1973 the Mendel Institute, within the specialized services it offers to Italian twins, instituted psychopedagogic counseling for twins and their families. This service is carried out in the intermediate field between neuropsychiatry and social work. Cases involving family and social maladjustment were referring for counseling. During the academic year 1973-1974, the service examined 96 cases, of which 58 involved problems of school retardation and 38 involved family maladjustment because of changed parent-twin relationships. The counseling service aimed at achieving improved family and school relationships by means of various therapeutic interventions. The psychopedagogic counseling, besides the immediate therapy, has permitted deeper study of maladjustment by means of analyses of the twins' condition as a possible additional cause of the maladjustment itself. Analysis of the cases in this limited sample would seem to indicate an indirect incidence of the twin situation per se (couple effect), somewhat emphasized by the family and social environment.

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The Unsteady Pre-Stall Behavior of the Spike-Type Rotating Stall Within an Airfoil Vaned-Diffuser

Volume 2A: Turbomachinery ◽

10.1115/gt2018-76145 ◽

2018 ◽

Author(s):

Jiayi Zhao ◽

Guang Xi ◽

Zhiheng Wang ◽

Yang Zhao

Keyword(s):

Pressure Rise ◽

Leading Edge ◽

Suction Side ◽

Rotating Stall ◽

Vaned Diffuser ◽

Stall Inception ◽

Impeller Outlet ◽

Inception Point ◽

Transient Measurement ◽

Couple Effect

The spike-type rotating stall (RS) inception inside the vaned-diffuser, which seriously restricts the performance range and brings the problems of blade fatigue, still seems to be a ‘mystery’ since its randomness. The paper intends to explain the mechanisms of this stall inception. To quantitatively assess the critical unsteady behavior to the initiation of RS inception, the transient measurement characterizes the process falling into the RS through the parameter of ‘blade passing irregularity’. The underlying vortex disturbance, related to the growing of the flow complexity and the final spike-type precursor, is further revealed by the full-annulus simulation. The results show the propagation principle of the vortexes from the design to the stall inception point, reflected by the distribution of ‘blade passing irregularity’. The performance change of different sub-components due to the vortex behavior is presented. At the RS limit, the sudden ramp-up of the ‘blade passing irregularity’ near the leading edge (LE), accompanied with the drop of the static pressure rise in the sub-component between the semi-vaneless and throat, corresponds to the spike-type inception in the form of a clockwise vortex connecting the suction side of the diffuser vane and the pressure side of the adjacent vane. Besides, when approaching the spike-type inception point, the couple effect of the growing potential of the diffuser vane and the enhanced vortex disturbance at the impeller outlet degrades the diffuser inlet flow.

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