Self-Propulsion of a Capsule on a Viscous Surface

2006 ◽  
Author(s):  
Mark McLellan ◽  
Mingxuan Fan ◽  
Z. C. Feng
Keyword(s):  
Piezoelectric Actuator ◽  
Mechanical Model ◽  
Shear Thickening ◽  
Interfacial Interaction ◽  
The Self ◽  
Experimental Setup ◽  
Interfacial Force

We propose a mechanical model for a capsule containing a piezoelectric actuator. The interfacial interaction between the capsule and a surface is assumed to be viscous. Nonlinearity in the interfacial force such as shear thickening is assumed to be present. When periodic excitations are applied to the piezoelectric actuator, the capsule is shown to propel itself. The self-propulsion is confirmed through an experimental setup.

Transient Forced Response Analysis of Mistuned Steam Turbine Blades During Startup and Coastdown

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Christian Siewert ◽  
Heinrich Stüer
Keyword(s):  
Mechanical Model ◽  
Turbine Blades ◽  
Forced Vibrations ◽  
Forced Response ◽  
The Self ◽  
Response Analysis ◽  
Computationally Efficient ◽  
Bladed Disk ◽  
Steam Turbine Blades ◽  
Number Of Publications

It is well known that the vibrational behavior of a mistuned bladed disk differs strongly from that of a tuned bladed disk. A large number of publications dealing with the dynamics of mistuned bladed disks are available in the literature. The vibrational phenomena analyzed in these publications are either forced vibrations or self-excited flutter vibrations. Nearly, all published literature on the forced vibrations of mistuned blades disks considers harmonic, i.e., steady-state, vibrations, whereas the self-excited flutter vibrations are analyzed by the evaluation of the margin against instabilities by means of a modal, or rather than eigenvalue, analysis. The transient forced response of mistuned bladed disk is not analyzed in detail so far. In this paper, a computationally efficient mechanical model of a mistuned bladed disk to compute the transient forced response is presented. This model is based on the well-known fundamental model of mistuning (FMM). With this model, the statistics of the transient forced response of a mistuned bladed disk is analyzed and compared to the results of harmonic forced response analysis.

Tissue characterization with ballistic photons: counting scattering and/or absorption centres

2015 ◽  
Vol 23 (1) ◽  
Author(s):  
F. Corral ◽  
M. Strojnik ◽  
G. Paez
Keyword(s):  
Piezoelectric Actuator ◽  
Tissue Characterization ◽  
Total Concentration ◽  
Phase Delay ◽  
New Method ◽  
Experimental Setup ◽  
Transmission Attenuation ◽  
Pass Through ◽  
Integrated Or ◽  
Ballistic Photons

AbstractWe describe a new method to separate ballistic from the scattered photons for optical tissue characterization. It is based on the hypothesis that the scattered photons acquire a phase delay. The photons passing through the sample without scattering or absorption preserve their coherence so they may participate in interference. We implement a Mach−Zehnder experimental setup where the ballistic photons pass through the sample with the delay caused uniquely by the sample indices of refraction. We incorporate a movable mirror on the piezoelectric actuator in the sample arm to detect the amplitude of the modulation term. We present the theory that predicts the path−integrated (or total) concentration of the scattering and absorption centres. The proposed technique may characterize samples with transmission attenuation of ballistic photons by a factor of 10

Mechanical Model and Movement Analysis of Self-Adjusting Bolt in Converter

2014 ◽  
Vol 488-489 ◽  
pp. 1070-1073
Author(s):  
Qiang Yin ◽  
Gong Fa Li
Keyword(s):  
Stress Analysis ◽  
Dynamic Load ◽  
Mechanical Model ◽  
Movement Analysis ◽  
Mechanical Analysis ◽  
Model Analysis ◽  
The Self ◽  
Maximum Torque ◽  
Movement Model ◽  
Bolt Support

The movement model of self-adjusting bolt is built in this paper, then the kinematical and mechanical analysis is taken to determine the movement of bolt under the converters working condition.Via the mechanical model analysis of self-adjusting bolts, the load applied to the self-adjusting bolt support including the static weight load of converter and steel liquid, the tilting torque, the dynamic load produced by frequent startup, brake, impact, and the boiling of steel liquid is calculated to determine the distribution of load forcing on the three groups of the self-adjusting bolt. According to the results of stress analysis, the bolt facing tapping hole is the most dangerous when converter tilts 63°. The maximum torque is 281.5101tm.

Criterion for Preventing Self-Loosening of Preloaded Cap Screws Under Transverse Cyclic Excitation

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Xianjie Yang ◽  
Sayed A. Nassar ◽  
Zhijun Wu
Keyword(s):  
Closed Form ◽  
Test Procedure ◽  
Closed Form Solution ◽  
Form Solution ◽  
The Self ◽  
Experimental Setup ◽  
Transverse Loading ◽  
System Parameters ◽  
Transverse Excitation ◽  
Key Variables

In this paper, a novel criterion is developed for preventing the self-loosening of preloaded threaded cap screws under cyclic transverse loading. For a known cyclic excitation, the system parameters are used in the formulation of a closed form solution for the minimum fastener preload required for preventing self-loosening. The effect of several key variables is investigated; this includes bearing and thread friction coefficients, cap screw grip length, thread pitch, material, and cyclic amplitude of the transverse excitation. An experimental setup and test procedure are established. Comparison between the experimental and analytical clamp load variation results shows that the proposed criterion can accurately predict the requirements for preventing self-loosening.

Simulation of Suspension-Tire System Model Based on Rear Axle of Twist Beam

2010 ◽  
Vol 34-35 ◽  
pp. 1906-1910
Author(s):  
Xu Dong Wu ◽  
Shu Gang Zuo ◽  
Lei Lei ◽  
Zian Wu Yang ◽  
Yong Li
Keyword(s):  
Friction Coefficient ◽  
Mechanical Model ◽  
Rear Axle ◽  
The Self ◽  
System Model ◽  
Model Based ◽  
Excited Vibration ◽  
Exciting Source ◽  
Polygonal Wear ◽  
Lateral Friction

With the intention of researching suspension’s effect on the self-excited vibration of tire, according to the characters of polygonal wear, the twist beam suspension of car PassatB5 was simplified to proper mechanical model in the method of FEA. Then, making the coupling of lateral friction self-excited vibration of tire and draw-wrest operation of lengthways pendulum arm taking the previously built friction coefficient model into account which could cause the self-excited vibration of tire, besides the velocity of car’s driving, another exciting source could be found in this model.

scholarly journals Pecunia non olet: on the self-selection into (dis)honest earning opportunities

2021 ◽  
Author(s):  
Kai A. Konrad ◽  
Tim Lohse ◽  
Sven A. Simon
Keyword(s):  
Willingness To Pay ◽  
Laboratory Experiment ◽  
The Self ◽  
Decisive Factor ◽  
Experimental Setup ◽  
Self Selection

AbstractWe study self-selection into earning money in an honest or dishonest fashion based on individuals’ attitudes toward truthful reporting. We propose a decision-theoretic framework where individuals’ willingness to pay for honest earnings is determined by their (behavioral) lying costs. Our laboratory experiment identifies lying costs as the decisive factor causing self-selection into honest earning opportunities for individuals with high costs and into cheating opportunities for those prepared to misreport. Our experimental setup allows us to recover individual lying costs and their distribution in the population.

scholarly journals Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal

2021 ◽  
Vol 11 (11) ◽  
pp. 5285
Author(s):  
Marcel G. Clerc ◽  
Gregorio González-Cortés ◽  
Paulina I. Hidalgo ◽  
Lucciano A. Letelier ◽  
Mauricio J. Morel ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Phase Modulation ◽  
Order Parameter ◽  
Liquid Crystal Cell ◽  
The Self ◽  
Self Organization ◽  
Experimental Setup ◽  
Coherent Beams ◽  
Light Beams

The use of dye-doped liquid crystals allows the amplification of the coupling of light and liquid crystals. Light can induce the self-organization of the molecular order. The appearance of ring patterns has been observed, which has been associated with phase modulation. However, the morphology and dynamics of the ring patterns are not consistent with self-modulation. Based on an experimental setup with two parallel coherence beams orthogonal to a liquid crystal cell, one of which induces photo-isomerization and the other causes illumination, the formation of ring patterns is studied. To use these two coherent beams, we synthesize methylred methyl ester as a dye-dopant, which is photosensitive only to one of the light beams, and a commercial E7 liquid crystal as a matrix. Based on a mathematical model that accounts for the coupling between the concentration of the cis-state and the order parameter, we elucidate the emergence of the rings as forming patterns in an inhomogeneous medium. The bifurcation diagram is analytically characterized. The emergence, propagation of the rings, and the establishment of the ring patterns are in fair agreement with the experimental observations.

The Mechanical Model of the Self-Guided Single-Blade Deep-Hole Reamer

2012 ◽  
Vol 452-453 ◽  
pp. 597-601
Author(s):  
Xiao Bin Huang ◽  
Xing Quan Shen
Keyword(s):  
Structural Design ◽  
Mechanical Model ◽  
The Self ◽  
Cutting Conditions ◽  
Deep Hole

The structure and force of the reamers were analysed, and the mechanical model of the self-guided Single-blade deep-hole reamer was established. The fundamental basis of the structural design was expounded in theory. And analysed the Rationality which Single-blade tool and two Guide block were used. And the reamer stable cutting conditions were obtained.

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