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Mechanical properties of two contrasting rice cultivars, P64S/E32 and SY63, were measured using 3-point bending tests performed on segments taken at the base and top of plant stems. The parameters of an elastic-plastic material constitutive law were fitted using a finite beam element model reproducing the 3-point bending tests. Both measured data and constitutive laws were compared between cultivars...
Mechanical properties of biological cells play an important role in regulating cellular functions. Some micromanipulation methods have been reported in the literature to measure cell mechanics, but they are either high-costly or difficultly-operated. This paper presents our approach to use microrobotic cell injection technology as the test bed to characterize the mechanical properties of biological...
This paper presents the influence of flatness of the secondary reaction plate on performance of a linear induction motor. Construction tolerance of the plate affects directly to the cost and performance of the Linear metro. Detailed simulation of the flatness has been done by using FEM.
In this paper, the models of the base of a type vertical motor were adopted to MSC. NASTRAN software to analysis modes and transient response, get transient response, natural frequencies and vibration shape based on element finite simulation, and the mechanics capability was proved, these main destroy forms and locations were gained. The effect of the vibration of the motor was also discussed according...
Galloping of an iced transmission line is characterized by high amplitude, low frequency, self-excited vibration produced by a steady side wind. It is a dangerous phenomenon that seriously threatens the security of power systems. In this paper, the finite element method is utilized and one kind of point element having concentrated mass is used to simulate the inertia and eccentricity of the ice which...
Gas Foil Bearings (GFBs) are a proven alternative to rolling element bearings for high speed applications. In order to supplies much higher damping and much bigger load capacity, the Large assembly preload is often added in GFBs now, especially in the multi-leaf foil bearings. According to the structure characteristics of the multi-leaf foil journal bearing with large assembly preload, the nonlinear...
A micromechanical silicon resonant accelerometer (SRA) with micro leverage mechanism amplifying the inertial force is presented. SRA consists of a pair of double-ended tuning forks (DETF), a proof mass and a micro lever mechanism. Firstly, the relation between frequency shift and applied force of DETF is modeled with the classical Bernoulli-Euler beams theory and then simulated by the finite element...
Explore the analysis of the three dimensioned finite element and the dynamical time-domain analysis for actural earth layerpsilas earthquake reflection after the site condition has been changed ,and to discuss the ANSYS analysis of the predominant period varication under the site vibration by enlarging the acceleration effect of the ground rock summit.
In this paper, pile-anchor support system of foundation pit is analyzed by ANSYS, which is the large scale general finite element analysis software. The stress and displacement of foundation pit and support system are available from ANSYS. On the basis of the finite element analysis results, traditional method is adopted to design and calculate the support system. Comparing the two results, the suitability...
Electrical linear motors are electromechanical devices that produce short unidirectional or bidirectional strokes. The purpose of this work is to model a tubular linear motor (TLM) using 2D and 3D finite element (FE) method and analytical equations. The 2D and 3D FE magnetodynamic analyses are performed using a magnetic vector potential formulation. The linear displacement is modeled by means of a...
The fault analysis for the electrostatic parallel-plate is a critical issue in the design flow, as it played an important role in determining device reliability and the voltage required for successful operation. The simulations for pull-in and release voltages were carried in CoventorWare. The FEM model was constructed. The displacement of the upper electrode and corresponding capacitance between...
Analytical models have been developed for analysing the radial vibration force in fractional-slot permanent magnet machines and validated extensively by finite element analyses. They are used to investigate the influence of (a) stator slotting, (b) tangential field component, (c) radius in the airgap for computation, and (d) load condition etc. on the radial vibration force calculation. The major...
Today, children and adolescents are participating heavily in organized athletics year-round. Each year, approximately one third of these children will experience a serious injury requiring a doctor's or hospital visit. Physeal, or growth plate fractures, are one such type of overuse injury commonly seen in adolescents. At the knee joint, injuries in adolescents occur most often in the proximal region...
This paper investigates the dynamic response of steam generator foundation by finite element analysis. To verify the feasibility and effectiveness of the method, a series of parameters of the finite element model were studied. The parameters consist of material character, mesh size, element type, meshing method, boundary treatment, equipment weight, excitation, post treatment and so on. By comparing...
Researches on micro-manipulation have predominantly received great attention by microsystem researchers with the rapid evolvement of (Micro Electro Mechanical Systems) MEMS technology and ever increasing demands in miniaturization of systems to be implemented in vast applications. On the aspect of dexterous manipulation of micro-parts, a robust microgripper encapsulating high precision and fidelity...
We propose a new structure for a permanent-magnet-biased axial hybrid magnetic bearing. Starting with the inner air gap and the outer air gap of conventional axial magnetic bearings, we first construct a novel air gap between the permanent magnet and the outer housing, which we call the second air gap, separating the bias flux paths from the control flux paths. As a result, the control flux paths...
A novel kind of MEMS micro-gyroscope, piezoelectric micromachined modal gyroscope (PMMG), is introduced in the paper. PMMG works with the special vibratory mode of solid material, and it is a kind of solid-state micro-gyroscope, which is different from micromachined vibratory gyroscope. There is no moving part and suspended structure in PMMG, and it is robust for the higher resistance to shock and...
In the paper, the characteristics of mode and harmonic response of the axis of the high-speed motorized spindle are presented with the FEM (Finite Element Method). A dual-dimension model with the FEM is developed and simulated using ANSYS commercial software. The result shows that the rated rotating speed of the high-speed motorized spindle is far smaller than the first-order natural resonance speed,...
The paper reports a systematic study of the resonance-mode effect on mass-sensing performance of resonant microcantilevers by both analytic and experimental methods. Firstly the research reveals that the in-air mass-sensing resolution of resonant microcantilevers is dominated by air-drag loss limited Q-factor. Using theoretic analysis and software simulation, we conclude that a higher order mode is...
The mechanical characterization of cells is important in understanding cellular behavior. A micro-robotic system such as atomic force microscopy (AFM) can be adapted to measure the mechanical behaviors of cells due to its high spatial resolution and high sensitivity. AFM probing experiments on cells were performed with conical tips and sphere-particle-attached tips; the results were analyzed to characterize...
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