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Lekhniskii theory is extended to the researches on one-dimensional piezoelectric quasicrystals. Considering the quasicrystals with a single crack subjected to uniform loads at infinity, the field intensity factors and strain energy release rate are obtained. The weight function is derived when the point forces are applied near the crack tip. The field intensity factors of piezoelectric quasicrystals...
By using the general solutions of one-dimensional quasicrystals with piezoelectric effect and introducing four potential functions, the plane problem of orthorhombic piezoelectric QCs subjected to the point forces and point charge is taken into account. The fundamental solutions in a closed form are obtained and the numerical results are given. The mechanical behaviors of 1D piezoelectric QC with...
Recent gradual improvement of the distributed electric resources (DER) penetration results in the change of original topology and power flow direction of distributed network. The short circuit current, which is provided by distributed electric resources, has changed the distributed network fault current both in size and distribution, will reduce the protection sensitivity, and bring negative impacts...
Vertical axis water turbine (hereafter VAWT) is the common investigated equipment in tidal streams turbine generator system. In this paper, the flow fields around a VAWT were numerical simulated with emphasis on the hydrodynamic performance of VAWT. The simulations were undertaken with the Computational Fluid Dynamics (CFD) software FLUENT 6.2 using the sliding meshes controlled by user-defined functions...
This paper provides a detailed discussion on the simulation of a landing gear retraction /extension(R/E) system. Section 2 of the full paper presents a general description of the R/E system and its retraction procedure. A mathematical model of the R/E system is introduced by Section 3, which gives a basic idea for numerically modeling this mechanism. Section 4 brings up the procedures for constructing...
This paper presents a novel two level current optimization algorithm for the control of the spherical motor. The proposed spherical motor consists of a rotor with 8 cylindrical permanent magnet (PM) poles and a stator with 24 air-core coils. An analytical expression of the torque model is obtained based on finite-element method. Based on this expression, the relationship between the motor torque and...
Making changes of cells function by regulating the external mechanical environment is one of the major interests in the mechanobiology field. Based on extensive studies, force at nano-to-micro newton and geometric shape changes at nano-to-micrometer are the physical stimuli that can be sensed by cells. It has been postulated that controllable cell responses can be produced by activating diversity...
Biological cells possess biochemical modules and physical shapes to maintain appropriate biological function. Different types of force and deformation are applied on cells to investigate the response and mechanical properties. In the biophysics field, studies use indentation deformation on cell membranes to examine the elastic-viscoelastic properties of biological cells. Experiments in different predefined...
In this paper, the author investigates root's soil mechanics' mechanism and influencing factors of a typical soil reinforcing plant- Hippophae rhamnoides Linn. in the area that has been destroyed by wind and water. This investigation has been done from two aspects: shear strength of root-soil composite and friction characteristic of root-soil interface. The results show that when the root diameter...
The railway enterprises in China have improved their capability of independent innovation and have effectively offered the precondition of the six speed-ups through the unique technology transition model. Based on the analysis of the internal, external and opportunity driving factor which motivating the realization of the railway enterprises technology transitions in China, a model used to measure...
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