Yang Zhao's research while affiliated with Chongqing University of Posts and Telecommunications and other places

Publications (31)

Article
Overhead transmission lines may be destroy by strong wind, the collapse of it may bring about serious consequences. Therefore, understanding the dynamic response changing laws of the tower with various wind conditions is necessary in design stage. This paper introduced a prediction method of dynamic behaviors of tower based on support vector regres...
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Optimizing machining parameters and pass numbers under machining stability constraint is important for manufacture engineers planning a multi-pass milling operation. Considering that milling stability varies with the machine tool dynamics when the tool and workpiece position changes, a generalized regression neural network (GRNN) is adopted to obta...
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This paper proposes two numerical and one analytical yarn pull-out models to investigate pull-out behavior and its energy transfer mechanism. First, the microgeometry of a two-dimensional woven fabric is generated with 112 fibers per yarn mesh implementing the digital element approach. In this approach, one yarn consists of a bundle of fibers and o...
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Chatter occurring in the milling process can seriously deteriorate the machining efficiency and surface quality. The stability diagram predicted using the tool tip frequency response functions (FRFs) is an effective approach to avoid the chatter vibration. The tool tip FRFs highly depend on the characteristics of the tool-holder-spindle-machine too...
Article
The transmission tower is important structure equipment in the power system. The bolts which connect the angle steel together may loose under the cycle loading. As a further effect, the dynamic behaviors of the tower may change and lead to failure. In this paper, the finite element model of a typical 500 kV transmission tower which considers the co...
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The natural frequencies corresponding to the particular mode shapes of a large turbo-generator must not be in the resonance region before delivery. Different parameters may clearly affect these dynamic characteristics. Different from other studies, this paper introduces a method for obtaining the inherent characteristics of end winding in a short p...
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A new two-dimensional finite element model of a lubricated contact pair, based on a contour integral, is proposed to investigate the formation of micro-pitting on gear tooth surfaces. Meanwhile, the contact properties and elasto-hydrodynamic lubrication (EHL) conditions of the gears are considered in the lubricated contact pair model. Then, the str...
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To date, research on the physical and mechanical behavior of nickel-titanium shape-memory alloy (NiTi SMA) has focused on the macroscopic physical properties, equation of state, strength constitution, phase transition induced by temperature and stress under static load, etc. The behavior of a NiTi SMA under high-strain-rate impact and the influence...
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This paper presents an analysis of free vibration characteristics of truncated conical shells under complex boundary conditions. Firstly, the geometric equation of conical shells are obtained by using Reissner shell theory. Then, by using Rayleigh- Ritz method with improved Fourier series, the motion equations of modal parameters (modal stiffness,...
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When errors occur in the sensor networks, there are noise in the acquired data. In this paper, based on the response correlation function between two points of the structure, the least squares complex exponential method is used to identify the influence of noise on the structural modal parameters. Through the construction of the steel beam platform...
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Operational Modal Analysis (OMA) makes up for the shortcomings of the traditional experimental modal analysis based on known excitation-response and only needs to identify the structure’s modal parameters based on the vibration response signal of the structure. The OMA method is mostly based on white noise or random excitation. However, for rotatin...
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Neuroinflammation is considered as one of the crucial pathogenesis in promoting neurodegenerative progress of Alzheimer’s disease (AD). As complementary and alternative therapy, electroacupuncture (EA) stimulation has been widely used in clinical practice for anti-inflammation. However, whether EA promotes the cognitive deficits resulting from neur...
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In order to study the influence of different direction loads on the strength of a 5 megawatt large-scale wind turbine hub, a three-dimensional finite element model of the wind turbine is established in this paper. Based on the wind turbine design software GH Bladed, the ultimate working load is extracted, and the numerical analysis method is used t...
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The main shaft of the wind turbine is an important supporting component of the wind turbine and its performance directly affects the safety of turbine. The structural strength of the main shaft under the 7 ultimate load conditions is checked according to the working load data. The results show that the maximum working stress 182 MPa occurred in Mx...
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3-D woven textile is generated through the weaving process. Yarn is a non-continuum material domain, the structure of which is determined by inter fiber movement. In this study, the micro-geometry of 3-D orthogonal weave is generated at filament level predicting through the weaving process implementing the digital element approach (DEA). First, the...
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The assembling process of Ni47Ti44Nb9 alloy pipe joints considering the phase transformation and plasticity was numerically simulated for the first time with a developed constitutive model. The simulated process was based on the experimental material parameters, which were determined with the experimental tensile results of Ni47Ti44Nb9 shape memory...
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The temperature and flow rate of coolant have a great influence on the performance of the cooling system. Too low temperature of coolant will increase the temperature difference between single batteries, and too high temperature will not be conducive to battery cooling. If the flow rate of coolant is too high, it will lead to the increase of system...
Article
In this study, the tension-compression asymmetry of single-crystalline and nanocrystalline NiTi shape memory alloys (SMAs) was investigated by molecular dynamics (MD) simulations. Compound twinning martensite variants were simulated via thermally-induced martensitic transformation. The characteristics of the forward and reverse martensitic transfor...
Article
A chronic neuroinflammatory response has been considered as a critical pathogenesis promoting neurodegenerative progression in Alzheimer's disease (AD). During neuroinflammatory process, microglia are excessively activated and simultaneously release numerous pro-inflammatory mediators that cause synaptic dysfunction in the forebrain prior to neuron...
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In this study, the whole assembly process from pre-treatment to service of NiTiNb shape memory alloy (SMA) pipe-joint system is numerically simulated by using of the finite element method. With the change of the wall thickness of SMA joints and the pipe outer diameter, the contact pressure and pull-out force under different interferences and pipe d...
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The electromagnetic fields of a 600MW turbogenerator stator end region under three-phase short circuit and two-phase short circuit are calculated by numerical simulation base on a three-dimensional electromagnetic model. The variation of electromagnetic force density can also be obtained in the same time. Then the dynamic responses consist of defor...
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Since microglia possess both neuroprotective and neurotoxic potential, they play a crucial role in the central nervous system (CNS). Excessive microglial activation induces inflammation-mediated neuronal damage and degeneration. At present, numerous herbal compounds are able to suppress neurotoxicity via inhibiting microglial activation. Therefore,...
Article
Molecular dynamics (MD) simulations Ni-Ti based on a second nearest neighbor modified embedded-atom method potential were performed to study atomic-scale mechanical behavior and microstructural evolution of Ni-Ti alloy at different temperatures. By using four calculated characteristic transformation temperatures, the optimum simulated temperature r...
Article
Micro-indentation has been widely used for testing the mechanical properties of NiTi SMAs. In the present study, large-scale molecular dynamics (MD) simulations of nano-indentation on equiatomic NiTi SMA were performed with a 2NN MEAM potential. The temperature- and stress-induced martensitic transformation was simulated, where the phase transforma...
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Background Microglial activation contributes to neuroinflammation and neuronal damage in neurodegenerative disorders including Alzheimer's and Parkinson's diseases. It has been suggested that neurodegenerative disorders may be improved if neuroinflammation can be controlled. trans-cinnamaldehyde (TCA) isolated from the stem bark of Cinnamomum cassi...
Article
Machine tool's milling stability is a function of the frequency response function (FRF) at the tool tip, which varies with the position changes of the moving components within the machine tool work volume. The approach to obtain stability lobe diagram avoiding chatter vibrations is generally based on some specific positions, resulting in an incompr...
Article
A three-dimensional (3-D) electromagnetic model of the end region of a 600 MW turbogenerator is set up. The variations of electromagnetic force densities of the stator end winding under rated load and three-phase short circuit from full load are obtained by numerical simulation. Then, the electromagnetic forces varying with time and space on the en...
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Full-text available
The material properties, including Young's modulus, Poisson's ratio, and density, of the structural components in the stator end winding of a typical 600-MW turbogenerator were experimentally measured; the equivalent bending stiffness of the conductor bars are determined by the three-point bending test, and the lower orders of natural frequencies a...

Citations

... Due to the presence of the amorphous phase, increases in the stability of the martensite phase cause a sudden decrease in the stress plateau and hysteresis under cyclic loading. In addition, Wu et al. [26] studied the existence of pores in porous NiTi alloys under impact, leading to martensite transformation as well as plastic deformation caused by the transformation. ...
... Our results also revealed that advanced technical means have been widely used to evaluate and investigate the mechanisms of acupuncture for AD treatment in recent years, especially functional brain imaging techniques, like positron emission tomography (PET), dynamic contrastenhanced MRI (DCE-MRI), arterial spin labeling-fMRI (ASL-fMRI), magnetic resonance spectroscopy (MRS) [19][20][21] and electrophysiology [22]. ese types of imagingbased research will provide novel opportunities to explore the underlying mechanisms of acupuncture in AD in a dynamic, visual, and objective manner [23]. ...
... The fiber bending stiffness and shear force between rod elements is determined by the fiber moment of inertia, longitudinal modulus, and the fiber curvature. 28 As such, the mechanical properties of the actual fiber are fully taken into consideration when generating the fabric geometric model. The length of the rod elements, which is a predominant factor in determining the computational cost, is affected by the fiber-to-fiber contact method. ...
... In the last years, SMA rings found noticeable interest for small scale interference couplings [8] and large-scale civil applications, in particular for seismic bracing [9] and damping devices [10][11][12][13]. Studies are being carried out to better investigate their thermomechanical behaviour by numerical [14][15][16][17] and experimental [18,19] analyses in order to extend their use in other engineering fields and to develop ad-hoc design/validation methods needed for specific applications. ...
... The s NiTi alloys is relevant for the manufacture of biomaterials for bone-rep due to their properties, including low density, tissue in-growth abilit fixation to the implants), and SME and SE [3,15,16]. It is complicate mechanical behavior of NiTi shape memory alloys (SMAs) due to transformation behavior [19,20]. Usually, the SME and SE are evaluate tests, for example, the uniaxial tensile, point bending, and compres However, asymmetric behavior is influenced by the grain size (nanosca macroscale) and the nature of the stress-strain applied [19,20]. ...
... Most probably, GPR55 also participates in hippocampal plasticity and may play an important role in the modulation of memory and learning (Hurst et al. 2017). Increasing evidence indicates that neuroinflammation may play a crucial role in the development of memory deficits (Wu et al. 2017;Zhao et al. 2019). It has been reported that the ROS system is associated with the pathology that results from neuroinflammation (Khan et al. 2016). ...
... Excessive production of these inflammatory mediators could cause neuronal damage and death. Accumulated evidence suggests that suppressing microglial activation and neuroinflammation could attenuate the severity of neurodegenerative disorders [103][104][105]. ...
... The modern PTMC relies on the free rotations , , etc., but these additional rotations depend on the pairs or quadruplets of variants that are considered, which renders irrelevant the notion of austenite-martensite OR that was however judged to be of prime importance in the earlier versions of PTMC. The PTMC also remains mute on atomic displacements, which has forced some researchers to develop alternative approaches based on molecular dynamics to get a better understanding of the rearrangement of the atoms during the austenitemartensite transformation [53,54]. ...
... A modified Tersoff potential with a cutoff distance extended to 2.45 Å has been proven to represent the binding energy for diamond structures well [27], and it is adopted to mimic the atomic force within the diamond projectile. As the diamond projectile approaches MXene nanosheets, the 'weak' van der Walls force/interactions between the two structures are described by a Morse potential, which has been successfully used for diamond-involved contact simulation such as indentation [28,29], collision [30] and machining [31]. The general form of Morse potential is expressed as: ...
... The change in the phenotype of microglial cells from a "resting" state to M1 is typically induced by treatment with interferon-γ (IFN-γ) or lipopolysaccharide (LPS) (Colonna and Butovsky 2017). Activated microglial cells are also linked to the expression of several pro-inflammatory factors including nitric oxide (NO), inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2), and nuclear factor-kappa B (NFκB) (Fu et al. 2017). In addition, several studies have indicated that NFκB, protein kinase B (Akt), and compounds in the mitogen-activated protein kinase (MAPK) signaling pathway such as p38 and extracellular signal-regulated kinase (ERK) are involved in the process of inflammation that accompanies microglial activation (Chu et al. 2021;Qin et al. 2018;You et al. 2018). ...