A5034308462- Nonlinear Dynamics and Pattern Formation
- Tribology and Lubrication Engineering
- Gear and Bearing Dynamics Analysis
- stochastic dynamics and bifurcation
- Iterative Learning Control Systems
- Engineering Education and Curriculum Development
- Numerical methods in engineering
- Fractional Differential Equations Solutions
- Experimental Learning in Engineering
- Mathematical and Theoretical Epidemiology and Ecology Models
- Computational Fluid Dynamics and Aerodynamics
- Advanced Numerical Methods in Computational Mathematics
- Educational Technology and Assessment
- Privacy-Preserving Technologies in Data
- Mobile Ad Hoc Networks
- Brain Tumor Detection and Classification
- Opportunistic and Delay-Tolerant Networks
- Adhesion, Friction, and Surface Interactions
- Bladed Disk Vibration Dynamics
- MXene and MAX Phase Materials
- Numerical methods in inverse problems
- Advanced Graph Neural Networks
- Intermetallics and Advanced Alloy Properties
- Complex Network Analysis Techniques
- Boron and Carbon Nanomaterials Research
Beijing Jiaotong University
2020-2024
Shijiazhuang Tiedao University
2016-2017
University of Shanghai for Science and Technology
1999
Shanghai University
1999
Compared to traditional superhard materials with high electron density and strong covalent bonds, alloy mainly composed of metallic bonding structures typically have great toughness lower hardness. Breaking through the limits is a preface long term topic, which significance value for improving comprehensive mechanical properties materials. Here, we report on discovery cubic semiconducting material Ti2Co large Vickers hardness Hvexp = 6.7 GPa low fracture KICexp =1.51 MPa m0.5. Unexpectedly,...
Abstract An improved variable cross‐section cantilever beam model for evaluating the time‐varying mesh stiffness (TVMS) of perfect gear tooth is developed in which number driving less than 42 and that driven more 42. The TVMS obtained by proposed method compared with result without considering misalignment between base circle root. Four types root crack models changes 13‐crack levels are presented. fault vibration characteristic a single‐stage spur reducer analyzed correctness qualitatively...
The existence of pitting failure has a direct influence on the time-varying mesh stiffness (TVMS) and thus changes vibration properties gears. shape tooth surface is characterized by randomness geometric complexity. overlapping rarely been investigated, especially when misalignment gear base circle root was considered. In this paper, considered as approximately union several ellipse cylinders, in which treated cantilever beam starting from circle. Then, TVMS perfect that with different...
The integer-order and fractional-order Brusselators with two different time scales are studied. double-Hopf bursting oscillation is observed in Brusselator periodic perturbation under some parameter conditions. Based on slow-fast analysis bifurcation theory, the generation mechanism of presented detail. Further investigation finds that amplitude plays an important role oscillation. With decrease amplitude, attractor types will be changed, so bi-stability evolves into single stability. It...
This paper proposes a new teaching and learning approach-project module based (PMBTL). The PMBTL approach incorporates the merits of project/problem methods, overcomes limitations these methods. correlation between teaching, learning, practice assessment is emphasized in this approach, methods have been proposed accordingly. distinct features differentiate from conventional approaches. Evaluation on practical activities demonstrates effectiveness stability improving performance quality...
Abstract The Brusselator with different time scales, which behaves in the classical slow-fast effect, is investigated, and characterized by coupling of quiescent spiking states. In order to reveal generation mechanism using analysis method, coordinate transformation introduced into Brusselator, so that transformed system can be divided fast slow subsystems. Furthermore, stability condition bifurcation phenomenon subsystem are analyzed, attraction domains equilibria presented theoretical...
The fractional-order Belousov-Zhabotinsky (BZ) reaction with different time scales is investigated in this paper. Based on the stability theory of differential equation, critical condition Hopf bifurcation two parameters BZ discussed. By comparison and integer-order systems, it found that they will behave stabilities under some parameter intervals, intervals may become larger variation fractional order. Furthermore, slow-fast effect firstly studied coupled, Fold/Fold type oscillation jumping...
In this paper, nonlinear dynamic model of spur gear pairs with fractional-order damping under the condition time-varying stiffness, backlash and static transmission error is established. The general formula term derived by using incremental harmonic balance method (IHBM), approximate analytical solution system obtained use iterative formula. correctness results verified comparing numerical solutions in existing literature. effects mesh internal excitation amplitude fractional order on...
Abstract The nonlinear frequency response characteristics of a spur gear pair with fractional-order derivative under combined internal and external excitations are investigated based on the incremental harmonic balance (IHB) method. First, pure torsional vibration model is proposed that contains various complex factors, such as time-varying mesh stiffness, transmission error, fluctuation input torque, backlash. Then, IHB method developed to calculate higher-order approximate solution system,...
目的应用UHPLC/Q-TOF/MS技术和血清药物化学研究手段，分析检测羊耳菊有效组分的入血成分。 方法大鼠灌胃给予羊耳菊有效组分提取物后，腹主动脉抗凝采血，血浆经甲醇二次沉淀蛋白处理。采用Eclipse Plus C18 RRHD色谱柱（2.1 mm×100 mm，1.8μm），0.1%甲酸水（A）-0.1%甲酸乙腈（B）做流动相梯度洗脱，流速0.3 mL·min-1。负离子检测模式，同时结合布鲁克道尔顿公司的Metabolite Tools软件，鉴定和表征其血中的移行成分。 结果给药后，在大鼠血浆中共检测到16个代谢产物，包括9个原型成分和7个代谢物，代谢方式主要以咖啡酰基奎宁酸类化合物的异构化、甲基化及甲基葡萄糖醛酸化的复合反应为主。 结论本研究较为全面地阐释了羊耳菊活性部位提取物在大鼠血中的入血成分，为进一步研究羊耳菊药材的体内过程和药效物质基础提供了一定的参考。
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The mesh stiffness and vibration characteristics of a spur gear system are investigated when the crack propagates beyond central line tooth. time-varying (TVMS) in single-tooth engagement region double-tooth for with tooth is obtained based on potential energy principle. A 4 DOF considering backlash clearance supporting radial direction established, effect different sizes response studied.