Forced and free vibrational analysis of viscoelastic nanotubes conveying fluid subjected to moving load in hygro-thermo-magnetic environments with surface effects

Thermoelastic vibrations in electro-mechanical resonators based on rotating microbeams exposed to laser heat under generalized thermoelasticity with three relaxation times

The flutter characteristics of a truncated conical shell with variable thickness exposed to a supersonic fluid flow are studied in this study. The first-order shear deformation theory (FSDT) is employed to model the shell and the linear piston theory is utilized to evaluate the aerodynamic pressure. The boundary conditions and governing equations are formulated based on Hamilton’s principle. An exact solution is presented in the circumferential direction and the differential quadrature method (DQM) is hired to present an approximate solution in the meridional direction. A general two-parameter power-law equation is considered for thickness variation in the meridional direction and the effects of these coefficients on the flutter boundaries are examined. It is observed that utilizing the conical shells with uniform thickness is not an optimum design and to improve the aeroelastic stability of the conical shells it is better to increase the thickness of the shell from the small radius of the shell to the large one. As the novelty of the presented work, it can be claimed that it is the first attempt to examine the flutter characteristics of conical shells of nonuniform thickness and the results can be utilized to provide optimum designs for aerovehicles. 

Effect of variable thickness on the aeroelastic stability boundaries of truncated conical shells

Simulation Analysis of Dynamic Load of Synchronous Belt Drive based on MFBD

A literary review related to micro/miniature heat pipes is presented ever since the introduction of the concept of micro heat pipe. Both the theoretical and experimental research of micro/miniature heat pipes, including single micro heat pipe, heat pipe array and flat miniature heat pipes, are reviewed respectively. The heat transfer limitations of micro/miniature heat pipes are also surveyed at the same time. In the end, the consistently recognized research conclusions and the difficulties and challenges in the micro/miniature heat pipes research are summarized. It is proved that the micro/miniature heat pipes are promising for the use of small - room heat dissipation such as the cooling of micro electronic apparatus.

Status and Recent Progress of Research on Micro/Miniature Heat Pipes

Analytical and parametric analysis of thermoelastic damping in circular cylindrical nanoshells by capturing small-scale effect on both structure and heat conduction

In order to study the dynamic performance of dual overhead synchronous belt transmission system, the load distribution model of the transmission system was established by Recurdyn, the multibody dynamics software, and the kinematics and dynamics simulation of the transmission system was carried out. At the same time, the simulation results are analyzed, and three important initial conditions are analyzed: system load, initial tension of synchronous belt, rotation speed of crankshaft pulley, which affect the load distribution of synchronous belt transmission system, and the load distribution rule under each initial condition is obtained.

Dynamic performance simulation research of dual overhead synchronous belt drive system

According to the characteristics of ploughing extrusion forming and the theory of metal cutting, the wear and damage mechanism, common wear and damage forms and causes of multi-tooth tools in ploughing extrusion forming are analyzed. Then, the correctness of the analysis of tool wear and damage mechanism and common wear and damage forms is verified by field cutting experiments. At the same time, the phenomena and causes of workpiece stagnation and cracks in the process of ploughing and extrusion forming were obtained through experiments. Finally, the reasonable processing parameters of ploughing and extrusion forming multi-tooth cutting tool were obtained.

Experimental research of ploughing extrusion forming multi-tooth tool wear and damage mechanism and workpiece defects

Research on vibration compensation mechanism of engine ellipse timing system and belt tension distribution at meshing points

In order to research the ploughing extrusion angle influence on cutting performance and realize the virtual design and manufacture of ploughing-extrusion forming cutter, the plough-extrusion forming process of wick micro-groove structure was simulated by DEFORM-3D software. The micro-copper tube with diameter of 6 mm was simplified to 0.4 mm thick copper plate in this paper. In the simulation process, only the single parameter of tool extrusion angle was changed (45°, 60°, and 90°). The structure, stress and strain distributions of copper plate fins formed by three kinds of extrusion angle cutters were analyzed. It is concluded that the plough-extrusion cutting performance of 60 degree extrusion angle cutter is the best.

Fan Rui

Papers

Analytical and parametric analysis of thermoelastic damping in circular cylindrical nanoshells by capturing small-scale effect on both structure and heat conduction

Dynamic performance simulation research of dual overhead synchronous belt drive system

Experimental research of ploughing extrusion forming multi-tooth tool wear and damage mechanism and workpiece defects

Research on vibration compensation mechanism of engine ellipse timing system and belt tension distribution at meshing points

Simulation Research on Ploughing Extrusion Angle Influence on Machinability