Applied Mechanics and Materials Vol. 387

Abstract: A simplified smart flexible spatial piezoelectric beam with overall motions is studied in this paper. Considering the geometrically nonlinear effect resulting from curved and twisted deformations, and considering the kinetic energy of the piezoelectric actuator and the coupled terms of deformations in the longitudinal, lateral and transversal directions, and taking into account the coupling of electric performance of piezoelectric material and structure deformation, finally, the Rigid-flexible-electric coupling dynamic model of piezoelectric smart beam is established by infinite element method and Lagrange equation.

Abstract: The occurrence of agglomeration in gas-solid fluidized bed can have a very negative impact on the efficiency of reactor operation. In order to overcome the agglomeration problem, an Agglomeration Early-Warning System (AEWS) is proposed. AEWS is able to detect the event of such undesired behavior and make it possible to operate more efficiently. The sensitivity and selectivity of AEWS is illustrated with experimental results. In order to minimize the false alarm, both moving time window method and minimizing value method were analyzed. The experimental results have shown that agglomeration can be recognized 30-60min earlier with AEWS than that with conventional methods based on changes in pressure drop or temperature difference over the bed.

Abstract: We present the analyses of dynamics behaviors on a stroller wheel by three dimensional finite element method. The vibration of the wheel system causes by two different type barriers on the road as an experiment design to mimic the real road conditions. In addition to experiment analysis, we use two different packages to numerically simulate the wheel system dynamics activities. Some of the simulation results have good agreement with the experimental data in this research. Other interesting data will be measured and analyzed by us for future study and we will investigate them by using adaptive finite element method for increasing the precision of the computation results.

Abstract: The shear failure modes of anisotropic solids are studied here based on the elastic standard space of physical presentation, some new shear failure phenomena for anisotropic solids are presented. The relations between shear failure modes and anisotropy are discussed. The results show that there are obvious differences in shear failure modes for different anisotropic solids.

Abstract: Considering stress relaxation of rod under high temperature, pretightening force of rod changing with time was obtained. A finite element contact model with interface was analyzed and contact stiffness under different loads was concluded. Combining contact stiffness of the microscopic model with the stress analysis result of turbine interface, a calculating method for dynamic characteristic of combined rotor considering contact stiffness was presented, effect of rod relaxation on dynamic characteristic of combined rotor was obtained. The results showed that pretightening force of rod was decreasing due to stress relaxation, degradation of combined rotor that natural frequency drift caused by the stress relaxation of rod.

Abstract: In the paper,considered the contact effect between the disks interface,a number of dynamic model for torsional vibration for disc-type rod fastening rotor systems are established to find the rule of establishing them.And then a general dynamic model is put forward ,which can describe the torsional vibration for disc-type rod fastening rotor systems.The model which can be used generally simplifies the modeling process and get the torsional vibration characteristics quickly.Then we have calculated and tested torsional vibration characteristics of an experimental rod fastening rotor and compare the difference between theoretical calculation result and test result.The result shows that the dynamic model established by this paper is valid.

Abstract: The numerical simulation analysis on the whole process of the tube immersing is researched, which use computational fluid dynamics method, is based on RNG k~ε turbulence model. The analysis shows that: additional pressure of tube lateral wall depends on the changed flow field cause by tube immersing; through the analysis, it have explored the special position of additional pressure changes in the process of immersing; it also shows some problems should be paid attention, through analysis the stress of special position.

Abstract: A progressive damage model (PDM) composed by 3D FEM, Hashin and Ye failure criteria and Changs degradation rules was established to deeply understand the failure of a new material system CCF300/5428 under low velocity impact. User defined subroutines were developed and embedded into the general FEA software package to carry out the failure analysis. Numerical simulations provide more information about the failure of composite laminates under low velocity impact, including initial damage status, damage propagation and final failure status. The history of the impact point displacement and various damage patterns were detailed studied.

Abstract: The geological storage of has been recognized as an important strategy to reduce emission in the atmosphere. Coal seam has strong absorption capacity for , hence the coal seam can be used as geological storage reservoirs, simple and easy to use modeling tools would be valuable in assessing the performance of deep underground geological storage. In this paper failure process of coal seam in deep underground under triaxial compressive experiment is presented by numerical simulation. That is of significance and valuable to those subjects of investigation of strength of coal seam in deep underground and mechanism of propagation and coalescence and evolvement of crack for coal seam in deep underground, it is shown by numerical simulation that failure shape of coal seam in deep underground under triaxial compressive experiment of lateral pressure of 25Mpa is typically shear failure, and characteristic of deformation is obviously elastic-brittle, which is significance to understand the performance of the coal seam in deep underground

Abstract: Aimed at the needs of intelligent missile cooperative engagement mission, a relative navigation method based on INS/Vision is presented, and the relative inertial equation between leader missiles and attack ones is derived. The line of sight measurement is acquired by observing the beacons on the attack ones using the vision navigation equipment on the leader missiles. The extended Kalman filter is used to estimate the relative attitude, relative velocity and relative position by fusing the inertial navigation information and the line of sight measurement. Simulation results verify the effectiveness of the relative navigation method. Improve the estimated accuracy of missile in formation flight mechanics.