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【Abstract】The thermal characteristics of machine tools have emerged as one of the most important factors for the performance of high-speed machine tools The spindle is the key component of machine tools Thus the thermal characteristics of the spindle determine the maximum cutting speed and machining accuracy that machine tools can achieve
Thermal-hydromechanical (THM) coupling process is a key issue in geotechnical engineering emphasized by many scholars Most existing studies are conducted at macroscale or mesoscale This paper presents a pore-scale THM coupling study of the immiscible two-phase flow in the perfect-plastic rock Assembled rock matrix and pore space models are reconstructed using micro-CT image
A linear acoustic network model is used and all modes with frequency below the cut-on frequency for non-planar acoustic waves are considered The results show that when reflection coefficients are reduced the presence of a pure ITA mode limits the reduction in the growth rate that usually results from a reduction of the reflection coefficients
A thermal resilient integration of many-core microprocessors and main memory by 2 5D TSI I/Os One memory-logic-integration design platform is developed in this paper with thermal reliability analysis provided for 2 5D through-silicon-interposer (TSI) and 3D through-silicon-via (TSV) based integrations
We also note the complication that in the case of very strong e‐ph coupling a complete separation between lattice and electronic thermal conductivity may not always be possible We further state that the honeycomb domain walls network of topological excitations in NCCDW phase identified recently [ 33 ] may provide new phonon modes for heat
2 Adaptive Method to Reduce Thermal Deformation of Ball Screw In order to reduce the thermal deformation of ball screws an improved ball screw was designed by utilizing the negative thermal expansion coefficient of CFRP in the axial direction as illustrated in Figure 1 It should be noted that the direction of the fiber is parallel to the axial direction of the ball screw
Therefore the fluid-thermal-solid coupling analysis is also carried out The temperature distribution of scroll structures the thermal deformation and gap changes are also discussed in this study Scroll machine is simply constructed by fixed and orbit scrolls rotary shaft and some mechanical components
2019-12-13The radial and total displacements of the tissue for the coupled thermo-electro-mechanical model of MWA including only the thermal expansion term in the mechanical coupling i e neglecting the tissue shrinkage caused by protein denaturation have been presented in figures 4(c) and respectively It can be again observed from these figures
2019-3-8The heat results in thermal expansion which displaces the actuator and could change its electrical resistance Unlike with heating circuits deformation is a desired effect in thermal actuators as this is what enables their function Compared to other types of actuators thermal actuators provide a number of advantages
Thermal deformation of the package is directly related to its geometry and the material used in the package Moir interferometry is a whole-field optical interference technique with high resolution and high sensitivity for measuring the in-plane displacement and strain fields [3]
The established rigid-flexible-thermal coupled simulation is performed on a modified generalized-α integrator which solves the set of multidisciplinary governing equations synchronously For revealing the nonlinear behavior of the rigid-flexible-thermal coupled system the observed thermally induced vibration and perturbation on the pointing
Micro heat transfer induced by Ultrashort-pulsed lasers is an important research topic in mechanical engineering and material science In order to apply ultrashort-pulsed lasers successfully studying the thermal deformation in double-layered thin films with imperfect thermal interfacial contact induced by ultrashort-pulsed lasers is important for preventing thermal damage
A simple three‐dimensional heat transfer model is developed to consider the hindering effect of cracks on heat transfer The 3D heat transfer model can also be applied to numerical methods such as the combined finite‐discrete element method (FDEM) discrete element method (DEM) discontinuous deformation analysis (DDA) the numerical manifold method (NMM) and the finite element method
The internal contact feature and thermal induced dynamic preload is essential for ball bearing which is one of the key issues for thermal instability and stuck problems at high rotation speed This paper presented a thermo-mechanical coupling model for angular contact ball bearing with preload and temperature compensation for the purpose of dynamic preload monitoring
Thermal deformation of imprinted twist nematic is the strong coupling of macroscopic shape and the molecular (mesogen) orientation [1 2] One of the most familiar phenomena in LCEs is prepared LC network films with a twist orientation by using the chiral imprinting method These films –which were prepared by the homopolymerization of
Ultrashort-pulsed lasers with pulse durations on the order of sub-picoseconds to femtoseconds possess the capabilities in limiting the undesirable spread of the thermal process zone in a heated sample which have been attracting worldwide interest in science and engineering Success of ultrashort-pulsed lasers in real application relies on: (1) well characterized pulse width intensity and
The interplate geometry and coupling extension is better constrained (Kostoglodov et al 2003) than in the previous models (Currie et al 2002) We developed the 2-D steady-state thermal models using a numerical scheme with a system of 2-D steady-state heat transfer equation and 2-D Stokes equations
The interplate geometry and coupling extension is better constrained (Kostoglodov et al 2003) than in the previous models (Currie et al 2002) We developed the 2-D steady-state thermal models using a numerical scheme with a system of 2-D steady-state heat transfer equation and 2-D Stokes equations
The interplate geometry and coupling extension is better constrained (Kostoglodov et al 2003) than in the previous models (Currie et al 2002) We developed the 2-D steady-state thermal models using a numerical scheme with a system of 2-D steady-state heat transfer equation and 2-D Stokes equations
The transient finite element modeling of rotating electrical machines is described The coupled transient electromagnetic (EM) - thermal and thermo elastic model is simulated in the different physical domains by exploiting the large differences between EM thermal and mechanical characteristic times The performance of the technology is illustrated through the solution of large industrial problems
2011-2-7Simulations of thermal expansion near wellbore 3 Thermal conductivity = 1 3W/mK Youngs_modulus = 6 5GPa Poissons_ratio = 0 3 Thermal expansion = 2 0e-5/ K density = 2 4e3kg/m specific heat = 400 J/kg K 3 Thermal conductivity = 0 7W/mK Youngs_modulus = 0 5GPa Poissons_ratio = 0 3
2020-6-22The thermal parameter of ball screw such as heat generation of nut and the heat transfer coefficient of out surface is related with the rotational speed ω Therefore it is necessary to analyze the effects of rotational speed on thermal deformation reduction of ball screws according to the method based on CFRP under different rotational speed
Therefore the fluid-thermal-solid coupling analysis is also carried out The temperature distribution of scroll structures the thermal deformation and gap changes are also discussed in this study Scroll machine is simply constructed by fixed and orbit scrolls rotary shaft and some mechanical components
In this paper a strategy for analyzing a problem of the transient thermal coupling with the elastoplastic finite deformation is presented A general constitutive equation is deduced by assuming the material properties to be temperature‐dependent The thermal and mechanical coupling problem is solved with a staggered algorithm which partitions the coupled problem into an elasto‐plastic
2020-5-14Thermal analysis of the triple-phase asynchronous motor-reducer coupling system by thermal network method Mingzhang Chen Wuhao Zhuang Song Deng and Chengjie Zhu Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering 0 10 1177/0954407020916991
2018-1-28of rolling bearing subsequently the bearing is divided into thermal network nodes a thermal network model of bearings is established constructing and solving the heat balance equation Chen et al [5] established a temperature rise -thermal deformation model of the spindle during its operation discussed the effect of friction heat of main
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