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Sensitivity of springback and section deformation to process parameters in rotary draw bending of thin-walled rectangular H96 brass tube 被引量:8
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作者 朱英霞 刘郁丽 杨合 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第9期2233-2240,共8页
In order to study the effects of the process parameters on springback and section deformation, a sensitivity analysis model was established based on the combination use of the multi-parameter sensitivity analysis meth... In order to study the effects of the process parameters on springback and section deformation, a sensitivity analysis model was established based on the combination use of the multi-parameter sensitivity analysis method and the springback/section deformation prediction finite element model, and by using this model the sensitivities of the springback and the section deformation to process parameters were analyzed and compared. The results show that the most sensitive process conditions for springback angle are the boost speed and the pressure of pressure die, and the most sensitive process condition for section deformation is the number of cores. When the clamp force, the boost speed and the pressure of pressure die are utilized to control section deformation, the effect of these process parameters on springback should be considered. When the process parameters are mainly used to control springback, the effect of these process parameters on the section deformation should be always considered. 展开更多
关键词 thin-walled rectangular H96 brass tube rotary draw bending sensitivity analysis SPRINGBACK section deformation
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GEOMETRICALLY NONLINEAR FINITE ELEMENT MODEL OF SPATIAL THIN-WALLED BEAMS WITH GENERAL OPEN CROSS SECTION 被引量:11
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作者 Xiaofeng Wang Qingshan Yang 《Acta Mechanica Solida Sinica》 SCIE EI 2009年第1期64-72,共9页
Based on the theory of Timoshenko and thin-walled beams, a new finite element model of spatial thin-walled beams with general open cross sections is presented in the paper, in which several factors are included such a... Based on the theory of Timoshenko and thin-walled beams, a new finite element model of spatial thin-walled beams with general open cross sections is presented in the paper, in which several factors are included such as lateral shear deformation, warp generated by nonuni- form torsion and second-order shear stress, coupling of flexure and torsion, and large displacement with small strain. With an additional internal node in the element, the element stiffness matrix is deduced by incremental virtual work in updated Lagrangian (UL) formulation. Numerical examples demonstrate that the presented model well describes the geometrically nonlinear property of spatial thin-walled beams. 展开更多
关键词 spatial beams thin-walled structures geometrically nonlinear finite element stiffness matrix
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Cross-sectional distortion behaviors of thin-walled rectangular tube in rotary-draw bending process 被引量:7
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作者 赵刚要 刘郁丽 +1 位作者 杨合 卢彩红 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第3期484-489,共6页
The cross-sectional distortion usually appears during rotary-draw bending process of thin-walled rectangular tube with small bending radius.To study the cross-sectional distortion of the tube,a three-dimensional finit... The cross-sectional distortion usually appears during rotary-draw bending process of thin-walled rectangular tube with small bending radius.To study the cross-sectional distortion of the tube,a three-dimensional finite-element model of the process was developed based on ABAQUS/Explicit code and its reliability was validated by experiment.Then,the cross-sectional distortion behaviors of the tube were investigated.The results show that a zone of larger circumferential stress appears on the tube when bending angle reaches 30°.And in the larger circumferential stress zone,the sagging phenomenon is produced obviously.The maximum cross-sectional distortion is located in the larger circumferential stress zone and the angle between the plane of maximum cross-sectional distortion and the bending reference plane is about 50°.The position of the maximum cross-sectional distortion keeps almost unchanged with the variation of the clearances between dies and tube. 展开更多
关键词 thin-walled rectangular tube aluminum alloy 3A21 rotary-draw bending cross-sectional distortion die clearance
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Modeling and Free Vibration Behavior of Rotating Composite Thin-walled Closed-section Beams with SMA Fibers 被引量:4
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作者 REN Yongsheng YANG Shulian DU Xianghong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2012年第5期1029-1043,共15页
Smart structure with active materials embedded in a rotating composite thin-walled beam is a class of typical structure which is using in study of vibration control of helicopter blades and wind turbine blades. The dy... Smart structure with active materials embedded in a rotating composite thin-walled beam is a class of typical structure which is using in study of vibration control of helicopter blades and wind turbine blades. The dynamic behavior investigation of these structures has significance in theory and practice. However, so far dynamic study on the above-mentioned structures is limited only the rotating composite beams with piezoelectric actuation. The free vibration of the rotating composite thin-walled beams with shape memory alloy(SMA) fiber actuation is studied. SMA fiber actuators are embedded into the walls of the composite beam. The equations of motion are derived based on Hamilton's principle and the asymptotically correct constitutive relation of single-cell cross-section accounting for SMA fiber actuation. The partial differential equations of motion are reduced to the ordinary differential equations of motion by using the Galerkin's method. The formulation for free vibration analysis includes anisotropy, pitch and precone angle, centrifugal force and SMA actuation effect. Numerical results of natural frequency are obtained for two configuration composite beams. It is shown that natural frequencies of the composite thin-walled beam decrease as SMA fiber volume and initial strain increase and the decrease in natural frequency becomes more significant as SMA fiber volume increases. The actuation performance of SMA fibers is found to be closely related to the rotational speeds and ply-angle. In addition, the effect of the pitch angle appears to be more significant for the lower-bending mode ones. Finally, in all cases, the precone angle appears to have marginal effect on free vibration frequencies. The developed model can be capable of describing natural vibration behaviors of rotating composite thin-walled beam with active SMA fiber actuation. The present work extends the previous analysis done for modeling passive rotating composite thin-walled beam. 展开更多
关键词 free vibration thin-walled composite beams shape memory alloy rotating beams pich angle precone angle
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Nonlinear Free Vibration Analysis of Thin-walled Curved Beam with Non-symmetric Open Cross Section
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作者 段海娟 宋振森 《Journal of Shanghai Jiaotong university(Science)》 EI 2008年第2期150-154,共5页
A finite element formulation was presented for the nonlinear free vibration of thin-walled curved beams with non-symmetric open across section. The kinetic and potential energies were derived by the virtual principle.... A finite element formulation was presented for the nonlinear free vibration of thin-walled curved beams with non-symmetric open across section. The kinetic and potential energies were derived by the virtual principle. The energy function includes the effect of fiexural-torsional coupling, the torsion warping and the shear centre location. For finite element analysis, cubic polynomials were utilized as the shape functions of the two nodal thin-walled curved elements. Each node possesses seven degrees freedom including the warping degree of freedom. The nonlinear eigenvalue problem was solved by the direct iteration technique. The results are compared with those for straight beams as available in the literature. The results for nonlinear free vibration analysis of curved beams for various radii and subtended angle are presented. 展开更多
关键词 nonlinear vibration thin-walled curved beam finite element method virtual principle
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A new finite element of spatial thin-walled beams
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作者 王晓峰 张其林 杨庆山 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2010年第9期1141-1152,共12页
Based on the theories of Timoshenko's beams and Vlasov's thin-walled members, a new spatial thin-walled beam element with an interior node is developed. By independently interpolating bending angles and warp, factor... Based on the theories of Timoshenko's beams and Vlasov's thin-walled members, a new spatial thin-walled beam element with an interior node is developed. By independently interpolating bending angles and warp, factors such as transverse shear deformation, torsional shear deformation and their Coupling, coupling of flexure and torsion, and second shear stress are considered. According to the generalized variational theory of Hellinger-Reissner, the element stiffness matrix is derived. Examples show that the developed model is accurate and can be applied in the finite element analysis of thinwalled structures. 展开更多
关键词 spatial beams thin-walled section stiffness matrix shear deformation coupling of flexure and torsion second shear stress
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Elastic buckling analysis and optimization of thin-walled bamboo-like pipe beam subjected to pure bending
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作者 Yayun YU Dongli MA +2 位作者 Liang ZHANG Xiaopeng YANG Hao GUAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第3期133-152,共20页
In this paper,a stiffening design imitating the bamboo node is proposed for weight reduction of the long composite pipe beam subjected to bending load.The distribution of bamboo nodes can efficiently suppress the oval... In this paper,a stiffening design imitating the bamboo node is proposed for weight reduction of the long composite pipe beam subjected to bending load.The distribution of bamboo nodes can efficiently suppress the ovalization of the section,thus significantly improving the bending resistance of the bamboo.Based on this principle,ring stiffeners are proposed to be fixed to the pipe beam,making the long beam equivalent to the combination of a series of short pipes that suffered less section ovalization.A database of the optimal laminate orientations for different normalized lengths is obtained through optimizations,where the discreteness of the ply count is considered.Based on this database,weight optimizations are conducted,and the optimal designs of beams with and without stiffeners are obtained and compared.The comparison results show that the proposed bamboo-like stiffened beam not only regains a near-linear load–displacement relationship,but also reduces the weight by up to 16%under the same buckling load.In addition,it is found that for the pipe beams with radius-to-thickness ratios of more than 18,increasing the radius leads to a decrease in elastic buckling resistance when the weight remains a constant,which is opposite to the design for strength and stiffness.The model and database developed in this paper can provide a reference for weight reduction design and weight estimation for composite pipe beams. 展开更多
关键词 Composite beam BUCKLING thin-walled structure Unmanned aerial vehicles BAMBOO
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Symmetric Equations for Evaluating Maximum Torsion Stress of Rectangular Beams in Compliant Mechanisms 被引量:3
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作者 Gui-Min Chen Larry L.Howell 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2018年第1期34-40,共7页
There are several design equations available for calculating the torsional compliance and the maximum torsion stress of a rectangular cross-section beam, but most depend on the relative magnitude of the two dimensions... There are several design equations available for calculating the torsional compliance and the maximum torsion stress of a rectangular cross-section beam, but most depend on the relative magnitude of the two dimensions of the crosssection(i.e., the thickness and the width). After reviewing the available equations, two thickness-to-width ratio Independent equations that are symmetric with respect to the two dimensions are obtained for evaluating the maximum torsion stress of rectangular cross-section beams. Based on the resulting equations, outside lamina emergent torsional joints are analyzed and some useful design Insights are obtained. These equations, together with the previous work on symmetric equations for calculating torsional compliance, provide a convenient and effective way for designing and optimizing torsional beams in compliant mechanisms. 展开更多
关键词 Compliant mechanism Maximum torsion stress rectangular beam Lamina emergent joint
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Optimal design of sub-wavelength metal rectangular gratings for polarizing beam splitter based on effective medium theory 被引量:3
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作者 赵华君 彭拥军 +3 位作者 谭菊 廖长荣 李鹏 任晓霞 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第12期5326-5330,共5页
A novel optimal design of sub-wavelength metal rectangular gratings for the polarizing beam splitter (PBS) is proposed. The method is based on effective medium theory and the method of designing single layer antiref... A novel optimal design of sub-wavelength metal rectangular gratings for the polarizing beam splitter (PBS) is proposed. The method is based on effective medium theory and the method of designing single layer antireflection coating. The polarization performance of PBS is discussed by rigorous couple-wave analysis (RCWA) method at a wavelength of 1550 nm. The result shows that sub-wavelength metal rectangular grating is characterized by a high reflectivity, like metal films for TE polarization, and high transmissivity, like dielectric films for TM polarization. The optimal design accords well with the results simulated by RCWA method. 展开更多
关键词 polarizing beam splitter sub-wavelength metal rectangular gratings effective medium theory ANTIREFLECTION
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EXACT ANALYSIS OF WAVE PROPAGATION IN AN INFINITE RECTANGULAR BEAM 被引量:2
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作者 孙卫明 杨光松 李东旭 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第7期768-778,共11页
The Fourier series method was extended for the exact analysis of wave propagation in an infinite rectangular beam.Initially,by solving the three-dimensional elastodynamic equations a general analytic solution was deri... The Fourier series method was extended for the exact analysis of wave propagation in an infinite rectangular beam.Initially,by solving the three-dimensional elastodynamic equations a general analytic solution was derived for wave motion within the beam.And then for the beam with stress-free boundaries,the propagation characteristics of elastic waves were presented.This accurate wave propagation model lays a solid foundation of simultaneous control of coupled waves in the beam. 展开更多
关键词 infinite rectangular beam wave propagation exact analysis Fourier series traveling wave active control
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Simulation Analysis of Torsion Beam Hydroforming Based on the Fluid-Solid Coupling Method 被引量:2
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作者 Yu Huang Jian Li +2 位作者 Jiachun Yang Yongdong Peng Weixuan Zhang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第1期139-156,共18页
Hydroformed parts are widely used in industrial automotive parts because of their higher stiffness and fatigue strength and reduced weight relative to their corresponding cast and welded parts.This paper reports a hyd... Hydroformed parts are widely used in industrial automotive parts because of their higher stiffness and fatigue strength and reduced weight relative to their corresponding cast and welded parts.This paper reports a hydraulicforming experimental platform for rectangular tube fittings that was constructed to conduct an experiment on the hydraulic forming of rectangular tube fittings.A finite element model was established on the basis of the fluid–solid coupling method and simulation analysis.The correctness of the simulation analysis and the feasibility of the fluid–solid coupling method for hydraulic forming simulation analysis were verified by comparing the experimental results with the simulation results.On the basis of the simulation analysis of the hydraulic process of the torsion beam using the fluid–solid coupling method,a sliding mold suitable for the hydroforming of torsion beams was designed for its structural characteristics.The effects of fluid characteristics,shaping pressure,axial feed rate,and friction coefficient on the wall thicknesses of torsions beams during formation were investigated.Fluid movement speed was related to tube deformation.Shaping pressure had a significant effect on rounded corners and straight edges.The axial feed speed was increased,and the uneven distribution of wall thicknesses was effectively improved.Although the friction coefficient had a nonsignificant effect on the wall thickness of the ladder-shaped region,it had a significant influence on a large deformation of wall thickness in the V-shaped area.In this paper,a method of fluid-solid coupling simulation analysis and sliding die is proposed to study the high pressure forming law in torsion beam. 展开更多
关键词 Fluid-solid coupling Hydraulic expansion rectangular tube Torsional beam Wall thickness distribution
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Rectangular Microstrip Antenna for Symmetrical 3-D Beam Widths for an Efficient Feed of Reflector Antenna and its Quantitative Analysis
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作者 Jitendra Kr. Sah Sun Chatterjee +3 位作者 Pragya Bharati Dia Ghosh Aditi Anand Sudipta Chattopadhyay 《Journal of Electromagnetic Analysis and Applications》 2012年第6期230-234,共5页
A simple rectangular microstrip antenna on low dielectric constant substrate such as air for improved radiation beam performance is theoretically investigated. The conventional patch antenna fabricated on common subst... A simple rectangular microstrip antenna on low dielectric constant substrate such as air for improved radiation beam performance is theoretically investigated. The conventional patch antenna fabricated on common substrates always produces quite broader E plane pattern compared to its H plane. In the present investigation, the same microstrip antenna is designed on air substrate with a view to develop an efficient feed for parabolic reflector antenna, which shows an excellent radiation pattern with symmetrical 3 dB beam widths at its both E and H plane. The present antenna compared to conventional structure to show its excellence in the beam performance is presented. The complete quantitative analysis to explore such radiation beam characteristics for both the structures (conventional and the present one) is also presented in this paper. An easy and handful relationship between the length of patch antenna and its fringing length for different types of substrate is established in the background of 3 dB beam widths. The proposed idea has been verified through a commercial software package for a patch operating in X band and a concrete physical insight into the phenomenon is developed. 展开更多
关键词 Air SUBSTRATE rectangular MICROSTRIP Antenna SYMMETRICAL beam widths.
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A nonlinear explicit dynamic GBT formulation for modeling impact response of thin-walled steel members
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作者 Duan Liping Zhao Jincheng 《Journal of Southeast University(English Edition)》 EI CAS 2018年第2期237-250,共14页
A nonlinear explicit dynamic finite element formulation based on the generalized beam theory(GBT)is proposed and developed to simulate the dynamic responses of prismatic thin-walled steel members under transverse impu... A nonlinear explicit dynamic finite element formulation based on the generalized beam theory(GBT)is proposed and developed to simulate the dynamic responses of prismatic thin-walled steel members under transverse impulsive loads.Considering the rate strengthening and thermal softening effects on member impact behavior,a modified Cowper-Symonds model for constructional steels is utilized.The element displacement field is built upon the superposition of GBT cross-section deformation modes,so arbitrary deformations such as cross-section distortions,local buckling and warping shear can all be involved by the proposed model.The amplitude function of each cross-section deformation mode is approximated by the cubic non-uniform B-spline basis functions.The Kirchhoff s thin-plate assumption is utilized in the construction of the bending related displacements.The Green-Lagrange strain tensor and the second Piola-Kirchhoff(PK2)stress tensor are employed to measure deformations and stresses at any material point,where stresses are assumed to be in plane-stress state.In order to verify the effectiveness of the proposed GBT model,three numerical cases involving impulsive loading of the thin-walled parts are given.The GBT results are compared with those of the Ls-Dyna shell finite element.It is shown that the proposed model and the shell finite element analysis has equivalent accuracy in displacement and stress.Moreover,the proposed model is much more computationally efficient and structurally clearer than the shell finite elements. 展开更多
关键词 generalized beam theory impact loading thin-walled steel member explicit dynamic integrations strain rate strengthening effect thermal softening effect
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ELECTRON OPTICS OF VARIABLE RECTANGULAR SHAPED BEAM LITHOGRAPHY SYSTEM D J-2
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作者 康念坎 《Journal of Electronics(China)》 1993年第2期170-180,共11页
The electron optical column for the variable rectangular-shaped beam lithographysystem DJ-2 is described,with emphasis on the analysis of the optical configuration and theshaping deflection compensation.In this column... The electron optical column for the variable rectangular-shaped beam lithographysystem DJ-2 is described,with emphasis on the analysis of the optical configuration and theshaping deflection compensation.In this column the variable spot shaping is performed with aminimum number of lenses by a more reasonable optical scheme.A high-sensitivity electrostaticshaping deflector with sequential parallel-plates is implemented for high-speed spot shaping.With a precise linear and rotational approach,the spot current density,the edge resolution aswell as the position of spot origin remain unchanged when the spot size varies.Experiments showthat the spot current density of over 0.4 A/cm^2 is obtained with a tungsten hairpin cathode,andthe edge resolution is better than 0.2μm within a 2×2 mm^2 field size. 展开更多
关键词 ELECTRON optics ELECTRON beam LITHOGRAPHY VARIABLE rectangular-shaped beam
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Linear theory of a dielectric-loaded rectangular Cerenkov maser with a sheet electron beam
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作者 陈晔 赵鼎 +2 位作者 刘文鑫 王勇 万晓声 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第10期245-250,共6页
A three-dimensional model of a dielectric-loaded rectangular Cerenkov maser with a sheet electron beam for the beam-wave interaction is proposed.Based on this model,the hybrid-mode dispersion equation is derived with ... A three-dimensional model of a dielectric-loaded rectangular Cerenkov maser with a sheet electron beam for the beam-wave interaction is proposed.Based on this model,the hybrid-mode dispersion equation is derived with the Borgnis potential function by using the field-matching method.Its approximate solution is obtained under the assumption of a dilute electron beam.By using the Ansoft high frequency structural simulator(HFSS) code,the electromagnetic field distribution in the interaction structure is given.Through numerical calculations,the effects of beam thickness,beam and dielectric-layer gap distance,beam voltage,and current density on the resonant growth rate are analysed in detail. 展开更多
关键词 rectangular Cerenkov maser beam-wave interaction hybrid-mode dispersion equation Borgnis potential function
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工字形钢梁-矩形钢管柱单向螺栓节点抗弯承载力理论计算方法
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作者 李国强 蒋蕴涵 +2 位作者 陈琛 王苑佐 王彦博 《土木工程学报》 EI CSCD 北大核心 2024年第2期35-45,共11页
针对工字形纯钢梁和钢-混凝土组合梁分别与矩形钢管柱和矩形钢管混凝土柱采用单向螺栓(也称单边拧紧螺栓)连接形成的4种节点形式,对其在弯矩作用下的受力机理及破坏模式进行分析,讨论导致节点失效的因素。总结节点在弯矩作用下的9种失... 针对工字形纯钢梁和钢-混凝土组合梁分别与矩形钢管柱和矩形钢管混凝土柱采用单向螺栓(也称单边拧紧螺栓)连接形成的4种节点形式,对其在弯矩作用下的受力机理及破坏模式进行分析,讨论导致节点失效的因素。总结节点在弯矩作用下的9种失效模式,包括:单向螺栓拉断、端板受弯屈服、矩形钢管柱壁翼板受拉屈服、矩形钢管柱壁翼板受压屈服、矩形钢管柱壁腹板受压屈曲、混凝土楼板局部压溃、钢筋屈服、矩形钢管柱内混凝土局部压溃、矩形钢管柱壁腹板受压屈服,进而基于破坏模式给出节点各组件承载力的计算公式。对4种节点在不同破坏模式下的正弯矩承载力和负弯矩承载力进行分析,给出节点承载力计算公式。将节点抗弯承载力的理论计算结果与试验结果进行对比,验证理论计算方法的可靠性。 展开更多
关键词 工字形钢梁 矩形钢管柱 单向螺栓 节点 抗弯承载力
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Application of stiffness matrix of a beam element considering section distortion effect 被引量:2
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作者 李海锋 罗永峰 《Journal of Southeast University(English Edition)》 EI CAS 2010年第3期431-435,共5页
According to the stationary principle of potential energy and the generalized coordinate method, a stiffness matrix of a beam element considering distortion effects is derived. Using the stiffness matrix of the beam e... According to the stationary principle of potential energy and the generalized coordinate method, a stiffness matrix of a beam element considering distortion effects is derived. Using the stiffness matrix of the beam element, a finite element program for computing thin-walled box steel beams is developed. And the program can take the section distortion and warping effects into account. The influences of diaphragm spacing on the mechanical behavior of thin-walled box beams are analyzed by the program. The numerical analysis shows that setting diaphragms have the greatest influence on the distortion normal stress, while there is very little influence on the bending normal stress. Only when the distance of adjacent diaphragms decreases to a certain value, will the distortion normal stress in the thin-walled box beam obviously reduce under the distortion load. Finally, a distortion-warping coefficient γ is introduced for simplifying the calculation of the longitudinal normal stress of thin-walled box beams. When the ratio of diaphragms adjacent space L to the maximum section dimension H is less than 2, the distortion-warping coefficient γ tends to one, which means that the distortion normal stress of the thin-walled box beam tends to zero, and the effect of the section distortion can be ignored. 展开更多
关键词 thin-walled box beam stationary principle of potential energy generalized coordinate method DISTORTION WARPING distortion-warping coefficient
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基于板-梁理论的FGM矩形截面杆扭转振动的理论研究
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作者 张文福 周季虎 《苏州科技大学学报(自然科学版)》 CAS 2024年第2期9-16,共8页
基于板-梁理论和Saint-Venant扭转理论的研究成果,将纵向位移假设为含有待定系数的表达式,通过几何方程推导了功能梯度材料矩形截面杆的总应变能方程,并利用最小应变能原理确定待定系数,得到自由扭转刚度的理论公式。在此基础上对矩形... 基于板-梁理论和Saint-Venant扭转理论的研究成果,将纵向位移假设为含有待定系数的表达式,通过几何方程推导了功能梯度材料矩形截面杆的总应变能方程,并利用最小应变能原理确定待定系数,得到自由扭转刚度的理论公式。在此基础上对矩形截面杆的自由振动出现纯扭转模态时的动能进行研究,求出在夹支条件下的扭转振动时的动能表达式、总势能的表达式及频率表达式。利用有限元软件ANSYS建立具有功能梯度材料特性的矩形截面杆的扭转振动的有限元模型,通过后处理命令查看对应边界条件的振动频率。通过有限元软件验证表明:基于板-梁理论推导得出的理论解与有限元解吻合较好,最大误差在4%以内。 展开更多
关键词 功能梯度 矩形截面杆 扭转振动 板-梁理论 有限元
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基于ANSYS的多向模锻液压机的结构优化
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作者 王子超 辛绍杰 +1 位作者 刘吉成 胡立水 《计量与测试技术》 2024年第8期58-61,共4页
针对零件的生产效率问题,本文以某公司设计的一种新型组合式多向模锻液压机为例。利用UG和ANSYS软件建立有限元模型,对其机身框架进行静力学结构分析,得到三个主要部件的应力及变形情况,即上横梁、下横梁及矩形立柱。同时,在满足强度和... 针对零件的生产效率问题,本文以某公司设计的一种新型组合式多向模锻液压机为例。利用UG和ANSYS软件建立有限元模型,对其机身框架进行静力学结构分析,得到三个主要部件的应力及变形情况,即上横梁、下横梁及矩形立柱。同时,在满足强度和刚度的前提下,对其进行结构优化改进,从而降低液压机的生产安装成本。结果表明:该机身质量整体降低为18684kg,可为多向模锻液压机的生产设计提供理论参考。 展开更多
关键词 液压机 上横梁 下横梁 矩形立柱 结构优化
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E波段矩形环对角双杆行波管的研究
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作者 朱焜 魏望和 丁文豪 《科学技术创新》 2024年第17期221-224,共4页
高功率、宽频带是当前科研人员研究行波管的主流方向,中国工信部最新规定E波段的频率范围在71-76 GHz/81-86 GHz。虽然传统的环圈慢波结构有更高的互作用阻抗,但是当其达到E波段及以上由于其结构特点在现实中难以加工,所以难以实现工作... 高功率、宽频带是当前科研人员研究行波管的主流方向,中国工信部最新规定E波段的频率范围在71-76 GHz/81-86 GHz。虽然传统的环圈慢波结构有更高的互作用阻抗,但是当其达到E波段及以上由于其结构特点在现实中难以加工,所以难以实现工作在E波段,为了提升输出功率,本文设计了E波段矩形环对角双杆慢波结构行波管的研究,对其进行注波互作用模拟仿真和计算,带状电子注采用19.1 kV的电压,电流为0.14 A的条件下,行波管可获得最大400 W的瞬时输出功率,增益为46.02 dB、电子效率15%。 展开更多
关键词 矩形环对角双杆 行波管 注波互作用 E波段
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