速度滑冰力量训练器液阻系统的设计及分析（英文）

速度滑冰力量训练器一直都是速度滑冰运动员训练过程中的一个短缺,研制一种新型的、能适应运动员训练的体育器材十分必要。针对这个问题,对一种新型速度滑冰力量训练器的阻力施加装置进行了设计,并在AMESim环境下建立了该阻力施加装置的仿真模型,对影响该训练器阻力大小的因素进行了仿真,验证了该装置的合理性,为该训练器及其他装置阻力施加装置的设计及分析提供了理论依据。     

基于AMESim的一种速度滑冰起跑训练器建模与仿真

速度滑冰是我国冬季奥运会的金牌重点争夺项目,目前的训练方法效率低,不利于运动员力量的提升及技术动作的掌握,因此需要研发新型的训练器械,高效帮助运动员进行起跑训练。提出一种速度滑冰起跑训练器,采用系统参数设计理论和AMEAim系统仿真技术,完成速度滑冰起跑训练器液压回路的系统设计。基于AMESim的液压元件设计库建立系统回路仿真模型,分析各回路系统压力特性、流量特性和扭矩特性,并验证系统设计的合理性。     

一种带阻力墙的新型飞边槽结构设计

设计了一种结构新颖的具有阻力墙的飞边槽结构,介绍了该新型飞边槽结构的特点.以阻力墙的形状及位置参数为主要设计指标,利用建立的有限元模型,分析了阻力墙参数对汽车曲轴模锻成形的影响.通过对仿真结果分析,对阻力墙的关键参数进行了设计、优化,获得了4拐曲轴锻模飞边槽结构中阻力墙的斜度、间隙及距模具型腔的位置等参数.生产实践表明,带阻力墙的新型飞边槽结构在保证锻件成形饱满的前提下可以显著降低成形中的变形抗力,为提高曲轴模具寿命创造了良好的条件.     

应用于推拿教学的气动式人体器官模拟装置设计研究

为了解决传统推拿训练引起医患纠纷等问题,设计一种新型的气动式人体器官模拟装置。研制一种气动驱动系统,建立胸/腹腔模拟器数学模型,仿真分析了压力和压缩位移等因素对胸/腹腔模拟器刚度特性的影响,实验验证了模型的有效性。结果表明:改变模拟器压力可模拟不同年龄段患者的胸/腹腔刚度。研究结果可为设计新型的推拿教学训练装置提供依据。     

海上铺管软管滚筒驱动装置液压系统设计与仿真研究

针对国内海上软管铺设滚筒驱动装置的研究现状,设计一种新型的软管滚筒液压驱动装置.该装置使用液压马达驱动滚筒,带有一定扭矩进行顺时针和逆时针旋转,即带一定张力进行软管的施放和回收.利用Matlab Simscape建立液压系统数学模型,进行系统性能仿真分析.仿真结果表明该滚筒驱动装置在软管施放和回收工作状态下滚筒转动平稳,能够满足海上软管铺设要求.     

分离式霍普金森压杆试验台液压加载系统的研究

为了研究有压情况下材料在冲击载荷下的力学行为,研制一种在一般分离式霍普金森压杆(SHPB)装置基础上施加两自由度负载的新型SHPB试验台液压加载系统。研究试件机械加载方式,提出密封粉末加载方法,并根据要求设计液压比例控制系统作为加载系统;由压力传感器、位移传感器和数据采集卡等与上位机构成液压加载控制系统,对液压缸压力进行实时监控;用Simulink软件对控制系统进行仿真。仿真结果表明,该系统可以实现对试件的恒定压力加载。     

车载集装箱翻转装置的设计与分析

本文以满足集装箱翻转的工作需求,设计出一种新型的五杆机构车载集装箱翻转装置,具有可靠性高、结构简单、性价比高等优点,在此基础上,通过利用达朗贝尔原理对该翻转装置进行了动态静力学建模,并进行了求解;随后建立了该翻转装置的三维模型,并对该机构进行了构型的分析及仿真,通过分析从而选取合适的工作方式。通过对该种车载集装箱翻转装置的分析、建模、仿真,验证了该机构的可行性,为进一步研究和改善集装箱翻转装置自动化水平提供了参考。     

新型万向驱动轮结构设计及仿真研究

针对爬壁行走机器人驱动轮装置存在结构单一,工作过程中不能很好地过滤掉因墙面凹凸不平产生的冲击载荷,进而影响机器人行走的稳定性等问题,设计了一种新型万向驱动轮装置。首先概述了该装置各结构部件的组成、特殊的结构设计及工作方式,并利用SOLIDWORKS进行了三维结构模型创建。其次对主动轮装置的核心受力部件-主动轮装置主轴进行了力学分析,并通过Workbench进行了静力结构仿真,验证了力学分析结果的正确性。最后通过ADAMS进行了运动学仿真,仿真结果表明该驱动轮装置能够有效过滤掉与路面之间产生的冲击载荷,可以保证行走机器人工作更加平稳,为后期新型行走机器人的研制及开发提供理论依据和创造条件。     

基于AMESim的一种取样装置的仿真

介绍了一种新型取样装置的结构和工作原理,并基于AMESim高级建模和仿真平台对其进行了建模和仿真分析.针对该取样装置在不同工作参数下的动态特性进行研究,并利用实验验证了仿真模型的正确性.实验和仿真结果表明:在合适的系统工作参数下,该系统性能稳定,在物料粒度检测系统中具有良好的应用前景.     

冲击载荷下磁流变阻尼器控制系统仿真研究

应用于火炮反后坐装置中的磁流变阻尼器可代替制退机提供后坐阻力.为得到理想的后坐阻力动态特性,要求其阻尼力控制系统响应快速,以实现阻尼力的输出跟踪控制.对所设计长行程磁流变阻尼器进行了冲击试验,测试其输出阻力的动态响应时间.由于试验结果并不理想,因此利用非线性逆系统方法对磁流变阻尼器跟踪控制系统进行了设计校正.最后,对校正后的磁流变阻尼器控制系统及后坐阻力动态特性进行了仿真分析,结果表明,改进设计后的磁流变阻尼器控制系统具有良好的跟踪性能,后坐阻力动态特性令人满意.     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.