Research on the strain gauge mounting scheme of track wheel force measurement system based on high-speed wheel/rail relationship test rig

Purpose-This paper aims to analyze the stress and strain distribution on the track wheel web surface and study the optimal strain gauge location for force measurement system of the track wheel.Design/methodology/approach-Finite element method was employed to analyze the stress and strain distribution on the track wheel web surface under varying wheel-rail forces.Locations with minimal coupling interference between vertical and lateral forces were identified as suitable for strain gauge installation.Findings-The results show that due to the track wheel web’s unique curved shape and wheel-rail force loading mechanism,both tensile and compressive states exit on the surface of the web.When vertical force is applied,Mises stress and strain are relatively high near the inner radius of 710 mm and the outer radius of 1110mmof the web.Under lateral force,high Mises stress and strain are observed near the radius of 670mmon the inner and outer sides of the web.As the wheel-rail force application point shifts laterally toward the outer side,the Mises stress and strain near the inner radius of 710 mm of the web gradually decrease under vertical force while gradually increasing near the outer radius of 1110 mm of the web.Under lateral force,the Mises stress and strain on the surface of the web remain relatively unchanged regardless of the wheel-rail force application point.Based on the analysis of stress and strain on the surface of the web under different wheel-rail forces,the inner radius of 870 mm is recommended as the optimal mounting location of strain gauges for measuring vertical force,while the inner radius of 1143 mm is suitable for measuring lateral force.Originality/value-The research findings provide valuable insights for determining optimal strain gauge locations and designing an effective track wheel force measurement system.

Technology of load-sensitivity used in the hydraulic system of an all-hydraulic core rig

The existing hydraulic system always have problems of temperature rise,runningstability and anti-interference of the implementation components,reliability of hydrauliccomponents,maintenance difficulties,and other issues.With high efficiency,energysaving,reliability,easy operating,stable running,anti-interference ability,and other advantages,the load-sensitive hydraulic system is more suitable for coal mine all-hydrauliccore rig.Therefore,for the technical development of the coal mine all-hydraulic core rig,the load-sensitive technology employed by the rig should be of great significance.

Design and Development of Hydraulic Disc Brake Systems for Well Servicing Rig Drawworks

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Automatic lifting system design and application of large load powered support test rig

This paper presented a design of an automatic lifting system. It is used for large load powered support and improves the old method wherein powered support lifting depends on manual control. This system applies a high accuracy gear shunt motor to match the flow for 4 lifting cylinders, and also allocates bypass throttles to realize automatic lifting. Through the dis- placement sensor feedback the height deviation among 4 lifting cylinders during the whole lifting process, when the deviation is up to the sitting value, the corresponding bypass throttle is operated immediately to reduce the deviation, so that the moving platform of the powered support would not be stuck. Through real application, it is shown that this system can realize automatic lifting of powered support; the lifting speed is controlled between 5 and 10 mm/s, and the final aligning accuracy is up to 1 mm.

Development of a Test Rig for Axial Strains Measurement in Automobile Wheel

In automobile wheel application, a test rig is vital and used to simulate conditions of the wheel in service in order to affirm the safety and reliability of the wheel. The present work designed a test rig for measuring axial strains in automobile wheel. The wheel used was a five-arm wheel (6JX14H2;ET 42) and Tyre (175 × 65 R 14). Experimental (EXP) test was carried out, with a radial load of 4750 N and inflation pressure of 0.3 MPa, to measure the axil strains which were converted to maximum principal strain values and, compared with data from Finite Element Analysis (FEA) using Creo-Element/Pro 5.0 at wheel’s contact angles of 90 degree (FEA 90 deg), 40 degree (FEA 40 deg) and 30.25 degree (FEA 30.25 deg), respectively. Results show that at the wheel’s point of contact with the ground, maximum principal strain values were highest at the inboard bead seat with a value of about 5.69 × 10-4 mm/mm, followed by the values at the well of about 5.66 × 10-4 mm/mm. The value at the outboard bead seat was least at about 2.22 × 10-4 mm/mm, which was due to the presence of spikes at this location that tends to resist imposed radial loads. However, the highest mean maximum principal strain values at the locations of inboard, well and outboard, were about 2.11 × 10-4 mm/mm, 3.78 × 10-4 mm/mm and .99 × 10-4 mm/mm, respectively. With the highest single value of about 5.69 × 10-4 mm/mm, the inboard bead seat was the most strained location of the wheel. Overall results showed that all values of maximum principal strains were below the threshold value of about 1 × 10-2 mm/mm. The values obtained for EXP and FEA could be said to be in close agreement when compared with the threshold value. With this in mind, the rig is recommended for use in related experimental procedures.

Finite Element Analysis of Jumbo Rig Assembly for Tunneling

This paper describes the force acting the assembly of the jumbo rig for tunneling.The finite element analysis is used to calculate this machine structure on its different working states.

海洋模块钻机高压泥浆系统的研制

在充分考虑南海海域海洋环境、钻井平台结构特点、行业标准、用户要求的基础上,研制了能够满足钻井、固井、井口压力控制等作业要求的海洋模块钻机高压泥浆系统。论述了设计原则,介绍了高压泥浆系统的功能,并分析了关键技术。现场试验及应用表明,海洋模块钻机高压泥浆系统整体性能良好,工艺流程满足钻井平台功能要求,冗余可靠,结构布置紧凑合理,空间利用率高,操作方便,各项指标均达到设计要求。

露天潜孔钻机随钻测量系统研发与应用研究

露天采矿随钻测量技术研究目前尚处于初期阶段,研发随钻参数测量系统是实现随钻测量技术服务于采矿工程行业的首要任务。基于TAIYE-390-Ⅱ潜孔钻机工作原理,确定了随钻参数,提出了一套通用的测量方法,并研发了测量装置。装置主要由数据采集系统、数据转换系统和数据处理系统组成,可实现对钻进时间、钻进深度、钻进速度、钻杆轴压、回转力矩、回转速度、冲击风压和冲击风量等参数的实时准确测量、采集、计算、存储、显示和远程传输。结合某石灰岩矿钻孔数据,提出了一种反映岩性变化的数据整合方法,并借助钻孔成像试验分析了随钻测量技术在岩体结构面识别中的可行性。结果表明钻进速度和回转力矩对岩体结构响应最为灵敏,冲击风量和冲击风压在钻凿含孔洞的破碎岩体时表现突出,而钻杆轴压和回转速度在岩体结构识别中作用较小。研究成果在潜孔钻机随钻测量系统研发和随钻岩性识别等方面具有重要的理论意义和应用价值。

机液串联式钻机推进系统设计与仿真分析

针对工程钻机推进系统存在的行程大而造成体积和质量大的问题,基于其工作机制进行研究,提出一种机液串联式的钻机推进系统,详细阐述了其工作原理,推导了钻机推进位移与电液比例阀阀门开度的函数关系式。理论分析和仿真验证表明:机液串联式的推进系统具有省距不省力的特点;在钻机工作过程中,动力头的推进速度和位移可达到液压油缸的2倍,液压油缸传递至动力头的推进力为液压油缸活塞输出力的一半,从而减少了钻机桅杆的长度,降低了推进系统的体积和质量;通过电液比例阀调节阀门开度,可以调节动力头的推进位移和速度,使得钻机推进系统满足不同工况的需求。

基于改进RIG算法的动态诊断策略生成

针对TEAMS生成的静态诊断策略无法满足现场诊断的需求,在研究rollout信息启发式(RIG)算法的基础上,提出了一种基于改进RIG算法的动态诊断策略生成方法。首先通过改进原有的RIG算法使之符合动态诊断的需要;然后根据现场诊断过程中出现的各种具体情况,获取局部D矩阵;在此基础上利用改进的RIG算法选择出下一步最佳的测试,最终实现了故障诊断策略的动态生成。仿真实例表明,若直接采用基于RIG算法的静态诊断策略,需要4种类型的测试;若采用基于改进RIG算法的动态诊断策略生成方法,只需选择一步测试即能诊断出系统故障。该方法能够实现维修人员的交互式诊断,有效地提高了故障诊断策略的实用性。

甘露消毒丹及其挥发油对流感病毒感染小鼠RIGⅠ/NF-κB信号通路的影响

目的观察甘露消毒丹及其挥发油对流感病毒感染小鼠血清中白细胞介素4(IL-4)、肿瘤坏死因子α(TNF-α)、干扰素α/β(IFN-α/β)含量及肺组织中非结构蛋白1(NS1)、维甲酸诱导基因Ⅰ(RIG-Ⅰ)mRNA、核因子κB(NF-κB)蛋白的影响,以探讨甘露消毒丹及其挥发油抗病毒作用的分子机制。方法选择SPF级BALB/c小鼠36只,雌雄各半,随机分为6组,分别为正常组、模型组、灌胃组、滴鼻组、灌胃滴鼻合用组、奥司他韦组,每组6只。除正常组外,其余5组以流感病毒FM1-6-E2滴鼻造模。于造模后第7天,摘眼球放血处死小鼠,通过透射电子显微镜对肺组织进行检测以及图像分析,采用ELISA法测定血清中IL-4、TNF-α、IFN-α/β含量,qRT-PCR检测各组小鼠肺组织中NS1、RIG-ⅠmRNA的表达,Western blot方法测定各组小鼠肺组织NF-κB蛋白的表达。结果 (1)流感病毒感染后模型小鼠肺组织超微结构可见Ⅱ型细胞坏死、肺泡结构破坏,肺泡腔内纤毛增粗、脱落,形成肺部炎症;各治疗组均可改善肺泡Ⅱ型上皮细胞超微结构的异常改变。(2)流感病毒感染小鼠后,血清中IL-4、TNF-α、IFN-α/β的含量及肺组织中的NS1、RIG-ⅠmRNA、NF-κB蛋白表达均高于正常组,模型组与正常组比较,差异显著;与模型组比较,灌胃组、滴鼻组、灌胃滴鼻合用组、奥司他韦组血清中IFN-α/β含量显著升高,IL-4、TNF-α含量及NS1 mRNA、RIG-ⅠmRNA、NF-κB蛋白表达明显下调(P<0.05),甘露消毒丹各治疗组不同剂型抗流感病毒作用差异有统计学意义(P<0.05),灌胃滴鼻合用组>灌胃组>滴鼻组。结论甘露消毒丹具有抗流感病毒感染的作用,通过抑制RIG-Ⅰ/NF-κB信号传导通路的活化,阻止炎症的病理反应,提高免疫因子含量,降低流感病毒引起的免疫炎性损伤。

深水海底连续管钻机起升系统设计与仿真研究

以深水连续管钻机为对象,针对连续管钻机不能下套管的问题,设计了一种以液压绞车、钢丝绳和滑轮组合且与连续管钻机集成的起升系统。该系统在保证深水连续管钻井作业的同时,还能够实现下套管作业。构建了起升系统的三维模型,建立了深水连续管钻机的作业流程;给出了关键部件的设计参考并进行验证,以保证系统的安全性;并针对不同作业工况,基于ADAMS进行了起升系统的动力学仿真,分析了连续管钻机的运动特性及钢丝绳的受力,验证了起升系统的运动和动力学特性。设计的深水连续管钻机起升系统具有结构紧凑、连续起下的特点,相比传统钻机在深水浅层作业时更有优势,对后续深水钻机的研究具有实际意义和参考价值。

不同地层下钻机回转系统随载调速动态特性研究

由于钻进成井地层中岩石分布具有不确定性和随机性,导致钻机回转液压系统的动态特性复杂多变,若钻具的回转速度无法根据地层情况自动调节,将导致钻具出现“卡钻”和“偏斜”现象。以钻机回转液压系统为研究对象,对地下资源的地层分布情况进行研究,并计算出不同地层下适用的扭矩及转速;基于AMESim和Simulink构建钻机回转系统的机电液联合仿真模型;最后,研究系统在4类地层破岩作业时的动态特性及其对钻具转速的调控效果。结果表明:钻机回转系统的压力能够在0.01 s内由初始0上升至工作压力2.1 MPa,在负载扭矩突增时系统表现出良好的抗干扰能力和稳定性;此外,利用马达进出口压差来控制钻具转速的方法,其滞后性为0.5 s且误差值不超过5%,响应速度较快、控制精度较高。

Generating animatable 3D cartoon faces from single portraits

Background With the development of virtual reality(VR)technology,there is a growing need for customized 3D avatars.However,traditional methods for 3D avatar modeling are either time-consuming or fail to retain the similarity to the person being modeled.This study presents a novel framework for generating animatable 3D cartoon faces from a single portrait image.Methods First,we transferred an input real-world portrait to a stylized cartoon image using StyleGAN.We then proposed a two-stage reconstruction method to recover a 3D cartoon face with detailed texture.Our two-stage strategy initially performs coarse estimation based on template models and subsequently refines the model by nonrigid deformation under landmark supervision.Finally,we proposed a semantic-preserving face-rigging method based on manually created templates and deformation transfer.Conclusions Compared with prior arts,the qualitative and quantitative results show that our method achieves better accuracy,aesthetics,and similarity criteria.Furthermore,we demonstrated the capability of the proposed 3D model for real-time facial animation.

Rig-I基因表达下降对成熟B细胞株的影响

Rig-I是全反式维甲酸诱导NB4细胞分化过程的上调基因,可能与细胞分化有关。通过RNAi的方法,使一株B细胞株(1B4.B6.细胞株)的Rig-I下降,研究其下调后对该B细胞株的影响。结果表明Rig-I下调表达使1B4.B6.细胞株中的CD138单阳性细胞比例明显减少,B220单阳性和CD138+B220+双阳性细胞不同程度的升高,这可能与B细胞株分化成浆细胞有关,同时Rig-I下调使LPS刺激该细胞株产生IgG3的胚系转录本(germlinetranscript)的表达下调。提示Rig-I可能参与抗体类别转换。

加味五痹汤(肺痹)干预流感病毒感染诱导RIG-I/IFN-I信号通路作用机制研究

目的:观察加味五痹汤(肺痹)对流感病毒(IV)感染的BALB/c小鼠肺组织病理炎症及诱导RIG-I/IFN-I信号通路的作用机制。方法:SPF级BALB/c小鼠24只,随机分为正常组(A组)、模型组(B组)、加味五痹汤(肺痹)组(C组)、奥司他韦组(D组),除A组外,其余3组以IV FM1-6-E2滴鼻造模。于造模后第7天进行取材,镜下观察小鼠肺组织病理切片,采用qPCR法检测RIG-ImRNA的表达、ELISA法测定血清中IFN-α/β含量、Western-blot法检测NF-κB蛋白的表达。结果:IV感染后B组小鼠肺组织出现水肿、肺泡隔增厚与炎性细胞浸润,各治疗组肺部炎症有不同程度减轻。IV感染组小鼠肺组织内RIG-I的mRNA水平显著升高,与B组相比,C组RIG-I的mRNA表达量升高(P<0.05);感染组NF-κB蛋白表达增高,各治疗组可下调其表达;感染组血清中的IFN-α/β含量增高(P<0.05),治疗组能明显升高IFN-α/β含量(P<0.05),且C组与D组比较有差异性(P<0.05)。结论:加味五痹汤(肺痹)具有抗IV感染的作用,增加RIG-I和IFN-α/β含量及抑制NF-κB表达是其作用机制之一,且RIG-I/IFN-I可能是其信号通路的作用靶点。

基于随机森林的钻机泵控推进系统故障诊断方法

针对煤矿井下水平定向钻机恒压泵控推进系统故障复杂多变、监测变量繁多而导致的诊断效率低和诊断精度不高的问题,提出基于随机森林的钻机恒压泵控液压推进系统故障诊断方法。首先,采用AMESim软件建立钻机推进系统模型,结合系统常见故障模式和故障机理,在不同工况下通过改变液压元件关键参数完成了常见故障模拟;然后,用预处理后的仿真样本验证故障诊断模型的有效性。结果表明:随机森林(RF)故障诊断模型,可以实现钻机泵控推进系统故障的有效分类,与决策树(CART)、支持向量机(SVM)、十折交叉验证SVM(10-CV-SVM)相比有着更高的准确率,为定向钻机智能运维发展奠定了基础。

Analysis of wheel-rail adhesion redundancy considering the thirdbody medium on the rail surface

Purpose–In response to the problem of insufficient traction/braking adhesion force caused by the existence of the third-body medium on the rail surface,this study aims to analyze the utilization of wheel-rail adhesion coefficient under different medium conditions and propose relevant measures for reasonable and optimized utilization of adhesion to ensure the traction/braking performance and operation safety of trains.Design/methodology/approach–Based on the PLS-160 wheel-rail adhesion simulation test rig,the study investigates the variation patterns of maximum utilized adhesion characteristics on the rail surface under different conditions of small creepage and large slip.Through statistical analysis of multiple sets of experimental data,the statistical distribution patterns of maximum utilized adhesion on the rail surface are obtained,and a method for analyzing wheel-rail adhesion redundancy based on normal distribution is proposed.The study analyzes the utilization of traction/braking adhesion,as well as adhesion redundancy,for different medium under small creepage and large slip conditions.Based on these findings,relevant measures for the reasonable and optimized utilization of adhesion are derived.Findings–When the third-body medium exists on the rail surface,the train should adopt the low-level service braking to avoid the braking skidding by extending the braking distance.Compared with the current adhesion control strategy of small creepage,adopting appropriate strategies to control the train’s adhesion coefficient near the second peak point of the adhesion coefficient-slip ratio curve in large slip can effectively improve the traction/braking adhesion redundancy and the upper limit of adhesion utilization,thereby ensuring the traction/braking performance and operation safety of the train.Originality/value–Most existing studies focus on the wheel-rail adhesion coefficient values and variation patterns under different medium conditions,without considering whether the rail surface with different medium can provide sufficient traction/braking utilized adhesion coefficient for the train.Therefore,there is a risk of traction overspeeding/braking skidding.This study analyzes whether the rail surface with different medium can provide sufficient traction/braking utilized adhesion coefficient for the train and whether there is redundancy.Based on these findings,relevant measures for the reasonable and optimized utilization of adhesion are derived to further ensure operation safety of the train.

2023中国舞台影视灯光调研分析报告——灯光吊挂篇

本报告旨在深入调研2023年中国舞台吊挂企业发展新动向,了解企业最新产品的研发以及灯光吊挂及控制方面的新理念及应用,以便为行业内从业人员和相关机构提供有价值的参考和指导。内容涵盖了吊挂多功能化的应用,控制系统新发展趋势,新产品的技术创新与运用等相关内容。

伸缩式自动化井口上卸扣装置的设计与分析

随着修井作业朝着自动化方向发展,国内外均致力于研究自动化修井作业设备。文章结合自动化修井机特点,设计出一种伸缩式自动化井口上卸扣装置,分析了自动液压钳、扶正对中装置等主要结构,系统阐述了该装置的工作原理,计算得出液压钳钳牙与油管之间的防打滑条件,对背钳夹紧液压缸进行选型计算,设计出合适的自动液压钳以及整个装置的液压回路,保证该装置在工作时的安全性与稳定性。现场试验结果表明,伸缩式自动化井口上卸扣装置能够实现精准对中,快速平稳完成上卸扣作业,大大减轻了工人的工作强度,节省井口操作平台空间,提升工作效率,并提高了工人的安全性。