期刊文献+
共找到54篇文章
< 1 2 3 >
每页显示 20 50 100
Simulation Based Energy-resource Efficient Manufacturing Integrated with In-process Virtual Management 被引量:2
1
作者 KATCHASUWANMANEE Kanet CHENG Kai BATEMAN Richard 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第6期1083-1089,共7页
As energy efficiency is one of the key essentials towards sustainability, the development of an energy-resource efficient manufacturing system is among the great challenges facing the current industry. Meanwhile, the ... As energy efficiency is one of the key essentials towards sustainability, the development of an energy-resource efficient manufacturing system is among the great challenges facing the current industry. Meanwhile, the availability of advanced technological innovation has created more complex manufacturing systems that involve a large variety of processes and machines serving different functions. To extend the limited knowledge on energy-efficient scheduling, the research presented in this paper attempts to model the production schedule at an operation process by considering the balance of energy consumption reduction in production, production work flow (productivity) and quality. An innovative systematic approach to manufacturing energy-resource efficiency is proposed with the virtual simulation as a predictive modelling enabler, which provides real-time manufacturing monitoring, virtual displays and decision-makings and consequentially an analytical and multidimensional correlation analysis on interdependent relationships among energy consumption, work flow and quality errors. The regression analysis results demonstrate positive relationships between the work flow and quality errors and the work flow and energy consumption. When production scheduling is controlled through optimization of work flow, quality errors and overall energy consumption, the energy-resource efficiency can be achieved in the production. Together, this proposed multidimensional modelling and analysis approach provides optimal conditions for the production scheduling at the manufacturing system by taking account of production quality, energy consumption and resource efficiency, which can lead to the key competitive advantages and sustainability of the system operations in the industry. 展开更多
关键词 energy-resource efficient manufacturing virtual manufacturing manufacturing simulation in-process virtual management
下载PDF
EXPERIMENTAL STUDY ON IN-PROCESS MONITORING OF CUTTING CHATTER
2
作者 Jiang Chengyu, Xu Hongjun, Zhang Youzhen and Pu XuefengNanjing Aeronautical Institute 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1990年第3期216-223,共8页
The most significant characteristic in frequency domain during cutting chatter occurring process is the steep rise of the vibration energy in certain narrow frequency band containing the chatter frequency. In accordan... The most significant characteristic in frequency domain during cutting chatter occurring process is the steep rise of the vibration energy in certain narrow frequency band containing the chatter frequency. In accordance with the frequency band-energy principle, a reliable criterion for chatter judgement is proposed and the in-process detection of cutting chatter is realized by the use of microcomputer. This method has the advantages of rapidity, high sensitivity, accuracy and high resistance to interference. Some concrete measures taken in practical applications are also discussed. 展开更多
关键词 TING EXPERIMENTAL STUDY ON in-process MONITORING OF CUTTING CHATTER BPF mode FH
下载PDF
A cleaner production strategy for acid mine drainage prevention of waste rock:A porphyry copper case
3
作者 Yesica L.Botero Isabelle Demers +2 位作者 Luis A.Cisternas ArnoldoÁvila Mostafa Benzaazoua 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第8期1163-1177,共15页
An in-process technology approach is proposed to identify the source of acid mine drainage(AMD)generation and prevent its formation in a porphyry copper waste rock(WR).Adopting actions before stockpiling the WR enable... An in-process technology approach is proposed to identify the source of acid mine drainage(AMD)generation and prevent its formation in a porphyry copper waste rock(WR).Adopting actions before stockpiling the WR enables the establishment of potential contaminants and predicts the more convenient method for AMD prevention.A WR sample was separated into size fractions,and the WR’s net acidgenerating potential was quantified using chemical and mineralogical characterization.The diameter of physical locking of sulfides(DPLS)was determined,and the fractions below the DPLS were desulfurized using flotation.Finally,the WR fractions and tailing from the flotation test were submitted to acid-base accounting and weathering tests to evaluate their acid-generating potential.Results show that the WR’s main sulfide mineral is pyrite,and the DPLS was defined as 850μm.A sulfide recovery of 91%was achieved using a combination of HydroFloat^(®)and Denver cells for a size fraction lower than DPLS.No grinding was conducted.The results show that size fractions greater than DPLS and the desulfurized WR are unlikely to produce AMD.The outcomes show that in-processing technology can be a more proactive approach and an effective tool for avoiding AMD in a porphyry copper WR. 展开更多
关键词 Waste rock Porphyry copper ore DESULFURIZATION Acid mine drainage HydroFloat^(®) in-process technology Cleaner production
下载PDF
不同情形下GNSS/INS组合导航系统精度分析
4
作者 吴庆 刘长建 +2 位作者 肖国锐 胡小华 李崇辉 《测绘科学技术学报》 2024年第4期348-354,共7页
基于载波相位差分的GNSS/INS组合导航系统在移动测绘领域应用广泛,但其精度也由于卫星观测条件、IMU级别、滤波算法和处理软件等因素而相差较大,对测绘作业和成果精度评定造成阻碍。针对上述问题,利用设计的跑车实验,详细分析了不同软... 基于载波相位差分的GNSS/INS组合导航系统在移动测绘领域应用广泛,但其精度也由于卫星观测条件、IMU级别、滤波算法和处理软件等因素而相差较大,对测绘作业和成果精度评定造成阻碍。针对上述问题,利用设计的跑车实验,详细分析了不同软件、不同级别IMU、不同处理模式、不同环境等条件下组合导航参数的精度。结果表明,在卫星观测条件良好的情况下,不同软件和不同处理模式的解算精度相当;由消费级到战术级再到近导航级,精度逐渐提高,其中消费级IMU组合导航的姿态中的航向精度为660″、横滚和俯仰精度为60″、速度精度为2.5 cm/s、3D位置精度为3 cm。在城市路段,精度整体上均有下降但仍在同一量级;当卫星数不足4颗时,紧组合定位精度会下降到m级。 展开更多
关键词 全球导航卫星系统 惯性导航系统 处理软件 IMU级别 处理模式 精度分析
下载PDF
In-process monitoring in laser grooving with line-shaped femtosecond pulses using optical coherence tomography 被引量:1
5
作者 Satoshi Hasegawa Masatoshi Fujimoto +1 位作者 Toshihisa Atsumi Yoshio Hayasaki 《Light(Advanced Manufacturing)》 2022年第3期150-159,共10页
A line-shaped beam is useful for increasing the processing speed in laser grooving and scribing.In laser grooving,depth control of the processed structure is important for performing precise processing.In this paper,i... A line-shaped beam is useful for increasing the processing speed in laser grooving and scribing.In laser grooving,depth control of the processed structure is important for performing precise processing.In this paper,in-process monitoring of the depth of a structure formed by femtosecond laser processing with a line-shaped beam using swept-source optical coherence tomography(SS-OCT)was demonstrated.In the evaluation of the SS-OCT system,the depth resolution,measurement accuracy,and axial measurable range were 15.8μm,±2.5μm and 5.3 mm,respectively.In laser grooving,the structural shape and the distribution of deposited debris were successfully monitored.The measured depth agreed well with the depth obtained using a laser confocal microscope.The proposed method will be effective for precise laser processing with feedback control of the laser parameters based on in-process monitoring of the processed structure. 展开更多
关键词 Optical coherence tomography Computer-generated hologram Femtosecond laser processing in-process monitoring
原文传递
In-Process Diameter Measurement Technique for Micro-Optical Fiber with Standing Wave Illumination 被引量:1
6
作者 Masaki Michihata Zhao Zheng +3 位作者 Daiki Funaiwa Sojiro Murakami Shotaro Kadoya Satoru Takahashi 《Nanomanufacturing and Metrology》 2021年第1期28-36,共9页
In this paper,we propose an in-process measurement method of the diameter of micro-optical fiber such as a tapered optical fiber.The proposed technique is based on analyzing optically scattered light generated by stan... In this paper,we propose an in-process measurement method of the diameter of micro-optical fiber such as a tapered optical fiber.The proposed technique is based on analyzing optically scattered light generated by standing wave illumination.The proposed method is significant in that it requires an only limited measurement range and does not require a high dynamic range sensor.These properties are suitable for in-process measurement.This experiment verified that the proposed method could measure a fiber diameter as stable as±0.01μm under an air turbulence environment.As a result of comparing the measured diameter distribution with those by scanning electron microscopy,it was confirmed that the proposed method has a measurement accuracy better than several hundred nanometers. 展开更多
关键词 Micro-fiber in-process measurement Mi scattering theory Standing wave DIAMETER
原文传递
IMPULP:A Hardware Approach for In-Process Memory Protection via User-Level Partitioning
7
作者 Yang-Yang Zhao Ming-Yu Chen +4 位作者 Yu-Hang Liu Zong-Hao Yang Xiao-Jing Zhu Zong-Hui Hong Yun-Ge Guo 《Journal of Computer Science & Technology》 SCIE EI CSCD 2020年第2期418-432,共15页
In recent years many security attacks occur when malicious codes abuse in-process memory resources.Due to the increasing complexity,an application program may call third-party code which cannot be controlled by progra... In recent years many security attacks occur when malicious codes abuse in-process memory resources.Due to the increasing complexity,an application program may call third-party code which cannot be controlled by programmers but may contain security vulnerabilities.As a result,the users have the risk of suffering information leakage and control flow hijacking.However,current solutions like Intel memory protection extensions(MPX)severely degrade performance,while other approaches like Intel memory protection keys(MPK)lack flexibility in dividing security domains.In this paper,we propose IMPULP,an effective and efficient hardware approach for in-process memory protection.The rationale of IMPULP is user-level partitioning that user code segments are divided into different security domains according to their instruction addresses,and accessible memory spaces are specified dynamically for each domain via a set of boundary registers.Each instruction related to memory access will be checked according to its security domain and the corresponding boundaries,and illegal in-process memory access of untrusted code segments will be prevented.IMPULP can be leveraged to prevent a wide range of in-process memory abuse attacks,such as buffer overflows and memory leakages.For verification,an FPGA prototype based on RISC-V instruction set architecture has been developed.We present eight tests to verify the effectiveness of IMPULP,including five memory protection function tests,a test to defense typical buffer overflow,a test to defense famous memory leakage attack named Heartbleed,and a test for security benchmark.We execute the SPEC CPU2006 benchmark programs to evaluate the efficiency of IMPULP.The performance overhead of IMPULP is less than 0.2%runtime on average,which is negligible.Moreover,the resource overhead is less than 5.5%for hardware modification of IMPULP. 展开更多
关键词 in-process isolation memory protection out-of-bounds user-level partitioning
原文传递
基于SHO-SVM的火法炼铜工艺风险评估研究
8
作者 王振 《化工管理》 2024年第19期68-70,共3页
为准确判断火法炼铜工艺风险等级,文章提出了一种精准有效的风险评估模型。基于火法炼铜工艺按功能区段筛选出人员、环境、设备、管理四方面的20项风险指标因素,利用斑点鬣狗优化算法(SHO)寻优支持向量机(SVM)的正则因数与核参数,建立SH... 为准确判断火法炼铜工艺风险等级,文章提出了一种精准有效的风险评估模型。基于火法炼铜工艺按功能区段筛选出人员、环境、设备、管理四方面的20项风险指标因素,利用斑点鬣狗优化算法(SHO)寻优支持向量机(SVM)的正则因数与核参数,建立SHO-SVM风险评估模型。结果表明,该模型正确分类了21组数据的风险等级,判别准确率为87.5%,在各项性能指标上均优于对照模型,表明其对电火法炼铜工艺风险评估等级具备高识别精度。 展开更多
关键词 火法炼铜工艺 斑点鬣狗优化算法 支持向量机 风险评估
下载PDF
煤焦化粗苯生产精苯预处理工序的工艺改进
9
作者 胡宁 《化工管理》 2024年第2期145-147,共3页
煤焦化粗苯是一种重要的工业原料。精苯是煤焦化粗苯的高纯度产品,具有更高的纯度和质量要求,因此具有更广泛的应用领域。精苯的生产影响着相关产业的发展和竞争力。预处理工序在煤焦化粗苯生产精苯过程中起着至关重要的作用。它的主要... 煤焦化粗苯是一种重要的工业原料。精苯是煤焦化粗苯的高纯度产品,具有更高的纯度和质量要求,因此具有更广泛的应用领域。精苯的生产影响着相关产业的发展和竞争力。预处理工序在煤焦化粗苯生产精苯过程中起着至关重要的作用。它的主要目标是去除煤焦化粗苯中的杂质、杂质物质和不纯物质,提高产物的纯度和品质。预处理工序通常包括脱硫、脱碳、脱氮等操作,以及液相催化反应等。通过改进煤焦化粗苯生产精苯的预处理工艺,可以实现更高质量、更高效率和更环保的生产,提高企业的竞争力和可持续发展能力。 展开更多
关键词 煤焦化粗苯 精苯 预处理 工艺改进
下载PDF
基于智能化的精细化工全流程自动化实现路径研究
10
作者 张鑫媛 《化工管理》 2024年第29期24-27,共4页
随着中国步入新时代的发展轨道,化工行业的生产效率和生产质量面临着前所未有的挑战和机遇。为了顺应时代发展需求,化工行业亟待进行深层次的改革,通过技术创新和智能化升级,提高化工流程的精细化和高质量化水平。在智能化背景下,精细... 随着中国步入新时代的发展轨道,化工行业的生产效率和生产质量面临着前所未有的挑战和机遇。为了顺应时代发展需求,化工行业亟待进行深层次的改革,通过技术创新和智能化升级,提高化工流程的精细化和高质量化水平。在智能化背景下,精细化工全流程自动化推进过程中还存在一些问题,尽管自动化技术在化工行业的应用已取得显著成效,但产品质量仍有较大的提升空间,产品结构布局尚待优化,自动化体系仍需进一步完善。基于此,文章分析了当前化工行业的发展现状,并结合智能化技术的最新进展,提出了精细化工全流程自动化建设的具体实现路径。 展开更多
关键词 精细化工 智能化 全流程自动化 化工行业
下载PDF
CONSTRUCTION OF SIMULATION SYSTEM AND ITS IMPLEMENTATION FOR JOB DISPATCH OF INPROCESS WAREHOUSE ON FLEXIBLE PRODUCTION LINE 被引量:1
11
作者 吴清一 董平 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 1996年第1期35+31-35,共6页
The constructing method of a simulation system is discussed in this paper. It is for a Decision Support System (DSS) of main in-process warehouse on a large scale flexible production line. This system is decomposed in... The constructing method of a simulation system is discussed in this paper. It is for a Decision Support System (DSS) of main in-process warehouse on a large scale flexible production line. This system is decomposed into three function blocks: DSS, support environment for simulation, simulating dispatch module. It has a fine structure and works coordinatively to complete whatever assignment for simulation tasks of a complicated production system. 展开更多
关键词 LOGISTICS in-process warehouse DSS simulation system
下载PDF
基于正逆向与降噪的捷联惯导改进快速对准方法(英文) 被引量:7
12
作者 覃方君 李安 许江宁 《中国惯性技术学报》 EI CSCD 北大核心 2014年第4期453-458,共6页
针对捷联惯性导航系统(INS)的快速对准问题,基于双向过程和惯性传感器的降噪方法,提出了一种改进的对准方法。利用双向过程(前向和逆向)反复处理保存的惯性测量单元(IMU)的数据序列实现快速对准,推导了一种新的前向与逆向对准关系。为... 针对捷联惯性导航系统(INS)的快速对准问题,基于双向过程和惯性传感器的降噪方法,提出了一种改进的对准方法。利用双向过程(前向和逆向)反复处理保存的惯性测量单元(IMU)的数据序列实现快速对准,推导了一种新的前向与逆向对准关系。为了减少角随机游走误差的影响,基于小波变换的降噪方法抑制光纤陀螺(FOGs)和加速度计噪声,给出陀螺罗经回路的改进方法的整个流程,并在自研的光纤陀螺捷联惯导系统上进行测试。实测数据实验结果表明,经正逆向与降噪改进后的快速对准方法具有更快的收敛速度,能在不到3 min内完成对准任务,同时也具有更好的对准精度。 展开更多
关键词 捷联 惯导 对准 双向过程 降噪
下载PDF
Sludge concentration dynamic distribution and its impact on the performance of UNITANK 被引量:9
13
作者 ZHANG Fa-gen LIU Jun-xin SUI Jun 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第2期141-147,共7页
UNITANK is a biological wastewater treatment process that combines the advantages of traditional activated sludge process and sequencing batch reactor, which is divided into Tank A, B and C. In this study, the sludge ... UNITANK is a biological wastewater treatment process that combines the advantages of traditional activated sludge process and sequencing batch reactor, which is divided into Tank A, B and C. In this study, the sludge distribution and its impact on performance of UNITANK were carried out in Liede Wastewater Plant (WWTP) of Guangzhou, China. Results showed that there was a strong affiliation between Tank A and B of the system in sludge concentration distribution. The initial sludge concentration in Tank A could present the sludge distribution of the whole system. The sludge distribution was mainly influenced by hydraulic condition. Unsteady sludge distribution had an impact on variations of substrates in reactors, especially in decisive reactor, and this could lead to failure of system. Settler could partially remove substrates such as COD and NO3-N, but there was adventure of sludge deterioration. The rational initial sludge concentration in Tank A should be 4000-6000 mg/L MLSS. 展开更多
关键词 UNITANK sludge concentration dynamic distribution in-process study
下载PDF
电化学方法处理含硫废水的过程和特性 被引量:4
14
作者 张克强 季民 张建顺 《农业环境科学学报》 CAS CSCD 北大核心 2003年第1期90-92,共3页
采用管式电气浮装置处理人工模拟含硫废水并研究其过程和特性,探讨在两相厌氧处理富含硫酸盐高浓度有机废水工艺中采用电化学方法处理含硫废水的可行性。
关键词 电化学方法 含硫废水 废水处理 两相厌氧处理 管式电气浮装置
下载PDF
Component modification of steel slag in air quenching process to improve grindability 被引量:4
15
作者 宗燕兵 苍大强 +2 位作者 甄云璞 李宇 白皓 《中国有色金属学会会刊:英文版》 CSCD 2009年第S3期834-839,共6页
A new solution called component modification in-process was introduced to the difficult grinding of air quenching steel slag by a series of experiments. The results show that the fly ash added into the molten steel sl... A new solution called component modification in-process was introduced to the difficult grinding of air quenching steel slag by a series of experiments. The results show that the fly ash added into the molten steel slag before air quenching can more effectively improve the slag's grindability than milltailings, which is the other modification agent tested under the same conditions. The role of fly ash is strengthened as its proportion increases, although the degree of promotion is gradually reduced. As a result of the reaction between fly ash and steel slag at high temperature, some new mineral phases and vitreous bodies with fine grindability promote the slag grinding easily. This work is helpful to making a comprehensive utilization of steel slag and maximize its economic efficiency in China. 展开更多
关键词 steel SLAG component MODIFICATION in-process AIR QUENCHING GRINDABILITY PARTICLE distribution
下载PDF
点火位置对汽油转子发动机燃烧过程的影响 被引量:5
16
作者 潘剑锋 黄明财 +3 位作者 范宝伟 潘振华 胡翔 陆尧 《车用发动机》 北大核心 2017年第1期59-64,共6页
以点燃式汽油转子发动机为研究对象,建立了相应的湍流和燃烧模型,实现了发动机工作过程的三维动态模拟,并利用试验结果进行对比验证。在此模型基础上,模拟计算和分析了4种不同点火位置对缸内压力、温度、火焰传播及NO_x生成的影响。结... 以点燃式汽油转子发动机为研究对象,建立了相应的湍流和燃烧模型,实现了发动机工作过程的三维动态模拟,并利用试验结果进行对比验证。在此模型基础上,模拟计算和分析了4种不同点火位置对缸内压力、温度、火焰传播及NO_x生成的影响。结果表明:点火位置选择在燃烧室中轴线上,与转子凹坑中心位置重合,能优化燃烧,获取较大的功率;在燃烧室后部点火时,燃烧初期火焰传播速度快,压力升高率大,但是受限于燃烧室后部燃料少,压力峰值不高,且NO_x的生成量偏高;在燃烧室前部点火时,在补燃期阶段燃烧速度最快,但是点燃后压力升高阶段的燃烧效率一般;点火位置位于燃烧中轴线两侧错位排布时,燃烧效率低下导致压力峰值最低,同时NO_x的生成量稍高;一定工况下,双点火位置的坐标分别为(10 mm,-56 mm,-37.2 mm)和(-10 mm,-56 mm,-37.2mm)时,该发动机能获得最大的功率且NO_x生成量较少。 展开更多
关键词 汽油 转子发动机 燃烧过程 仿真 点火位置
下载PDF
Imaging protein crystal growth behaviour in batch cooling crystallisation 被引量:3
17
作者 Jing J.Liu Cai Y.Ma Xue Z.Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第1期101-108,共8页
The temporal and spatial growth behaviour of protein crystals, subject to different cooling strategies in protein crystallisation was investigated. Although the impact of temperature and cooling rate on crystal growth... The temporal and spatial growth behaviour of protein crystals, subject to different cooling strategies in protein crystallisation was investigated. Although the impact of temperature and cooling rate on crystal growth of small molecules was well documented, much less has been reported on their impact on the crystallisation of proteins. In this paper, an experimental set-up is configured to carry out such a study which involves an automatic temperature controlled hot-stage crystalliser fitted with a real-time imaging system. Linbro parallel crystallisation experiments(24-well plate) were also conducted to find the suitable initial conditions to be used in the hot-stage crystallisation experiments, including the initial concentration of HEW lysozyme solutions, precipitate concentration and pH value. It was observed that fast cooling rates at the early stage led to precipitates while slow cooling rates produced crystal nuclei, and very slow cooling rates, much smaller than for small molecules are critical to the growth of the nuclei and the crystals to a desired shape. The interesting results provide valuable insight as well as experimental proof of the feasibility and effectiveness of cooling as a means for achieving controlled protein crystallisation, compared with the evaporation approach which was widely used to grow single large crystals for X-ray diffraction study. Since cooling rate control can be easily achieved and has good repeatability, it suggests that large-scale production of protein crystals can be effectively achieved by manipulating cooling rates. 展开更多
关键词 Hot-stage reactor On-line imaging of crystal growth Hen-Egg-White lysozyme cooling crystallisation Protein crystallisation Real-time in-process imaging
下载PDF
A New Characterization Approach of Weld Nugget Growth by Real-Time Input Electrical Impedance 被引量:2
18
作者 Yoke-Rung Wong Xin Pang 《Engineering(科研)》 2014年第9期516-525,共10页
The in-process changes of weld nugget growth during the Resistance Spot Welding were investigated based on the resistance of input electrical impedance. To compute the time varying resistance of input electrical imped... The in-process changes of weld nugget growth during the Resistance Spot Welding were investigated based on the resistance of input electrical impedance. To compute the time varying resistance of input electrical impedance, the welding voltage and current signals are measured simultaneously and then converted into complex-valued signals by using Hilbert transform. Comparing with the dynamic contact resistance as reported in literature, it showed that the time varying resistance of input electrical impedance can be accurately correlated with the physical changes of weld nugget growth. Therefore, it can be used to characterize the in-process changes of weld nugget growth. Several new findings were reported based on the investigation of spot welds under no weld, with and without weld expulsion conditions. 展开更多
关键词 in-process INPUT Electrical IMPEDANCE Dynamic Contact Resistance WELD NUGGET HILBERT Transform
下载PDF
降阶扩展卡尔曼滤波在INS/GPS导航系统中的应用 被引量:2
19
作者 徐金华 许江宁 +1 位作者 朱涛 边少锋 《兵工学报》 EI CAS CSCD 北大核心 2006年第4期659-664,共6页
INS/GPS组合可以实现长期稳定、高精度的导航系统,从而替代单一高精度高成本的INS.组合中等精度的INS和MS860系统,应用降阶EKF方法,开发实现“真航向测量系统”(TNDS)的高精度航姿测量。TNDS以PC/104架构的嵌入式计算机采集处理来自INS... INS/GPS组合可以实现长期稳定、高精度的导航系统,从而替代单一高精度高成本的INS.组合中等精度的INS和MS860系统,应用降阶EKF方法,开发实现“真航向测量系统”(TNDS)的高精度航姿测量。TNDS以PC/104架构的嵌入式计算机采集处理来自INS和MS860的信息;重点推导了TNDS降阶误差模型,并在其中采用降阶的EKF滤波,TNDS系统最后进行了海上试验。试验数据表明:采用降阶EKF滤波后,INS的位置误差σ由100 m减小到40 m;系统航向的误差由原来的0.105°减小到0.034°;纵横摇的误差也相应地减小。整个海上试验验证了TNDS的性能和降阶EKF滤波算法的有效性。 展开更多
关键词 信息处理技术 全球定位系统 惯性导航系统 组合导航 误差模型 降阶扩展卡尔曼滤波
下载PDF
谐波减速器柔轮冷滚工艺及残余应力数值模拟 被引量:3
20
作者 吴上生 喻钟鸣 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2017年第2期52-58,共7页
针对柔轮工作性能的特殊要求,分析并优化了传统柔轮冷滚压工艺模型,柔轮采用双圆弧齿廓曲线模型;依据修正的Johnson-Cook本构模型建立柔轮冷滚压成形有限元模型并加以验证。仿真结果表明,采用该模型能得到清晰的双圆弧齿形和较均匀的等... 针对柔轮工作性能的特殊要求,分析并优化了传统柔轮冷滚压工艺模型,柔轮采用双圆弧齿廓曲线模型;依据修正的Johnson-Cook本构模型建立柔轮冷滚压成形有限元模型并加以验证。仿真结果表明,采用该模型能得到清晰的双圆弧齿形和较均匀的等效应变分布。文中还分析了不同工艺参数(进给速度、滚轮转速及摩擦系数)对柔轮轮齿表面残余应力的影响,结果表明:增大进给速度会降低轮齿表面的残余应力最大值,过大的进给速度会造成"凸起";适当降低滚轮转速和进给速度,可提高残余应力分布的均匀性;摩擦系数与残余压应力分布深度正相关. 展开更多
关键词 柔轮 冷滚压工艺模型 数值模拟 残余应力 工艺参数
下载PDF
上一页 1 2 3 下一页 到第
使用帮助 返回顶部