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Lightweight design and static strength analysis of battery box for electric vehicle 电动汽车电池箱轻量化设计及静强度分析
Lingli Chen, Xiaoyu Zhao
In this paper, the lightweight design and static strength analysis of electric vehicle battery box were replaced by composite materials instead of traditional metal materials. Firstly, the finite element model of the battery box was established by using ABAQUS. The battery box was geometrically cleaned, the composite material of the box structure and the foam material of the battery module were defined, and the grid was divided according to the process of finite element analysis. Then, based on the actual application, the boundary conditions were set and the load was applied to solve the problem. Finally, the stress and failure factor of the composite battery box under the sudden braking and sharp turn of the bumpy road were analyzed, and the strength of the battery box was checked. The results show that under the two combined conditions, the maximum stress of the battery box is less than the specified stress of the composite material, and the failure factor is much less than 1, meeting the strength requirements of the battery box.
本文采用复合材料代替传统金属材料,对电动汽车电池箱进行轻量化设计和静强度分析。首先,利用ABAQUS软件建立了电池箱的有限元模型。对电池箱体进行几何清洗,定义箱体结构复合材料和电池模块泡沫材料,并根据有限元分析过程划分网格。然后,根据实际应用,设置边界条件,施加载荷求解问题。最后,分析了复合材料电池箱在颠簸路面急刹车急转弯下的应力和失效因素,并对电池箱进行了强度校核。结果表明,在两种组合条件下,电池箱的最大应力小于复合材料的规定应力,失效系数远小于1,满足电池箱的强度要求。
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引用次数: 1
Analysis of Multi-mode Inertial Mechanism of Automotive Door Lock Based on ADAMS 基于ADAMS的汽车门锁多模惯性机构分析
Xiaojie Huang, Lubin Hang, Mingyuan Wang, Xiaobo Huang, Qiansheng Wang, Zhe Liu, Yong Chen, Yong Hua, Jinliang Du
An inertial protection mechanism embedded in the vehicle door latch is analyzed to avoid door's accidental open when the vehicle is hit from the side. The structural design principle of the inertial protection mechanism and its two different configuration in two working modes are analyzed through the mechanism sketch. The switching process of the mechanism between two modes is studied during the vehicle collision. A simulated vehicle detection standard is used as an initial condition for dynamic simulation of the inertial protection mechanism. The simulation results show that the inertial protection mechanism can be switched to the inertia protection mode in 0.2ms, The mechanism ensures the safety of the passengers inside the vehicle by overcoming the risk of the side door accidentally open when the vehicle is hit by the side.
分析了一种嵌入车门插销的惯性保护机构,以避免车辆被侧面撞击时车门意外打开。通过机构示意图分析了惯性保护机构的结构设计原理及其在两种工作模式下的两种不同配置。研究了车辆碰撞过程中机构在两种模式之间的切换过程。采用模拟车辆检测标准作为惯性保护机构动态仿真的初始条件。仿真结果表明,惯性保护机构可在0.2ms内切换到惯性保护模式,克服了车辆被侧面撞击时侧门不小心打开的风险,保证了车内乘客的安全。
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引用次数: 2
Improvement of surface temperature control system based on fuzzy adaptive PID algorithm 基于模糊自适应PID算法的表面温度控制系统改进
Luhao Ge, Bo Liu, Tao Wang
The thermostatic control system of traditional dough mixer has weak adaptive ability and large overshoot. In order to improve the self-adjusting ability of the constant temperature control system of the dough mixer, we have carried out many experimental analyses and finally come to the conclusion that the fuzzy self-adaptive PID algorithm can effectively improve the constant temperature system of the dough mixer. Traditional PID algorithm is composed of proportional unit P, integral unit I and differential unit D. Once the parameters P, I and D are established, they cannot be changed. Therefore, this algorithm has a weak adaptive ability and cannot be changed according to the environment. The fuzzy adaptive PID algorithm used in this paper refers to the input error e(t) and error change rate ec(t). Fuzzy reasoning is carried out by using fuzzy rules, and the fuzzy matrix table is consulted to meet the adaptive adjustment of PID parameters at different times, so as to achieve the adaptive PID algorithm. For the temperature control system of dough mixer, PID algorithm and fuzzy adaptive PID algorithm are used to construct the constant temperature system respectively. Based on the specific environment of the dough mixer, after three times of comparative experimental analysis, the final conclusion is that the fuzzy self-adaptive PID algorithm overshoot is small, which can reach the stable range faster, and the accuracy is improved by 0.6% compared with the traditional PID algorithm.
传统的和面机恒温控制系统自适应能力弱,超调量大。为了提高和面机恒温控制系统的自调节能力,我们进行了大量的实验分析,最终得出模糊自适应PID算法可以有效改善和面机恒温系统的结论。传统的PID算法由比例单位P、积分单位I和微分单位D组成。参数P、I和D一旦确定,就不能改变。因此,该算法的自适应能力较弱,不能根据环境进行改变。本文采用的模糊自适应PID算法是指输入误差e(t)和误差变化率ec(t)。利用模糊规则进行模糊推理,并参考模糊矩阵表满足不同时刻PID参数的自适应调整,从而实现自适应PID算法。对于和面机的温度控制系统,分别采用PID算法和模糊自适应PID算法构建恒温系统。基于和面机的具体环境,经过三次对比实验分析,最终得出的结论是模糊自适应PID算法超调量小,可以更快地达到稳定范围,精度比传统PID算法提高0.6%。
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引用次数: 3
An improved motion pedestrian tracking algorithm based on CamShift 一种基于CamShift的改进运动行人跟踪算法
Chao Zou, G. Yang
Target detection, recognition and tracking are particularly important in intelligent driving. With the development of artificial neural network research, the recognition and tracking algorithm based on neural network has been greatly improved in recognition speed and accuracy. But its performance depends greatly on the training database, and the amount of calculation is too large to meet the real-time requirements. The tracker based on correlation filtering is fast, but it will lose the target once the target is slightly occluded. In this paper, we proposed an improved algorithm based on CamShift and Kalman filter. Through the prediction function of Kalman filter, reduce the range of search window of CamShift. Then the target information obtained by CamShift algorithm is fed back to Kalman filter for updating and correction. The optimization algorithm not only satisfies the real-time requirement of video target tracking, but also improves the tracking accuracy even if the target is overshadowed.
目标检测、识别和跟踪在智能驾驶中尤为重要。随着人工神经网络研究的发展,基于神经网络的识别跟踪算法在识别速度和精度上都有了很大的提高。但其性能很大程度上依赖于训练库,且计算量过大,无法满足实时性要求。基于相关滤波的跟踪器速度快,但一旦目标被轻微遮挡就会失去目标。本文提出了一种基于CamShift和卡尔曼滤波的改进算法。通过卡尔曼滤波的预测函数,减小CamShift的搜索窗口范围。然后将CamShift算法得到的目标信息反馈给卡尔曼滤波进行更新和校正。该优化算法不仅满足了视频目标跟踪的实时性要求,而且在目标被遮挡的情况下也提高了跟踪精度。
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引用次数: 1
Application of AHP for Liquefaction Risk Assessment of Bulk Mineral Ores during Marine Transportation 层次分析法在散装矿石海上运输液化风险评估中的应用
Haitao Wang, Qiwei Jian, Xinbo Xie
Bulk mineral ores are susceptible to liquefaction when being shipped in ocean bulk carriers. The liquefaction may occur suddenly and cause a dangerous list or even capsize of the vessel. In order to evaluate the liquefaction potential of the mineral ores during ocean shipping, this paper established a liquefaction risk assessment model for mineral ores through Analytical Hierarchy Process (AHP). An evaluation index system of liquefaction risk was constructed into an orderly hierarchical structure. Three crucial factors including vibration acceleration, moisture content and fine particles, were pairwise compared during the process. The order of the priority weight for the factors was moisture content (0.5834) > vibration acceleration (0.333) > fine particles content (0.0833). The risk value and value range of each factor were assigned on a five-point scale. Consequently, the overall value of the liquefaction risk was computed and the corresponding likelihood of liquefaction occurrence was assessed and validated. The liquefaction risk assessment model of bulk mineral ores was reasonable, which could provide useful information to avoid liquefaction of bulk mineral ores.
散装矿石在海洋散货船上运输时容易液化。液化可能突然发生,造成危险的倾斜甚至倾覆。为了评价海洋运输过程中矿石的液化潜力,运用层次分析法建立了矿石液化风险评价模型。将液化风险评价指标体系构建为有序的层次结构。在此过程中,对振动加速度、含水率和细颗粒三个关键因素进行了两两比较。各因素的优先权重依次为含水率(0.5834)、振动加速度(0.333)、细粒含量(0.0833)。每个因素的风险值和值范围按五分制进行分配。因此,计算了液化风险的总体值,并对相应的液化发生可能性进行了评估和验证。所建立的散装矿石液化风险评估模型是合理的,为避免散装矿石液化提供了有用的信息。
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引用次数: 0
Kinematic Performance Analyses of a Symmetrical 4-URU Parallel Mechanism 对称4-URU并联机构的运动性能分析
Qiangqiang Zhang, Yong-xiu Xu, Fei Dong, Yan Wang
After verifying the degrees of freedom (DOF) of the symmetrical 4-URU parallel mechanism based on the screw theory, the forward and inverse position models of the mechanism are solved. The workspace is then obtained by the boundary search algorithm. The singularity of the mechanism is solved. The above analyses and results can provide references for mechanism mechanics analysis, structure design and prototype development.
基于螺旋理论对对称4-URU并联机构的自由度进行验证后,求解了该机构的正、逆位置模型。然后通过边界搜索算法获得工作空间。解决了机构的奇异性问题。以上分析结果可为机构力学分析、结构设计和样机研制提供参考。
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引用次数: 0
Five-axis CNC machine tool contour error control method 五轴数控机床轮廓误差控制方法
Le Yang, Liqiang Zhang, Dongdong Li
In the five-axis CNC machining, various errors caused by factors such as geometrical accuracy and dynamic characteristics of the machine tool will eventually appear as the contour error of the part. Therefore, controlling and compensating for contour errors is of great significance. This paper applies the D-H method in robot kinematics to the error modeling of CNC machine tools, and this paper takes the double turntable five-axis machine tool as the research object. In this paper, by establishing a kinematics positive solution model, the law of the contour error of the tool tip and the contour error of the tool orientation are revealed, which provides a theoretical basis for the contour error compensation control. Based on this, a contour error compensation control method is designed. Simulation experiments show that the control method can effectively reduce the contour error.
在五轴数控加工中,由机床的几何精度和动态特性等因素引起的各种误差最终都会以零件的轮廓误差的形式出现。因此,控制和补偿轮廓误差具有重要意义。本文将机器人运动学中的D-H方法应用于数控机床的误差建模,并以双转台五轴机床为研究对象。本文通过建立运动学正解模型,揭示了刀尖轮廓误差和刀具方位轮廓误差的变化规律,为轮廓误差补偿控制提供了理论依据。在此基础上,设计了轮廓误差补偿控制方法。仿真实验表明,该控制方法能有效地减小轮廓误差。
{"title":"Five-axis CNC machine tool contour error control method","authors":"Le Yang, Liqiang Zhang, Dongdong Li","doi":"10.1145/3366194.3366197","DOIUrl":"https://doi.org/10.1145/3366194.3366197","url":null,"abstract":"In the five-axis CNC machining, various errors caused by factors such as geometrical accuracy and dynamic characteristics of the machine tool will eventually appear as the contour error of the part. Therefore, controlling and compensating for contour errors is of great significance. This paper applies the D-H method in robot kinematics to the error modeling of CNC machine tools, and this paper takes the double turntable five-axis machine tool as the research object. In this paper, by establishing a kinematics positive solution model, the law of the contour error of the tool tip and the contour error of the tool orientation are revealed, which provides a theoretical basis for the contour error compensation control. Based on this, a contour error compensation control method is designed. Simulation experiments show that the control method can effectively reduce the contour error.","PeriodicalId":105852,"journal":{"name":"Proceedings of the 2019 International Conference on Robotics, Intelligent Control and Artificial Intelligence","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114518223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Design of Rapid Battery Pre-test Diagnostic Process 电池快速预试诊断流程设计
Zihou Liu, Xiao Yan, Bixiong Huang, Gengjiong Wang, Zhongcai Liu
WIith the increasing aging of electric vehicle batteries in large quantities, rapid pre-test diagnosis of power battery modules and screening of defective batteries have become market demand. This paper was based on the portable fast battery diagnostic instrument, which quickly checked the lithium iron phosphate battery packs with different degrees of aging to determine whether the battery management system and the battery modules were connected properly. Furthermore, the constant current discharge curve of the battery was analyzed, and the internal resistance of each single cell in the battery module was obtained, thereby characterizing the difference in the aging degree of different single cells. Finally, the same battery module was tested using a portable fast battery diagnostic device. The verification found that after the battery management system and the single battery connection problem were eliminated, the portable device obtained the same result under different detection conditions, and the battery module was aged. The single cell was judged to be a problematic single cell because the internal resistance was too large and the open circuit voltage was too low. The portable device has low cost, simple operation, convenient and fast, and is suitable for rapid troubleshooting and internal resistance detection of the battery module in the field, and does not affect the life of the battery pack itself. The results of the fast battery diagnostic process are reliable and can provide a reference for the promotion of the rapid diagnosis of power batteries.
随着电动汽车电池的大量老化,对动力电池模块进行快速预试诊断和缺陷电池的筛选已成为市场需求。本文以便携式电池快速诊断仪为基础,对不同老化程度的磷酸铁锂电池组进行快速检查,判断电池管理系统和电池模块连接是否正常。进一步分析了电池的恒流放电曲线,得到了电池模块中各个单体电池的内阻,从而表征了不同单体电池老化程度的差异。最后,使用便携式快速电池诊断设备对同一电池模块进行测试。验证发现,在消除电池管理系统和单体电池连接问题后,便携式设备在不同检测条件下获得的结果相同,且电池模块老化。由于内阻过大,开路电压过低,判断该单体电池为问题单体电池。本便携式设备成本低,操作简单,方便快捷,适用于现场电池模块的快速故障排除和内阻检测,且不影响电池组本身的使用寿命。电池快速诊断过程结果可靠,可为推进动力电池快速诊断提供参考。
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引用次数: 0
Routing Optimization of Regional Logistics Vehicles Based on Distribution Information Matching 基于配送信息匹配的区域物流车辆路径优化
W. Lu, Chen Youling
Based on the new perspective of customer location and distribution demand of regional logistics distribution center, this paper integrates the similarity of customer attributes to optimize the matching of vehicle and customer information, and effectively avoids the unreasonable distribution of the number of vehicles and the frequency of delivery. At the same time, when the influence of vehicle speed, load weight and node distance on vehicle energy consumption are considered, a distribution time model with soft time window constraints is established, and the ant colony algorithm for node reversed processing is designed to solve the problem. The results show that the proposed method can reasonably plan the distribution of vehicles and achieve path optimization.
本文基于区域物流配送中心客户定位和配送需求的新视角,整合客户属性的相似性,优化车辆与客户信息的匹配,有效避免了车辆数量和配送频率的不合理分配。同时,在考虑车速、载重和节点距离对车辆能耗影响的情况下,建立了具有软时间窗约束的分布时间模型,设计了节点逆向处理的蚁群算法进行求解。结果表明,该方法能够合理规划车辆分布,实现路径优化。
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引用次数: 1
Simulation Research on Microscopic Characteristics of Elliptical Vibration Turning 椭圆振动车削微观特性仿真研究
Dongsheng Guo, Minliang Zhang
This paper presented the elliptical vibration turning (EVT) and conventional turning (CT) process of high-strength aluminum alloy material Al7050-T7451 by establishing the finite element models. The characteristics of equivalent stress distribution were analyzed in cutting area during EVT process. Furthermore, the microscopic cutting characteristics of elliptical vibration turning such as shear angle, chip morphology and temperature distribution of the tool rake face were further studied and compared with the ordinary turning process. The simulation results showed that the stress distribution was in a dynamic change process during elliptical vibration turning. Compared with conventional cutting, EVT technology can increase the shear angle, and the chip formed in the EVT process was thinner and had larger bending degree. Therefore, EVT technology has important application value in prolonging the service life of tools and improving the cutting performance of plastic materials.
通过建立有限元模型,研究了高强度铝合金材料Al7050-T7451的椭圆振动车削(EVT)和常规车削(CT)工艺。分析了EVT加工过程中切削区等效应力分布特征。进一步研究了椭圆振动车削过程中刀具前刀面的剪切角、切屑形貌和温度分布等微观切削特性,并与普通车削过程进行了比较。仿真结果表明,椭圆振动车削过程中的应力分布处于动态变化过程。与常规切削相比,EVT技术可以增加剪切角,且EVT工艺形成的切屑更薄,弯曲程度更大。因此,EVT技术在延长刀具使用寿命、提高塑料材料的切削性能方面具有重要的应用价值。
{"title":"Simulation Research on Microscopic Characteristics of Elliptical Vibration Turning","authors":"Dongsheng Guo, Minliang Zhang","doi":"10.1145/3366194.3366195","DOIUrl":"https://doi.org/10.1145/3366194.3366195","url":null,"abstract":"This paper presented the elliptical vibration turning (EVT) and conventional turning (CT) process of high-strength aluminum alloy material Al7050-T7451 by establishing the finite element models. The characteristics of equivalent stress distribution were analyzed in cutting area during EVT process. Furthermore, the microscopic cutting characteristics of elliptical vibration turning such as shear angle, chip morphology and temperature distribution of the tool rake face were further studied and compared with the ordinary turning process. The simulation results showed that the stress distribution was in a dynamic change process during elliptical vibration turning. Compared with conventional cutting, EVT technology can increase the shear angle, and the chip formed in the EVT process was thinner and had larger bending degree. Therefore, EVT technology has important application value in prolonging the service life of tools and improving the cutting performance of plastic materials.","PeriodicalId":105852,"journal":{"name":"Proceedings of the 2019 International Conference on Robotics, Intelligent Control and Artificial Intelligence","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128621336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
期刊
Proceedings of the 2019 International Conference on Robotics, Intelligent Control and Artificial Intelligence
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