HS-200BZ��ʵ���ұ���ɰ���Զ�ĥ�����Ĺ���ά��

一台HS-200BZ型实验室杯型砂轮自动磨样机砂轮转动正常,磨样机构水平移动也正常,但砂轮磨头始终不能上下移动。检查上下进给机械部分正常无卡阻,但是通电后步进电机始终不工作。在检查电控部分时发现,步进电机驱动器(MS-2HO-90M)无55V交流供电电源,但供电变压器本身输出55V电压正常,最后确认是保护部分UF11熔断器发生断路。在更换之后试运行,磨样机恢复正常。     

Control of a grid-connected direct-drive wind energy conversion system

This paper investigates the current control for a grid-connected direct-drive wind energy conversion system (DDWECS) with a permanent magnet synchronous generator (PMSG), which utilizes a back-to-back pulse width modulation (PWM) converter. For the machine-side, the controller adopts a current vector control method based on the rotating reference frame (RRF) and the maximum power extraction (MPE) is realised through the tip speed ratio (TSR) method. For the grid-side, a novel controller is proposed for the first time to be successfully used for the DDWECS, which combining a proportional complex integral (PCI) current inner loop based on stationary reference frame (SRF) for regulating the grid-side current with a dc voltage outer loop for stabilizing the dc bus voltage and compare with the proportional resonant (PR) controller. A system simulation model is established by using the Matlab/Simulink to simulate the performance of the DDWECS and a prototype system has been build and tested to verify the validity of the developed control methods for both machine-side and grid-side and the excellent performance of the DDWECS.     

Cross-task emotion recognition using eeg measures: first step towards practical application

Electroencephalographic (EEG)-based emotion recognition has received increasing attention in the field of human-computer interaction (HCI) recently, there however remains a number of challenges in building a generalized emotion recognition model, one of which includes the difficulty of an EEG-based emotion classifier trained on a specific task to handle other tasks. Little attention has been paid to this issue. The current study is to determine the feasibility of coping with this challenge using feature selection. 12 healthy volunteers were emotionally elicited when conducting picture induced and video induced tasks. Firstly, support vector machine (SVM) classifier was examined under within-task conditions (trained and tested on the same task) and cross-task conditions (trained on one task and tested on another task) for picture induced and video induced tasks. The within-task classification performed fairly well (classification accuracy: 51.6% for picture task and 94.4% for video task). Cross-task classification, however, deteriorated to low levels (around 44%). Trained and tested with the most robust feature subset selected by SVM-recursive feature elimination (RFE), the performance of cross-task classifier was significantly improved to above 68%. These results suggest that cross-task emotion recognition is feasible with proper methods and bring EEG-based emotion recognition models closer to being able to discriminate emotion states for any tasks.     

An application framework for developing collaborative handheld decision-making tools

This paper describes an application framework supporting collaborative handheld decision-making (CHDM). The main characteristics of the framework are: (1) extensive usage of visual elements and gestures; and (2) independence from specific decision-making methods, processes and tasks. The research departed from the analysis and systematisation of several CHDM scenarios, highlighting repeatable behaviour across multiple decision-making contexts. From these scenarios, we distilled a coherent set of common functional requirements organised in three main categories: process, macro- and micro-functionality. The proposed framework has been validated at length through the development of several CHDM tools. Six different tools are described in the paper. The main contribution of this work is a common foundation for developing CHDM tools.     

捆绑式望远镜中间块对镜筒指向误差的影响分析

运用SolidWorks软件的静态分析模块,将捆绑式望远镜中间块的动态分析转化为0°~90°范围内,均匀分布的18个位置的静态分析。中间块每转动5°,对其上基面的镜筒连接圈的位移变化进行数据采集一次,计算出各镜筒之间的夹角变化值并进行对比,最终得到镜筒之间的最大指向误差。此方法为解决同类问题提供了参考价值。     

多点输入对大跨空间结构影响初探

在对大跨度结构进行抗震设计时，需要考虑多点地震输入的影响。在地震波的作用下，加速度会对结构产生惯性力。我们研究的重点是多点输入的影响因素及影响大小。     

浅谈小型土压平衡盾构分体始发技术

本文介绍了海瑞克Φ4340 mm 土压盾构机在广州220 KV航云电力隧道中的分体始发的关键技术及注意事项。     

The effect of individual and task characteristics on decision aid reliance

This research explores reliance behaviours of decision-makers using a decision aid. Objective and subjective task characteristics in the form of task complexity and task difficulty, respectively, are examined, along with the effect of the individual characteristic of expertise. A total of 130 subjects (65 novices and 65 experienced practitioners) completed a lab experiment using a decision aid (Insolve-DG) to help them make decisions for two insolvency tasks with differing levels of complexity. The research finds that the objective task characteristic (task complexity) and individual characteristic (expertise) both affect reliance behaviours; however, their effects are fully mediated by the subjective task characteristic (task difficulty). Expertise and task complexity are both associated with the degree of task difficulty experienced by an individual user: increasing task complexity increases task difficulty, and increasing expertise reduces task difficulty. Task difficulty and task complexity are established as different constructs; and importantly it is task difficulty, not task complexity, that ultimately affects reliance.     

An artificial neural network based decision support system for solving the buffer allocation problem in reliable production lines

One of the major design problems in the context of manufacturing systems is the well-known Buffer Allocation Problem (BAP). This problem arises from the cost involved in terms of space requirements on the production floor and the need to keep in mind the decoupling impact of buffers in increasing the throughput of the line. Production line designers often need to solve the Buffer Allocation Problem (BAP), but this can be difficult, especially for large production lines, because the task is currently highly time consuming. Designers would be interested in a tool that would rapidly provide the solution to the BAP, even if only a near optimal solution is found, especially when they have to make their decisions at an operational level (e.g. hours). For decisions at a strategic level (e.g. years), such a tool would provide preliminary results that would be useful, before attempting to find the optimal solution with a specific search algorithm.     

第二代先进高强钢TWIP钢在车身典型零件上的应用

开发兼具高强度和优良伸长率的高强度钢板,对车身轻量化和提高汽车安全性具有重要意义。深入解析了HC450/950TW钢微观组织、力学性能、成形特性,并通过有限元仿真分析和冲压试验研究了HC450/950TW减震器支座成形性。结果表明:TWIP钢的成形性能大幅优于同级别的QP钢和DP钢,HC450/950TW伸长率大于50%,n值超过0.48。减震器支座应用HC450/950TW成形后,拉延成形深度达到150 mm,零件无开裂、起皱缺陷,成形性良好,并可实现减重2.4 kg,轻量化效果显著。TWIP钢适用于对拉延和胀性要求很高的车身结构零件。