摘要：For cone beam computed tomography(CBCT),there has long been a desire to modulate the intensity and distribution of the X-rays to accommodate the patient’s anatomy as the gantry rotates from one projection to *** would reduce both image artifacts and radiation ***,the current beam modulation setups,such as dynamic bowtie filters,may be too complex for practical use in clinical *** study aimed to investigate a simplified dynamic beam filtration strategy for CBCT imaging to reduce image artifacts and radiation *** this study,the beam filtration was designed to vary dynamically as the CBCT gantry rotates around the ***,two distinct components were integrated:the sheet filter part and the bowtie filter *** dynamic beam filtration setup has two working schemes,one is a combination of dynamic sheet filter and dynamic bowtie filter,denoted as dynamic filterdynamic bowtie(DFDB);the other is a combination of dynamic sheet filter and static bowtie filter,denoted as dynamic filter-static bowtie(DFSB).Numerical imaging experiments were performed for three human body parts:the shoulder,chest,and *** addition,the Monte Carlo simulation platform MC-GPU was used to generate the dose distribution *** showed that the proposed DFDB and DFSB beam filtration schemes can significantly reduce the image artifacts and thus improve the CBCT image *** on the scanned object,the total radiation dose could be reduced by 30%.The proposed simple dynamic beam filtration strategy,especially the DFSB approach,could be beneficial in the future to improve the CBCT image quality with reduced image artifacts and radiation dose.

摘要：汽车作为重要的代步工具,为人们的出行提供了极大的方便,但是,随之而来的晕车发生率呈不断上升的趋势。本文针对乘客在汽车加速、转向、制动等工况下的运动刺激和乘客自身感觉冲突等晕动症诱发因素,设计一种体感视觉综合防晕车座椅自主平衡装置。该装置依靠座椅减震器和自动控制系统保持竖直和水平方向上的体感平衡,借助头戴式显示设备使得内耳前庭感受器与视觉感受到的信息一致,保持体感与视觉的协同平衡,从而达到综合防晕车的效果。

摘要：To solve the multi-variable and multi-objective optimization problem in the thermal design process of the dual-input aeronautic static inverter,an optimization method based on the combination of the multi-objective evolutionary algorithm based on decomposition(MOEA/D)and the fuzzy set theory is *** heat transfer path of the power device is analyzed and an equivalent heat circuit is *** take junction temperature of the power device,mass,and cost of the heat sink as optimization goals,and take the heat sink structure parameters as design variables to conduct thermal optimization based on MOEA/*** paper carries out a comparative study,and the results show that the proposed improved algorithm can meet the different requirements for multi-objective weights,and have good rapidity and robustness.

摘要：针对风机风量调整机液伺服系统装机前性能检测的问题,设计了一种高速旋转机液伺服液压缸试验台。试验台设计了双头导壳结构及试验缸与加载缸双轴向配油机构,以实现加载缸与试验缸同步高速旋转中的加载试验。运用ANSYS Workbench软件对机液伺服液压缸高速旋转试验台进行模态分析,给出了试验台前6阶固有频率与振型。仿真分析结果显示,试验台的强度符合要求,试验台所受激励频率远小于其1阶固有频率,不会产生共振。该研究实现了对高速旋转机液伺服液压缸试验台的结构设计及力学性能分析,为高速旋转液压缸试验台的搭建奠定了基础。

摘要：分析了原有风机风量调整伺服缸试验装置存在的无法模拟伺服缸高速旋转缺陷,设计了一种可实现模拟风机高速旋转工况的新型电液伺服缸试验装置,对原有机械结构和液压系统进行了改进设计,能够较好地满足产品试验的需要。

摘要：进入21世纪以来利用机器人代替人工作业的理念已经在全世界范围内得到了广泛认可,机器人技术的发展水平已成为一个国家高新技术产业的代表,而智能安防机器人作为众多机器人中的一员更是受到了广泛的关注。针对智能安防机器人设计了一套功能强大、性能稳定的控制系统,首先采用模块化的设计思路,对智能安防机器人控制系统的总体架构进行了设计;其次对机器人控制系统主控器进行了设计研发,并对机器人运动控制子系统、传感器子系统以及摄像头控制子系统进行了研究设计;最后利用机器人平台对控制系统进行了实验测试,并对实验结果进行了分析总结。可以预见,安防机器人在降低人工操作危险性、减少企业成本等方面具有重要意义。