登录

双语推荐：直线光栅尺

进入期刊文章
针对永磁同步直线电动机(PMSLM)的位置检测问题,运用LIDA485直线光栅尺,设计出位置检测电路,分析检测过程与机理,提出检测实现方法,结合霍尔传感器提出初始位置检测方法,最后还介绍了基于LIDA485直线光栅尺的速度检测过程与基本原理。
Aimed at the problem of position detection of permanent magnet linear synchronous motor , using LIDA485 linear grating ruler , designed of the position detecting circuit , analysed process and mechanism principle , specified the detection method , put forward an accurate method to realize the rotor′s initial posi-tion detection combining with the Holzer sensor.Finally, demonstrated of position and velocity of linear grat-ing detection has good anti-interference ability and resisting disturbance ability based on dynamic response function.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
针对正弦波式光栅尺幅值相位细分法中对模数转换处理要求高、软件计算复杂、实时性不强等问题，提出了一种基于方波相移的光栅尺信号检测方法，该方法先将正弦波转换成方波，再从两路方波信号的相对相位位移中提取出光栅尺位移信号，电路简单，软件处理容易，细分精度取决于微处理器主频，对光栅尺信号的正弦近似程度要求不严格，此外，当光栅尺栅距在满足一定条件下与永磁直线同步电机进行一体化设计时，还能直接获得电机动子初始位置，最后，通过实验验证了该方法的可行性，光栅尺的细分精度为0.09μm，直线电机伺服系统的定位控制精度为±0.9μm，
For the problems that the amplitude phase subdivision method for sine￣wave grating signal has a high re￣quirement on ADC,a complex software processing,and a weak real￣timing,a grating signal detection method based on the phase￣shift between suqare waves is proposed. According to this method,sine waves are converted to square waves,and the grating displacement is extracted from the relative phase￣shift between the two square waves. The hardware circuit and the software processing are simple,and the subdivision accuracy is depended on the MCU fre￣quency. The strict sinusoidal similarity of grating signal is not required. Moreover,the mover initial position can be directly obtained when the grating is built in the permanent magnet linear synchronous motor under certain condi￣tion. Finally,the feasibility of this method is verified by experiments,the subdivision accuracy of grating is 0. 09μm,and the positional accuracy of linear motor servo system is ±0.9 μm.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
针对光栅尺具有断电位置复位、无累计误差、高精度优点，在光学隔振平台上分别建立开放式和封闭式绝对光栅尺实验系统，绝对光栅尺采用图像识别原理，以气浮直线电机ArotechABL1500为参考对象，使用激光干涉仪RENISHAW XL‐80校核精度，研究不同结构绝对光栅尺的误码特点及原因。通过对比实验及研究分析，表明封闭式绝对尺相对于开放式绝对尺的误码率要高，开放式绝对式光栅尺的误码率为3％，封闭式绝对式光栅尺的误码率为8％。
Aiming at the advantages of grating scale has that it can set reset for power outage , has no cumulative error with high accuracy ,we established the unsealed and sealed absolute grating experimental systems respectively by using the technology of image identification on the optical vibration isolation platform .Taking the air bearing linear motor ArotechABL1500 for reference ,we checked its accuracy by the laser interferometer RENISHAW XL‐80 ,and an‐alyzed the characters and the causes of the bit errors of different‐structure absolute grating scale .By the contrast experiment and the analysis ,it is proved that the bit error rate of the sealed absolute ruler is higher than that of unsealed ,the bit error rate of the sealed absolute ruler is 3% w hile the unsealed one is 8% .

[ 可能符合您检索需要的词汇 ]

进入期刊文章
该文针对永磁直线同步电机的伺服控制,探讨了一种基于矢量控制逆变器和光栅尺的位置、速度伺服控制方案。速度调节器采用变结构PI控制算法,在消除静差的基础上,提高永磁直线同步电机的响应速度。位置调节器采用PD控制算法,使系统具有平稳、快速、无静差的跟随性能。仿真验证了其可行性,易于实际应用。
For permanent magnet linear synchronous motor servo control , study on the design scheme of posi-tion and speed servo control based on vector control inverter and grating ruler .The speed regulator adopts vari-able structure control of PI , on the basis of eliminating static error , improved the response speed of the perma-nent magnet linear synchronous motor .While the position regulator put to use PD control algorithm , made the following capacity of the system stable , fast, and no static errors .Simulation results prove the feasibility , and this method is easy to practical application .

[ 可能符合您检索需要的词汇 ]

进入期刊文章
选用单片机C8051F340作为主控制芯片,光栅尺作为位移传感器,搭建成闭环控制系统,克服电机失步的影响。采用改进的逐点比较插补算法控制步进电机自由运动。实验证明,本平台能够以较高的精度平稳运行,实现直线和圆弧运动。
With microcontroller C8051F340 as controller and grating ruler as displacement sensor ,a closed loop control system is designed to overcome the lost-step of the step motor .An improved point-by-point comparison interpolation algorithm is used to control the motor .Experimental results show that the platform can move in both line and circle track with rather high precision .

[ 可能符合您检索需要的词汇 ]

进入期刊文章
调强放射治疗(IMRT)是目前先进的放疗技术之一,在临床肿瘤治疗中应用广泛[1].山西大同大学附属医院在原有德国西门子PRIMUS-M型直线加速器的基础上,引进了Pinnacle3治疗计划系统及Linatech电动多叶光栅开展调强放疗.进口加速器内置多叶光栅由于装机量大,与各种治疗计划系统软件已经形成调用相应型号模型安装,而Linatech电动多叶光栅属于新型外置多叶光栅,与进口治疗计划软件匹配案例较少,其集成过程所需参数设置与硬件数据需要严格匹配,方可无缝连接正常工作.本文将对设备集成安装中取得的经验心得与未来可能购置相同设备的同行分享并对其中的细节进行探讨.
@@

[ 可能符合您检索需要的词汇 ]

进入期刊文章
选择刻划机工作台导轨结构时主要考虑爬行以及超精密研磨。试验结果表明,滚柱导轨在不同刻划方式下不存在爬行现象,又便于进行超精密研磨加工以保证直线性精度,成为光栅刻划机工作台导轨的首选结构形式。
Two factors ,such as creeping and super-precision ,are mainly considered to be the indexes to choose the guides structure of the grating ruling machine .The experiment results show that there is no creeping with different ruling methods for the roller guides which is suitable for super-precision grinding process to ensure the linear accuracy .The roller guides is the first choice for the grating ruling machine .

[ 可能符合您检索需要的词汇 ]

进入期刊文章
针对当前精密作动技术领域对精密定位系统提出越来越高的要求,设计了一种由蝶形直线超声电机驱动的二维精密定位平台系统。该定位平台系统行程为50 mm?50 mm,以直线型增量光栅编码器作为位置反馈元件,通过上位机编程实现运动控制卡对精密定位平台系统进行控制。为了实现直线超声电机的驱动,设计了一种新型直线超声电机驱动器,实现驱动电压和驱动频率的独立控制。在控制过程中,通过使用复合控制技术,同时结合直线超声电机具有高分辨率步进的控制特性,最终使系统达到高精度运动的控制效果。实验结果表明,在0~50 mm行程内,实现了小于0.28?m的定位精度。
A kind of two-dimensional (2-D) high precision positioning table system driven by butterfly-shaped linear ultrasonic motors was designed for requirements of precision positioning system in the precision actuator technology field. The range of the precision positioning system is 50 mm by 50 mm, the linear incremental grating encoders were used as feedback components, and the motion control card was used for system control by control algorithm. A novel ultrasonic motor driver, which the output voltage and the frequency can be controlled independently, was designed to drive linear ultrasonic motor. The compound control and the advantages of high resolution stepper characteristics of the linear ultrasonic motor were used for high resolution control effects. Experimental results show that the positioning accuracy is able to achieve less than 0.28μm in the range from 0 mm to 50 mm.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
目的 研究医用直线加速器在静态调强放射治疗(IMRT)照射过程中,内置多叶光栅(MLC)叶片的到位精度及其受机架角度的影响.方法 回顾分析Varian 23EX医用直线加速器在重复10次执行1例鼻咽癌肿瘤静态IMRT过程中产生的动态日志文件,获取各照射野内每条叶片实际走位的相对坐标值,对比放疗计划系统给出的MLC位置坐标,计算Varian 23EX内置MillenniumTM 60对多叶光栅每一条叶片的到位误差和每一对叶片的叶间距误差,对比垂直野(0°)与水平野(103°和257°)不同机架角度对叶片到位精度的影响.结果 全部叶片到位误差分布在±1.00 mm范围内,叶间距误差分布在±0.15 mm范围内.同一射野角度下,每分次治疗间光栅到位误差的标准差值小于0.06 mm.当考虑全部叶片时,103°野的MLC到位误差小于0°野(t=58.74,P＜0.01),而257°与0°野的MLC到位误差差异无统计学意义;当仅考虑参与移动的叶片时,103°野到位误差仍小于0°野,但257°野到位误差在有限范围(＜0.1 mm)内大于0°野,两组对比,差异有统计学意义(￡=41.95、-4.47,P＜0.01).结论 Varian 23EX内置MillenniumTM 60对MLC在执行静态IMRT治疗过程中的到位精度满足IMRT质量控制要求.分次治疗间,光栅到位重复性好.不同射野角度下,重力因素对光
Objective To investigate the impact of gantry angles on the position accuracy of buildin multi-leaf collimator (MLC) during static (step & shoot) intensity modulated radiotherapy (IMRT).Methods The position accuracy of MillenniumTM 60 pairs multi-leaf collimator (MLC) in Varian 23EX medical linear accelerator during 10 fractions of treatments with static intensity modulated radiotherapy (IMRT) was retrospectively analyzed by resolving dynamic therapy log files and MLC planning files.The single leaf position deviation and gap deviation of each MLC pairs were compared between expected values and actual outcomes.The impact of gantry angle on MLC position accuracy was also investigated with paired t-test between vertical and horizontal beams.Results All the MLC position deviations ranged within ± 1.0 mm,while the gap deviations were at the range of ± 1.5 mm.The statistical standard deviation of MLC position deviations among fractions was less than 0.06 mm.After all the 60 pairs

[ 可能符合您检索需要的词汇 ]

进入期刊文章
目的探讨食管癌三维适形放疗(3 dimensional conformal radiation therapy,3DCRT)的近期疗效.方法 68例中晚期食管癌患者行3DCRT,采用东软公司精确放疗系统,包括NMSR600型直线加速器,三维治疗计划系统,全自动多叶光栅,CT模拟定位系统.观察放疗副作用、局部控制率和近期疗效.结论 中晚期食管癌3DCRT显示了较好的局部控制率,且副作用轻微.
purpose:Study of three-dimensional conformal radiotherapy for esophageal carcinoma curative effect observation. Method:In 68 cases in which patients were 42 male, 26 cases of female, Neusoft Corp used in precise radiotherapy system, including NMSR600 linear accelerator, Ray energy 6MV, three-dimensional treatment planning system, Automatic multi leaf collimator.For advanced esophageal cancer. Conclusion: through reasonable chemotherapy decreases the occurrence of metastases, prolonging the period of survival.

[ 可能符合您检索需要的词汇 ]