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《仪表技术与传感器》2015,(8)
中频信号处理电路是雷达测距系统的核心硬件。在计算得到滤波及放大电路的关键参数后,基于双运放MC33078,设计实现了包含高通和低通2个单元的滤波电路;利用可调增益放大器AD603和静电计级运算放大器OPA128等设计实现了可调增益放大器、峰值检波电路和AD/DA转换电路。对所设计的关键电路进行了模拟验证,并通过对静态目标的测距实验,验证了中频信号处理电路对雷达测距的适用性和测试值相对于计算值的准确性。 相似文献
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按照虚拟仪器的设计方法,提出并研制了一种多点压力实时监测系统。系统由扩散硅压力传感器组、信号处理电路、数据采集卡和计算机等硬件组成,在软件的支持下,能以形象直观的方式显示多点压力值并及时给出异常报警。实验证明此系统构建简单,性能稳定,运行可靠。 相似文献
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针对备用供电系统的不足,提出一种供电监测与保护系统.对供电控制系统进行了总体设计,拓扑网络采用主从式,功能模块包括总控模块、监测模块、均衡模块、采集模块、通讯模块等.对关键的硬件电路进行了设计,基于STM32F103RET6单片机对总控电路、监测电路以及保护电路进行了设计,不仅能够保证系统集成度,而且提高了信号检测精度. 相似文献
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《仪表技术与传感器》2015,(8)
随着光纤传感、光纤陀螺等技术的飞速发展,超辐射发光二极管(SLD)运用场所也是越来越多,SLD光源的稳定性对光纤传感系统性能有及其重要的影响,为了提高光纤传感的精度设计了一种基于STM32的恒电流恒温度超辐射光源系统。该系统采用了运算放大器作为放大器件的恒流源电路技术方案确保电流稳定性,使用了PID算法确保温度控制电路稳定性,具有良好触摸屏控制的人机界面。文中对超辐射光源系统的硬件和软件进行了具体阐述。测试结果证明,该系统在正常温度下一定工作时间内都能保证SLD输出功率稳定在±0.01d Bm范围内,能够很好符合相关需求。 相似文献
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刘海宁 《机械制造与自动化》2013,42(4)
以单片机、D/A转换器以及运算放大器为核心,设计了一种数字式阈值可调的比较电路,于报警系统、自动控制等领域,并分别对硬件电路和软件程序进行了设计与编写,运用Protues软件对设计的电路系统进行仿真分析.最终实现通过上位机电压数值输入确定电路输出电压值作为信号比较阈值的目的. 相似文献
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设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率. 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。 相似文献
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本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
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Polyvinyl pyrrolidone-Iodine complex (PVP-I) molecules were impregnated into the anodic oxide of an aluminum disk specimen. It was rubbed against a silicon nitride ball specimen using a ball-on-disk type friction test rig. Over the limited range of parameters studied (load: 0.2-1.0 N, sliding velocity: 0.6 mm/s, and sliding distance: 1-7 m), the coefficient of friction decreased to a value as low as 0.01 from values of 0.3 to 0.7 for the anodic oxide surface. Single-crystal iodine rubbed against silicon nitride showed a coefficient of friction of 0.1. The low coefficient of friction is attributed to the thin PVP-I film on the relatively hard anodic oxide. The mechanism of coefficient of friction reduction is the same as that of a thin soft film on a hard substrate. 相似文献
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