描述
势通过检测电路滤波、放大、整形送给单片机,单片机根据接收的信号,通过软件方式反馈给激振电路驱动电磁线圈。通过反馈,弦能在电磁线圈产生的变化磁场驱动下在本振频率点振动。当激振信号撤去后,弦由于惯性作用仍然振动。单片机通过测量感应电动势脉冲周期,即可测得弦的振动频率,最后将所测数据显示出来。测频原理框图如图2所示。
2.2系统硬件电路设计
根据以上的基本原理和思想,设计的测频系统的整体电路如图3所示。主要由激振电路、检测电路、单片机控制电路和显示电路等几部分组成。工作过程是由单片机产生某一频率的激振信号,经放大后激励振弦振动,拾振线圈中产生的感应电动势经几级放大后送给单片机处理,最后送显示电路显示。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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