[1]刘 鹏,王 茜,王西泉,等.多通道振动传感器高精度同步采集方法[J].计算机技术与发展,2022,32(01):170-174.[doi:10. 3969 / j. issn. 1673-629X. 2022. 01. 029]
　LIU Peng,WANG Qian,WANG Xi-quan,et al.High Precision Synchronous Acquisition Method ofMulti-channel Vibration Sensor[J].,2022,32(01):170-174.[doi:10. 3969 / j. issn. 1673-629X. 2022. 01. 029]
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多通道振动传感器高精度同步采集方法()
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《计算机技术与发展》[ISSN:1006-6977/CN:61-1281/TN]

卷:
32
期数:
2022年01期
页码:
170-174
栏目:
应用前沿与综合
出版日期:
2022-01-10

文章信息/Info

Title:
High Precision Synchronous Acquisition Method ofMulti-channel Vibration Sensor
文章编号:
1673-629X(2022)01-0170-05
作者:
刘 鹏; 王 茜; 王西泉; 李鹏勃
中国兵器工业试验测试研究院,陕西 华阴 714200
Author(s):
LIU Peng; WANG Qian; WANG Xi-quan; LI Peng-bo
Test and Measuring Academy of China Ordnance Industries,Huayin 714200,China
关键词:
AD7656; 多路同步采集; 振动传感器; 遥测; FPGA
Keywords:
AD7656; multi-channel synchronous acquisition; vibration sensor; telemetry; FPGA
分类号:
TP212. 9;TJ06
DOI:
10. 3969 / j. issn. 1673-629X. 2022. 01. 029
摘要:
复杂结构体在高速运动时受力复杂,分结构之间的受力互为耦合,结构体多点位振动数据的高精度同步采集对结构体力学仿真和仿实一致性分析至关重要。 为满足结构体高速运动时振动数据的高精度同步采集,基于 AD7656 +FPGA的设计思路,该文使用主控芯片 FPGA 产生一组采集控制信号,同时对 8 片 AD7656 进行控制,确保各片 AD7656 间的同步精度,同时为提高回读速度,采用三 DOUT 输出模式,大大降低 FPFA 的资源要求和布线难度,对同一时刻采集的 48 路振动传感器数据,按照遥测帧格式,编成一个数据帧,形成 PCM 码流,通过遥测发射机实时发送至遥测地面站,通过遥测地面站对数据进行实时显示和存储;设计了同步采集精度实验室验证方法,使用一台高采样率的数据采集设备同时对采集触发信号、片选信号、8 个 AD 时钟信号进行采集,通过对比片选信号后的第一个时钟信号的相位差,就可以测量出 8 片AD7656 之间的同步采集时间精度。 最终验证的多路同步采集时间精度小于 1 滋s,可满足系统设计的要求。 该方法已实际应用于相关试验测试。
Abstract:
The force of complex structure is complex when it is moving at high speed,and the forces of sub structures are coupled witheach other. High precision synchronous acquisition of multi - point vibration data is quite important for mechanical simulation andsimulation consistency analysis of structure.? ? ? ? ? ? ? ?In order? to meet the high - precision synchronous acquisition of vibration data when thestructure is moving at high speed,based on the design idea? ? ? ? ? ? of AD7656+FPGA,we use the main control chip FPGA to generate a group ofacquisition control signals,and control eight AD7656 to ensure the synchronization accuracy among them. At the same time,in order toimprove the read back speed,three DOUT output mode is adopted,which greatly? reduces the resource requirements and wiring difficultyof FPFA. 48 channels of vibration sensor data collected at the same time are compiled into a data frame according to the telemetry frameformat to form PCM code stream,which is sent to the telemetry ground station in real time through the telemetry transmitter,and the datais displayed and stored in real time through the telemetry ground station:A high sampling rate data acquisition device is used to collecttrigger signal,chip selection signal and eight ad clock signals at the same time. By comparing the phase difference of the first clock signalafter chip selection signal,the synchronous acquisition time accuracy between eight AD7656 can be measured. Finally,the multi-channelsynchronous acquisition time accuracy is less than 1 滋s,which can meet the requirements of system design. This method has been appliedto the related test.
更新日期/Last Update: 2022-01-10