基于幅频自校准的高精度LVDT模拟器设计  

Design of High Accuracy LVDT Simulator Based on Amplitude-frequency Calibration

作　　者：何宴辉 汪理虎[2] 刘涛 

机构地区：[1]上海航天电子技术研究所,上海201109 [2]上海航天技术研究院,上海201109 [3]中国商用航空发动机有限责任公司,上海201108

出　　处：《计算机测量与控制》2016年第7期268-271,共4页Computer Measurement &Control

摘　　要：电路模拟LVDT传感器在航空发动机测试中有着广泛的应用,相对于机械传感器其降低了使用难度和维护费用;传统模拟器由于电路中变压器的影响,仿真精度较差导致系统测试准确性降低,研制高精度LVDT模拟器存在着较大的工程需求;文章从LVDT传感器工作原理出发,基于乘法型DAC芯片实现了电路合成模拟LVDT传感器;同时在模拟器中设计自动校准单元,利用离线拟合并存储到FPGA中的模板曲线对不同通道进行在线校准,消除了变压器幅频响应的影响,提高了模拟器在宽频率范围内的仿真精度;文章通过理论推导证明了模板曲线的有效性,通过测试数据验证了该模拟器在0.36～10 kHz范围内可达到优于0.1％的设计精度;该模拟器能够逼真模拟LVDT传感器的电气行为,已成功应用于某型号发动机控制系统的地面仿真测试平台中,达到了预期效果.Electronically simulated LVDT sensor is widely used in the aviation engine test field,which lowered use difficulty and maintenance charge relative to mechanical sensor.Conventional simulator＇ s poor accuracy lowered the test accuracy because of transformers.So there are big engineering requirements in designing high-accuracy LVDT simulator.From LVDT simulator＇ s working principles,the paper realized to simulate LVDT sensor based on multiplying DAC chips.Simultaneously we designed auto-calibration unit and utilized fitting template curve to on-line calibration stored in FPGA,which eliminated the impact of amplitude-frequency response and increased simulation accuracy in wide frequency range.The validity of the template curve was proved by theoretical deduction.The excelled 0.1 ％ design accuracy in 0.36～10 kHz range was verified by test data.The simulator can simulate LVDT sensor＇ s electrical character,which has been used successfully in some aircraft engine control system simulation test platform,achieving expected effect.

关 键 词：LVDT模拟器 校准 幅频响应 

分 类 号：TN919[电子电信—通信与信息系统]