In-system programmable devices are products that combined modern electronic techniques and semiconductor techniques.They are indispensable devices in designing modern circuits and systems.This paper presents two pract...In-system programmable devices are products that combined modern electronic techniques and semiconductor techniques.They are indispensable devices in designing modern circuits and systems.This paper presents two practical circuits designed with programmable devices and its design method.By introducing programmable devices into gas sensor circuits,we can further improve system reliability,stability,sensitivity and integration degree,and enhance flexibility of system design.展开更多
针对结构振动试验中仅能获取应力均方根(root mean square,RMS)值而缺失功率谱密度(power spectral density,PSD)数据的问题,提出一种试验-仿真融合的振动应力PSD重构方法。该方法通过模态试验修正有限元模型,结合实测模态阻尼与RMS约...针对结构振动试验中仅能获取应力均方根(root mean square,RMS)值而缺失功率谱密度(power spectral density,PSD)数据的问题,提出一种试验-仿真融合的振动应力PSD重构方法。该方法通过模态试验修正有限元模型,结合实测模态阻尼与RMS约束优化,实现高精度PSD重构。基于航空组合件在宽带随机振动(20~1000 Hz)下的试验验证表明:重构PSD与试验PSD在谱型(主频误差<2%、幅值误差<5%)和RMS值上均高度吻合;采用24种载荷谱模型的疲劳寿命预测最大误差为10.2%,其中18种模型误差低于3.28%。以某机载液压驱动装置为例,验证了该方法在结构优化中的实用性,显著减少实物试验迭代次数。展开更多
可编程外围器件 PSD应用于 MCU系统后 ,单片机可以执行一个存储器的代码 ,同时擦除和编程另一个存储器 ,因而可以通过上位机远程更新用户软件 ,实现在线编程 (In A pplication Program ming)。同时 ,简化了 MCU外围电路的设计 ,增加了...可编程外围器件 PSD应用于 MCU系统后 ,单片机可以执行一个存储器的代码 ,同时擦除和编程另一个存储器 ,因而可以通过上位机远程更新用户软件 ,实现在线编程 (In A pplication Program ming)。同时 ,简化了 MCU外围电路的设计 ,增加了系统的可靠性和稳定性。展开更多
For electronic piezo gauge used for testing gun chamber pressure, its internal miniature pulse-powered photoelectric invert switch cannot often be powered up normally. To solve this problem, a test system for invert s...For electronic piezo gauge used for testing gun chamber pressure, its internal miniature pulse-powered photoelectric invert switch cannot often be powered up normally. To solve this problem, a test system for invert switch is presented to verify the reliability of the invert switch. The test system uses complex programmable logic device （CPLD） to control data acquisition of A/D converter and data storage of external flash memory, and then transmits the acquired data to a computer for data analysis and processing. The test system can provide the required sampling frequency of the signal in high temperature, normal temperature and low temperature environments, and the reliability of the invert switch can be verified according to the signal parameters. The results show that the test system has high precision and the tested invert switch has low power consumption and high reliability.展开更多
文摘In-system programmable devices are products that combined modern electronic techniques and semiconductor techniques.They are indispensable devices in designing modern circuits and systems.This paper presents two practical circuits designed with programmable devices and its design method.By introducing programmable devices into gas sensor circuits,we can further improve system reliability,stability,sensitivity and integration degree,and enhance flexibility of system design.
文摘For electronic piezo gauge used for testing gun chamber pressure, its internal miniature pulse-powered photoelectric invert switch cannot often be powered up normally. To solve this problem, a test system for invert switch is presented to verify the reliability of the invert switch. The test system uses complex programmable logic device （CPLD） to control data acquisition of A/D converter and data storage of external flash memory, and then transmits the acquired data to a computer for data analysis and processing. The test system can provide the required sampling frequency of the signal in high temperature, normal temperature and low temperature environments, and the reliability of the invert switch can be verified according to the signal parameters. The results show that the test system has high precision and the tested invert switch has low power consumption and high reliability.
