缓冲材料蠕变特性测试系统设计

Creep Properties Test System Design of Cushion Materials

目的介绍一种缓冲材料蠕变测试系统的设计方法,该系统包括测试装置的硬件设计和相应的测试软件开发。方法设计一种新的缓冲材料蠕变特性的测试装置,并用Lab VIEW软件开发其测试软件系统,采用PC机自带的声卡作为数据采集卡,配合传感器、压频(V/F)转换器等硬件对缓冲材料在一定静压下的厚度变化量进行数据采集与分析,得出缓冲材料蠕变特性曲线。结果位移传感器采集缓冲材料随时间的位移形变,经信号调理、低通滤波后,输入给以LM331芯片所组成的V/F转换器,声卡采集该转换器所输出的频率信号并转换为数字信号,计算机读取该数字信号并在测试软件界面输出蠕变-时间、位移-时间、应力-时间等曲线。结论该测试装置和软件测试系统操作简单,使用PC自带声卡替代昂贵的数据采集卡作为数据采集系统,降低了成本,灵活性和可靠性较高,使缓冲材料的蠕变特性测试更加方便快捷,为更好地掌握缓冲材料蠕变特性进行缓冲设计提供了强有力的工具。

This work aimed to introduce a design method of creep testing system for cushion materials, including the hardware design of the testing device and the development of corresponding software. A new creep properties testing device for cushion materials was designed, and the test system software was developed with Lab VIEW software. The sound card of PC was used as data acquisition card, with the hardware of the sensor and V/F converter used to collect and analyze the thickness variations of cushion material under a certain static pressure to get the creep properties curves of cushion materials. Displacement sensor acquitted the displacement deformation of the cushion materials, and the voltage was input to frequency converter（V/F） consisting of LM331 chip after signal conditioning and low pass filter. The sound card collected the output frequency signal of the converter and converted it into a digital signal. The computer read the digital signal and output the creep-time, displacement-time, force-time curves on the test software interface. The test device and software testing system had the advantages of simple operation and used the sound card of PC instead of expensive data acquisition as a data acquisition system, which reduced the cost, improved the flexibility and liability, and made the cushion material creep test more convenient and efficient, providing a powerful tool for cushioning design to better grasp the creep characteristics of cushion materials.