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首页> 外文期刊>Journal of the Brazilian Society of Mechanical Sciences and Engineering >Food mechanics: a new device for testing fruits and vegetables
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Food mechanics: a new device for testing fruits and vegetables

机译：食品机械师：一种测试水果和蔬菜的新设备

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The new mechanical device developed is capable of performing compression tests but also bending, torsion and tensile tests. Its measurement system has the following components: a load cell (0 to 9800 N), a strain gauge signal conditioning board, a plug-in general purpose data acquisition board, and a displacement sensor (0 to 29.7 mm). These components are connected to a personal computer that has specially developed software. The load cell consists of four extensometers, which are sensible to compressive load. The signal conditioning board filters and amplifies the signal, which is acquired by the AD converter, making this information available to be processed by the software. The device is powered by a DC motor (12 to 24 Volts). By setting the motor voltage, it is possible to control its rotation. The displacement sensor was made with a sliding potentiometer, which is pushed by the mobile component of the device while the tests are performed. Finally, the software provides the stress-strain diagram for each test. In order to guarantee reliable results, tests are made with cylindrical samples with same dimensions (radius and length). For the first set of tests, potatoes were studied. The test results for compressive showed an average value of 897.64 kPa. This value seems to be compatible to the ones from the literature. The device proves to be reliable. Moreover, its flexibility allowed testing a variety of fruits and vegetables under compression, tension, torsion and combined loads.
机译：新开发的机械设备不仅可以执行压缩测试，还可以执行弯曲，扭转和拉伸测试。其测量系统具有以下组件：称重传感器（0至9800 N），应变仪信号调节板，插入式通用数据采集板和位移传感器（0至29.7 mm）。这些组件连接到具有专门开发的软件的个人计算机。称重传感器由四个引伸计组成，它们对压缩载荷很敏感。信号调节板对由AD转换器采集的信号进行滤波和放大，从而使该信息可供软件处理。该设备由直流电动机（12至24伏）供电。通过设置电动机电压，可以控制电动机的旋转。位移传感器由一个滑动电位计制成，在执行测试时，该滑动电位计由设备的移动部件推动。最后，该软件为每个测试提供应力-应变图。为了确保结果可靠，对具有相同尺寸（半径和长度）的圆柱形样品进行测试。对于第一组测试，研究了马铃薯。压缩测试结果显示平均值为897.64 kPa。该值似乎与文献中的值兼容。该设备被证明是可靠的。此外，它的灵活性允许在压缩，拉伸，扭转和组合载荷下测试各种水果和蔬菜。

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