• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >A piezoelectric film sensor improvement and evaluation for measuring water droplet impact energy and determining droplet impact effects on soil surfaces.
【24h】

A piezoelectric film sensor improvement and evaluation for measuring water droplet impact energy and determining droplet impact effects on soil surfaces.

机译：压电膜传感器的改进和评估，用于测量水滴的冲击能量并确定水滴在土壤表面的影响。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The overall objectives of this research were to test the response linearity of a large piezoelectric film to water droplet impact and to evaluate the sensor in a real application of measuring water droplet impact. A piezoelectric film with a large sensing area (203 mm long x 140 mm wide) was used in this research. The sensing area was divided into five sections to test the sensor similarity. Water drops of the same kinetic energy were allowed to hit each section several times. The output of each section was averaged and compared with the output of the other sections to test the sensor similarity. The results of the similarity test show that the sensor responded similarly to the same water droplet impact at different locations on the sensing area.;Then, the piezoelectric film was calibrated using water drops of different sizes released from specific heights. The calibration data was used to develop a calibration curve for this particular type of piezoelectric film. The result showed that piezoelectric film responded linearly to varying water droplet impact forces.;Sprinkler droplet kinetic energy generated by a 6.35 mm nozzle at three operating pressures was measured using the piezoelectric film. The result showed that kinetic energy produced by the sprinkler decreased as operating pressure increased. The output data was analyzed and used to develop a simulation model for predicting kinetic energy under sprinkler irrigation.;Finally, the effect of droplet impact produced by irrigation sprinklers on erosion was investigated using a simulated section of a center pivot irrigation system. The system was assembled in the laboratory and consisted of 4 nozzles spaced 2.44 m (8 ft) apart. Runoff samples were collected every 5 min for about 210 min at three operating pressures. After measuring the runoff volume of each sample, the sample was oven dried to determine the eroded soil mass. The erosion results, in conjunction with the kinetic energy measurement results, were used to develop a mathematical model to predict soil erosion under the sprinkler.
机译：这项研究的总体目标是测试大型压电薄膜对水滴撞击的响应线性，并在实际测量水滴撞击的应用中评估传感器。在本研究中，使用了具有大感应面积（203毫米长x 140毫米宽）的压电薄膜。感应区域分为五个部分，以测试传感器的相似性。具有相同动能的水滴多次撞击每个部分。平均每个部分的输出，并将其与其他部分的输出进行比较，以测试传感器的相似性。相似性测试结果表明，传感器对感应区域不同位置上相同的水滴撞击具有相似的响应。然后，使用从特定高度释放的不同大小的水滴来校准压电膜。校准数据用于为这种特殊类型的压电薄膜绘制校准曲线。结果表明，压电薄膜对变化的水滴冲击力具有线性响应。；使用压电薄膜测量了在三个工作压力下，由6.35 mm喷嘴产生的喷头液滴动能。结果表明，喷头产生的动能随着工作压力的增加而降低。分析输出数据，并用于建立用于预测喷灌条件下动能的仿真模型。最后，使用中心枢轴灌溉系统的模拟部分研究了灌溉喷头产生的液滴冲击对侵蚀的影响。该系统在实验室中组装而成，由4个间隔为2.44 m（8 ft）的喷嘴组成。在三个工作压力下，每5分钟收集约210分钟的径流样品。在测量了每个样品的径流量后，将样品烘箱干燥以确定侵蚀的土壤质量。侵蚀结果与动能测量结果一起用于建立数学模型来预测喷头下的土壤侵蚀。

著录项

  • 作者

    Basahi, Jalal M. A. M.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Applied Mechanics.;Agriculture Soil Science.;Engineering Agricultural.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 121 p.
  • 总页数 121
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号