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首页> 外文学位 >INSTRUMENTATION FOR IN-FIELD MEASUREMENTS OF ENERGY INPUTS TO TRACTOR-POWERED AGRICULTURAL IMPLEMENTS (INSTRUMENTATION, TRACTOR, COMPUTER, DATA ACQUISITION, PTO).
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INSTRUMENTATION FOR IN-FIELD MEASUREMENTS OF ENERGY INPUTS TO TRACTOR-POWERED AGRICULTURAL IMPLEMENTS (INSTRUMENTATION, TRACTOR, COMPUTER, DATA ACQUISITION, PTO).

机译：拖拉机投入的农业实施对能源输入进行现场测量的仪器（仪器，拖拉机，计算机，数据获取，PTO）。

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摘要

A second generation data acquisition system, integrally mounted on a two-wheel drive 75-PTO kW agricultural tractor, was interfaced to various sensors which measured: (1) time, (2) implement draft, (3) left and right drive axle torque, (4) left and right drive wheel rotation, (5) ground surface displacement, (6) fuel flow, (7) PTO torque, and (8) engine flywheel rotation. This data gathering system was centered around a DEC PDP11/03-LK microcomputer using the RT-11 operating system and having a linkage of MACRO-11 and FORTRAN IV data acquisition routines. Magnetic memory, of the same capacity as two RX01 floppy disks, was subdivided into the system device and the data storage device. Real-time data were displayed in engineering units on the operator CRT console. Physical transfer of archived test data for mainframe statistical analysis was accomplished using a TU58 tape drive.; Sensors were simultaneously sampled once per second using a crystal controlled hardware interrupt. Before sampling by an A/D board, each analog signal was passed through an active low-pass filter having a one-half Hz cutoff frequency to satisfy the Nyquist Criterion of the Sampling Theorem. Digital signals were counted by an in-house designed counterboard. Digital count values were read and subsequently cleared through software.; Digital sensors were (1) two bi-directional optical shaft encoders measuring rear axle speeds, (2) a transducer sensing fuel consumption rates, (3) a single-beam radar unit measuring true ground speeds, and (4) a passive magnetic sensor monitoring engine speeds. Analog sensors included mounted strain gauges detecting drive wheel torques and implement drafts, and a commercial load cell sensing PTO torques.; The revised data acquisition system has been field tested for three growing seasons with repeatable results. Specific tests included gathering energy consumption data of tillage operations, and acquiring data showing the energy used throughout the formation of a round bale. In addition, the performance of three ground speed sensors was determined while traversing selected ground surfaces at various operating speeds.; Further work is needed on the sensor used for measuring the drafts produced by towed PTO-driven implements. Also, minor adjustments to the counterboard are required.
机译：第二代数据采集系统集成安装在两轮驱动的75-PTO kW农用拖拉机上，与各种传感器连接，这些传感器测量：（1）时间，（2）机具吃水，（3）左右驱动轴扭矩，（4）左右驱动轮旋转，（5）地面位移，（6）燃油流量，（7）PTO扭矩和（8）发动机飞轮旋转。该数据收集系统以使用RT-11操作系统的DEC PDP11 / 03-LK微型计算机为中心，并具有MACRO-11和FORTRAN IV数据获取例程的链接。与两个RX01软盘具有相同容量的磁存储器被细分为系统设备和数据存储设备。实时数据在操作员CRT控制台上以工程单位显示。使用TU58磁带机完成了用于大型机统计分析的已存档测试数据的物理传输。使用晶体控制的硬件中断，每秒同时对传感器进行一次采样。在通过A / D板采样之前，每个模拟信号都要经过一个具有一半Hz截止频率的有源低通滤波器，以满足采样定理的奈奎斯特准则。数字信号由内部设计的柜台进行计数。读取数字计数值，然后通过软件清除。数字传感器包括（1）两个测量后轴速度的双向光学轴编码器，（2）传感油耗率的传感器，（3）测量真实地面速度的单波束雷达单元以及（4）无源磁传感器监控发动机转速。模拟传感器包括安装好的应变计，用于检测驱动轮扭矩和机具吃水深度，以及用于检测PTO扭矩的商用称重传感器。修改后的数据采集系统已经在三个生长季节进行了现场测试，结果可重复。具体测试包括收集耕作操作的能耗数据，以及获取显示整个草捆形成过程中使用的能量的数据。另外，在以不同的运行速度穿越选定的地面时，确定了三个地面速度传感器的性能。用于测量由牵引式PTO驱动的机具产生的吃水深度的传感器还需要做进一步的工作。另外，还需要对柜台板进行细微调整。

著录项

  • 作者

    FREELAND, ROBERT SHERRON.;

  • 作者单位

    The University of Tennessee.;

  • 授予单位 The University of Tennessee.;
  • 学科 Engineering Agricultural.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 170 p.
  • 总页数 170
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农业工程;
  • 关键词

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