| Speed and torque are the most typical physical quantities that reflect opreat-ion paramenters of the system in mechanical transmission. Torque and speed measurem-ent are the main source of information of various power machinery condition monitor-ing and fault identification forecasts,and are the essential means that testing various typ-es of mechanical output power which achieve the design specifications, also are the basi-c parameters for design. It needs to understand the power allocation in the working proc-ess of working parts of Micro Combines and other agriculture machinery for de-sign,and its power can be measure by measuring torque and speed of each powered shaft.Our Micro Combines’power, volume,weight,reliability are bad for Japa-n,the reason is that is short of the basic date of practical work power consumption of various componments of Micro Combine which made in our country in the fie-ld for design.So my country design staff just can take a conservative design,and the produces of our country have a large gap between Japanese produces.It has an extreme-ely important significance for improving the quality of our produces that mastery the basic date of practical work power consumption of various componments of micro comb-ine harvester in the field.The measureing device of traditional way of measuring torque that on a large number of leads,because comples of filed working conditions,poor of environment,and vibration at work,it is not suitable for real-time measurements in the filed.While delicated wireless torque sensor is generally the overall total device,and measure the torque need to install the shaft disconnected,Micro Combine has already been done that no installation space.And its high cost,large size,not suitable for field work measuring. Therefore needing to develop a measuring device that smaller size,do not need to make large changes for structures of existing measured agricultural, inexpensive and can be easily installed which can achieve reai-time measurement of micro combine working in the filed conditions.Thus,my design has great practical significance.The issue design a set of real time measuring device fortorque and speed of Micro Combine woring parts.And the measured date can be recorded and stored in the U disk and other storage devices to facilitate future data processing and analysis. Through consulting a large number of literat-ure,abalysis and summary date; Overall program design,modular design,hardware design andsoftware design;Finally debuggi-ng,testing date,analysis,summary and recommendations.The design use silicon strain gauge for torque measurement aensor,hall sensor for speed measuring device.T-hrough main controller achieve to measure the strain resistance change,A/D conversion,date processing,measure torque and speed,wireless date transmission and so on.Hope with the the design help to measure torque,speed,and then through analysis of torque and speed to analysis the power distribution of Micro Combine.The master hardware of measurement device selected the16bits PIC24FJ64-GA004as the master chip,ADS8320as A/D processing chip,MRF89XAM9A as wire-less date transmission module, integrated operational amplifier INA333,and other high performance chips,and these integrated chips build various function circuits.Writing the main program and subprogram of the date processor based on software development environment MPLAB.In addition,the hardware system also uses antielectromagnetic in-terference design and other measures to ensure its stable work in acomplex environment And the date transmission accuracy in the communication network.At the beginning of the system test,adopted the actual working mode of analog measurement in the laboratory conditions. Simulating a single axis of the working parts do the bench test under laboratory conditions,calculate and analyze the date by measure-ing the torque and speed,and verify the feasibility of testing methods,as well as measur-eing the reasonableness and the accuracy of the results. |
PDF Full Text Request