【正文】 上，在激光座上方有一個(gè)螺紋孔，是為了固定激光器的位置是可以加上螺栓擰緊。下面就這兩部分做簡單概述。通過上緊螺栓使整個(gè)實(shí)驗(yàn)裝置能穩(wěn)定的固定于要測試的平臺之上。準(zhǔn)確度高，人為干擾因素小，可以較大幅度提高實(shí)驗(yàn)測算數(shù)據(jù)的可信度，和提高工作效率（如圖512）。1. 調(diào)節(jié)裝置位置，使定位錐位于擺盤的圓心下方。5. 打開激光座上的激光器，調(diào)節(jié)激光座位置，使激光器發(fā)射出來的光點(diǎn)位于擺盤黑線約35mm處，調(diào)節(jié)激光器的供電電壓，使激光的亮度適中。調(diào)試過程中用直徑D=100（mm）,厚度=(mm)，材料比重=，吊線半徑r=38mm。用兩種不通的方式獲取周期信按照公式： 計(jì)算不同線長的轉(zhuǎn)動慣量值，以計(jì)算各級轉(zhuǎn)動慣量值并且填入表中。綜上所述，通過改進(jìn)后的實(shí)驗(yàn)輔助裝置可有效提高“三線擺”法測轉(zhuǎn)動慣量的精度。本課題取得了階段性的成果。同時(shí)自主設(shè)計(jì)了圓盤釋放裝置與測試裝置固定機(jī)構(gòu)，使本人機(jī)械設(shè)計(jì)的相關(guān)能力得到了較大的提升。我的畢業(yè)指導(dǎo)老師梁瑩林老師給了我們巨大的支持與幫助，使我能夠順利完成畢業(yè)設(shè)計(jì)，在此表示衷心的感激。由于我的學(xué)術(shù)水平有限，所寫論文難免有不足之處，懇請各位老師和學(xué)友批評和指正！江蘇技術(shù)師范學(xué)院畢業(yè)論文附 錄附錄1 實(shí)驗(yàn)輔助裝置的電路圖 附錄2 實(shí)驗(yàn)輔助裝置的裝配圖江蘇技術(shù)師范學(xué)院畢業(yè)論文外文資料原文ZBIGNIEW DWORECKI, ANDRZEJ FISZER, MARIUSZ ?OBODA, JACEK PRZYBY?Institute of Agricultural Engineering Agricultural University of Poznan, PolandCALCULATION OF TRACTOR AND AGRICULTURAL MACHINES MOMENTSOF INERTIASummaryDetermination of tractor moments of inertia is not so easy. There are known few methods of indirect measurement of moment of inertia, but the hanging tractor is necessary in this methods. Suspension of the tractor is a long shot. This is the reason, that most of authors assume the quantity of moment of inertia only intuitionally, without measurements, in their putation. Tractor moments of inertia can be evaluated through “geometricmass” tractor model. Main tractor elements, like corps, wheels, cabin, wheel reduction gears, halfshafts, can be admitted by non plicated geometric body, like cylinder, ring, cone, rectangular, torus, plate, box constructed from plate. Dimensions and weightiness of this geometric body must be the same that tractor units. The main moments of inertia of this solid are easily calculated. Steiner principle provide calculation main moments of inertia of all tractor body. These moments of inertia were applied in mathematical models of the tractor, built for eigenfrequencies calculation. Tractor vibrations were measured for verification of the models. These measured frequencies were similar to frequencies calculated from received models. It means, that suggested method of tractor moments of inertia determination, is accurate. This easy method allows to leave out big mistakes in calculation of tractor free vibrations frequencies.1. IntroductionThe farm tractor is the farmer’s basic tool. Consequently, it is also his frequent workplace. In performing their work in the field, tractor operators are exposed to dust, noise, warm cold weather (temperature), precipitation (rain) and mechanical vibrations. The tractor cab may eliminate dust, noise and precipitation. Airconditioned cab may eliminate effect of temperature, and, provided the cab is suspended on springs, partially eliminate vibrations. The vibrations affecting the driver may be generated by the engine, machinery attached to the tractor and tractor wheels (collisions with obstacles). Vibrations generated by the engine and machinery attached to the tractor are insignificant in present engines and machines. Vibrations generated by tractor wheels may be detrimental to human body organs, because the frequency of tractor vibration can be the same that eigenfrequency of human body hazardous are the highamplitude and lowfrequency vibrations which can cause damage to many human body organs. Frequencies of tractor vibrations are a bination of tractor eigenfrequencies and depend on excitation. Tractor eigenfrequencies we can to get to know if we build mathematical model of the tractor.2. Model of the tractorA dynamic model may be created by using many is no need to prove that the finite element method is too accurate for our purposes. It is so because of the big discrepancy between the rigidities of tires and the driver39。 Graef, 1976) abounds with models of vehicles, including models of tractors. However sometimes, such models do not account for the differences between a typical truck and tractor such as the lack of suspension of the rear axle and the degree of swinging of the tractor front axle. The simplest models of the tractor which may be accepted, can be created in lateral plane and front plane of the tractor (fig. 1 and 2). The mode (shape) of vibrations in lateral plane tractor model is vertical and pitch. The mode of vibrations in front plane is vertical and mathematical formula of lateral plane tractor model shown on fig. 1 is:Fig. 1. Lateral plane tractor model: m mass of the system, Jb pitch moment of inertia of the system, k1the sum of front tyres stiffness, k2 the sum of rear tyres stiffness, ?a” wheel base (rear axle to front axle), l front axle to centre of gravity calculated by changes of the wheels load with simultaneous measurements of ground reaction with the accuracy of 1N and the resulting deflections with 0,01 mm accuracy. The mathematical formula of front plane tractor model shown on fig. 2 is: Fig. 2. Front plane tractor model: m mass of the system,Jc roll moment of inertia of the system, k1,2 the sum of one front and one rear tyre stiffness, r track of wheels For calculation the frequency from presented formulas, it is necessary to know the quantity of all the parameters from right side of the mass and the geometric parameters “a” (wheel base,rear axle to front axle) and “r” (track of wheels) may be found by using factory specifications or by weighing and measuring. The ?l” distance (front axle to centre of gravity) may be calculated by using factory specifications of axle loads. The measuring of vertical stiffness of front and rear tyres is also not difficult. The rigidity of tires may be calculated by changes of the wheels load with simultaneous measurements of ground reaction with the accuracy of 1N and the resulting deflections with 0,01 mm accuracy.3. Calculation of moments of inertiaThe mass moment of inertia of the tractor relative to the frontback axis and leftright axis, cutting through the mas