Design and experiment of a high-clearance self-propelled sprayer chassis

Abstract

A large high-clearance self-propelled sprayer chassis was designed according to the requirements of the sprayer's driving operation and the overall goal. The structural characteristics and working principle of the chassis drive system, suspension system, track adjustment system, and frame were analyzed. A finite element analysis of the frame was carried out under four extreme conditions: full load bending, full load torsion, full load emergency braking and full load emergency turning. Under these four conditions, the maximum stress values of the frame were 149.45 MPa, 219 MPa, 151.44 MPa, and 123.27 MPa respectively, and the maximum strain values were 1.12 mm, 2.22 mm, 0.95 mm, and 1.16 mm respectively. A theoretical analysis of the stability, steering ability, and obstacle navigation of the sprayer chassis was conducted. The results showed that the upper angle θ lim , lower angle θ ‫׳‬ lim and lateral limit tumbling angle φ lim of the sprayer chassis were 50.1°, 30.0° and 35.3° respectively. The minimum turning radius of the chassis was 5816 mm, and the minimum turning width was 4113 mm. The maximum obstacle crossing heights of the front and rear wheels were 466 mm and 457 mm. The theoretical analysis showed that the designed chassis met the field management operations of large plots. A field experiment of the high-clearance self-propelled sprayer chassis at full load was conducted. The experimental results were consistent with the theoretical analysis results. The sprayer chassis not only good handling stability but also good ride comfort. The results of this study provide references for the design of high-clearance self-propelled sprayer chassis.

Multibody Dynamics Simulation and Vibration Test for High Clearance Orchard Sprayer

“…In Figure 9, the overall stress of the frame is mostly below 70 MPa, and the maximum stress appears at the left support frame trunnion at 309 MPa. When a load was applied 1.5 times, the maximum stress extreme of the complete vehicle was still less than the safe allowable stress of the frame material (345 MPa) [14]. This indicates that the safety factor of the whole vehicle is greater than 1.5, which is in the safe range, and that the design of the whole vehicle has no strength defects.…”

“…Based on the Newmark-β method, Xing M et al proposed a numerical simulation method for solving the differential equations to study the effect of the man-machine seat of a high clearance sprayer machine under load excitation [13]. A finite element model of the high clearance sprayer was established, Yu Chen et al analyzed and tested that the overall strength and stiffness of the chassis frame of the high clearance sprayer met the requirements [14].…”

Аналітичні Положення Впливу Повноти Технічного Контролю На Безвідмовність Самохідних Обприскувачів

“…Більше того, технічний контроль самохідного обприскувача лише тоді дає помітний ефект, коли обґрунтовано призначається технічне обслуговування. При технічному обслуговуванні додатково можуть виявлятися відмови, які не виявляються вбудованими (штатними) засобами технічногоконтролю (приховані відмови).Необхідно відзначити, що моделі надійності з урахуванням неповноти та відмов контролю, особливостей функціонування та відновлення можуть бути досить нетривіальними [22]. Як правило, для обліку таких факторів застосовувати необхідно складніший клас формування моделей, ніж логіко-імовірнісний, що лежить в основі класичних дерев відмов.…”

Auto Load-Levelling Control of a Large Sprayer Chassis Using the Sliding Mode Method

“…In Eqs. ( 1) to (7), pa is atmospheric pressure and the value is 0.1 MPa; the other unmarked symbols meanings are listed in Tab. During automatic load-levelling, the adjustment range needs to be set in advance, as shown in Fig.…”