farm machinery managers often need to make complex economic decisions on machinery replacement. repair and maintenance costs can have significant impacts on this economic decision. the farm manager must be able to predict farm machinery repair and maintenance costs. this study aimed to identify a regression model that can adequately represent the repair and maintenance costs in terms of machine...

The purpose of the research was to determine influence selected factors on average degree coverage and uniformity liquid spray using single dual flat fan nozzles. impact nozzle type, pressure, driving speed, angle unevenness coefficient were studied. conducted with special track machinery designed constructed control change boom height, angle, pressure. Based results, it found that highest obta...

The generation of synthetic vibration signals enables the testing novel machine diagnostic methods without costly introduction real failures. One major goals vibration-based condition monitoring is early detection bearing faults. This paper presents a modeling technique based on combination known mechanical properties modeled object (phenomenological part) and observation (behavioral part). mod...

in this paper the use of farm machinery in sugar beet farms in farsprovince was studied. the necessary data, with two-stage cluster sampling method in fasa, eghlid and darab cities on 2004- 2005 were collected. from 203 farmers selected for the study. 113 of them were in high level mechanization group and 90 of them were in low level mechanization group. in this study, the effect of farm machin...

With the improvement of complexity and reliability mechanical equipment, it has been difficult for commonly used variational modal decomposition method vibration signal rotating machinery to meet current practical engineering requirements. In order further improve adaptability, processing efficiency, robustness fault diagnosis methods, a collaborative hybrid element heuristic multiobjective opt...

The harmonic response caused by unbalanced excitation vibration for the high-speed rotating machinery will reduce control accuracy and stability of maglev motor, limit increase its speed. When active magnetic bearing is used to solve vibration, it additional electromagnetic force energy consumption, sometimes leading saturation power amplifier, transfer foundation, causing foundation vibrate. I...

High-speed solid-rotor induction machines (HSIMs) are popular within high-speed (HS) applications because of their high rotor structural integrity and fairly well-established manufacturing process guaranteeing quality series products. Designing a new HS electric machine requires multidisciplinary team to accomplish the performance desired. In case design, components applied materials often reac...

To date, elliptical gear has been commonly used in automobile, automatic machinery, pumps, flow meters and printing presses for its particular non-uniform rotation. However, the dynamic characteristics of elliptical gears have not been clarified yet. In this study, The calculation as well as the experiment of two elliptical gears, which are a single elliptical gear and a double elliptical gear,...

this study was conducted to compare the methods of seed bedpreparation in rangelands of khash region in sistan and baluchestan province iniran. a split plot design was conducted based on randomized complete blockdesign with three replications in 1999. five seed bed preparation methods wereused as main plot as: 1) seed sown by passing livestock. 2) seed sown machinery.3) seeds sown as drilled in...

This paper presents a path tracking algorithm based on fuzzy control pure model for autonomous navigation of 4WS agricultural machines. The aim this research is to implement unmanned machinery and solve the problem difficult determination forward-looking distances in algorithms. By using controller, converts heading deviation lateral one cycle into sum as first input controller vehicle travel s...