A secondary seeding precision double-seed peanut hole seed metering device was designed to improve the performance of planting equipment and provide a solution for problems on high charge that can cause poor cavitation uniformity easily. The main structure operation parameters in terms groove length, height, seed-bed belt speed, rotation speed wheel were determined through theoretical analysis....

the main design criteria of ballasted railway tracks include rail deflections, rail bending stresses, rail wheel contact stresses, sleeper bending moments and ballast sleeper contact pressures. numerous criteria have been defined for the design of ballasted railway tracks owing to the various mechanical properties of track components and their complex interaction. therefore, railway track desig...

in this study an innovatively designed tractor-mounted, ground-wheel driven, triple unit, row crop precision planter capable of planting three rows of garlic (allium sativum l.) cloves on each raised bed was designed, fabricated and tested. the major components of this planter include; chassis and transport wheels, lister-bedder unit, seed hopper, seed metering drum, sweeper, knocker, seed tube...

In this paper, the membrane effect of geogrid reinforcement was investigated based on numerical simulation to understand serviceability and deformation highway piled embankments under moving vehicle loads. The in low (i.e., ratio embankment height pile spacing is less than 1.5) clearly emphasized. It has been found that maximum settlement occurs central area between piles, tension concentrated ...

The accuracy and real-time performance of the speed measurement method were important factors influencing seeding spacing monitoring. In this study, three different methods (including GNSS (Global Navigation Satellite System) receiver measurement, radar encoder rotation speed) used to compare analyze monitoring results spacing. same system was calculate under methods. directly measured disc ins...

Inverted magnetorheological (MR) polishing device mainly use a magnetic sealing ring to collect fluid. This collection method wears the wheel surface of wheel, affects accuracy and introduces machining error. In order reduce this wear improve recovery efficiency, new type collector using an air seal is proposed in paper. Furthermore, testing six factors three-level orthogonal test table used st...

This paper investigates various aspects of the structural behavior of doweled joints, including load transfer, in rigid airport pavement systems using nonlinear three–dimensional finite element methods. The finite element models include two concrete slab segments with dowels connecting them. The concrete slab and supporting layers are simulated by continuum solid elements to enhance the accurac...

The mechanized sowing operation of corn breeding can improve test accuracy and efficiency speed up the process. In view problems low flexibility, high price, poor quality current seeder in experiments, critical components a hand-pushing plot precision planter were optimized. Through analysis relative motion between seed hole seed-metering wheel, diameter range depth wheel determined as 13~19 mm...

The main design criteria of ballasted railway tracks include rail deflections, rail bending stresses, rail wheel contact stresses, sleeper bending moments and ballast sleeper contact pressures. Numerous criteria have been defined for the design of ballasted railway tracks owing to the various mechanical properties of track components and their complex interaction. Therefore, railway track desig...

Abstract This paper proposes a new online calibration method for the differential-drive mobile robot equipped with laser scanner. Our algorithm can jointly estimate 3-DoF extrinsic parameters of scanner and intrinsic (radii wheel spacing) kinematic model. Applying pre-integration theory initially developed IMU sensor to model, we adopt iterative nonlinear optimization minimize cost derived from...