To address the problem of a lack accurate parameters in discrete element simulation study machine-picked fresh tea leaf mechanized-sorting process, this used leaves as research object, established models different components EDEM software version 7.0.0. based on bonded particle model using three-dimensional scanning inverse-modeling technology, and calibrated through physical tests virtual tests. Firstly, intrinsic were measured tests; physical-stacking test was conducted cylinder lifting...

The construction practice of water conveyance tunnels often encounters various complex geotechnical engineering conditions, which bring huge challenges to the design and tunnels. Based on theory rock elastic-plastic mechanics finite element analysis technology, this article carried out investigations geological features, formations hydrological conditions establishes a calculation model for 3# tunnel Fenhe River Diversion Project, analyzes variation law surrounding stress displacement during...

<abstract> Wide-narrow row pot seedling transplanting (WPST) could obtain high rice yield and quality. In this study, a new type of mechanism for WPST is designed based on analysis recent advances at home abroad. The mechanism, which consists planetary gear trains with seven noncircular bevel gears, used in an automatic transplanter. working trajectory attitude properties are analyzed according to the agronomy requirements WPST. To establish kinematics, non-uniform B-spline curve fit control...

Due to the influence of temperature changes or gradients in construction process mass concrete, cracks will occur concrete. In order achieve a reasonable prediction change concrete during and accurately obtain trend, this paper attempts construct CART model based on big data processing technology characteristics This introduces detail how use methods such as outlier identification, missing value filling random error elimination improve quality, well method for constructing model, combines...

Highlights A method for solving a spatial transplanting mechanism with noncircular gears is proposed. new rice pot seedlings trajectory small lateral displacement at the preparation phase obtained. The working performance validated by simulations and field tests. Abstract. This study proposes of parameters planetary gear train to meet requirements wide-narrow row seedling (WPST). First, was simplified open-chain 2R (planetary carrier). kinematic model derived from three given homogeneous...

The oxidation property of a Ni-NiMo2B2 alloy which is expected to be new heat resistant-material was investigated. phase relationship the Ni-Mo-B-O system at 973 K determined clarify path from point view thermodynamics. suggested that Ni3B2O6, NiMoO4, MoO3, MoO2, NiO and B2O3 are formed in atmosphere on alloy. Oxidation tests were carried out 773, 1173 K. oxide film surface composed as relationship. very dense appeared protective for alloy, result, resistance excellent.

The effects of addition Cu, Cr and W on the wear resistance bending strength Ni-M3B2 (M=Ni, Cr, Mo, W) two phase alloy were investigated. improved by W. optimum composition was found to be Ni-3.6mass%B-29.3mass%Mo-15mass%Cr-2mass%Cu-18.7mass%W. with superior conventional Ni-based resistant Ni 3mass%B-13.5mass%Cr-4.8mass%Fe-0.8mass%aC. Also, present showed 1.81 GPa. Furthermore, corrosion in 6% HNO3 aqueous solution 10% HCI solution, 70 times 7 higher respectively, than that alloy. Therefore,...

This paper introduces the notion of weak rigidity to characterize a framework by pairwise inner products inter-agent displacements. Compared distance-based rigidity, requires fewer constrained edges in graph determine geometric shape an arbitrarily dimensional space. A necessary and sufficient graphical condition for infinitesimal planar frameworks is derived. As application proposed theory, gradient based control law non-gradient are designed group single-integrator modeled agents stabilize...

Collaborative innovation is a very important way for major scientific innovation; the core adding knowledge value, involving firms, government, research institutions and other organizations. centers are carriers responding to call of government’s collaborative strategy. However, during process, problem intellectual property ownership benefits allocation faced by cooperative parties. So, we try solve constructing reasonable mechanism. It basis steady operation center distribution fairly. This...

<abstract> <b>Abstract.</b> Wide-narrow row pot seedling transplanting (WPST) could result in high grain yield and quality. To meet its requirements, a new type of mechanism for WPST is designed based on the analysis recent advances at home abroad. The consists planetary gear trains with seven noncircular bevel gears, which used automatic rice transplanter. working trajectory attitude properties are analyzed according to agronomy requirements WPST. establish kinematics, non-uniform B-spline...

<b><sc>Abstract. </sc>With the increasing cultivation scale of Camellia oleifera in China, demand for mechanical harvesting machinery is very urgent. fruit has become a bottleneck hindering development tea oil industry. In order to achieve high percentage and low damage flower bud, design scheme using an elliptical trajectory excite tree canopy was proposed. By studying physical properties oleifera, three-dimensional model constructed SolidWorks. The flexibly processed ANSYS, then it...