In order to establish a Discrete Element Method (DEM) model of soil particles, the in laboratory bin was used as research object. The texture determined be sandy loam by sieving, and shape particles analyzed an image particle analyzer geometric particles. Edinburgh Elasto-Plastic Adhesion (EEPA) chosen contact for simulation analysis, accuracy selection tests. parameters played crucial role results simulation. Test methods were obtain that easy measure. For could not measured model, direct...

After existing ultra-deep vertical rotary tillers work in sugarcane stubble fields, the chopping performance is poor, and reason for this unknown. To solve this, paper develops a simulation model of tillage (UDVRT) field using FEM-SPH coupling method physical testing. The used to investigate process mechanism UDVRT cutter, identifying causes inadequate effectiveness. results show that, when comparing with test, magnitude variation cutter’s torque curves are relatively consistent, relative...

Establishing an accurate high-moisture corn ear fragmentation model using the Discrete Element Method is crucial for studying processing and of ears. This study focuses on ears during early harvest stage, developing a fragmentable calibrating its bonding parameters. First, based Hertz–Mindlin method in Method, three-layer cob consisting pith, woody ring structure, glume was established. Through combined experimental simulation calibration approach, parameters were determined Plackett–Burman...

Deep vertical rotary tillage (DVRT) is a new method which combines the advantages of deep and tillage. However, limited research has been conducted on critical component tiller, namely spiral cutter. In clay loam, there are lot large clods in topsoil layer after tillage, cutting resistance vibration cutter substantial. To reveal reasons behind this, simulation model cutter–soil system was developed using Smoothed Particle Hydrodynamics (SPH). Using this model, working process force were...

Accurate simulation of the continuous icebreaking process in level ice is crucial for design icebreakers.The crushing and bending failures sheet, as well rotating, sliding accumulating cusps broken from sheet constitute a complex system process.In this paper, cohesive element method combined with an elastoplastic softening constitutive model to simulate ice.Firstly, modelling local calibrated by simulating cone tests.Three different laws are proposed their effects on results evaluated...

In ice-infested waters, propellers of a polar ship are likely to be exposed ice loads in different scenarios.Propeller milling with is one the most dangerous cases for icepropeller interaction.In this study, we try simulate dynamic process and reproduce resulting physical phenomena.Cohesive element method used model simulation.To material properties ice, an elastoplastic softening constitutive law developed.Both crushing fracture failures included process.The 6 Dofs acting on blades...

Abstract Explosion containment vessels (ECVs) are important equipment used for underwater explosion experiment research. In this paper, a method is proposed to improve the blast resistance of ECV by placing it in water medium. The shock response caused spherical studied. single-layer thin-walled vessel shell submerged an infinite domain medium deduced and simplified as single-degree-of-freedom elastic vibration system with viscous damping. wave exponential loading, analytical solutions...

Cassava is one of the world's top three tuber crops, and its harvesting mechanization level low. Digging-pulling cassava harvester main research direction harvesters. However, soil-loosening components existing digging-pulling harvesters have poor loosening effect, high damage rate, large pulling force tubers after loosening. The two-sided shovel that digs loosens soil on both sides has low working resistance not easy to tubers, but there are few reports impact operating performance....

摘要: 针对种植于红粘土的木薯块根挖掘作业,采用有限元法(Finite element method, FEM)和光滑粒子流体动力学(Smoothed particle hydrodynamics,...

Based on the methods including modified Mohr-Coulomb yield criterion, Lagrange and smoothed particle hydrodynamics (SPH), digging shovel - stem root soil system dynamics simulation model is established by ANSYS/ LS-DYNA. According to model, interaction mechanisms among shovel, are discovered, processes of shearing changing root's stress analyzed. The shovel's loosening discovered. process deformation, fracture micro level studied. results show that (1) main reasons for in operation wedge...

A test system based on 485 network is designed and built, with the industrial control computer PC as unit.It implements on-board miniaturization, intelligent unmanned, distributed networked of metro vehicle brake disc temperature rise.Meanwhile, personal can receive data collected by through serial port.Industrial software are using LABVIEW graphical language.In case long unattended, automatically completely saves rise data.Personal PC, at same time, has access to historical saved local area...

Chongqing Chaotianmen Bridge is by far the world's largest three-span continuous half-through double-layer steel truss tied arch bridge. Risk evaluation and risk analysis are made to bridge during construction period. At same time, various measures taken avoid risks accidents. The principal line of controls clear with reasonable control measures. was completed available for traffic on April 29, 2009, its technical quality indicators in accordance design specifications.

This paper presents an approach for numerical optimization design of blade stacking line fan/compressor blade. In the present method, linear interpolation method and Constant-Volume Tetrahedron are developed to exchange data between a Navier–Stokes equation solver which is adopted evaluate aerodynamic performance commercial software used attain structural characteristics. Both those two have been demonstrates. A simple Genetic Algorithm as robust tool employed achieve multi-objective...

Because sampling the surface soil appears loose and fracture of easily, elastic modulus in tillage layer was difficulty measuring directly by physical tests. The dynamic simulation model cone-air-soil system established. multi-material ALE (Arbitrary Lagrangian-Eulerian) fluid-structure interaction method used model. Based on model, reversed. Meanwhile, reverse physically verified triaxial test. results show that inverse is feasible. error 0.65% compared with obtained numerical has higher precision.

This article presents an experimental investigation on the bending capacity of steel-concrete composite truss girder (SCCTG). Four full-scale specimens named CB1, CB2a, CB2b and CB3 respectively, are tested numerical analyzed. Stress distribution, load-displacement relationship, load-slip relationship ultimate SCCTGs investigated. The results show that SCCTG follows plane section assumption whole. has a higher bearing good performance deformation. Concrete slab steel can work together better...

The seeder of rice bud-seed for field seedling raising is a new equipment raising, which complicated vibration system with multi-freedom. And the effect parameters and interactions on velocity at different locations moving rail two electromagnetic metering devices are installed side by large, passing rate seeding affected. In this paper, virtual prototype established ANSYS ADAMS. developed to carry out dynamics simulation using four-factor quadratic regression orthogonal rotary combination...