Arhivă — Seria D

1

ULTRASONIC ACOUSTIC FIELD HOMOGENEITY IN THE NEAR FIELD OF TRANSDUCERS

Liliana GHEGOIU, Cristian-Cătălin PETRE, Mihai Valentin PREDOI

Ultrasonic longitudinal-wave transducers (LWTs) are widely employed across a broad range of scientific and technological applications. Despite their critical role in the characterization of nanoparticle suspensions, the acoustic behavior within their near-field region remains insufficiently explored in existing literat…

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2

DEVELOPMENT AND SIMULATION OF THE PATH TRACKING CONTROL SYSTEM FOR COMBINE HARVESTERS BASED ON MPC

Xiaolian LÜ, Jialong TANG, Qian LI, Ruijuan SU, Xiaorong LÜ

To improve the path tracking accuracy and stability of the harvester, a method based on Model Predictive Control (MPC) was proposed and simulation tests were carried out. The overall framework of the system was designed, the kinematic modeling was completed, the control constraints were determined, and the MPC controll…

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3

DYNAMIC PARAMETER ANALYSIS AND STRUCTURAL DESIGN OF A PENDULUM-DRIVEN SPHERICAL ROBOT FOR PIPELINE INSPECTION

Yue CUI, Fangyuan MAO, Silin LAN, Nan LIN, Huijie HAN, Yifan SUN

The spherical robot, characterized by its simple mechanical structure, agile steering, and robust autonomous control capability, holds promising potential for industrial pipeline inspection. This study focuses on the analysis of dynamic parameters and the structural design of a pendulum-driven spherical robot. By exami…

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4

A JERK-OPTIMAL MOTION PLANNING METHOD FOR ROBOTIC SYSTEMS

Florinel LUPU, Sorin NEGROIU

The paper presents an original method for jerk-optimal motion planning in robotic systems, where smooth motion and controlled dynamic loads are essential. By minimizing the overall jerk, the proposed approach enhances dynamic performance, reduces mechanical wear, and increases operational safety. Motion profiles are ge…

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5

PATH PLANNING FOR AUTOMATIC PARKING OF TRACTOR-TRAILER VEHICLES BASED ON BEZIER AND B- SPLINE CURVE MODELS

Fan LAI, Rui ZHU, Shanqiu CHEN, Shibo BIN, Yongfei HAN, Zhao'an LIN, Liman WEI

To address the challenges in path planning for automatic parking of tractor- trailer vehicles— such as complex trajectories, unstable path quality, and high modeling requirements—this study conducts a comparative analysis of Bezier and B- spline curve models under obstacle-free point-target parking scenarios. Performan…

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6

DESIGN AND OPTIMIZATION OF THE MECHANICAL ARM OF THE ARTICULATED SUGARCANE HARVESTER

Jingping LU, Chen DENG, Wukai FENG

The articulated sugarcane harvester is a novel harvesting device designed to mimic the manual cutting process. In this system, a mechanical arm replaces the human arm, with a gripping device and a cutting device mounted at its end for holding and cutting sugarcane, respectively. The configuration of the articulated arm…

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7

TIME-OPTIMAL CONTROL OF THE MOVEMENT OF CRANE SYSTEMS “TROLLEY-LOAD”

Viatcheslav LOVEIKIN, Yuriy ROMASEVYCH, Vsevolod STRYZHAK

This paper proposes a general methodology for solving the time-optimal control problem of a “trolley–load” dynamic system for overhead and gantry cranes. An original control law parameterization based on an auxiliary function is introduced, that allows determining switching instants of the drive and reducing the optima…

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8

ANALYSIS OF THE PENETRATION CAPABILITY OF KINETIC PROJECTILE WITH SEMI-ANALYTICAL AND EMPIRICAL RELATIONSHIPS

Vasile NASTASESCU, Mihaela Cristiana BADEA, Anton HADAR, Daniela-Ioana TUDOSE

The paper contains a synthesis of analytical, semi-analytical and empirical relations used in terminal ballistics, as well as some of their applications for a case studied experimentally and numerically. The novelty of this article consists in the presentation of an original semi-analytical relation, called the BMC For…

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9

NUMERICAL SIMULATION OF LONGITUDINAL DISTURBANCE ON DIESEL JET ATOMIZATION

Huan LI, Rujun WU, Cen SUN

The study used large eddy simulation (LES), volume of fluid-to-discrete phase model (VOF-TO-DPM), and adaptive methods to simulate diesel jet atomization in high-speed cross flow and validated the model. The liquid column underwent secondary fragmentation, producing a large number of droplets. Under sinusoidal nozzle d…

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10

NUMERICAL SIMULATION RESEARCH ON EFFICIENT DUST CAPTURE OF BLAST FURNACE TAP HOLE

Lili WANG, Wei WANG, Ran LI, Guangkuo HE, Haibin KE

The traditional fixed dust collection hoods for blast furnace tap holes rely solely on passive negative pressure for dust capture, with limited suction capacity. The on-site dust removal efficiency is only 60%~70%. The overflowing dust seriously endangers workers’ health and pollutes environment. This article designs a…

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11

EXPERIMENTAL INVESTIGATION ON THE EFFECTS OF PERFORATIONS AND EXTENSIONS ON THE HEAT DISSIPATION PERFORMANCE OF FINS

Anuradha JATHAR, Abhijeet P. SHAH, Ajinkya PATIL

Natural convection cooling plays a critical role in improving the thermal performance and service life of passive heat-dissipating systems. This study experimentally investigates the influence of fin extensions of different geometries (rectangular, trapezoidal, and triangular) and circular perforations of varying diame…

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12

CFD ANALYSIS OF THE WIND INFLUENCE ON A SMALL CONSTRUCTION CRANE CARRYING WORKLOAD

Ilir DOÇI, Shkelzen SHABANI, Halil DEMOLLI

This research analyzes the effects of lateral wind loading on a small construction crane operating in an open environment. During operation, the crane is subjected to wind forces with varying direction and intensity. A CFD analysis was performed using COMSOL Multiphysics, with the crane model including its main structu…

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13

COMPARATIVE STUDY OF HIFU/MWA HEAT DOSE FORMATION MECHANISM BASED ON ARRHENIUS DAMAGE INTEGRAL AND POROUS MEDIA HEAT FLOW COUPLING MODEL

Hu DONG, Gang LIU, Gaofeng PENG

This study compares thermal dose formation mechanisms between high- intensity focused ultrasound (HIFU) and microwave ablation (MWA) using a coupled Arrhenius-Brinkman porous media model. For HIFU, a parameterized intensity-dependent equivalent absorption model captures nonlinear effects (shock wave formation), yieldin…

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14

RESEARCH ON ELECTRICAL DISCHARGE MACHINING (EDM) ROUGHENING PROCESS BASED ON SURFACE ELECTROMAGNETIC SHIELDING PERFORMANCE

Dong CAI, Wenming DENG, Qianxing HUANG

According to the absorption mechanism of surface morphology in electric discharge machining, the absorption characteristics of different surface morphologies are different, that is, the electromagnetic shielding effect is different. The main factor affecting the morphology characteristics of the surface is the processi…

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15

NUMERICAL SIMULATION AND EXPERIMENTAL STUDY ON RIVETING FORMING OF CARBON FIBER COMPOSITE MATERIALS IN RAIL VEHICLE CARBODIES

Changshun YOU, Chunliang NIU, Hong GE,Yingfeng SHI, Bingzhuo LIU, Liming GUO, Ziqian MIN, Shuqi WANG, Chunfei BAI

To improve the rationality of riveted structural design for carbon fiber compo- site materials in complex engineering products, this study investigates blind riveting connections between carbon fiber composite plates. The forming characteristics and mechanical properties of the riveted joints were obtained through nume…

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16

INVESTIGATING LESS-EXPLORED FACTORS INFLUENCING ACCURACY IN MEX AND MSLA ADDITIVE MANUFACTURING PROCESSES

Diana POPESCU , Mariana Cristiana IACOB

This study was focused on investigating the dimensional accuracy of parts produced by two low-cost additive manufacturing processes, namely Masked Stereolithography (MSLA) and Material Extrusion (MEX). The analyzed factors were filament moisture, belt tension, build orientation, exposure time, and lift speed. A benchma…

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17

OBSERVATIONS ON THE DESIGN OF MANUFACTURING TECHNOLOGY USING ARTIFICIAL INTELLIGENCE

Laurențiu SLĂTINEANU, Margareta COTEAȚĂ, Oana DODUN , Gheorghe NAGÎȚ, Andrei Marius MIHALACHE 5, Marian GHEORGHE, Vlada ȚISARI

The emergence and development of artificial intelligence programs led to the formulation of a question regarding the possibilities of using these programs, including for the design of manufacturing technologies. Such a problem is of interest both for industrial practice and for the training activities of future special…

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18

MODAL ANALYSIS AND STRUCTURAL STRENGTH EVALUATION OF KEY COMPONENTS IN ROLLING MILL MAIN DRIVE SYSTEM UNDER INSTABILITY CONDITIONS

Ran LI, Chongyi GAO, Aoyun WANG

As an important device for transmitting motion and torque, the running stability and structural reliability of the rolling mill’s main drive system have a crucial impact on productivity and products quality during the rolling process. The numerical simulation on instability mode of the main drive system of rolling mill…

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19

EVALUATION DE LA QUALITE DE SURFACE EN TOURNAGE DUR DE L'ACIER 42CrMo4 EN UTILISANT LA METHODOLOGIE DE TAGUCHI

Youcef ABIDI, Nacer MOKAS, Mohamed DJEMANA, Djallel KERDOUN

La rugosité de surface est le plus important paramètre technologique qui est recommandé par la fabrication, car elle permet d'évaluer la qualité du produit. Et pour atteindre les niveaux de qualité souhaités, il est crucial d’analyser l'impact des conditions d'usinage sur la rugosité de surface de pièces. Dans ce trava…

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20

BI-OBJECTIVE OPTIMIZATION APPROACH IN FLAT-END MILLING BASED ON GENETIC ALGORITHM AND FUZZY DESIRABILITY FUNCTION

Abdelfettah CHIBOUT, Nasreddine ZEROUDI, Malek HABAK

Rough end milling of AA7175-T7351 requires balancing productivity and tool loading. We present a bi-objective framework that integrates NSGA-II with a fuzzy desirability function to select cutting conditions from the Pareto set. Cutting speed (Vc), feed per revolution (fn), axial depth (ap) and radial depth (ae) were s…

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21

COMPARATIVE STUDY ON THE CRASHWORTHINESS OF BUMPER BEAMS FOR NEW ENERGY VEHICLES: FINITE ELEMENT ANALYSIS OF STRUCTURAL STEEL AND ALUMINUM ALLOY

Zhenxing WANG, Donghao WU，Lijuan LIU

This study focuses on the core energy-absorbing component—bumper beam and front longeron assembly—aiming to fill the gap of insufficient systematic comparison between structural steel and aluminum alloy under multi-collision conditions. Using UG NX10.0 for modeling, HyperMesh for meshing, and LS-Dyna for simulation, co…

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22

MECHANICAL BEHAVIOR OF FLAX FIBER-REINFORCED EPOXY COMPOSITES UNDER TENSILE LOADING

Anca-Loredana DECA, Anton HADĂR, Constantin STOCHIOIU, Florin BACIU

The mechanical behavior of a flax fiber - epoxy resin composite laminate is investigated in the current paper. Rectangular specimens, with 0°, ±45°, and 90° laminate orientations with respect to the loading direction, were subjected to tensile testing up to failure. Strain measurement was performed using Digital Image …

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23

LIGHTWEIGHT DESIGN RESEARCH ON COMPOSITE FRAME OF ORCHARD CRAWLER VEHICLE BASED ON INTELLIGENT OPTIMIZATION METHOD

Dongwen GUO, Hongxian WANG, Jialin WANG, Weigang XUE, Xiaoguo WANG

The double-layer composite frame of the new multifunctional orchard crawler vehicle has problems of excessive weight and strength redundancy, which affect operational mobility and energy efficiency. This study carried out 3D modeling and finite element analysis, selected 10 key parameters, and conducted parameter optim…

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