Arhivă — Seria D

1

ANALYTICAL TIME-DOMAIN SOLUTIONS FOR HYSTERETICALLY DAMPED SDOF OSCILLATOR: CLOSED-FORM EXPRESSIONS AND NON-CAUSALITY ANALYSIS

Loucif BOUZIT, Abdelghani SEGHIR

In this paper, a theoretical analysis of the hysteretically damped SDOF oscillator is presented. Closed-form time domain solutions are obtained analytically. Although the hysteretic model is in agreement with experimental observations since it solves the problem of the frequency dependence of the dissipated energy duri…

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2

CONFIGURATION-SPACE-BASED COLLISION-FREE PATH PLANNING FOR A 4-DOF SERIAL HARVESTING MANIPULATOR USING TWO-LEVEL HIERARCHICAL A* SEARCH

Haixin ZOU, Xiangjun ZOU, Mingxiang GUAN

Collision-free path planning presents challenges for fruit-harvesting robots operating in cluttered workspaces. This paper presents a configuration space (C- space)–based planning framework for a four-degree-of-freedom (4-DOF) serial harvesting manipulator that integrates analytical obstacle modelling with a twolevel A…

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3

SIMULATION ANALYSIS OF AUTOMATIC CUTTING CONTROL FOR ROADHEADERS

Haoran ZHANG, Yonggang LIU, Bo CHEN, Jiyue YANG, Yahang WU, Lei QIN, Longjie LI

In order to achieve the tracking control of the motion trajectory of the cutting head under the vibration interference and improve the cutting efficiency of the roadheader, the kinetic model of the cutting mechanism of the roadheader is established in this paper, and the kinetic equation of the cutting mechanism is est…

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4

ANALYSIS OF THE POSITIONING SYSTEM FOR CONNECTING PANEL FACES OF TROUGH SOLAR COLLECTOR BRACKETS

Lingzhi YAN, Wenbo HUANG, Jiaming WANG, Lanxin HOU, Yonghui LIU, Jianjun WANG

This paper introduces an industrial camera positioning system for the connecting plate surface of a trough solar collector bracket. The system integrates a high-precision industrial camera, an image processing algorithm, and a precision mechanical control mechanism, aiming at realizing the accurate positioning and dete…

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5

KINEMATIC MODELING OF ORIENTATION-ADJUSTING AND VIBRATION-ISOLATING PLATFORM WITH ACTIVE-PASSIVE CLOSED-LOOP FUSION

Mingchao GENG, Yanfeng HAN, Xukun YIN, Tiezheng CUI, Hong MA, Jinfeng WANG, Erwei LI

To address the dual requirements of compensating for large-amplitude pose disturbances and isolating medium-to-high frequency vibrations in vehicle-mounted instruments, a novel parallel platform with active-passive closed-loop fusion is proposed. However, the introduction of closed-loop sub-chains transforms the platfo…

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6

ELECTRIC LOCOMOTIVE BEARING FAULT DIAGNOSIS BASED ON THE SELF-ATTENTION-BASED DEEP NETWORK

Qian TAO, Junxian ZHANG, Yang ZHOU, Qian ZHANG

Accurate fault diagnosis of electric locomotive bearings is critical for railway safety, yet traditional methods relying on signal decomposition and manual feature extraction struggle with noise and complex fault types. To overcome these challenges, this study proposes a self-attention deep network (SADN) framework tha…

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7

THE VERIFICATION METHOD STUDY OF DYNAMIC FLIGHT SIMULATION OF HUMAN CENTRIFUGE

Yifeng LI, Lihui ZHANG, Baohui LI, Cong WANG, Ke JIANG, Minghao YANG, Yi WANG

Dynamic Flight Simulation (DFS) is an important part of human centrifuge. Because the algorithm and program of DFS system are generally opaque to users, it is complicated and difficult to evaluate its reliability and consistency directly from the system itself. In the paper, first the three methods to evaluate simulati…

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8

COMPARATIVE STUDY ON PROTECTIVE PERFORMANCE AND MATERIAL OPTIMIZATION OF AUTOMOBILE BUMPERS UNDER DIFFERENT COLLISION CONDITIONS

Yanling ZHAO, Kai KANG, Jiaqing ZHANG, Junchao LI

Improving the collision safety of automotive bumpers under low-speed conditions is a crucial research topic in vehicle safety. This paper studies the collision energy absorption characteristics of bumpers under three working conditions, namely 100% frontal collision, offset collision and 60° angled collision. Meanwhile…

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9

TOWARDS SYNERGISTIC ENERGY EFFICIENCY AND STABILITY IN MULTI-OBJECTIVE OPTIMIZED STEAM PRESSURE CONTROL SYSTEMS

Xiaolin GAO, Jing LU, Wenhao SHAO, Xiangmao YU, Xi CHEN, Zhihong HUANG

This paper addresses the problem of the difficulty in achieving coordinated optimization of energy efficiency and stability in the steam pressure control of industrial boilers. It proposes a collaborative control strategy based on multiobjective optimization. By constructing a stability objective function measured by t…

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10

RESEARCH ON MATHEMATICAL MODEL AND EXPERIMENT OF INTERNAL GEAR BY POWER SKIVING

Longlong GENG, Xingzhao CHEN, Zhengyang HAN, Chuang JIANG

In order to meet the large demand of internal gears for new energy vehicles and solve the efficient processing problems, a method to machine internal gear by power skiving is put forward. The principle of power skiving to internal gear was analyzed, and mathematical model was established. Then the tooth surface equatio…

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11

THE SOLUTION TO FIXED END FORCE OF PRISMATIC MEMBERS WITH BIMODULUS AND EQUAL SECTION

Yangjun MENG, Can LI

This research advances the engineering application of bimodular materials by developing a program for calculating the geometric characteristics of any cross-section, utilizing bimodular theory and a binary iterative method. Additionally, a method for computing fixed-end forces in prismatic, uniform cross-section bimodu…

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12

COMPARATIVE ASSESSMENT OF DEFORMING ELEMENTS IN COLD HARDENING OF INTERNAL CYLINDRICAL SURFACES USING TOPSIS

Cosmin-Gabriel GRĂDINARU, Razvan-Nicolae MITITELU, Vlada ȚISARI, Gheorghe NAGÎȚ & Vasile ERMOLAI

Cold hardening represents a fundamental component of industrial engineering, with a solid historical evolution and strong contemporary technological relevance and being widely applied across various fields. An important aspect of this technology is the processing of internal cylindrical surfaces, an area that requires …

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13

STUDY ON COAL FAILURE MECHANISM AND DEFORMATION EVOLUTION OF COAL UNDER IMPACT

Qi LI, Guorui FENG, Zhen LI, Zhiwei ZHAI, Lingyun ZHANG

In order to analyze the deformation characteristics and mechanical properties of coal under impact load, Brazilian disc splitting test was carried out on coal samples by using split Hopkinson pressure bar and high-speed camera, and the displacement field, strain field and fracture characteristics of coal were quantitat…

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14

PERFORMANCE ANALYSIS OF CASHEW NUT SHELL LIQUID–BASED HYBRID NANOFLUIDS FOR SUSTAINABLE MQL MACHINING OF EN-24 STEEL

Sachin K. PATIL, Pratik A. PATIL, Abhijeet P. DIVATE

Sustainable machining demands metalworking fluids that minimize environmental hazards while maintaining surface integrity and tool life. In this study, a biodegradable hybrid nanofluid was developed using cashew nut shell liquid (CNSL) as the base oil blended with Al₂O₃, multi-walled carbon nanotubes (MWCNT), and graph…

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15

ANALYSIS OF TECHNOLOGICAL REGIMES OF OPEN-DIE FORGING WITH MODEL DEVELOPMENT FOR DIGITAL SYSTEMS OF METALLURGICAL PRODUCTION

Volodymyr KUKHAR, Elena BALALAYEVA, Hlib KHLIESTOV, Olha KHLIESTOVA, Sergiu MAZURU

Contemporary metallurgy requires the efficient production of large-scale components by open-die forging. The paper analyzes the influence of technological parameters (relative bite infeed and relative reduction per pass) on the kinematic (relative elongation) and energy-force (reduced force and reduced work) characteri…

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16

EFFECT OF SURFACE ROUGHNESS ON FRETTING WEAR BEHAVIOR OF CERAMIC COATINGS: A FINITE ELEMENT ANALYSIS

Yujie CHENG, Mu YANG, Chong SU

This study investigates the effects and mechanisms of surface roughness on the fretting wear process of ceramic coatings under full slip conditions. The uniform random perturbation is used to build ceramic coating surfaces of varying roughness and we design a finite element model. The fretting wore under an 80N and dis…

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17

ORDERING THE INFLUENCING FACTORS OF THE 3D PRINTING PROCESS USING THE RANK CORRELATION METHOD

Vlada ȚISARI, Oana DODUN, Gheorghe NAGÎȚ, Andrei Marius MIHALACHE, Margareta COTEAȚĂ, Roxana-Gabriela HOBJÂLA, Laurențiu SLĂTINEANU

For the development of experimental research on the Fused Deposition Modeling (FDM) process, a critical preliminary step is the selection of input factors whose variation significantly influences the output parameters. Given the inherently large number of potential factors in FDM, a method for narrowing down this set t…

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18

POWER SIMULATION OF EXTENDED-RANGE ELECTRIC TRACTOR BASED ON ADVISOR

Huisong GAO, Zhongxi ZHOU, Yangyang CAI, Jinlin XUE, Lianglong HU

A simulation model of an extended-range electric tractor based on ADVISOR software is developed to study its related indicators (such as power). The working mode of the extended-range electric tractors is analyzed and a simulation model suitable for the extended-range electric tractors is developed based on ADVISOR sof…

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19

RESEARCH ON THE DESIGN OF MULTIFUNCTIONAL AUTOMATIC SPINACH HARVESTING MECHANICAL DEVICE BASED ON SOIL SHAKING TYPE

Jiali WANG, Degang KONG, Zhiyi WANG, Zhaoxing LI, Xuanjia LI, Songyuan LENG

This study targets the key challenges in current spinach harvesting, including low mechanical efficiency, high labor costs, and poor cleanliness. To address these issues, a multifunctional automatic soil-shaking spinach harvester is designed, integrating automatic cutting, soil shaking and cleaning, transportation, col…

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20

DESIGN OF FLEXIBLE PIEZORESISTIVE SENSOR BASED ON CARBON BLACK-SILICON MATRIX COMPOSITE MATERIAL

Tianhao JING, Kexin XU, Xinhui SUI, Ronghao LI, Yulong CHEN, Yuhong YAN

At present, characteristics such as high sensitivity, cycling stability, and fast response remain the pursuit of high-performance flexible piezoresistive sensors. However, due to the limitations of the mechanical properties of the material itself, it is difficult to significantly improve the sensing performance by simp…

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21

TOWARDS A CONCEPTUAL MODEL FOR THE PRODUCT CONFORMITY ASSESSMENT

Dragoș ILIESCU

The conformity assessment represents an important part of product design and manufacturing. The domain is of a continuous interest, so that today we can notice a conformity assessment industry existence. The present research contributes by development of a conceptual model for the conformity concept. Concepts, entities…

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22

DESIGN AND TESTING OF THE SEED CONVEYING SYSTEM FOR EDIBLE SUNFLOWER COMBINE HARVESTER

Guodang LIAN, Tengfei SUN, Xiao MA, Ruicheng FENG, Chaobin ZHOU, Wangyuan ZONG, Yanlin WANG

Based on the overall structural layout of the 4KHZ-330 edible sunflower combine harvester, a combined screw-pneumatic seed conveying system was designed to minimize contact and impact between seeds and rigid components, thereby reducing seed damage during conveying on the premise of ensuring efficient and stable transp…

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