bluuebunny/crossref_metadata_2025_split huggingface dataset:
LGMA-DRSN: a lightweight convex global multi-attention deep residual shrinkage network for fault diagnosis
Authors: Zhang Zhijin , Zhang Chunlei , Chen Lei , Li He , Han Ping 
Published: July 2023

Abstract
Recently, the fault diagnosis domain has witnessed a surge in the popularity of the deep residual shrinkage network (DRSN) due to its robust denoising capabilities. In our previous research, an enhanced version of DRSN named global multi-attention DRSN (GMA-DRSN) is introduced to augment the feature extraction proficiency of DRSN specifically for noised vibration signals. However, the utilization of multiple attention structures in GMA-DRSN leads to an escalation in the computational complexity of the network, which may pose practical deployment challenges. To address this limitation, this paper proposes a lightweight variant of GMA-DRSN, referred to as lightweight convex global multi-attention deep residual shrinkage network (LGMA-DRSN), building upon our prior work. Firstly, the numerical variation regularity of the adaptive inferred slope parameters in the global parametric rectifier linear unit is analyzed, where we surprisingly find that a convex parameter combination always occurs in pairs. Based on this convex regularity, the sub-network structure of the adaptive inferred slope with attention mechanism is optimized, which greatly reduces the computational complexity compared to our previous work. Finally, the experimental outcomes demonstrate that LGMA-DRSN not only enhances diagnostic efficiency, but also ensures a high level of diagnostic accuracy in the presence of noise interference, when compared with our prior work.
Laser ranging method based on dual-threshold echo pulse prediction and correction
Authors: Liu Zijian , Tao Min , Yu Qi , Song Junfeng , Gao Zhen , Su Gang , Wang Ziming , Li Chengming 
Published: July 2023

Abstract
In order to improve the accuracy of pulse laser ranging based on time-of-flight (TOF), this paper proposes a laser ranging method based on double threshold echo pulse prediction correction. By using two high-speed comparators with different thresholds to detect the pulse-echo signal, the initial TOF, pulse width, and edge rate can be obtained. These three parameters are combined with statistical functions to accurately predict the peak position of the echo pulse and obtain the corrected TOF. Finally, the accurate measurement distance is calculated. In the aspect of improving ranging accuracy, this method overcomes the shortcoming that the traditional TOF pulse laser rangefinder has large errors in measuring targets with different reflectivity. This method only uses two high-speed comparators and a monostable trigger more than traditional TOF laser ranging systems. Adding these simple circuits can greatly improve the accuracy of laser ranging. The system structure is simple and the cost is low. Experimental results show that this method can achieve accurate distance measurement, and the measurement error is significantly reduced. This method can greatly improve the performance of the TOF laser rangefinder.
Research on bolt looseness monitoring based on electromechanical impedance transmissibility technology
Authors: Yu Hui , Guo Chenguang , Li Nanqi , Lu Shengdong 
Published: July 2023

Abstract
Centralized damage, such as bolt looseness, is one of the most common types of damage in bridge structures. Thus, early detection of such damage is essential for bridge maintenance. Detection methods based on transmittance functions (TFs) have been widely studied. These functions use a T matrix to calculate damage indicators and reflect changes in dynamic parameters, such as natural structural frequencies. However, existing research has shown that the excitation position significantly impacts the T matrix. Therefore, this study proposes a new method based on electromechanical impedance (EMI) for local damage characterization, namely, EMI-TF. A series of comparative tests shows that the EMI-TF process is more sensitive and accurate than the traditional TFs. In addition, the sensitivity of the EMI-TF and EMI methods is compared. Results show that using EMI-TF technology can achieve the localization of minor damage at lower frequencies, which, to some extent, overcomes the limitations of the traditional EMI method that can only detect minor damage at high frequencies. The repeatability of EMI-TF is also studied separately in experiments, with ten repeated experiments conducted. Results show that the experimental results of EMI-TF have high repeatability.
Synchronization in the two networks-frustrated coupled oscillators with a noisy attractive-repulsive frequencies
Authors: Yasmine Benmesbah , Li Yongge , Jia Wantao , Xu Yong 
Published: July 2023

Abstract
We investigate the correlation effects of the two networks combined with an attractive-repulsive frequency altered by noise on the mutual synchronization of the two coupled Kuramoto models with parametric random phase-shift properties. The necessity and significance of collective behavior between ensembles of interacting oscillators and their rich phenomenology offer an idealization of several disciplines in which mutual synchronization competes with force. In this paper, we derive the phase-locked states and identify the significant synchronization transition points analytically with exact boundary conditions for the correlated and uncorrelated joint distributions, their stability, and bifurcation diagrams. We find that a perfect and imperfect supercritical to subcritical Hopf bifurcation transition occurs depending on the synchronic transition points for the correlated cases, characterized by the power scales and the largest eigenvalues of the networks. Moreover, we show the powerful interplay of force, noise, frustration, and network on the synchronization transitions of the two populations and their compromise between the correlated and uncorrelated joint probability distributions. The intensity and transmissibility of noise, in particular, vary within and between populations.
Research regarding water and methanol injection upon the physical parameters of emissions’ concentration values on a compression ignition engine
Authors: Suciu C C , Igreţ S V , Ionel I 
Published: July 2023

Abstract
The objective of this paper is to investigate the possibility of lowering pollution and improving the characteristics of a compression ignition engine for both stand-alone and hybrid-electric powered vehicles. Due to the necessity for lowering the output of nitrogen oxides and carbon monoxide emissions concentrations on compression ignition engines, the research focuses on the addition of water injection. A benefit is the active cooling of the combustion to increase the boost pressure is revealed. Ignition timing can be increased to higher values, safety, without exposing the engine to higher thermal load. Specific fuel consumption is also decreased due to the lower value of the existing and final attested by the exhaust gas temperature.
The importance of the metal reinforcement of low voltage cables in the process of identifying defects
Authors: Predus M F , Muscai C M , Popescu C , Hatiegan C 
Published: July 2023

Abstract
Regarding the identification of defect in the electrical energy cables, in exploatation, usual or high-performance methods are used, based in particular on the phenomenon of reflection and refraction of the impulse transmitted in the cable, phenomenon generated by the impedance change at the defect location. In order to identify the defect, an important role is played by the existence of a current path on the cable route between the ends of the electrical cable and the place where the defect occurred. In the case of low voltage cables, there are situations where, following the sleeve process the continuity of the mechanical protection armature of the steel strip or the copper screen has not been restored. To measure the distance to the defect location, location equipment uses low and high voltage pulses which moves to the defect site with a certain speed and which is repeated after a selected time interval. These impulses are transmitted to the location of the defect at one end of the cable, through the circuit generated by the short circuit between the faulted conductor and the metal armature, which is usually found at ground potential. At the same time, there is situations where the defect is difficult to identify precisely because of the continuity of the reinforcement or screen and their connection to ground potential. This paper describes the stages of fault identification in a low-voltage power cable and presents a case study that highlights the importance of the metal reinforcement in the case of the high-voltage impulse method. Ways to detect defects using the arc reflected method (ARM) using the shock wave generator as well as the inductive method are also briefly presented.
Xilinx control circuit made to highlight injected fuel flow
Authors: Baciu I , Cunţan C D , Popa G N , Iagar A 
Published: July 2023

Abstract
The paper presents a control circuit made in Xilinx and which allows the adjustment of the frequency and the duty cycle of the control signal of an injector. The control circuit contains an oscillator and a selection circuit that provide specific commands to a counter. The oscillator that provides the clock frequency of a counting circuit uses the Nexis 4 DDR module’s own frequency. This is to be divided to the desired value by means of a divider implemented soft which makes changing the frequency easy. The signal obtained at its output commands a counter at which the maximum value of numbers is changed by a circuit selection. Thus, the variable duty cycle of the output signal of the development board is obtained, which is amplified both in voltage and in current, for compatibility with the injector parameters. The paper presents waveform obtained when resistive load operation as well as quantities of fuel injected in a given time interval.
Stereo vision based robot welding
Authors: Erceg D , Knezevic B Z , Grahovac Z 
Published: July 2023

Abstract
The most important advantages of robotic welding are precision and productivity. Introducing visual systems in welding allows one to easily position the elements that are welded. The robot will then perform welding without error after recording the welding points. The application of visual systems in robotics is very important because it enables the autonomous work of the robot. Stereo vision is used for three-dimensional reconstruction of the robot’s environment based on images captured by cameras. The stereo system consists of two cameras and a computer that processes the recorded images using appropriate programs and algorithms. The accuracy of estimating coordinates in space using a visual system is very important, it is necessary to estimate the parameters of the cameras and define their dependence. The relationship between the two cameras, as well as their basic parameters, are assessed by camera calibration. After calibrating the camera for each 2D coordinate, obtained from the camera sensor, it is possible to determine which set of points it belongs to in the 3D coordinate system. One of the most important and most difficult problems in the reconstruction of a 3D object is finding points on the planes of images that were created from the same physical point. The problem of correspondent points is also considered in this paper. To present the efficiency and reliability of the proposed solution for obtaining 3D coordinates of points in space, the proposed solution was tested in the laboratory and satisfactory results are obtained.
Digital tools for production planning as part of decision-making processes in the manufacturing systems
Authors: Matusova M , Ruzarovsky R , Delgado Sobrino D R , Hruskova E 
Published: July 2023

Abstract
The concept of digitalisation is making inroads into all areas of production systems as part of Industry 4.0. In our case, we are dealing specifically with the digital planning of production resources and production processes. Digitized solutions are included in this paper as case studies. Our goal was to develop digital models of manufacturing systems and simulation models for manufacturing processes in the Witness Horizon digital simulation environment. Simulation can be considered as one of the technologies used in the digital factory concept. It is a powerful tool that is often used for the design and analysis of complex systems. Decisions about a system are made through the construction of its computer models and experimentation on the models.
Measurement of strain and determination of stress state using a multi-chamber vertical cylindrical tank model
Authors: Islamović F , Bajramović E , Bajramović E , Bajramović E 
Published: July 2023

Abstract
Designing a new construction of large-volume multi-chamber tanks or converting existing single-chamber tanks into multi-chamber for storage of various types of petroleum products is a very demanding and responsible job, from the aspect of strain-stress analysis and the need to ensure structural integrity. From a wide range of conducted theoretical and experimental-numerical research, this paper singles out the applied method of similarity mechanics. The research was performed on a model of a four-chamber tank with dimensions reduced by 20 times (1:20) in relation to the real tank, made of steel sheets of quality S.0361. During the cold-water pressure test on the tank model (hydro test), the change of strain and stress state was monitored in the zones that were defined as critical by the preliminary numerical analysis by the finite element method (FEM). The results of these measurements, along with other reliable methods, can be very useful in the design of multi-chamber tanks with 5.000 m3 volume.
Dynamic study through numerical simulations of MacPherson suspension and static analysis of shock absorber components
Authors: Preda C , Bleotu R M , Pinca-Bretotean C 
Published: July 2023

Abstract
A suspension or shock absorber system is a mechanical device that is designed to attenuate or reduce the shock impulse and kinetic energy due to level differences or obstacles encountered by the car. In a vehicle structure, the shock absorber reduces the effect of driving on rough terrain, which automatically leads to improved driving quality and also increases passenger comfort.
The purpose of this dynamic study by numerical simulations of the MacPherson strut suspension is to highlight the dynamic differences between the stock and heavy MacPherson suspension duty for the Volkswagen Jetta, because it is the most common type of suspension on vehicles, and it is not complex in terms of operation.
The study was carried out only at the simulation stage in the MSC ADAMS program, for the dynamic analysis of the component parts, later the second phase of the research will propose the study on a real system.
One of the specific objectives of the paper is to compare the two types of springs, the stock with which the car is equipped at the factory and the modified one, the heavy duty variant (package heavy roads).
The second specific objective is to compare the two types of springs in relation to the two heights of the speed limiter and the two types of tires.
The third objective of this paper is to perform a comparative analysis of the main components of a shock absorber assembly, statically through tests in the ABAQUS simulation program.
Later, the results obtained after the analyzes indicated that the heavy duty type suspension has a higher degree of force attenuation. The end of the study was focused on the finite element analysis of the main components of a shock absorber in a suspension, analyzed from a static point of view.
Influence of thermal stresses on the phenomenon of thermal fatigue of rolling cylinders
Authors: Pinca-Bretotean C , Josan A , Sharma Arun Kumar 
Published: July 2023

Abstract
Hot rolling cylinders are the most important machine parts in plastic deformation equipment. They are taken out of operation due to breakage caused by the predominant action of thermal stresses which cause accidental breakdowns of rolling mills. In view of these aspects, the question arose is to knowing the nature of these stresses, as well as their evaluation. This paper will experimentally determine the mechanical and thermal stresses that arise in the process of plastic deformation of hot rolling cylinders. The purpose of this paper is to evaluate the thermal stresses and compare them with the mechanical ones, as well as to highlight their influence on the thermal fatigue phenomenon. The study shows that the stresses in rolling cylinders are cyclical and occur at each rotation of the cylinders. The thermal stresses are mainly the result of the action of symmetric and asymmetric temperature fields. The overall action of thermal stresses presents an aspect of destruction of the surface layer that characterizes the effect of thermal fatigue phenomenon. The separation of the temperature fields that produce thermal stresses in symmetric and asymmetric and their experimental confirmation represents the originality of the research presented in this paper.
Development of the structure and methodological support of the system for analysis of the details shaping using the technological inheritability of their quality parameters
Authors: Kusyi Ya M , Onysko O R , Kuk A M , Kostiuk O S , Solohub B V 
Published: July 2023

Abstract
Theoretical approaches, computer modell methods and experimental studies analyse the state and behaviour of machine parts to determine the changes in their properties and parameters from a single synergetic position. Development and implementation of integrated information systems for control of technological processes of manufacturing parts and machines assembly is an essential mover of the economic growth of industrialized countries. Complicating the operational conditions for the products increases the requirements for the parameters of their accuracy, surface layer quality, performance characteristics and reliability indicators. A mechanical engineering product is a technical system consisting of many subsystems and using the functionally-oriented design of technological processes planning for parts manufacturing. The structure and methodological providing of the PSPAS-system (Product Shaping / Processing Analysis System) investigates. PSPAS system includes the investigations of the technological inheritability of mechanical engineering product quality parameters combined with the analysis of traditional subsystems (cutting, surface plastic deformation, surface layer modification, assembly). Rheological simulation modelling, holding of experimental studies, the combination of mathematical modelling, theoretical and practical studies of technological processes ensure the implementation of the CAF system using the principle of functionally-oriented design during parts manufacturing and machines assembly.
Harmfulness during technical inspection of road vehicles
Authors: Todić M , Petković S , Vranješ B 
Published: July 2023

Abstract
The drive of road vehicles, with internal combustion units, whose work is based on the use of fuels such as gasoline and autogas is currently the most represented in practice. The trend is in the development of electric vehicles. A complete replacement of the powertrain (SUS engine) is likely to take a long time. Legal obligation to regularly perform technical inspections on vehicles with these powertrains at inspection stations where technical inspection procedures are prescribed. It is known that the exhaust emissions of SUS engines contain dangerous and harmful substances that endanger operators during technical inspection and affect the environment. Therefore, the necessary equipment prescribed by each technical inspection station is prescribed in order to reduce the impact of harmfulness during the inspection of vehicles, which affects the safety and health of the operator. Their level can also cause dangers for the operators at the station, and depending on the time of testing, by not adhering to the procedure of applying the prescribed equipment to reduce the risk of their harmful impact. The hazards that occur are of physical and chemical origin.
Study and analysis of sandwich panels for use in the construction of cabin roofs used on construction equipment
Authors: Bleotu R M , Preda C 
Published: July 2023

Abstract
Sandwich panels have been of great interest in recent years due to the tendency of the engineers to replace heavy and rigid structures with light structures that allow good energy absorption and good deformation values. One of the areas that needs these panels is the cabin design used on construction equipment. These cabins are used in environments where there is a danger that various objects may hit the structure of their roof, thus endangering the health or life of operators. The aim of this study is to replace the classic cabin roofs with lighter roofs and better material properties. A first objective of this work is to adapt different types of cells and analyse them in terms of energy absorption while a compressive force is applied. The best result in terms of values obtained have been further used in the construction of the sandwich plates core. The second objective is the static analysis of sandwich plates that contain cells and walls of different thicknesses. Simulations of hitting the sandwich plate with a moving object, by creating a simulation with a finite element method, were performed. The results are compared, and the most favourable one was implemented in the construction of the construction machine. As a final objective of this paper, the dynamic analysis with the help of the finite element analysis used to validate the purpose is presented.
Influence of end cutting edge angle of a multi-point lathe cutter on the thread profile accuracy. Theoretical investigation
Authors: Onysko O , Kopei V , Barz C , Erdei Z , Rodic V 
Published: July 2023

Abstract
Modern manufacturers of tools for turning threads make them with a non-zero value of the side rake angle of the cutting edge, which significantly increases their efficiency. The value of this angle is approximately equal to the thread lead angle. However, today there is a lack of theoretical research that would provide an algorithm for calculating the effect of the side rake angle of the cutting edge on one of the indicators of the thread accuracy - the accuracy of the pitch diameter. Its effect is particularly noticeable for thread with a large pitch and relatively small diameter - such as drill string tool-joint thread. Theoretical studies show the possibility of ensuring the required accuracy without changing the profile of the cutting edge of the lathe tool.