Robotic Systems and Applications
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Stress influence to eddy current control of cracked aeronautical material
Get PDFEddy current testing is widely used for non-destructive evaluation of conductive materials where an induced current created by a variable magnetic field propagate on the material surface and sensed by a special sensor. The main purpose of this paper is to study the influence of the stress field near the crack tip especially in the singular and elaborated zones of aeronautical material aluminium 7075-T6 to eddy current non-destructive testing enhanced with a very particular type of probe to have better stresses sensitivity. This experimental part understands impedance variations due to the stress with high measurement reliability and shows that eddy current control is very sensitive to the stress and produces significant changes in magnetic parameters that mean stress should be considered in mechanical parts inspection
Emotional intelligence developing training program’s impact on teachers’ psycho-emotional state
Get PDFTeachers’ profession is widely described as a mentally challenging one, often leading to burnout. As emotional exhaustion is higher among representatives of this occupation in comparison to other highly emotionally challenging professions, it is important to help teachers gain necessary skills and tools in order to maintain good emotional and overall wellbeing, and effectively cope with daily stressors. The aim of the study described in this paper was to assess the impact of a 5-module emotional intelligence developing training program on teachers’ psycho-emotional health. Study sample consisted of 45 teachers, who took part in the study, filling in the research questionnaires before and after the completion of the designed training program. Participants were asked to subjectively rate their level of stress and other parameters, defining their subjective wellbeing. Results of the study revealed that after completing the training program, participants indicated a statistically significantly lower level of stress (p< 0.01). Also, participants’ subjective evaluation of the quality of their social relationships and their overall wellbeing was significantly higher (p< 0.01) after the training program completion
Manufacturing of complex geometric structure metal matrix structures used for special purposes
Get PDFThree-dimensional (3D) production systems are making rapid progress and their needs are met in every field from the construction sector to the food sector. This technology is based on a hardware called the 3D printer which performs layered production. These printers are used in producing both prototypes and machine parts and mold tools. 3D prints can be produced using 3D printers with that are based on different technologies. These production systems have some disadvantages as well as the advantages they provide. Filament supported productions have a common problem if the fluid gets stuck in the flow line. In this study, screw extruder design and product development will be provided as a new generation production technology to be used in additive production as an innovative approach in additive manufacturing technology
Hydromount elastic shell dynamic stiffness calculation using finite difference method
Get PDFA preliminary approach to calculate hydromount elastic shell dynamic stiffness using finite difference method is presented in the article. This approach is necessary to calculate and assess maximum shear deformations of hydromount rubber shell needed to further determine the hydromount stiffness and damping coefficients at resonance frequencies. For this reason, finite difference method is applied when assessing maximum shear deformations of hydromount rubber shell, caused by variable loads. It was found that using reduced length and reduced arc dimensions of cut-out hydromount shell segment the equivalent stiffness can be determined. The novelty of the proposed method lies in the possibility of a quick and fairly accurate numerical calculation of the rubber shell stiffness using the values of the rubber modulus of elasticity, its permissible shear stress, and the nominal load (weight). This approach can be used to determine and optimize the geometric dimensions of the mounts shells with a given stiffness
Mathematical modeling of forced oscillations of semidefinite vibro-impact system sliding along rough horizontal surface
Get PDFThe paper considers the motion conditions of a semidefinite vibratory system placed upon a rough horizontal surface. Such systems are sometimes called unrestrained or degenerate ones, and are usually used in various vibration-driven robots and capsules. Unlike the numerous existent investigations dedicated to a similar subject, the novelty of the present paper consists in the implementation of a crank mechanism for exciting oscillations of a double-mass vibro-impact system setting into planar locomotion a robot’s movable body. A general design diagram of the improved semidefinite vibro-impact system is proposed, and the corresponding mechanical diagram is considered. The differential equations describing the system sliding (planar locomotion) along a rough horizontal surface are derived. A thorough analysis of the main inertia-stiffness, design, and excitation parameters influencing the system motion conditions is carried out. Performing the numerical modeling in MathCad software, the dynamic behavior of the robot’s movable body is studied under the specified system’s parameters and operational conditions
Analysis of the vehicle: applying finite element method of 3D data
Get PDFSystems that allow engineering studies to be done in a virtual environment with computer software, to test designs in a virtual environment and to carry out design verification studies are developing day by day. The Finite Element Method (FEM) is a method used to simulate structurally with strength visualizations, production and weight determination, proper management of materials and costs, and numerically predict how a part or assembly behaves under certain conditions with Finite Element Analysis (FEA). In this paper, control of connection elements, material and mesh (solid, surface and volume) controls and preliminary analysis processes were carried out after transferring a 3D data with defined material and connection elements to Ls-DYNA program to perform Finite Element Analysis. As a result of the preliminary analysis, the crash test of the car with the wall was carried out with the Ls-DYNA program of the model, which is suitable for Finite Element analysis. The results of the crash test were interpreted in the Ls-DYNA program. In this study, it is aimed to understand the results according to time, car displacement and speed as a result of the collusion of the car with the wall
Does Planas’ Equiplan really work in deep bite treatment?
Get PDFDeep bite malocclusion impacts function of the stomatognathic system, patients’ quality of life and self-stem by compromising oral and facial esthetics. The malocclusion can involve teeth and facial skeleton, for such is one of the most challenging malocclusion treatments. The aim of this investigation is to check the clinical belief that Planas’ Equiplan is efficient to treat deep bite malocclusion. Dental overbite was measured in 21 patients submitting to Jaw Functional Orthopedics treatment at post-graduation course. The inclusion criteria were a vertical trespass of the incisal border of the upper incisors covering the vestibular face of the lower incisors more than 3 mm, treatment cooperation and a consent form signed by the patients, or their legal tutor, allowing the use of the data obtained for research and didactic purposes. The initial measurement (T0) and 15 months treatment (T1) was collected to study overbite behavior during treatment with Planas’ Equiplan. The mean overbite of the sample at T0 was 5,02 ± 1,311 mm, at T1 the mean overbite was 2,38 ± 1,026 mm. The difference T1-T0 is –2,65 ± 1,462 mm (p< 0,01). The data presented here supports the efficacy of the use of Planas’ Equiplan in the treatment of Deep bite Malocclusion
Significance of fin tip temperature on the heat transfer rate and thermal efficiency of a convective-radiative rectangular fin with variable thermal conductivity
Get PDFIn this work, effect of fin tip temperature on the rate of heat transfer and thermal efficiency of a rectangular convective-radiative fin with temperature-dependent thermal conductivity is analyzed using differential transformation method. The results of the power series solutions are verified numerically, and very good agreements are established. Also, the symbolic solutions are used to examine the effects of the conductive-convective and nonlinear thermal conductivity parameters on the thermal performance of the passive device. It is found that when the nonlinear thermal conductivity parameter increases, the fin tip temperature increases. However, the temperature at the tip of the fin decreases as the conductive-convective parameter increases. The thermal efficiency of the fin increases as the fin tip temperature and nonlinear thermal conductivity parameters are augmented but an increase conductive-convective parameter causes the fin tip temperature and the thermal efficiency of the extended surface to reduce. An increase in the conductive-convective parameter causes decrease the temperature distribution and thermal efficiency in the passive device. However, the efficiency of the fin increases as the nonlinear thermal conductivity parameter increases. When nonlinear thermal conductivity and conductive-convective parameters increase, the rate of heat transfer at the fin base increases. The developed analytical solutions provide a good platform for the nonlinear thermal analysis of the fin and proper design of the extended surfaces in thermal systems
