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Process performance and form accuracy of edges on inclined surfaces of parts when processing with radial polymer abrasive brushes

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International Journal of Abrasive Technology 2022年第2期11卷 136-152页

作者： Podashev, Dmitry Department of Design and Standardization in Mechanical Engineering School of Aircraft Construction Mechanical Engineering and Transport Irkutsk National Research Technical University Lermontov St. 83 Irkutsk664074 Russia

This article is devoted to the technology of processing edges on inclined surfaces of long parts with 3M elastic polymer-abrasive brushes. The regularities of the influence of the inclination angle to the processed edge on its size and shape accuracy are established. It was proved that when changing the angle of inclination of the surface, it was necessary to change the angle of the brush relative to the processed edge. Equations were also obtained making it possible to determine the values of the average edge size depending on the brush deformation ΔY, speed V, feed S, and the angle of inclination of the machined surface β. Based on the totality of the studies carried out, technology was proposed making it possible to assign processing modes in which it is possible to obtain edges that meet all the design and technological requirements of the aviation industry in terms of size and shape accuracy both on horizontal sections of parts and on inclined sections with an angle β. Copyright © 2022 Inderscience Enterprises Ltd.

关键词： edge rounding angled surface polymer abrasive brush process performance form accuracy

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In-Plane Thermal Conductivity Measurement of Microscale Polymer Films Using a Reusable Micro-Thermocouple

SSRN

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SSRN 2024年

作者： Zhang, Yanhui Yang, Jie Jiang, Qinmeng Liu, Yi Zhou, Yi Lv, Maochao Wang, Jianli Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Department of Mechanical Engineering Southeast University Nanjing210096 China Changzhou Institute of Inspection Testing Standardization and Certification Changzhou213164 China School of Information and Control Engineering China University of Mining and Technology Xuzhou221008 China

Polymers serve as encapsulating materials for electronic devices, making it crucial to study their thermophysical properties. In this work, a novel 2ω method for assessing the in-plane thermal conductivity of polymer films is proposed. A reusable micro-thermocouple serves as both a heating wire and a sensor, using silver paste as the interstitial material in contact with the test film. By means of comparing the 2ω voltages in both contact and non-contact conditions, the thermal impedance is determined. By calculating the slope of the thermal impedance real part against the frequency logarithm, one can directly determine the thermal conductivity. Theoretical analysis indicates that the influences from contact thermal resistance and radiation heat loss are negligible. To validate the method accuracy, we repeated the measurements on polyimide and polyester films under varied contact conditions. The results obtained from these films demonstrate consistency and align with the outcomes of the laser spot periodic heating technique. © 2024, The Authors. All rights reserved.

关键词： Polymer films

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Development and research of motion control algorithms of elastic electromechanical systems taking into account the damping properties of the electric drive

Development and research of motion control algorithms of ela...

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2021 International Conference on Automatics and Energy, ICAE 2021

作者： Iov, I.A. Kuznetsov, N.K. Dolgih, E.S. «SLC-JH» Ltd. Mira St. 101 bld Moscow129085 Russia Department of Design and Standardization in Mechanical Engineering Irkutsk National Research Technical University 83 Lermontov St. Irkutsk664074 Russia

The paper presents the results of studies of the effect of the counter-electromotive force (CEMF) of the dc machine on the parameters of the elastic oscillation control system of a two-mass electromechanical system, synthesized based on of solving the inverse problems of dynamic in accord with prescribed nature of controlled motion. It is shown by the method of numerical simulation that taking into account the CEMF leads to an increase of the damping properties of the electromechanical system and an increase of the gains of the feedbacks on the force in the cable. A method for the selection of these gains is proposed, based on their comparison with the gains obtained in an electromechanical system without taking into account the CEMF and an approximate assessment of its effect on the nature of the transient processes. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Inverse problems

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A simple and high -performance immobilization technique of membrane protein from crude cell lysate sample for a membrane-based immunoassay application

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Journal of Immunoassay and Immunochemistry 2023年第1期44卷 76-89页

作者： Khemthongcharoen, Numfon Uawithya, Panapat Yookong, Nutthapon Chanasakulniyom, Mayuree Jeamsaksiri, Wutthinan Sripumkhai, Witsaroot Pattamang, Pattaraluck Juntasaro, Ekachai Kamnerdsook, Ampol Houngkamhang, Nongluck Promptmas, Chamras Department of Biomedical Engineering Faculty of Engineering Mahidol University Nakhon Pathom Thailand NECTEC National Science and Technology Development Agency (NSTDA) Pathumthani Thailand Department of Physiology Faculty of Medicine Siriraj Hospital Mahidol University Bangkok Thailand Department of Clinical Chemistry Faculty of Medical Technology Mahidol University Bangkok Thailand Center for Standardization and Product Validation Faculty of Medical Technology Mahidol University Bangkok Thailand Thai Microelectronics Center (TMEC) NECTEC National Science and Technology Development Agency (NSTDA) Chachoengsao Thailand Mechanical Engineering Simulation and Design Group The Sirindhorn International Thai-German Graduate School of Engineering (TGGS) King Mongkut’s University of Technology North Bangkok (KMUTNB) Bangkok Thailand College of Materials Innovation and Technology King Mongkut’s Institute of Technology Ladkrabang (KMITL) Bangkok Thailand

Membrane proteins are difficult to be extracted and to be coated on the substrate of the immunoassay reaction chamber because of their hydrophobicity. Traditional method to prepare membrane protein sample requires many steps of protein extraction and purification that may lead to protein structure deformation and protein dysfunction. This work proposes a simple technique to prepare and immobilize the membrane protein suspended in an unprocessed crude cell lysate sample. Membrane fractions in crude cell lysate were incorporated with the large unilamellar vesicle (LUV) that was mainly composed of POPC (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine) before coating in the polystyrene plate by passive adsorption technique. Immunofluorescence staining and the Enzyme-Linked Immunosorbent Assay (ELISA) examination of a strictly conformation-dependent integral membrane protein, Myelin Oligodendrocyte Glycoprotein (MOG), demonstrate that LUV incorporated cell lysate sample obviously promotes MOG protein immobilization in the microplate well. With LUV incorporation, the dose–response curve of the MOG transfected cell lysate coating plate can be 2–9 times differentiated from that of the untransfected cell lysate coating plate. The LUV incorporated MOG transfected cell lysate can be efficiently coated in the microplate without carbonate/bicarbonate coating buffer assistance. © 2022 Taylor & Francis.

关键词： conformation-dependent immunoassay crude cell lysate coating enzyme-linked immunosorbent assay Membrane protein immobilization unilamellar vesicle preparation

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Synthesis of Optimal Structures of the Motion Controller of Elastic Mechatronic Systems

Synthesis of Optimal Structures of the Motion Controller of ...

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2019 International Multi-Conference on Industrial engineering and Modern Technologies, FarEastCon 2019

作者： Kuznetsov, N.K. Dolgih, E.S. Iov, I.A. Irkutsk National Research Technical University Head of the Department of Design and Standardization in Mechanical Engineering Irkutsk Russia Engineer SLC-JH Ltd Irkutsk Russia

ISBN: (纸本)9781728100616

Using the example of a two-mass calculation scheme with the help of which the dynamic properties of many mechatronic systems with elastic links can be described, the results of studies the synthesis of optimal controller structures for the implementation of a given motion based on the solution of the inverse dynamic problems are presented. It is shown that the found control actions in the form of time dependencies can be expressed through the generalized coordinates of the system and their derivatives and implemented using various structures of motion controllers on the basis of feedback. Possible ways of technical implementation of the proposed structures of controllers are discussed and the results of a numerical study of their effectiveness for limiting elastic oscillations in a two-mass mechatronic system are given. © 2019 IEEE.

关键词： Controllers

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Influence of the value of the tension force of the belt transmission with a V-belt on the value of the transmitted mechanical power

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AIP Conference Proceedings 2023年第1期2976卷

作者： Piotr Krawiec Łukasz Warguła Piotr Kaczmarzyk Olga Zharkevich Poznan University of Technology Faculty of Mechanical Engineering Institute of Machine Design Piotrowo 3 street 61-138 Poznan Poland Scientific and Research Centre for Fire Protection – National Research Institute 05-420 Józefów Poland Poznan University of Technology Faculty of Mechanical Engineering Institute of Machine Design Piotrowo 3 street 61-138 Poznan Poland Department of Technological Equipment Mechanical Engineering and Standardization Karaganda State Technical University 100027 Karaganda Kazakhstan

Laboratory stands for measuring the values of power, torque and rotational speed, working mechanisms of machines, are often connected with belt transmissions. Transmissions with a V-belt are additionally characterized by the possibility of working as an overload clutch. However, if the belt is not tensioned properly, the measurement may not be performed correctly. The aim of the article is to show the range of belt tension force values that enable proper measurement of the driving power of the positive pressure fan. Additionally, the analysis covered the influence of using one or two V-belts. The tested positive pressure fan worked at a maximum of about 4.15 ± 0.2 kW, the belt tension from 230 ± 2 N to 650 ± 2 N ensured operation with these parameters. Increasing the number of belts from one to two did not increase the fan operation range with greater power. The tests confirmed that the change of the belt tension force from the operating point of the belt not causing the belt slippage does not significantly affect the value of the driving power transmitted, if the system is not overloaded.

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The inverse task solution for the calculation of sweeps of sheet parts by integral geometry

Research Square

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Research Square 2021年

作者： Mironenko, Vladimir Elovenko, Denis Graf, Alexander Kräusel, Verena Ledovskikh, Catherine Department of Aircraft Building and Aircraft Maintenance Irkutsk National Research Technical University 83 Lermontov street Irkutsk664074 Russia Department of Design and Standardization in Mechanical Engineering Irkutsk National Research Technical University 83 Lermontov street Irkutsk664074 Russia Professorship Forming and Joining Technische Universität Chemnitz Reichenhainer Str. 70 Chemnitz09107 Germany Institute of Aviation Engineering and Transport Irkutsk National Research Technical University 83 Lermontov street Irkutsk664074 Russia

This article deals with the search for a rational semi-finished product for parts of the integral form. Here a variant of the solution of the given problem is described based on the inverse solution of the mathematical problem. The reasons and the nature of the problem occurring in standard approaches to the calculation of the semi-finished product are shown using the example of two parts with aerodynamic curvature. The material and sheet thickness of the components are selected to suit the application. The forming process is also the same as the initial situation. The rational shape of the part can be found using the optimization solution based on the discrepancy of the contours with respect to the sweeps of the dynamic calculation and the CAD model. The new shape of the blank makes it possible to realize the forming process of the parts with minimal deviations from the contour of the 3D model. © 2021, CC BY.

关键词： Aerodynamics

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Development and Research of Motion Control Algorithms of Elastic Electromechanical Systems Taking into Account the Damping Properties of the Electric Drive

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Journal of Physics: Conference Series 2021年第1期2096卷

作者： I A Iov N K Kuznetsov E S Dolgih «SLC-JH» Ltd. Mira St. 101 bld Moscow 129085 Russian Federation Department of Design and Standardization in Mechanical Engineering Irkutsk National Research Technical University 83 Lermontov St. Irkutsk 664074 Russian Federation

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The study of thermal conductivity of asbestos cardboard and fire clay powder to assess the possibility of their application in prefabricated structures of cylindrical housings of pressure vessels

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Materials Today: Proceedings 2019年 19卷 2389-2395页

作者： Denis Elovenko Verena Kräusel Department of Design and Standardization in Mechanical Engineering Irkutsk National Research Technical University 83 Lermontov Street 664074 Irkutsk Russian Federation Professorship Forming and Joining Technische Universität Chemnitz Reichenhainer Str. 70 09107 Chemnitz Germany

The problem of protecting various elements of process equipment (pressure vessels, reactors, etc.) from critical heating has always been always relevant. The use of thermal insulation materials characterized by low thermal conductivity , high modulus of elasticity and the ability to maintain its aggregate state after a long repeated exposure to pressure and temperature is one of the main ways to address the issue. This work describes the methodology and results of the study of thermal insulation materials (fire clay powder (FCP) and asbestos) and the dependence of their thermal conductivity on the pressure applied to them. The results of the study of thermal insulation materials of different thicknesses demonstrated that a significant effect of reducing the harmful thermal effects on the main load-bearing elements of the process equipment is achieved with a sufficiently small thickness of the embedded layer of the material (up to 10 mm). Likewise, the work describes the progress and results of experimental studies of the combined cylindrical wall with built-in wall heating elements and a layer of thermal insulation material. Coefficients of thermal conductivity of thermal insulation materials (fire clay powder and asbestos) have been determined. The practical possibility of effective protection against overheating of the bearing cylindrical wall of the pressure vessel body has been proved. The use of the thermal insulation layer results in the possibility of increasing the temperature and pressure of the process space of pressure vessels and reactors without changing the size of the bearing part of the wall in comparison with existing similar structures.

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Mathematical Model of One and Two-Step Methods Calculation of Thermal Fields and Stress-Strain State of Multilayer Cylindrical Constructions

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Materials Today: Proceedings 2019年 11卷 494-503页

作者： Denis Elovenko Andreas Hirsch Verena Kräusel Department of Design and Standardization in Mechanical Engineering Irkutsk National Research Technical University 83 Lermontov street 664074 Irkutsk Russian Federation Professorship Machine Tools and Forming Technology Technische Universität Chemnitz Reichenhainer Str. 70 09107 Chemnitz Germany Professorship Forming and Joining Technische Universität Chemnitz Reichenhainer Str. 70 09107 Chemnitz Germany

Two-step and one-step methods for calculating thermal fields and stress-strain state of multilayer cylindrical constructions (parts of vessel bodies or reactors) have been developed to ensure their functioning under the conditions of high internal pressure and temperature. The efficiency of this algorithms by a simple example of the contact interaction of two cylinders of equal rigidity (α = 0,5) and thermal conductivity in two cylinders in contact heat exchange with thermal conductivity of similar value (α = 0,5) are shown. Two-step method implements the alternate solution step by step of applying kinematic and force tasks for solving the problem of static contact and the tasks of heat transfer and heat field for solving the thermal problem. One-step method realizes the solution of either the power problem on basis of the determined the error resulting from the addressing the kinematic problem, as it is determined in the previous step, or the kinematic problem on the basis of the specified error stemming from the addressing the force problem, which is also defined in the previous step for solve the static contact problem. Also, one-step method realizes the solution applied to the heat transfer problem based on the specified value of the error deriving from the initial addressing the said problem which is determined in the previous step.

关键词： stress state numeral method autoclave stress contact iteration

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