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Thematische Bibliographien / Calculation of the shapes of the cams / Zeitschriftenartikel

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Zeitschriftenartikel zum Thema „Calculation of the shapes of the cams“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 10. Februar 2022

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1

Tang, Xue Mei, und Xin Xing Tang. „Parameterized Modeling and Dynamic Modal Analysis of Conjugate Cam Beating-up Mechanism“. Applied Mechanics and Materials 251 (Dezember 2012): 271–74. http://dx.doi.org/10.4028/www.scientific.net/amm.251.271.

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Taking the conjugate cams beating-up mechanism as an example to carry out three-dimensional parameterized design with Pro/Engineer secondary development accords to the equations of conjugate cams curves derived by the analytical method. Using the finite element software ANSYS the dynamic characteristic of beating rocker has been analyzed. And through the calculation the modal distribution and modal shapes of beating rocker are provided. It could provide references for design of future high-performance beating-up mechanism.

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Makushev, Yu P., T. A. Polyakova, L. Yu Volkova und V. V. Ryndin. „Kinematic calculation and plotting of lifting height and speed of the tangential cam pusher using MATHCAD program“. Omsk Scientific Bulletin, Nr. 178 (2021): 5–12. http://dx.doi.org/10.25206/1813-8225-2021-178-5-12.

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The article shows the design features of tangential cams with a rounded top, provides a method for determining the lifting height and speed of the pusher when the roller is rolling in a straight line and in contact with the actual profile of the cam. The formulas for the kinematic calculation of the tangential cam are refined taking into account the radius of the initial circumference of the shaft, the radius of the rounding of the cam tip and the value of the radius of the pusher roller. Calculations are given to determine the stroke and speed of the pusher when the roller is rolling on the sections of the straight and arc-shaped surface of tangential cams with a radius of rounding of 6 and 10 mm. Formulas are proposed for determining the lift of the pusher in the rolling section of the roller along the radius of the cam tip at a constant coefficient λ = 1 and λ = 1,5. Using the Mathcad program calculations are performed and combined graphs of the pusher lift and the change in its speed are constructed for two types of tangential cams

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3

Volkova, S. N., A. V. Shleenko, V. V. Morozova und E. E. Sivak. „Analysis of Linear Surfaces of Building Structures“. Proceedings of the Southwest State University 24, Nr. 3 (06.12.2020): 111–20. http://dx.doi.org/10.21869/2223-1560-2020-24-3-111-120.

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Purpose of reseach is to analyze the practice in the application of surfaces formed by the movement of a straight line. It is known that among the second-order surfaces cones, cylinders, hyperboloids of one sheet and hyperbolic paraboloids, as well as lines represented in the polar coordinate system in the form of intricate shapes that can be represented in space by the above-mentioned surfaces, adding a third dimension, have rectilinear generators. The strength resulting from covering each point of the listed surfaces with straight lines from different families does not make the structure heavier but strengthens it and makes it light compared to monoliths without reinforcements made of other materials, in which stability is not based on Shukhov calculation formulas. Methods Finding families of rectilinear generators for second-order surfaces calculation of which is based on the separation of equations that represent a second-order surface as a difference of squares in one part of the equation and as a product with an arbitrary parameter in the other part. Results. Analyzing second-order surfaces, we came to the conclusion that cones, cylinders are prone to this method of Shukhov calculations; equation of the form F (x,y)=0 in space defines a cylindrical surface whose generators are parallel to axis oz. Similarly, F (x, z)=0 defines a cylindrical surface with generators parallel to axis oy and F (y;z)=0 is a cylindrical surface with generators parallel to axis ox. A hyperboloid of one sheet, hyperbolic paraboloid, i.e. 10 surfaces out of 14, make up more than 70%. Conclusion. As a result of applying these formulas for calculating reinforced building structures, city buildings will acquire a new appearance, which will create a comfortable environment for residents, as well as lead to saving construction material resources.

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Dostrašil, Pavel, und Petr Jirásko. „Tools for Automated Design of Intermittent Mechanisms with Radial Parallel Cams“. Applied Mechanics and Materials 325-326 (Juni 2013): 299–304. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.299.

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The paper deals with the kinematics and automated calculation of intermittent mechanisms with radial cams. Currently, electronic cams are increasingly applied in the drives of working link mechanisms. Despite a huge advantage of electronic cams in their re-programmability or instantaneous change of displacement diagrams, conventional cam mechanisms have an irreplaceable role in production and handling machines. With high frequency of working cycle periods, the dynamic load of the proper servomotor rotor increases and efficiency of electronic cams strongly decreases. Though conventional intermittent mechanisms with radial cams are representatives of fixed automation, they have distinct advantages in their high speed (high dynamics), positional accuracy and relatively easy manufacture. We try to remove the disadvantage of firm displacement diagram by reducing costs for simple design and automated calculation that leads reliably to high-quality and inexpensive manufacture.

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Sukach, M. K. „The Staple-Shape Plate Springs Engineering Calculation Method“. Science & Technique 20, Nr. 3 (03.06.2021): 268–74. http://dx.doi.org/10.21122/2227-1031-2021-20-3-268-274.

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The new types of elastic devices – staple-shape plate spring and leaf spring - have been developed at the Kyiv National University of Construction and Architecture. The staple-shape plate spring is an elastic plate where the ends are deflected from its middle part in the same direction and are made in the form of consoles equipped with hinge attachments. The middle part of the plate as a parallel to the line of the load action is designed with variable length section. In each section, the axis, relative to which the moment of the section inertia is a maximum, is perpendicular to the spring bending plane, designed as the equal resistance beam. This article substantiates the feasibility of using a staple-shape plate spring to improve the elastic suspension of truck cabs. The recommendations for choosing the most promising mass production directions, as well as the engineering calculation methods of such springs, have been developed. Objects of the study are devices intended for machines and their components dynamic loads shock absorption, differing in having a bracket shape and being a subject to bending in the plane of the highest rigidity of their cross sections, as well as shock absorbers using these springs, in particular KamAZ cabs suspension. This research implementation allows significantly reducing the metal consumption and elastic devices manufacture complexity, as well as can be useful in the design and operation of elastic car suspensions.Keywords: elastic device, staple-shaped plate spring, leaf spring, elastic suspension

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6

Smith, Richard S. „Using combinations of spatial gradients to improve the detectability of buried conductors below or within conductive material“. GEOPHYSICS 78, Nr. 1 (01.01.2013): E19—E31. http://dx.doi.org/10.1190/geo2012-0210.1.

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The detection of conductive bodies is an important capability when exploring for massive sulfide deposits or looking for unexploded ordnance. When these bodies are buried below conductive overburden or embedded in conductive material, the use of an electromagnetic system to identify the bodies becomes problematic because the response of the overlying conductive material can be much greater that the response of the buried conductor. I calculated the response of five models representing different conductivity distributions (a buried conductor, a uniform overburden with changes in the system altitude, a paleochannel, a thicker overburden, and a thinner overburden). The subtle response of the buried conductor was difficult to identify because it looked very similar to the responses of other structures that are not necessarily of interest. The spatial gradients for the same five models showed that the greatest improvement in the relative size of the anomalous gradient response compared with the background gradient came for the cases in which the material closest to the surface changes, in particular the paleochannel and thickening overburden models. However, identification of the deeper buried conductor was still problematic because of the large background gradients. In theory, the cylindrical symmetry of a dipole transmitter over a layered earth ensured that there were exact relations between the spatial derivatives. Hence it was possible to define two specific combinations that should be zero over a layered earth. Calculating these combinations for the five models showed that the anomalous zones stood out with significantly greater anomaly-to-background ratios. The measurement of the gradients and the calculation of these combinations therefore provided a means of identifying anomalous zones in and below a conductive earth. Different relative sizes and shapes of the two combinations for different models provided a way of discriminating between the vertical conductor model and the four other models.

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Buj-Corral, Irene, Enrique Zayas-Figueras und Àngels Montaña-Faiget. „Comparative Study of Flank Cams Manufactured by WEDM and Milling Processes“. Metals 10, Nr. 9 (27.08.2020): 1159. http://dx.doi.org/10.3390/met10091159.

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Cam-follower mechanisms are usually employed in different machines, like combustion engines, sewing machines, machine tools, etc. In the present paper, the option to manufacture cams utilizing wire electrical discharge machining (WEDM) has been considered. For this, surface roughness and shape error of cam profiles manufactured by the processes of milling and wire electrical discharge machining (WEDM) are presented. The methodology used covers different stages: design, prototyping, manufacturing, and measurement of the cams. As a reference, a cam-follower mechanism from a motorcycle internal combustion engine has been used. A reverse engineering process has been performed to determine the geometrical parameters of the mechanism, which are used for the synthesis of the profile of the cam and its subsequent design. The manufacturing process of the cams has been assisted by CAD-CAM (Computer Assisted Drawing-Computer Assisted Manufacturing) software. Using fused filament fabrication (FFF), a physical prototype of the cam has been manufactured, in order to validate the goodness of the design. Finally, the roughness and shape parameters have been measured on the contour surface of the cams. The arithmetical mean roughness Ra value of the milled cam was 0.269 μm, below the requirement of 0.4 μm, and shape error was 18 μm, below 50 μm. Shape error of the WEDM cam of 48 μm meets the requirements for cams. However, the Ra value of 1.212 μm, exceeded the limit. For this reason, a finish operation is recommended in this case. Some advantages of WEDM cams over milled cams are that different conductive materials can be employed, more complex shapes can be obtained, and that, in rough operations, the amount of material to be removed in subsequent operations is considerably reduced.

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Mougeot, X., M. M. Bé und C. Bisch. „Calculation of beta spectral shapes“. Radioprotection 49, Nr. 4 (26.09.2014): 269–73. http://dx.doi.org/10.1051/radiopro/2014017.

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9

Burdzik, R., Ł. Konieczny, Z. Stanik, P. Folęga, A. Smalcerz und A. Lisiecki. „Analysis of Impact of Chosen Parameters on the Wear of Camshft“. Archives of Metallurgy and Materials 59, Nr. 3 (28.10.2014): 957–63. http://dx.doi.org/10.2478/amm-2014-0161.

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Abstract The paper provides an analysis of the reasons for excessive wear of the camshafts system components based on models developed to describe the impact of selected material, technological and operational factors. The subject of the research was wear of camshaft cams studied in accordance with results of operation tests. Based on the said tests, the dependence of wear intensity of cams from their angular position was established. The respective calculation results enabled the function of cam fallibility to be determined.

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Березін, Л. М. „ДО РОЗРАХУНКУ ГЕОМЕТРИЧНИХ ПАРАМЕТРІВ ПОДАТЛИВИХ ГРАНЕЙ КЛИНІВ“. Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 138, Nr. 5 (03.02.2020): 9–16. http://dx.doi.org/10.30857/1813-6796.2019.5.1.

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Development of recommendations for calculating the geometry of cams with flexibility facet, which have console beams with variable moment of section resistance along their length for provide strength conditions and specified deflections. Method of search, description, analogous and information analysis is used to audit the many possible decisions regarding the subject of research, the experience in the field of knitting machines of automatic half-hose machine and methods of cross and longitudinal sections from the classical position of resistance of materials. Mathematical support for the complex approach of working out of cams of various designs with flexibility working facets according to the criteria of strength, flexibility and minimization of geometric dimensions using the beam shape coefficient of deflections is presented. The advantages of beams with equal resistance along its length in comparison with homogeneous beams having constant section sizes are shown. The dependences are given, which advisable to determine the dimensions of the root and final sections of a trapezoidal beam with a free end load of concentrated force, and also formulas for calculating the shape coefficient by deflection with sufficient accuracy and convenience in engineering calculations. Further development of the theory and methodology of designing elements of knitting systems of automatic half-hose machine based on load modes, dimensions restrictions and technological process requirements. Questions are presented that contribute to a comprehensive approach to the improvement of cams designs with flexibility facet based on calculated recommendations, taking into account their specificity. The information helps to improve the quality and efficiency of cam design solutions to meet the requirements for strength and flexibility using the economic index of section.

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Liu, Hu Ran. „ГУЧТЬЯР Method to Determine the Base Circle Radius of Cams“. Applied Mechanics and Materials 55-57 (Mai 2011): 2218–23. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.2218.

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This paper presents a new way to determine the base circle of a cam by using the displacement and velocity graphs. This is a simple method to guarantee the obtained pressure angle aless than the allowed pressure angle [a], while the work of calculation is reduced dramatically.

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12

Tang, Xuemei. „Calculation Algorithm for Kinematics Accuracy Reliability of Conjugate Cams Beating-up Mechanism“. Journal of Information and Computational Science 11, Nr. 18 (10.12.2014): 6787–93. http://dx.doi.org/10.12733/jics20105298.

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13

Shi, Xiang Dong, Shao Hua Shen und Cheng Wen Chai. „Application of Conjugate Cam Design Software Platform in Die Cutting Platen Press Mechanism“. Applied Mechanics and Materials 127 (Oktober 2011): 207–13. http://dx.doi.org/10.4028/www.scientific.net/amm.127.207.

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The design of the conjugate cams was analyzed in this paper, and the calculation process of conjugate cams profile data to meet the pressure angle and the curvature radius was introduced in detail. With VB as the software platform, the curves data of the conjugate cams were designed and calculated, the curves were also displayed on the platform. Base on the designing platform, the motion parameter of the followers, such as displacement, velocity and acceleration, could be achieved and saved in the certain format. The parameterization design and motion analysis were also could be performed to help the designer to find the mistakes, such as the rotation difficulty caused by excessive pressure angle, the motion distortion and overcut during machining caused by small radius of curvature. So the mistakes could be corrected and the product developing cycle could be shortened. The system could accomplish the information transmission and information sharing among the subsystems and enhanced the integration and automation of the conjugate cam design and manufacture. It also could be taken as platform for designing, manufacturing and performance researching of the conjugate cams. Finally, the example of the moving platform die-cutting mechanism in an automatic die-cutting machine verified the usability and effectiveness of the software platform.

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Gao, Wei Qiang, Qiu Sheng Yan, J. Liang und Z. Y. Liu. „Studies on NC Machining for Cylindrical Cams“. Key Engineering Materials 291-292 (August 2005): 489–94. http://dx.doi.org/10.4028/www.scientific.net/kem.291-292.489.

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Cylindrical cam mechanisms have many merits, such as compact configuration, low cost, high reliability, better performance of kinematics and dynamics, and they have been widely used in fields of automatization and mechanization. Cylindrical cam mechanisms are the spatial mechanisms. Traditional methods of design and machining for cylindrical cam were complex, and it was difficult to ensure the precision of machining cylindrical cams, so it is impossible to meet the requirement of the development of high-speed automatic equipments. The better method of machining for cylindrical cams is to use the NC milling machine with 3 moving coordinates and 1 revolving coordinate. The key to realize the machining method is to resolve the problem of calculating tool’s paths for NC machining from the motion rule of followers of cam mechanisms. In this paper, the programming principle and technology of NC machining for cylindrical cams were analyzed, the compensation of cutting-tool radius for NC machining was discussed, the method of calculation for motion rule of cam followers and method of programming of NC machining with 4-coordinates were proposed, through which perfect effect have been gained in practice.

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Qin, Wenjie, und Lunjing Duan. „Wear predictions for cams in line contacts based on multidisciplinary simulation“. Industrial Lubrication and Tribology 67, Nr. 2 (09.03.2015): 159–65. http://dx.doi.org/10.1108/ilt-04-2014-0034.

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Purpose – This paper aims to present the model and method involving multi-body system dynamic analysis, finite element quasi-statics contact analysis and numerical calculation of elastohydrodynamic lubrication (EHL), according to the cam wear prediction using Archard’s model. Cam–follower kinematic pairs always work under wear because of concentrated contacts. Given that a cam and follower contact often operates in the mixed or boundary lubrication regime, simulation of cam wear is a multidisciplinary problem including kinematic considerations, dynamic load and stress calculations and elastohydrodynamic film thickness evaluations. Design/methodology/approach – Multi-body system dynamic analysis, finite element quasi-statics contact analysis and numerical calculation of EHL are applied to obtain the dynamic loads, the time histories of contact pressure and the oil film thicknesses in cam–follower conjunctions to predict cam wear quantitatively. Findings – The wear depth of the cam in the valve train of a heavy-load diesel engine is calculated, which is in good agreement with the measured value in the practical test. The results show that the cam–tappet pair operates under a mixed lubrication or boundary lubrication, and the wear depths on both sides of the cam nose are extremely great. The wear of these points can be decreased significantly by modifying the local cam profile to enlarge the radii of curvature. Originality/value – The main value of this work lies in the model and method involving multi-body system dynamic analysis, finite element quasi-statics contact analysis and numerical calculation of EHL, which can give good prediction for the wear of cam.

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Klement’ev, Alexandr N., Michael Y. Churin und Evgeny V. Zubkova. „PUSHING VESSELS DYNAMIC SQUAT AND PECULIARITES OF ITS CALCULATION“. Russian Journal of Water Transport, Nr. 62 (10.03.2020): 145–54. http://dx.doi.org/10.37890/jwt.vi62.45.

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In the article the question concerning the dynamic squat manifestation on pushing vessel in the shallow water condition is examined. In the article existing methods of dynamic squat calculating for pushing compound analysis is carried out, for instance: V.Pavlenko’s method, A.Polunin’s method , P. Shanchurov ‘s method , G. Suhomel’s method , doctor C. Barross’s method, Volga State University of Water Transport method.. Basing on the existing methods analysis we came to the conclusion of using Volga State Unveersity of Water Transport method.The method helps to calculate the pushing vessels dynamic squat, it also considers the pushing vessels hull’s shape .In the article the pusing vessles dynamic squat calculation formula considering the pushing vessels formation peculiarities is presented.

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Jonsson, Jan Åke, und Per Lövkvist. „Calculation of adsorption isotherms from chromatographic peak shapes“. Chemometrics and Intelligent Laboratory Systems 5, Nr. 4 (April 1989): 303–10. http://dx.doi.org/10.1016/0169-7439(89)80029-2.

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Dokshitzer, Yu L., und B. R. Webber. „Calculation of power corrections to hadronic event shapes“. Physics Letters B 352, Nr. 3-4 (Juni 1995): 451–55. http://dx.doi.org/10.1016/0370-2693(95)00548-y.

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19

Koplik, J., und T. J. Lasseter. „Two-Phase Flow in Random Network Models of Porous Media“. Society of Petroleum Engineers Journal 25, Nr. 01 (01.02.1985): 89–100. http://dx.doi.org/10.2118/11014-pa.

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Abstract To explore how the microscopic geometry of a pore space affects the macroscopic characteristics of fluid flow in porous media, we have used approximate solutions of the porous media, we have used approximate solutions of the Navier-Stokes equations to calculate the flow of two fluids in random networks. The model pore space consists of an array of pores of variable radius connected to a random number of nearest neighbors by throats of variable length and radius. The various size and connectedness distributions may be arbitrarily assigned, as are the wetting characteristics of the two fluids in the pore space. The fluids are assumed to be incompressible, immiscible. Newtonian, and of equal viscosity. In the calculation, we use Stokes flow results for the motion of the individual fluids and incorporate microscopic capillary force by using the Washburn approximation. At any time, the problem is mathematically identical to a random electrical network of resistors, batteries, and diodes. From the numerical solution of the latter, we compute the fluid velocities and saturation rates of change and use a discrete timestepping procedure to follow the subsequent motion. The scale of the computation has restricted us so far to networks of hundreds of pores in two dimensions (2D). Within these limitations, we discuss the dependence of residual oil saturations and interface shapes on network geometry and flow conditions. Introduction A significant limitation to our understanding of the dynamics of multiphase fluids in porous media is the inability to connect the physics at the microscopic scale to the macroscopic phenomena observed in the laboratory and in the field. Within individual pores, the motion of fluids and menisci can be discussed, at least approximately, in terms of the microgeometry and the physical characteristics of the liquids. gases, and solids present. On the macroscopic scale, the multiphase Darcy equations involving several empirical parameters-relative permeabilities and average capillary pressures permeabilities and average capillary pressures conventionally are used. The connection between these two levels of description, if there is one, has never been elucidated despite years of effort (as reviewed by Scheidegger ). In consequence, it is difficult to predict the behavior of oil reservoirs in advance, and considerable waste of money, effort, and resources can ensue. Economic issues aside, this situation provides another example of a pervasive problem in physics: macroscopic averaging of a random problem in physics: macroscopic averaging of a random microscopically disordered medium to predict large-scale behavior from a knowledge of small-scale dynamics. In optimal circumstances, existing methods in the physics literature (i.e., Ziman ) can be used to carry out physics literature (i.e., Ziman ) can be used to carry out the averaging. For fluid problems, for example, percolation theory has been applied to the spatial distribution of percolation theory has been applied to the spatial distribution of fluids in a pore space, both in static situations and in quasistatic displacement. Another set of ideas, effective medium theories, has been applied to electrical conductivity and its fluid analog, absolute permeability. The general fluid displacement problem, when both permeability. The general fluid displacement problem, when both capillary and viscous forces are present, is related to a class of physics problems that are as yet unresolved, such as crystal growth, surface evolution, and dynamic percolation. In this situation, we are forced to resort to percolation. In this situation, we are forced to resort to brute-force numerical modeling, both as a means of obtaining statistical information and as a guide to approximations that may permit future analytical work. In this paper, we describe our initial efforts to calculate the motion of two fluids in porous media from the microscopic scale up, starting from the Stokes equations and boundary conditions in this pore space. As usual, we model the porous medium as a network of similarly shaped, but randomly sized, elements. The key to the calculation is the mathematical analogy between the fluid problem and an appropriate electrical network of random problem and an appropriate electrical network of random resistors, batteries, and diodes. The calculation is a very difficult one, numerically speaking, and to date we have been restricted to fairly small 2D networks of hundreds of pores. We expect, however, that with more sophisticated programming methods our approach can be applied to three-dimensional (3D) networks of thousands of pores. pores. After this work was in progress, we came across a paper of Singhal and Somerton where a similar calculational framework was used but with a different emphasis. Those authors considered a single realization of a small network of triangular channels of random sizes with flow regimes randomly assigned in each channel and compute the relative permeabilities and capillary pressure curves of the network. Our emphasis in this paper is on time-dependent phenomena and statistical averaging of flow quantities. We also note the somewhat related work by Payatakes et al., who considered a square lattice of Payatakes et al., who considered a square lattice of converging/diverging tubes meeting at point nodes and simulate the dislodgement of blobs of trapped oil. Subsequently, Dias and Payatakes used the same geometry and calculational rules similar to those employed here to study fluid displacement. SPEJ P. 89

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LACROIX, C., und F. CASTAIGNE. „FREEZING TIME CALCULATION FOR PRODUCTS WITH SIMPLE GEOMETRICAL SHAPES“. Journal of Food Process Engineering 10, Nr. 2 (April 1988): 81–104. http://dx.doi.org/10.1111/j.1745-4530.1988.tb00006.x.

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Zimmer, Maximilian, Michael Otto und Karsten Stahl. „Calculation of arbitrary tooth shapes to support gear design“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, Nr. 11 (16.09.2015): 2075–79. http://dx.doi.org/10.1177/0954406215606929.

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This article provides a mathematical framework based on the basic law of gear kinematics for calculating the tooth geometry of arbitrary gear types. The described algorithms are illustrated by means of practical applications, especially nonstandard gearings. The computed geometry is exported as a point cloud with integrated STEP-modeling. Thus, further analysis of the generated gear types are possible, e.g. by computer-aided design or finite-element software tools as well as manufacturing on 5-axis-CNC or forging machines.

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Khasenevich, L. S. „CALCULATION OF FOUNDATIONS WITH CIRCULAR (CLOSED) IN-PLANE SHAPES“. Science & Technique 16, Nr. 2 (01.01.2017): 153–59. http://dx.doi.org/10.21122/2227-1031-2017-16-2-153-159.

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Kramer, G., und S. G. Salesch. „Calculation of jet shapes in γp collisions at HERA“. Physics Letters B 317, Nr. 1-2 (November 1993): 218–22. http://dx.doi.org/10.1016/0370-2693(93)91596-f.

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Watanabe, Takehiro, und Yoshitaro Yoshida. „Numerical calculation of shapes machined with pulsed YAG laser“. Journal of Mechanical Working Technology 17 (August 1988): 297–306. http://dx.doi.org/10.1016/0378-3804(88)90031-9.

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Blinov, D. S., und I. S. Chunosov. „FEATURES OF MANUFACTURING TECHNOLOGY FOR THIN-WALLED PARTS“. Spravochnik. Inzhenernyi zhurnal, Nr. 283 (Oktober 2020): 15–26. http://dx.doi.org/10.14489/hb.2020.10.pp.015-026.

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In Russia, there is a tendency to revive the machine tool industry. From here, research in the field of mechanical engineering technology becomes relevant. The most popular research in the field of mechanical engineering technology is research on improving the manufacturing technology of thin-walled parts based on more reliable calculations. Axisymmetric thin-walled parts are very widely used in mechanical engineering, and they can be divided into rings and shells depending on the ratio of length to diameter. The objects of research in the article, which is staged in the cycle of works, are rings. The review and analysis of devices for installing thin-walled parts and methods for calculating errors from the action of fixing forces and cutting forces showed that standard cartridges are most often used for installing rings, and in the calculations of fixing forces are assumed to be concentrated (applied at a point). The work offers special devices–mandrels with wide cams, which are advisable to use when installing rings in mass production. The rings have a tolerance for the diameter of the base hole, which is intended to be used in the study. The purpose of the study is to develop an engineering method for calculating the shape error in the cross section of a thin-walled ring fixed by three wide mandrel сams, taking into account the width of the contact area and the initial radial gap between the diameter of the workpiece hole and the diameter of the working cylindrical surface of the cam. The tasks that will allow you to achieve the goal, the initial data, and a number of assumptions to simplify the study are identified.

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Blinov, D. S., und I. S. Chunosov. „FEATURES OF MANUFACTURING TECHNOLOGY FOR THIN-WALLED PARTS“. Spravochnik. Inzhenernyi zhurnal, Nr. 283 (Oktober 2020): 15–26. http://dx.doi.org/10.14489/hb.2020.10.pp.015-026.

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In Russia, there is a tendency to revive the machine tool industry. From here, research in the field of mechanical engineering technology becomes relevant. The most popular research in the field of mechanical engineering technology is research on improving the manufacturing technology of thin-walled parts based on more reliable calculations. Axisymmetric thin-walled parts are very widely used in mechanical engineering, and they can be divided into rings and shells depending on the ratio of length to diameter. The objects of research in the article, which is staged in the cycle of works, are rings. The review and analysis of devices for installing thin-walled parts and methods for calculating errors from the action of fixing forces and cutting forces showed that standard cartridges are most often used for installing rings, and in the calculations of fixing forces are assumed to be concentrated (applied at a point). The work offers special devices–mandrels with wide cams, which are advisable to use when installing rings in mass production. The rings have a tolerance for the diameter of the base hole, which is intended to be used in the study. The purpose of the study is to develop an engineering method for calculating the shape error in the cross section of a thin-walled ring fixed by three wide mandrel сams, taking into account the width of the contact area and the initial radial gap between the diameter of the workpiece hole and the diameter of the working cylindrical surface of the cam. The tasks that will allow you to achieve the goal, the initial data, and a number of assumptions to simplify the study are identified.

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Scheucher, R., und W. Hellinger. „Using Bézier splines for design optimization of cams regarding valve train dynamics“. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 221, Nr. 3 (01.09.2007): 429–39. http://dx.doi.org/10.1243/14644193jmbd57.

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The aim of this work is to present an optimization problem to design cams for automotive valve trains. The constrained optimization problem uses the control points of the cam profile as design variables. The cam profile is represented by harmonic splines. In addition to the optimization problem the advantages of the calculation of sensitivity information using the direct are determined. The valve train model is defined by a multi-body system containing discontinuities because of the loss of contact between two consecutive components of the valve train. The objective is to maximize the area below the valve lift, which has a great influence on the gas flow. Constraints for dynamic force, the valve opening and closing phase and the valve lift based on the engine's thermodynamics considerations are taken into account. Furthermore, some constraints for the geometric coordinates of the control points of the cam profile must be imposed.

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Li, Xiaomei, Pinhua Xie, Ang Li, Jin Xu, Zhaokun Hu, Hongmei Ren, Hongyan Zhong et al. „Variation Characteristics and Transportation of Aerosol, NO2, SO2, and HCHO in Coastal Cities of Eastern China: Dalian, Qingdao, and Shanghai“. Remote Sensing 13, Nr. 5 (27.02.2021): 892. http://dx.doi.org/10.3390/rs13050892.

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This paper studied the method for converting the aerosol extinction to the mass concentration of particulate matter (PM) and obtained the spatio-temporal distribution and transportation of aerosol, nitrogen dioxide (NO2), sulfur dioxide (SO2), and formaldehyde (HCHO) based on multi-axis differential optical absorption spectroscopy (MAX-DOAS) observations in Dalian (38.85°N, 121.36°E), Qingdao (36.35°N, 120.69°E), and Shanghai (31.60°N, 121.80°E) from 2019 to 2020. The PM2.5 measured by the in situ instrument and the PM2.5 simulated by the conversion formula showed a good correlation. The correlation coefficients R were 0.93 (Dalian), 0.90 (Qingdao), and 0.88 (Shanghai). A regular seasonality of the three trace gases is found, but not for aerosols. Considerable amplitudes in the weekly cycles were determined for NO2 and aerosols, but not for SO2 and HCHO. The aerosol profiles were nearly Gaussian, and the shapes of the trace gas profiles were nearly exponential, except for SO2 in Shanghai and HCHO in Qingdao. PM2.5 presented the largest transport flux, followed by NO2 and SO2. The main transport flux was the output flux from inland to sea in spring and winter. The MAX-DOAS and the Copernicus Atmosphere Monitoring Service (CAMS) models’ results were compared. The overestimation of NO2 and SO2 by CAMS is due to its overestimation of near-surface gas volume mixing ratios.

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29

Radu, Carmen Elisabeta, Edward Rășchitor und Iosif Tempea. „Calculation of the Collapsing Critical Load of a Translating Cam Mechanism and Roller Translating Follower Actuating an Elevator“. Advanced Engineering Forum 42 (07.09.2021): 99–106. http://dx.doi.org/10.4028/www.scientific.net/aef.42.99.

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The above-ground parking lot above Dâmbovița river has stemmed from the need to cover the lack of parking lots in Bucharest. The parking lot may be serviced, in case of emergency, by auxiliary elevators that are operated by mechanisms provided with translating cams and roller translating followers. In this paper, a calculation of the collapsing critical load shall be performed. One shall also analyze here the rod model and the model with several rods of the mechanism provided with a translating cam and roller translating follower. In order for the rods to resist collapsing, one must be found in the elastic field, thus verifying Euler’s formula.

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Ge, Rong Yu, Xian Ying Feng und Pei Quan Guo. „Nonequivalent Milling of Roller Gear Cams Based on Approximation Method of Offset Surface“. Advanced Materials Research 97-101 (März 2010): 1998–2001. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1998.

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The roller gear cam surface is manufactured with nonequivalent milling method in many cases, by which the machining error is unavoidable. In order to simplify the tool position, we can transform one problem approximating the designed surface with the tool envelope surface to another problem approaching the theoretical tool axis trajectory surface with the actual one. Furthermore, the theoretical tool axis trajectory surface, which is an offset surface of the designed cam surface, is reconstructed by the NURBS ruled surface. In order to find the best tool axis vector to minimize the machining error, a simple least square approximation method is established to figure out all the control points of the NURBS tool axis trajectory surface. A numerical calculation and simulation example is described to verify the effectiveness of the tool position method proposed in the paper.

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Gao, Bing Tian. „Research and Application on a Multi Head Conjugate Disc Indexing Cam Mechanism“. Applied Mechanics and Materials 184-185 (Juni 2012): 384–88. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.384.

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In order to realize the technical performance of high speed, high precision, high stability and high reliability for conjugated indexing mechanism with periodic intermittent rotary motion, a two cams structure has been designed, and its geometry size and profile curve was carefully determined. Also the calculation formula of the contour curve for CAM was deduced. Research achievement has been applied to new equipment of enterprise development, the working performance is stable and reliable, the production efficiency raised by 30% compared to the domestic industry. The mechanism has characteristics of simplified structure, improved transmission performance and low cost.

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Xu, Xin, und Yi Wang Chen. „RCS Calculation of Tank Turrets and their Improved Stealth Shapes“. Applied Mechanics and Materials 477-478 (Dezember 2013): 379–83. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.379.

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By considering the effects of shadowing on RCS, calculation on panel and edge diffrection was performed. Taking the model of sphere and flat structure as numerical example, results show that the method is effective. The RCS of M1A2SEP tanks turrets and type 99 tanks turrets were calculated at different angle by combining the physical optics and equivalent currents. The shape of the turrets were improved to make the stealth effect better.

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Schlecht, M., und K. Schulte. „Advanced Calculation of the Room-Temperature Shapes of Unsymmetric Laminates“. Journal of Composite Materials 33, Nr. 16 (August 1999): 1472–90. http://dx.doi.org/10.1177/002199839903301601.

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34

Lu, Peng‐Xian, Man‐Man Lu, Chun Kong, Meng Zhang und Zhi‐Wei Zhao. „Thermoelectric transport calculation of Si nanoclusters with different geometric shapes“. Micro & Nano Letters 13, Nr. 1 (Januar 2018): 87–92. http://dx.doi.org/10.1049/mnl.2017.0446.

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35

Mukamel, Shaul, und James Sue. „Eigenstate‐free calculation of Raman line shapes in anharmonic molecules“. Journal of Chemical Physics 82, Nr. 11 (Juni 1985): 5291–92. http://dx.doi.org/10.1063/1.448607.

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36

Joosten, K., und G. Nienhuis. „Analytical calculation of the excess noise for different aperture shapes“. Europhysics Letters (EPL) 48, Nr. 5 (01.12.1999): 526–32. http://dx.doi.org/10.1209/epl/i1999-00516-1.

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37

Shyy, Wei, und Madhukar M. Rao. „Calculation of meniscus shapes and transport processes in float zone“. International Journal of Heat and Mass Transfer 38, Nr. 12 (August 1995): 2281–95. http://dx.doi.org/10.1016/0017-9310(94)00336-t.

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38

Wentker, Marc, Matthew Greenwood und Jens Leker. „A Bottom-Up Approach to Lithium-Ion Battery Cost Modeling with a Focus on Cathode Active Materials“. Energies 12, Nr. 3 (05.02.2019): 504. http://dx.doi.org/10.3390/en12030504.

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In this study, we develop a method for calculating electric vehicle lithium-ion battery pack performance and cost. To begin, we construct a model allowing for calculation of cell performance and material cost using a bottom-up approach starting with real-world material costs. It thus provides a supplement to existing models, which often begin with fixed cathode active material (CAM) prices that do not reflect raw metal price fluctuations. We collect and display data from the London Metal Exchange to show that such metal prices, in this case specifically cobalt and nickel, do indeed fluctuate and cannot be assumed to remain static or decrease consistently. We input this data into our model, which allows for a visualization of the effects of these metal price fluctuations on the prices of the CAMs. CAMs analyzed include various lithium transition metal oxide-type layered oxide (NMC and NCA) technologies, as well as cubic spinel oxide (LMO), high voltage spinel oxide (LNMO), and lithium metal phosphate (LFP). The calculated CAM costs are combined with additional cell component costs in order to calculate full cell costs, which are in turn scaled up to full battery pack costs. Economies of scale are accounted for separately for each cost fraction.

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Furudate, Michiko, Satoshi Nonaka und Keisuke Sawada. „Calculation of Shock Shapes over Sharp Cone in Intermediate Hypersonic Airflow“. Journal of Thermophysics and Heat Transfer 17, Nr. 2 (April 2003): 250–58. http://dx.doi.org/10.2514/2.6758.

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40

Loring, Roger F. „Statistical mechanical calculation of inhomogeneously broadened absorption line shapes in solution“. Journal of Physical Chemistry 94, Nr. 2 (Januar 1990): 513–15. http://dx.doi.org/10.1021/j100365a006.

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41

Wang, Zhaohong, Tiantong Tang, Shi Chen und Bing Chen. „Field analysis and calculation of interdigital transducers with arbitrary finger shapes“. Journal of Physics D: Applied Physics 39, Nr. 22 (03.11.2006): 4902–8. http://dx.doi.org/10.1088/0022-3727/39/22/024.

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42

Paterson, J. H., S. J. Cooke und A. D. R. Phelps. „Finite-difference calculation of demagnetizing factors for shapes with cylindrical symmetry“. Journal of Magnetism and Magnetic Materials 177-181 (Januar 1998): 1472–73. http://dx.doi.org/10.1016/s0304-8853(97)00788-9.

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43

Roosen, Andrew R., Ryan P. McCormack und W. Craig Carter. „Wulffman: A tool for the calculation and display of crystal shapes“. Computational Materials Science 11, Nr. 1 (März 1998): 16–26. http://dx.doi.org/10.1016/s0927-0256(97)00167-5.

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44

Reichardt, Thomas A., und Robert P. Lucht. „Theoretical calculation of line shapes and saturation effects in polarization spectroscopy“. Journal of Chemical Physics 109, Nr. 14 (08.10.1998): 5830–43. http://dx.doi.org/10.1063/1.477205.

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45

WATANABE, Takehiro, Yoshitaro YOSHIDA und Chikara SHIMO. „Numerical Calculation of Shapes Machined with Pulsed YAG Laser (1st Report)“. Review of Laser Engineering 14, Nr. 11 (1986): 965–74. http://dx.doi.org/10.2184/lsj.14.965.

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46

Agakhanov, E. K., G. M. Kravchenko, A. S. Osadchiy und E. V. Trufanova. „CALCULATION OF BUILDINGS WITH COMPLEX GEOMETRIC SHAPES FOR WITHSTANDING WIND IMPACT“. Herald of Dagestan State Technical University. Technical Sciences 44, Nr. 2 (01.01.2017): 8–17. http://dx.doi.org/10.21822/2073-6185-2017-44-2-8-17.

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47

Laksar, Jan. „Improved calculation of the slot leakage inductance of different slot shapes“. Electrical Engineering 102, Nr. 3 (12.02.2020): 1129–39. http://dx.doi.org/10.1007/s00202-019-00910-w.

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48

Williams, C. D. H., D. Evans und J. S. Thorp. „Numerical calculation of magnetometric demagnetisation factors for octahedra and other shapes“. Journal of Magnetism and Magnetic Materials 79, Nr. 2 (Juni 1989): 183–88. http://dx.doi.org/10.1016/0304-8853(89)90096-6.

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49

Tang, Yan Jun, Bao Dong Shao, He Ming Cheng und Ying He. „The Numerical Analysis of Ultimate Efficiency for Vertically Loaded Anchors“. Applied Mechanics and Materials 444-445 (Oktober 2013): 1077–81. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.1077.

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The purpose of this article is to deepen the understanding and knowing for the limited efficiency of bearing of plate anchors by means of the calculation of the ultimate holding capacity (UPC) of plate anchors with different shapes. In the process of calculation of UPC, the commercial software MARC is employed. The soil is assumed to be elastic-perfect plastic with yield determined by the VON MISES condition. And displacement constraints are imposed and the corresponding ultimate anti-force can be determined. Then the ultimate bearing efficiency of anchor plates with different shapes can be obtained.

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Shen, Xiao Bin, Zuo Dong Mu, Gui Ping Lin und Yue Zhou. „Prediction of Ice Shape for Three-Dimensional Engine Inlet Based on the Proper Orthogonal Decomposition Method“. Advanced Materials Research 1008-1009 (August 2014): 1011–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.1011.

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To increase the prediction speed of ice accretion on the 3D engine inlet, the Proper Orthogonal Decomposition (POD) method was introduced. Taking the ice shapes from CFD numerical calculation results as samples, in view of the change of icing temperature, the procedures of predicting the ice shapes by POD method were introduced, which used ice shapes’ coordinates and ice accretion height as compute parameters, respectively. The POD and CFD ice shapes were found coincident, which indicates that the POD method can fast and accurately calculate the 3D engine inlet ice shapes. The results from the two different POD parameters were shown and compared, and the ice shapes were nearly the same, which means they have the same effect. However, the POD method based on ice accretion height is simpler and more appropriate

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