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Artykuły w czasopismach na temat „Tolerances mechanism”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Caro, Ste´phane, Fouad Bennis, and Philippe Wenger. "Tolerance Synthesis of Mechanisms: A Robust Design Approach." Journal of Mechanical Design 127, no. 1 (2005): 86–94. http://dx.doi.org/10.1115/1.1825047.

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This paper provides a new robust design method to dimension a mechanism and to synthesize its dimensional tolerances. The general issue is to find a robust mechanism for a given task, and to compute its optimal dimensional tolerances. For that purpose, the developed approach follows two consecutive steps, which are independent and complementary. First, the dimensions of the mechanism are computed by means of an appropriate robustness index, which is used to minimize the sensitivity of its performances to variations. These robust dimensions are obtained independently of the amount of variations

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Li, Xin You, and Wu Yi Chen. "Accuracy Synthesis of Redundant Parallel Kinematic Mechanism with Weighted Least Square Method." Key Engineering Materials 499 (January 2012): 3–8. http://dx.doi.org/10.4028/www.scientific.net/kem.499.3.

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In order to reduce manufacturing cost, a methodology of accuracy synthesis for machine tool was recommended by combining both machining cost and Least Square method. Weighted coefficients representing the machining difficulty of manufacturing processes were introduced. 3PRS/UPS redundant parallel kinematic mechanism (3PRS/UPS PKM) was taken as an example, and its component tolerances were derived by the proposed method. Comparing with conventional method, the component tolerances were allocated reasonably. A further tolerance allocation for spherical and rotational joints was studied in detail

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3

Chen, Fu-Chen, Yih-Fong Tzeng, Meng-Hui Hsu, and Wei-Ren Chen. "COMBINING TAGUCHI METHOD, PRINCIPAL COMPONENT ANALYSIS AND FUZZY LOGIC TO THE TOLERANCE DESIGN OF A DUAL-PURPOSE SIX-BAR MECHANISM." Transactions of the Canadian Society for Mechanical Engineering 34, no. 2 (2010): 277–93. http://dx.doi.org/10.1139/tcsme-2010-0017.

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A hybrid approach of combining Taguchi method, principal component analysis and fuzzy logic for the tolerance design of a dual-purpose six-bar mechanism is proposed. The approach is to firstly use the Taguchi orthogonal array to carry out experiments for calculating the S/N ratios of the positional errors to the angular error of the dual-purpose six-bar mechanism. The principal component analysis is then applied to determine the principal components of the S/N ratios, which are transformed via fuzzy logic reasoning into a multiple performance index (MPI) for further analysis of the effect of e

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4

Zhang, Li, Hong Nie, and Xiaohui Wei. "Kinematic Accuracy Method of Mechanisms Based on Tolerance Theories." Mathematical Problems in Engineering 2020 (October 14, 2020): 1–18. http://dx.doi.org/10.1155/2020/5023092.

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Traditional tolerance analysis is mostly restricted to static analysis. However, tolerances of different components also affect the movement accuracy in a mechanism. In this paper, the idea of kinematic tolerance analysis is advanced. In the interest of achieving movement precision considering tolerance, a kinematic Jacobian model is established on the basis of a traditional dimensional chain and an original Jacobian model. The tolerances of functional element (FE) pairs are expressed as small-displacement screws. In addition, joint clearances resulting from tolerance design also influence the

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5

Cleghorn, W. L., R. G. Fenton, and Jing-fan Fu. "Optimum Tolerancing of Planar Mechanisms Based on an Error Sensitivity Analysis." Journal of Mechanical Design 115, no. 2 (1993): 306–13. http://dx.doi.org/10.1115/1.2919193.

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This paper presents an analytical procedure to determine the optimum set of tolerance bands of the dimensions of a planar mechanism. Optimum tolerance bands are those which allow the largest values of dimensional tolerances, while ensuring that the desired output motion is kept within acceptable deviations form the output that would be generated by an ideal mechanism having no errors in dimensions. The analysis technique presented permits identification of the most sensitive link dimension, the most sensitive combination of input errors, and the most sensitive period within the entire cycle, w

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6

Li, Chun Li, Jian Xin Yang, and Rui Li. "Functional Tolerance Analysis of a Complex Mechanism Based on Analysis Line Method." Applied Mechanics and Materials 373-375 (August 2013): 2078–81. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.2078.

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Tolerance analysis plays an important role at the stage of product design and has great influences on the assembly quality and manufacturing costs. For each ending point on the functional feature, the displacement transfer relationship is influenced by the clearance between the two parts and the tolerances of each part. With regard to functional tolerance accumulation for the simple assembly, the tolerance analysis of a complex mechanism with three parts is conducted based on the analysis line method. The rules for the functional tolerance analysis process will be summarized in this paper.

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7

Wu, Weidong, and S. S. Rao. "Interval Approach for the Modeling of Tolerances and Clearances in Mechanism Analysis." Journal of Mechanical Design 126, no. 4 (2004): 581–92. http://dx.doi.org/10.1115/1.1760775.

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It is important to conduct error analysis of assemblies in order to ensure that the manufactured parts satisfy the design specifications. Traditionally, mechanical tolerances and clearances are modeled as random variables and the analysis is conducted using probabilistic methods. In this work, a new approach, based on interval analysis, is presented for the modeling and analysis of tolerances and clearances. The basic procedure of interval analysis involving solution of simultaneous nonlinear equations is described. The application of the approach in the fuzzy error analysis of planar and spat

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8

Ai, Yan Ting, Jing Tian, Feng Ling Zhang, Xue Zhai, and Shu Sheng Bai. "Study on Technique of Tolerance Optimal Allocation Based on Adaptive Genetic Algorithm." Advanced Materials Research 490-495 (March 2012): 1436–40. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.1436.

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The rational allocation of tolerances is the key to reduce production costs and guarantee the performance. In this paper, in the premise of ensuring the performance, manufacturing cost minimization of assembly parts is set as objective function, and an adaptive genetic algorithm is proposed to optimize the design of tolerance allocation. The adaptive mechanism is introduced mainly for crossover operator and mutation operator to overcome the traditional adaptive genetic algorithm’s easy "premature" shortcomings according to individual fitness of population. And a penalty function is used to han

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9

Bazuev, Mikhail, Vitaly Koksharov, and Alexey Naichuk. "RESEARCH OF THE INFLUENCE OF THE DISPERSION OF THE ACTUAL LINK SIZES ON THE TRANSMISSION FUNCTION OF THE MECHANISM OF ROD SEMI-AUTOMATICS." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 64 (2021): 67–73. http://dx.doi.org/10.15593/2224-9982/2021.64.07.

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In this work, the analysis of real deviations from the nominal dimensions links, and their cumulative effect on the final movement of the chain linkage element rolling semiautomatic mechanism. The considered mechanism was converted to an equivalent one, consisting of lower translational and rotational kinematic pairs. In the course of the structural analysis, the mechanism was divided into Assur groups in order to simplify further kinematic calculations. The calculation was carried out sequentially for each of the structural groups separately. Based on this, a mathematical model of the kinemat

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10

Fu, Jing-fan, R. G. Fenton, and W. L. Cleghorn. "Synthesis of the Dimensional Tolerances of a Four-bar Mechanism." Transactions of the Canadian Society for Mechanical Engineering 12, no. 1 (1988): 9–14. http://dx.doi.org/10.1139/tcsme-1988-0002.

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This paper presents a procedure to determine allowable tolerances in the dimensions of a planar four-bar mechanism which ensure that the output motions are kept within required error bands from the untoleranced motions. Starting from a preliminary set of estimates of the errors allowed, an optimization search is employed to determine the set of link dimension tolerances required to satisfy the output motion requirements. By incorporating a set of weighting factors associated with the link dimensions, the optimization is reduced to involving one independent variable. Examples applied to functio

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11

Hussein, Hussein, Gilles Bourbon, Patrice Le Moal, Yassine Haddab, and Philippe Lutz. "Mechanical stop mechanism for overcoming MEMS fabrication tolerances." Journal of Micromechanics and Microengineering 27, no. 1 (2016): 017001. http://dx.doi.org/10.1088/0960-1317/27/1/017001.

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12

Chang, Wen-Tung, Wei-I. Lee, and Kuan-Lun Hsu. "Analysis and Experimental Verification of Mechanical Errors in Nine-Link Type Double-Toggle Mold/Die Clamping Mechanisms." Applied Sciences 11, no. 2 (2021): 832. http://dx.doi.org/10.3390/app11020832.

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Nine-link type double-toggle mold/die clamping mechanisms are widely used in modern injection molding machines and die casting machines in order to provide sufficient mold/die clamping force for counteracting the pressure occurred inside molds/dies. In this paper, the analysis and experimental evaluation of mechanical errors in nine-link type double-toggle mold/die clamping mechanisms are presented. The kinematic error equations of the output link (i.e., the moving platen) caused by dimensional errors (or tolerances) of link members are derived analytically through the concept of tolerance sen

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13

Yang, Jian Xin, Zhen Tao Liu, and Ben Zhao. "A Comparison Study of Mathematical Models for Tolerance Analysis." Advanced Materials Research 765-767 (September 2013): 759–62. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.759.

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This paper reviews two major models (Small Displacement Torsor, Deviation and Clearance Domain) for 3D functional tolerance analysis and compares them. The underlying mathematical representation of geometric tolerances can be classified as inequalities and multi-variate region. The corresponding algebraic or geometric tolerance propagation mechanism of each model is briefly introduced for worst-case and statistical tolerancing. Through a comprehensive comparison of these models, this paper gives some suggestions for choosing the appropriate method for a given tolerancing problem.

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14

Kobayashi, Yuriko, Takashi Ikka, Kazuhiko Kimura, Orito Yasuda, and Hiroyuki Koyama. "Characterisation of lanthanum toxicity for root growth of Arabidopsis thaliana from the aspect of natural genetic variation." Functional Plant Biology 34, no. 11 (2007): 984. http://dx.doi.org/10.1071/fp07133.

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The mechanism of lanthanum (La3+) toxicity on root growth of Arabidopsis was studied by physiological and genetic approaches using Landsberg erecta (Ler) × Columbia (Col) recombinant inbred lines (RILs) and other natural accessions. Quantitative trait locus (QTL) analyses revealed regulation of La3+ tolerance of the Ler × Col RILs by multiple genetic factors consisted of three significant QTLs and seven epistatic interacting loci pairs. The La content in the root tip was not correlated with La3+ tolerance in the RILs, indicating that the observed La3+ rhizotoxicity was not related to direct to

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15

Wijma, W., S. E. Boer, R. G. K. M. Aarts, D. M. Brouwer, and W. B. J. Hakvoort. "Modal Measurements and Model Corrections of A Large Stroke Compliant Mechanism." Archive of Mechanical Engineering 61, no. 2 (2014): 347–66. http://dx.doi.org/10.2478/meceng-2014-0020.

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Abstract In modelling flexure based mechanisms, generally flexures are modelled perfectly aligned and nominal values are assumed for the dimensions. To test the validity of these assumptions for a two Degrees Of Freedom (DOF) large stroke compliant mechanism, eigenfrequency and mode shape measurements are compared to results obtained with a flexible multibody model. The mechanism consists of eleven cross flexures and seven interconnecting bodies. From the measurements 30% lower eigenfrequencies are observed than those obtained with the model. With a simplified model, it is demonstrated that th

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16

KHARE, A. K. "MECHANICAL ERROR SYNTHESIS OF 4-BAR FUNCTION GENERATING MECHANISM USING INFORMATION THEORY." Transactions of the Canadian Society for Mechanical Engineering 12, no. 3 (1988): 149–52. http://dx.doi.org/10.1139/tcsme-1988-0021.

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In the present paper a method, using the concepts of information theory, is developed which enables the allocation of tolerances on link lengths of a 4-bar function generating mechanism, already synthesised for structural error, such that the effect of tolerances is least reflected in the output. Also, the total error (structural error + mechanical error) in the entire operating range of the mechanism is kept within a prescribed limit with a desired probability.

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17

Atik, Hafsa, Mouhssine Chahbouni, Driss Amagouz, and Said Boutahari. "An analysis of springback of compliant assemblies by contact modeling and welding distortion." International Journal of Engineering & Technology 7, no. 1 (2018): 85. http://dx.doi.org/10.14419/ijet.v7i1.8330.

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Due to the development of the automotive and aeronautical industries, and the impossibility of pro-typing of the flexible parts because of the large real dimension as well as the behavior of this type of parts during the assembly, the tolerance of the flexible parts become an essential step in aeronautical manufacturing. Therefore the tolerance of plates in the assembly of mechanical systems is one of the key stages in the creation of a product in the automotive and aeronautical industries. This paper deals in the first stage a presentation of the tolerance of deformable mechanisms, through th

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18

Chang, Wen-Tung, and Long-long Wu. "A COMPUTERIZED APPROACH FOR TOLERANCE ANALYSIS OF DISK CAM MECHANISMS WITH A FLAT-FACED FOLLOWER." Transactions of the Canadian Society for Mechanical Engineering 33, no. 3 (2009): 459–85. http://dx.doi.org/10.1139/tcsme-2009-0032.

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A computerized approach for analyzing the tolerances in disk cam mechanisms with a flat-faced follower is presented in this paper. Based on the simulated higher-pair contact analysis, the kinematic deviation of the follower motion caused by the tolerance amount of each design parameter can be determined numerically. The method is validated by means of analyzing the case of an eccentric circular cam mechanism; such a case has an exact solution of the follower motion error. Compared with the exact solutions, the presented computerized approach is demonstrated to be able to provide excellent accu

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19

MUSA, MAJDI H., KEVIN RUSSELL, and RAJ S. SODHI. "MULTI-PHASE MOTION GENERATION OF FIVE-BAR MECHANISMS WITH PRESCRIBED RIGID-BODY TOLERANCES." Transactions of the Canadian Society for Mechanical Engineering 30, no. 4 (2006): 459–72. http://dx.doi.org/10.1139/tcsme-2006-0029.

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This work presents a technique for synthesizing adjustable planar, five-bar motion generators to approximate prescribed rigid-body positions and satisfy rigid-body positions with prescribed tolerances. This method is an extension of the adjustable planar five-bar motion generation method introduced by the authors (1). By incorporating rigid-body point tolerances in the rigid-body displacement matrices, the calculated circle and center point curves of the five-bar mechanism become circle and/or center point regions. From these regions, fixed and moving pivots for the five-bar mechanism can be s

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20

Chen, Fu-Chen, and Hsing-Hui Huang. "THE USE OF FUZZY LOGIC IN THE TAGUCHI METHOD FOR THE DETERMINATION OF THE TOLERANCE OF A SIX-BAR HINGE MECHANISM." Transactions of the Canadian Society for Mechanical Engineering 29, no. 3 (2005): 477–89. http://dx.doi.org/10.1139/tcsme-2005-0029.

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In this paper fuzzy logic was applied to the Taguchi method to design the dimensional tolerances of a six-bar hinge mechanism with multiple performance characteristics (MPC). A fuzzy logic system was used to determine the relationship between the S/N (signal to noise) ratios of the position and the angle error for assessing the level of importance of each control factor in the hinge mechanism. The contribution of each control factor to the variations was also quantified through the response table and response diagram and the key dimensions found to significantly affect the quality of the mecha

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21

Liu, Chin-Wei, Shyong Lee, Dean Chou, Shu-Han Hsu, and Chun Lin Chu. "Dimensional accuracy in quick plastic forming of aluminum alloy using demolding mechanism." Advances in Mechanical Engineering 13, no. 6 (2021): 168781402110217. http://dx.doi.org/10.1177/16878140211021731.

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This study focuses on quick plastic forming (QPF), product dimensional tolerances, and removal methods. The traditional curled metal shell mold in QFP, has limitations such as long process time and unstable quality. Therefore, this investigation designed a demolding mechanism, in order to improve the process efficiency and dimensional accuracy of QPF, in the manufacture of metal casings. The research results show that the proposed mechanism can significantly decrease the process time, because it replaces most of the operations of specimens movement after forming completely. The shorter process

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Laouni, Djafri, and Mekki Rachida. "Monitoring and Resource Management in P2P Grid-Based Web Services." Computer Engineering and Applications Journal 1, no. 2 (2012): 71–84. http://dx.doi.org/10.18495/comengapp.v1i2.9.

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Grid computing has recently emerged as a response to the growing demand for resources (processing power, storage, etc.) exhibited by scientific applications. However, as grid sizes increase, the need for self-organization and dynamic reconfigurations is becoming more and more important. Since such properties are exhibited by P2P systems, the convergence of grid computing and P2P computing seems natural. However, using P2P systems (usually running on the Internet) on a grid infrastructure (generally available as a federation of SAN-based clusters interconnected by high-bandwidth WANs) may raise

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23

Schaechtl, Paul, Benjamin Schleich, and Sandro Wartzack. "Statistical Tolerance Analysis of 3D-Printed Non-Assembly Mechanisms in Motion Using Empirical Predictive Models." Applied Sciences 11, no. 4 (2021): 1860. http://dx.doi.org/10.3390/app11041860.

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Fused Deposition Modelling (FDM) enables the fabrication of entire non-assembly mechanisms within a single process step, making previously required assembly steps dispensable. Besides the advantages of FDM, the manufacturing of these mechanisms implies some shortcomings such as comparatively large joint clearances and geometric deviations depending on machine-specific process parameters. The current state-of-the-art concerning statistical tolerance analysis lacks in providing suitable methods for the consideration of these shortcomings, especially for 3D-printed mechanisms. Therefore, this con

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24

Tian, Wenjie, Ziqian Shen, Dongpo Lv, and Fuwen Yin. "A Systematic Approach for Accuracy Design of Lower-Mobility Parallel Mechanism." Robotica 38, no. 12 (2020): 2173–88. http://dx.doi.org/10.1017/s0263574720000028.

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SUMMARYGeometric accuracy is a critical performance factor for parallel robots, and regardless of error compensation, accuracy design or tolerance allocation is another way to ensure the pose accuracy of a robot at design stage. A general method of both geometric error modeling and accuracy design of lower-mobility parallel mechanisms is presented. First, a general approach for error modeling of lower-mobility parallel mechanism is proposed based on screw theory, and then the geometric errors affecting the compensatable and uncompensatable accuracy of the end-effector are separated using the p

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Premkumar, P., and S. N. Kramer. "Position, Velocity, and Acceleration Synthesis of the RRSS Spatial Path-Generating Mechanism Using the Selective Precision Synthesis Method." Journal of Mechanisms, Transmissions, and Automation in Design 111, no. 1 (1989): 54–58. http://dx.doi.org/10.1115/1.3258971.

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The inclusion of velocity and acceleration constraints is a crucial step in the coupling of the dynamics with the kinematics of spatial mechanisms. In this paper, an optimum synthesis technique is presented which allows an arbitrary combination of positions, velocities, and accelerations to be specified along with appropriate tolerances at one or more of the prescribed path points. The method of Selective Precision Synthesis is used to formulate nonlinear constraint equations which are then solved by the generalized reduced gradient method of optimization. This is significant since it paves th

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Sanabria, Eduardo A., Lorena B. Quiroga, and Adolfo L. Martino. "Seasonal Changes in the thermal tolerances of Odontophrynus occidentalis (Berg, 1896) (Anura: Cycloramphidae)." Belgian Journal of Zoology 143, no. 1 (2024): 23–29. http://dx.doi.org/10.26496/bjz.2013.121.

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We studied the thermal tolerances of Odontophrynus occidentalis during the dry and wet seasons of the Monte Desert in San Juan Province, Argentina. This toad had differences in CTmax between dry and wet seasons, with CTmax values being greater in the wet season (Austral summer). Operative temperature, body temperature, and environmental maximal temperature were related to CTmax suggesting seasonal acclimatization in O. occidentalis. Additionally, the CTmax recorded for O. occidentalis was 36.1ºC, and the maximum ambient temperature measured during the toads’ activity time was 37ºC. The CTmin o

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Blanche, J. G., and D. C. H. Yang. "Cycloid Drives With Machining Tolerances." Journal of Mechanisms, Transmissions, and Automation in Design 111, no. 3 (1989): 337–44. http://dx.doi.org/10.1115/1.3259004.

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The cycloidal speed reducer, or cycloid drive, is an epicyclic gear train in which the profile of the planet gear is an epitrochoid and the annular sun gear has rollers as its teeth. The cycloid drive has very high efficiency and small size, in comparison with a conventional gear mechanism, making it an attractive candidate for limited space applications. On the other hand, in this type of transmissions there exist two major drawbacks, namely, backlash and torque ripple. Backlash, the angle through which the output shaft can rotate when the input shaft is held fixed, has a degrading effect on

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Soroye, Peter, Tim Newbold, and Jeremy Kerr. "Climate change contributes to widespread declines among bumble bees across continents." Science 367, no. 6478 (2020): 685–88. http://dx.doi.org/10.1126/science.aax8591.

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Climate change could increase species’ extinction risk as temperatures and precipitation begin to exceed species’ historically observed tolerances. Using long-term data for 66 bumble bee species across North America and Europe, we tested whether this mechanism altered likelihoods of bumble bee species’ extinction or colonization. Increasing frequency of hotter temperatures predicts species’ local extinction risk, chances of colonizing a new area, and changing species richness. Effects are independent of changing land uses. The method developed in this study permits spatially explicit predictio

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Li, Chun Li, Jian Xin Yang, Jun Ying Wang, and Wen Xin Ma. "A Comparison Study of Small Displacement Torsor and Analysis Line Methods for Functional Tolerance Analysis." Advanced Materials Research 605-607 (December 2012): 358–64. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.358.

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Tolerance analysis plays an important role in the stage of product design and has great influences on the product assembly quality and manufacturing costs. Two major methods are used for three-dimensional functional tolerance analysis, which are small displacement torsor and analysis line. A positioning mechanism with two parts is presented for tolerance accumulation calculation. Through the comparison of these two methods on computation processes and results, analysis line method can establish the explicit relationship between the functional requirement and the tolerances of the influential p

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Huang, Li, Xiangjing Yin, Xiaomeng Sun, et al. "Expression of a Grape VqSTS36-Increased Resistance to Powdery Mildew and Osmotic Stress in Arabidopsis but Enhanced Susceptibility to Botrytis cinerea in Arabidopsis and Tomato." International Journal of Molecular Sciences 19, no. 10 (2018): 2985. http://dx.doi.org/10.3390/ijms19102985.

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Stilbene synthase genes make a contribution to improving the tolerances of biotic and abiotic stress in plants. However, the mechanisms mediated by these STS genes remain unclear. To provide insight into the role of STS genes defense against biotic and abiotic stress, we overexpressed VqSTS36 in Arabidopsis thaliana and tomato (Micro-Tom) via Agrobacterium-mediated transformation. VqSTS36-transformed Arabidopsis lines displayed an increased resistance to powdery mildew, but both VqSTS36-transformed Arabidopsis and tomato lines showed the increased susceptibility to Botrytis cinerea. Besides, t

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Yang, Dong Ya, and Jun Gong. "A Comprehensive Tolerancing System for 3D Mechanical Assemblies." Advanced Materials Research 139-141 (October 2010): 1289–93. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1289.

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A comprehensive tolerancing system is presented with its design principle, system architecture and key functions. The following functional modules, automatic generation of dimension chain, equivalent variational mechanism (EVM) modeling and visualized 3D tolerance analysis, are described in detail. Design intent is expressed by assembly tolerance specifications, which may be added to the model and used in computing predicted quality levels. A comprehensive method, based on equivalent replacement, has been developed for modeling variations in 3D mechanical assemblies. The models are constructed

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Csekei, M., J. Šido, R. Ružarosvský, D. Michal, and J. Milde. "Influence of Motion Mechanism Change in 3D Printers on the Quality of Printed Models." Journal of Physics: Conference Series 2714, no. 1 (2024): 012007. http://dx.doi.org/10.1088/1742-6596/2714/1/012007.

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Abstract The objective of this study is to compare the quality of 3D printed models manufactured using the Fused Filament Fabrication (FFF) method. The samples were fabricated using a robotic arm with 4 axes and conventional 3D printers. The focus of this experiment lies in assessing the influence of the devices’ structural design on the resulting quality of the 3D printed models. Additionally, the study aims to identify the strengths and limitations of each device and define their respective applicability. The 3D model designed for this investigation comprises intricate geometrical shapes spe

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Hou, Zhen Ning, Jun Wu, Qing Wang, Hong Gen Tian, Nan Chao, and Bo Zhou. "Finite Element Analysis of Load Capacity on Coupling Clamps for Pipe." Applied Mechanics and Materials 201-202 (October 2012): 741–44. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.741.

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A finite element approach based on Ansys is developed to simulate stress intensity distribution in a three dimensional model of coupling clamp joint, which includes ferrules, pipe caps and bolts. The characteristics of stress intensity distributions of coupling clamp joint under strength pressure loading have been studied by means of the non-linear finite element method. The FE model can also predict the clamp quality and tolerances to be expected under different process conditions and define the most effective process parameters to influence the tolerances. The study could give us a better un

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de Oliveira, Déborah, Raphael Lima de Paiva, Mayara Fernanda Pereira, Rosenda Valdés Arencibia, Rogerio Valentim Gelamo, and Rosemar Batista da Silva. "Dimensional and Surface Quality Evaluation of Inconel 718 Alloy After Grinding with Environmentally Friendly Cooling-Lubrication Technique and Graphene Enriched Cutting Fluid." Applied Mechanics 6, no. 3 (2025): 50. https://doi.org/10.3390/applmech6030050.

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Properly refrigerating hard-to-cut alloys during grinding is key to achieve high quality, strict tolerances, and good surface finishing. Nonetheless, literature about the influence of cooling-lubrication conditions (CLCs) on dimensional accuracy of ground components is still scarce. Thus, this work aims to evaluate surface quality, grinding power, and dimensional accuracy of Inconel 718 workpieces after grinding with silicon carbide grinding wheel at different grinding conditions. Four different CLCs were tested: flood, minimum quantity of lubrication (MQL) without graphene, and with multilaye

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C C, Handa, Bhoyar R K, Thakare S D, and Pimpalgaonkar S M. "Performance Analysis for Providing Effective Tolerance on a Link in Planer Mechanism Considering Pin-Joint Tolerances by Using Software Technology." International Journal of Mechanical Engineering 2, no. 5 (2015): 31–33. http://dx.doi.org/10.14445/23488360/ijme-v2i5p113.

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Yang, Qiang, Hongxiang Zhang, Benqi Sun, Yuan Gao, and Xin Zhao. "Reliability Optimization Design of Constrained Metamorphic Mechanism Based on the Augmented Assur Groups." Applied Sciences 14, no. 15 (2024): 6524. http://dx.doi.org/10.3390/app14156524.

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In order to obtain stable and reliable configuration transformation ability, reliability optimization design is regarded as an effective way to reduce the probability of kinematic function failure for the constrained metamorphic mechanism. Based on the structural composition principle of multi-configuration source metamorphic mechanism that can operate in an under-actuated state, the modularized calculation methods are established for the force analysis of augmented Assur groups including metamorphic kinematic joints. According to the equivalent resistance gradient model of metamorphic mechani

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Dou, Na, Li Li, Yifu Fang, Shoujin Fan, and Chunxia Wu. "Comparative Physiological and Transcriptome Analyses of Tolerant and Susceptible Cultivars Reveal the Molecular Mechanism of Cold Tolerance in Anthurium andraeanum." International Journal of Molecular Sciences 25, no. 1 (2023): 250. http://dx.doi.org/10.3390/ijms25010250.

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Anthurium andraeanum is a tropical ornamental flower. The cost of Anthurium production is higher under low temperature (non-freezing) conditions; therefore, it is important to increase its cold tolerance. However, the molecular mechanisms underlying the response of Anthurium to cold stress remain elusive. In this study, comparative physiological and transcriptome sequencing analyses of two cultivars with contrasting cold tolerances were conducted to evaluate the cold stress response at the flowering stage. The activities of superoxide dismutase and peroxidase and the contents of proline, solub

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Palma-Bautista, Candelario, Jose G. Vázquez-García, José Alfredo Domínguez-Valenzuela, Ricardo Alcántara-de la Cruz, Rafael De Prado, and João Portugal. "Filago pyramidata Tolerant to ALS-Inhibiting Herbicides: A New Invasive Weed in Olive Groves of Southern Spain." Agronomy 13, no. 5 (2023): 1273. http://dx.doi.org/10.3390/agronomy13051273.

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Weeds that usually grow in non-agricultural areas have become increasingly common invading perennial crops. Species of the genus Filago, in addition to invading Spanish olive groves, have developed certain levels of natural tolerance to the acetolactate synthase (ALS) inhibiting herbicide flazasulfuron. The objective of this study was to determine the level and the mechanism involved in the tolerance to flazasulfuron in Filago pyramidata L., which occurs in olive groves of southern Spain, as well as to identify possible cross- or multiple-tolerances by evaluating alternative herbicides for its

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Li, Jian-guang, Jian Ding, Ying-xue Yao, and Hong-gen Fang. "A new accuracy design for a 6-dof docking mechanism." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 18 (2015): 3473–83. http://dx.doi.org/10.1177/0954406215570385.

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The accuracy design is an effective approach in accuracy improvement for 6-dof docking mechanism, which involves accuracy analysis and synthesis. To improve the efficiency for accuracy analysis, the number-theoretic method (NTM)-based simulation with Sobol point set is investigated. Compared with traditional Monte Carlo (MC) simulation, Sobol set-based NTM can attain the same precision with only 1/10 sampling size of MC simulation. The accuracy synthesis process considers process ability and adopts orthogonal and uniform design of experiments with Sobol set-based NTM for simulation for efficie

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Panda, Debabrata, Jijnasa Barik, and Ramani K. Sarkar. "Recent Advances of Genetic Resources, Genes and Genetic Approaches for Flooding Tolerance in Rice." Current Genomics 22, no. 1 (2021): 41–58. http://dx.doi.org/10.2174/1389202922666210114104140.

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Flooding is one of the most hazardous natural disasters and a major stress constraint to rice production throughout the world, which results in huge economic losses. The frequency and duration of flooding is predicted to increase in near future as a result of global climate change. Breeding of flooding tolerance in rice is a challenging task because of the complexity of the component traits, screening technique, environmental factors and genetic interactions. A great progress has been made during last two decades to find out the flooding tolerance mechanism in rice. An important breakthrough i

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Zhang, Mingwu. "ADR-lrABE: New Mechanism of Direct-revocable Attribute-Based Encryption with Continual-leakage Tolerances." Fundamenta Informaticae 157, no. 1-2 (2018): 1–27. http://dx.doi.org/10.3233/fi-2018-1615.

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Rashed, E., M. Damir, and A. Elkhatib. "EFFECT OF TOLERANCES OF SMALL SIZE SLIDER-CRANK MECHANISM ON POSITION ERRORS AND UNCERTAINTY." International Conference on Applied Mechanics and Mechanical Engineering 18, no. 18 (2018): 1–13. http://dx.doi.org/10.21608/amme.2018.35003.

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Hua, Xia. "The impact of seasonality on niche breadth, distribution range and species richness: a theoretical exploration of Janzen's hypothesis." Proceedings of the Royal Society B: Biological Sciences 283, no. 1835 (2016): 20160349. http://dx.doi.org/10.1098/rspb.2016.0349.

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Being invoked as one of the candidate mechanisms for the latitudinal patterns in biodiversity, Janzen's hypothesis states that the limited seasonal temperature variation in the tropics generates greater temperature stratification across elevations, which makes tropical species adapted to narrower ranges of temperatures and have lower effective dispersal across elevations than species in temperate regions. Numerous empirical studies have documented latitudinal patterns in species elevational ranges and thermal niche breadths that are consistent with the hypothesis, but the theoretical underpinn

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Sukhija, R. P., and A. C. Rao. "Synthesis of Path-Generating Mechanisms and Tolerance Allocation Using Information Theory." Journal of Mechanisms, Transmissions, and Automation in Design 109, no. 3 (1987): 366–71. http://dx.doi.org/10.1115/1.3258804.

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The information theory based on probability concept was developed for application in communication engineering. This theory utilizes the concept of “entropy,” a measure of uncertainty. The errors existing in the output of a path-generating linkage and desired path can be taken as random variables. The entropy function is formulated in terms of design parameters. Minimization of maximum entropy leads to the synthesis of a path-generating mechanism. Optimum allocation of tolerances on link lengths is also carried out.

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Li, Shaofeng, Huijing Meng, Yanfei Yang, et al. "Overexpression of AtruLEA1 from Acer truncatum Bunge Enhanced Arabidopsis Drought and Salt Tolerance by Improving ROS-Scavenging Capability." Plants 14, no. 1 (2025): 117. https://doi.org/10.3390/plants14010117.

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Late embryonic developmental abundant (LEA) genes play a crucial role in the response to abiotic stress and are important target genes for research on plant stress tolerance mechanisms. Acer truncatum Bunge is a promising candidate tree species for investigating the tolerance mechanism of woody plants against abiotic stress. In our previous study, AtruLEA1 was identified as being associated with seed drought tolerance. In this study, LEA1 was cloned from A. truncatum Bunge and functionally characterized. AtruLEA1 encodes an LEA protein and is located in the nucleus. Phylogenetic tree analysis

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Trujillo Vilches, Francisco Javier, Sergio Martín Béjar, Carolina Bermudo Gamboa, Manuel Herrera Fernández, and Lorenzo Sevilla Hurtado. "Influence of Tool Wear on Form Deviations in Dry Machining of UNS A97075 Alloy." Metals 11, no. 6 (2021): 958. http://dx.doi.org/10.3390/met11060958.

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Geometrical tolerances play a very important role in the functionality and assembly of parts made of light alloys for aeronautical applications. These parts are frequently machined in dry conditions. Under these conditions, the tool wear becomes one of the most important variables that influence geometrical tolerances. In this work, the influence of tool wear on roundness, straightness and cylindricity of dry-turned UNS A97075 alloy has been analyzed. The tool wear and form deviations evolution as a function of the cutting parameters and the cutting time has been assessed. In addition, the pre

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STĘPIEŃ, Zbigniew. "Types of internal Diesel injector deposits and counteracting their formation." Combustion Engines 163, no. 4 (2015): 79–91. http://dx.doi.org/10.19206/ce-116859.

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The paper attempts to distinguish types of IDID (Internal Diesel Injector Deposits) with regard to the mechanism of formation, factors facilitating their formation and the method of identification. Investigations into their formation mechanism have been discussed in the paper. The results of the investigations into the chemical nature and probable source of these deposits have also been discussed. It has been pointed out that modern common rail fuel injection systems might be less tolerant to deposits due to tighter fitting tolerances, lower mass of parts and sophisticated injection strategies

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Hillman, Stanley S. "Anuran amphibians as comparative models for understanding extreme dehydration tolerance: a unique negative feedback lymphatic mechanism for blood volume regulation." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 315, no. 4 (2018): R790—R798. http://dx.doi.org/10.1152/ajpregu.00160.2018.

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Anurans are the most terrestrial order of amphibians. Couple the high driving forces for evaporative loss in terrestrial environments and their low resistance to evaporation, dehydration is an inevitable stress on their water balance. Anurans have the greatest tolerances for dehydration of any vertebrate group. Some species can tolerate evaporative losses up to 45% of their standard body mass. Anurans have remarkable capacities to regulate blood volume with hemorrhage and dehydration compared with mammals. Stabilization of blood volume is central to extending dehydration tolerance, since it av

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Blinov, D. S., D. K. Dragun, and A. S. Nosov. "PECULIARITIES OF THE DEVELOPMENT AND MANUFACTURING OF THE PROTOTYPE OF GAPLESS PLANETARY ROLLER SCREW MECHANISM." Spravochnik. Inzhenernyi zhurnal, no. 273 (December 2019): 3–12. http://dx.doi.org/10.14489/hb.2019.12.pp.003-012.

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Known designs of gapless planetary roller screw mechanisms (PRSM) are highly accurate and rigid, but have low load capacity and short life. To eliminate these shortcomings, a new design of a gapless PRSM was developed and patented using a one-piece thin-walled nut. Due to radial deformation of the nut, the gaps between the threaded parts of the mechanism are chosen. The previous works have described the design of a new gapless PRSM and theoretically proved the possibility of a significant increase in load capacity and life using this mechanism. To confirm the theoretical results and conclusion

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Muhammad, Waseem, Ali Asghar, M.Tahir, et al. "MECHANISM OF DROUGHT TOLERANCE IN PLANT AND ITS MANAGEMENT THROUGH DIFFERENT METHODS." Continental J. Agricultural Science 5, no. 1 (2011): 10–25. https://doi.org/10.5281/zenodo.839955.

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Control of drought stress in plant is not only very complex, but is also highly influenced by other environmental factors and by the developmental stage of the plant. Here we review certain physiological responses of plants to a deficit of water include leaf wilting, a reduction in leaf area, leaf abscission, and thereby reducing water loss through transpiration, and increasing the rate of photosynthesis in relation to drought. Critical global scenarios related to water availability for human consumption and crop production anticipated to arise in the near future, and intensive research is cur

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