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Relevant bibliographies by topics / Changing preload

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Journal articles
Dissertations / Theses
Conference papers

Academic literature on the topic 'Changing preload'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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Journal articles on the topic "Changing preload"

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Wu, Qiong, Lei Li, and Yi-Du Zhang. "Simulations and Experiments on Vibration Control of Aerospace Thin-Walled Parts via Preload." Shock and Vibration 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/8135120.

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Thin-walled parts primarily comprise the entire piece of rough machining, and the material removal rate can surpass 95%. Numerous components with thin-walled structures are preferred in the aerospace industry for their light weight, high strength, and other advantages. In aerospace thin-walled workpiece machining processes and practical applications, they are excited by the vibration. The preload changing the modal stiffness of the part is found and this change causes continuous changes in the natural frequency. Researching on the influence of pretightening force on dynamic characteristics of

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Xia, Zhongxian, Yuhou Wu, Hua Wei, et al. "Experimental Research on the Influence of Working Conditions on Vibration and Temperature Rise of Si3N4 Full-Ceramic Bearing Motors." Shock and Vibration 2021 (November 8, 2021): 1–16. http://dx.doi.org/10.1155/2021/1176566.

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Working conditions such as lubrication, preload, and rotational speed have important influence on vibration and temperature rise of the spindle motor. In this study, controlled variable experiments are carried out on the silicon nitride (Si3N4) full-ceramic ball bearing and steel bearing of the same type, and the vibration signal characteristics and temperature rise of the spindle motor are tested and analysed, by changing the lubrication conditions, preloads, and rotational speeds of the spindle motor. Through the research, it is found that as the rotational speed increases, the vibration vel

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Li, Xiao-hu, Yan-fei Zhang, Jun Hong, Hong Zhao, and Huan-feng Li. "Experiment analysis of spindle performance with rolling bearing under non-uniform preload." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 17 (2016): 3135–46. http://dx.doi.org/10.1177/0954406215605867.

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As a result of the manufacturing errors in the main parts of spindle, and the errors in assembly process of spindle, as well as the non-uniform heat distribution during spindle operation, the non-uniformly distributed preload in rolling bearing is inevitable. The non-uniform preload has not only axial force on the rolling bearing, but also the bending moment around the rolling bearing center. The effect of preload in bearing being non-uniform on the spindle performance is still unclear. In order to analyze the spindle performance with rolling bearing under non-uniform preload, a spindle test s

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Chen, Kai, Li Zu, and Li Wang. "Prediction of preload attenuation of ball screw based on support vector machine." Advances in Mechanical Engineering 10, no. 9 (2018): 168781401879916. http://dx.doi.org/10.1177/1687814018799161.

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Ball screw is a mechanical device widely used in mechanical field. The reverse clearance of ball screw will reduce its precision. In order to eliminate the reverse clearance, it is necessary to apply preload to the ball screw. It is very difficult to measure the preload in real time, and the data are large and time-consuming. By using machine learning method to predict and supervise preload, the changing trend of working condition of ball screw can be evaluated in advance, and the working precision of screw is controlled, which has important engineering significance. In this article, the relat

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Scallan, Joshua P., John H. Wolpers, Mariappan Muthuchamy, David C. Zawieja, Anatoliy A. Gashev, and Michael J. Davis. "Independent and interactive effects of preload and afterload on the pump function of the isolated lymphangion." American Journal of Physiology-Heart and Circulatory Physiology 303, no. 7 (2012): H809—H824. http://dx.doi.org/10.1152/ajpheart.01098.2011.

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We tested the responses of single, isolated lymphangions to selective changes in preload and the effects of changing preload on the response to an imposed afterload. The methods used were similar to those described in our companion paper. Step-wise increases in input pressure (Pin; preload) over a pressure range between 0.5 and 3 cmH2O, at constant output pressure (Pout), led to increases in end-diastolic diameter, decreases in end-systolic diameter, and increases in stroke volume. From a baseline of 1 cmH2O, Pin elevation by 2–7 cmH2O consistently produced an immediate fall in stroke volume t

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ZANNOLI, ROMANO, IVAN CORAZZA, PAOLA CACCIAFESTA, and ANGELO BRANZI. "EVALUATING THE MECHANICAL BEHAVIOR OF A VENTRICULAR SIMULATOR." Journal of Mechanics in Medicine and Biology 05, no. 02 (2005): 369–73. http://dx.doi.org/10.1142/s0219519405001503.

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The mechanical performance of a ventricular simulator was characterized by recording Pressure-Volume loops for different preload and afterload conditions. The End Systolic Pressure-Volume Relationship was drawn to demonstrate a "physiological" behaviour. The external work of the artificial ventricle was calculated by the P-V loop area and the presence of the Frank–Starling mechanism was demonstrated. The P-V loop was obtained by recording the internal pressure and by integrating the flow signal recorded at the orifice of the artificial ventricular chamber. The preload was modified by increasin

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Turek, Paweł. "Optimization of the Control Algorithm for an Active Bearing Support." Applied Sciences 14, no. 2 (2024): 824. http://dx.doi.org/10.3390/app14020824.

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This article presents a spindle system with an active bearing support for which the author proposed a control system based on a PID controller. This type of solution improves the mechanical properties of this spindle by changing the stiffness, which results in a wider range of permissible rotational speeds, lower power losses and an increased resistance to vibrations of the entire system. This work describes the mechanism of changing the bearing preload. During tests on a real test stand, the correct functioning of the preload control system was checked for various dynamic conditions. In this

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Kenny, Jon-Emile S., Ross Prager, Philippe Rola, et al. "Inferior Vena Caval Measures Do Not Correlate with Carotid Artery Corrected Flow Time Change Measured Using a Wireless Doppler Patch in Healthy Volunteers." Diagnostics 13, no. 23 (2023): 3591. http://dx.doi.org/10.3390/diagnostics13233591.

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(1) Background: The inspiratory collapse of the inferior vena cava (IVC), a non-invasive surrogate for right atrial pressure, is often used to predict whether a patient will augment stroke volume (SV) in response to a preload challenge. There is a correlation between changing stroke volume (SV∆) and corrected flow time of the common carotid artery (ccFT∆). (2) Objective: We studied the relationship between IVC collapsibility and ccFT∆ in healthy volunteers during preload challenges. (3) Methods: A prospective, observational, pilot study in euvolemic, healthy volunteers with no cardiovascular h

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Zhao, Yang, Yaping Xue, and Weining Lei. "Analysis of the static characteristics of magnetic preloaded small-throat gas thrust bearing rotary table." Journal of Physics: Conference Series 3009, no. 1 (2025): 012081. https://doi.org/10.1088/1742-6596/3009/1/012081.

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Abstract To make orifice-compensated aerostatic bearings stiffer, we have added permanent magnets to the design of thrust aerostatic bearings. This study looks at a type of bearing that uses air and magnets to see how changes in magnetic force, air pressure, and hole size affect the bearing’s performance. The magnetic preload force is created when permanent magnets interact with magnetic materials, using the no-current permanent magnetic field module in COMSOL. We made a simulation model to study how far the magnetic field reached. How the magnetic forces connect and how the magnetic strength

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Alfares, Mohammed, Omar Saleem, and Majed Majeed. "Analytical study of thermal variation impact on dynamics of a spindle bearing system." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 233, no. 4 (2019): 871–98. http://dx.doi.org/10.1177/1464419319841687.

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Changes in the thermal status of machine tools spindle-bearing system can have a noticeable effect on the performance of the machine itself, and therefore studying the thermal effect on the performance ball bearing during service is important. For this purpose, a study was carried out where a simple rotating shaft system supported by two angular contact ball bearings was taken into consideration. Heat was generated due to the contact between the balls and rings of the bearing. This thermal effect on the dynamics of the system was studied using a transient thermal model. The system was divided

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Dissertations / Theses on the topic "Changing preload"

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TAMATAM, LAKSHMINARAYANA REDDY. "Effect of wear on the dynamics of structures with friction contacts." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2929758.

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Conference papers on the topic "Changing preload"

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Lu, Mingjian, Haipeng Geng, Guohui Xu, Lie Yu, and Weimin Wang. "Analytical and Experimental Study of Dynamic Characteristics of Rod Fastened Rotor-Bearing System Under Preload Saturation." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95397.

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This paper investigates the dynamic characteristics of a composite rotor fastened by rods. Contact stiffness and equivalent bending stiffness between discs with different rod preloads of the rotor are obtained respectively by using the elastic and elastic-plastic contact theory. The finite element model of rotor-bearing system is built with Timoshenko beam elements. Critical speeds are respectively calculated with and without the consideration of contact effect, including the changing bearing dynamic coefficients. A test rig of rod fastening rotor-bearing system has been constructed to verify

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Mak, Robin, Ali Amoozandeh Nobaveh, Giuseppe Radaelli, and Just L. Herder. "A Curved Compliant Differential Mechanism With Neutral Stability." In ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-89406.

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Abstract Differential mechanisms are remarkable mechanical elements that are widely utilized in various systems; nevertheless, conventional differential mechanisms are heavy and difficult to use in applications with limited design space. In this paper, a curved lightweight compliant type of differential mechanism is presented. This mechanism acquires its differential characteristic by having a high rotational stiffness when the mechanism is symmetrically actuated on two sides, while having a low rotational stiffness when actuated only on one side. The intrinsic elastic strain energy required f

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Park, Jisu, and Kyuho Sim. "A Feasibility Study of Controllable Gas Foil Bearings With Piezoelectric Materials via Rotordynamic Model Predictions." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76273.

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This study presents a new concept of gas bearings consisting of controllable gas foil bearings (C-GFBs) in which piezoelectric actuators are applied to the GFBs. The C-GFB consists of a laminated top foil, bump foil, and piezo stacks and can simply change the bearing shape or film thickness locally and globally by varying the thickness of the piezo stacks by adjusting the input voltage. The working method of C-GFBs is as follows. First, the bearing clearance is adjusted by changing the overall piezo stack thickness (clearance control). Second, the bearing preload (preload control) is modulated

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Smith, Eric, and Al Ferri. "Shock Isolation in Finite-Length Dimer Chains With Linear, Cubic and Hertzian Spring Interactions." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13229.

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A numerical investigation to mitigate the effects of shock in finite 1:1 dimer chains is performed. Dimer chains consist of alternating light and heavy masses. Changing the mass ratio has provided interesting results in previous research. In particular, in the case of Hertzian contacts with zero-preload, certain mass ratios have revealed minimal levels of transmitted force. This paper examines this phenomena from the perspective of utilizing it in practical isolation systems. The zero-preload Hertzian contact case is contrasted with chains connected by linear or cubic springs. Through numerica

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Guan, Hanqing, Tianyu Liu, Tao Zhang, Kai Feng, and Zhiyang Guo. "Vibration Control for Rotor Mounted on a Novel Active Bump Type Foil Bearing With Controllable Mechanical Preloads." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75894.

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A novel active bump type foil bearing (ABFB) is put forward aims at demonstrate the feasibility of applying active lubrication control of the aerodynamic gas bearing. The proposed active structure consists of (1) piezoelectric actuators (PZTs) amounted in the bearing housing to produce control forces, (2) flexure hinges machined in the bearing housing to produce pivot for the lever amplifier, (3) lever amplifier machined in the bearing housing to amplify the deformation of PZTs. The mechanical preloads of the ABFB can be actively adjusted by using lever amplifiers which is actuated and control

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Sato, Koji, Akira Muramatsu, Takashi Kobayashi, and Toshiyuki Sawa. "FEM Stress Analysis and Sealing Performance of Bolted Flanged Connections Using PTFE Blended Gaskets Under Internal Pressure." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45268.

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The objective of the paper is to examine mechanical characteristics of bolted flanged connection with newly developed PTFE blended gaskets under internal pressure such as the contact gasket stress distribution, the sealing performance, the load factor, reduction in axial bolt load due to creep and the flange hub stress. The relationship between the leak rate and the contact gasket stress for newly developed PTFE blended gasket were measured according to JIS B 2490 as well as the stress - displacement relationship of the gaskets. Then, the leak rate for bolted flanged connection with the PTFE b

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Hayashi, Akio, Hiroto Ishibashi, Yoshitaka Morimoto, Yoshiyuki Kaneko, and Naohiko Suzuki. "Study on Method to Avoid Chatter Vibration Based on Machine Tool Rigidity." In JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8533.

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Abstract Chatter vibration decreases machining accuracy and thus presents a problem in manufacturing. In order to eliminate chatter vibration based on the estimation of stable cutting conditions from a stability limit diagram and to determine the cutting conditions accordingly has been proposed. However, changing the cutting conditions may lead to a decrease in productivity. The stability limit is estimated from the relationship between machine rigidity and the cutting conditions. In the present study, we proposed a system to avoid chatter vibration by changing the rigidity of the machine tool

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Balabina, Tat'yana, Mariya Karelina, and Aleksey Mamaev. "THE INFLUENCE OF THE LENGTHS OF THE LINKS OF THE HINGED FOUR-LINK ON THE ANGLE OF HEIGHT, RETURN ANGLE AND RELATIVE DISPLACEMENT OF LINKS CONNECTED BY THE ELASTIC ELEMENT DURING THE OUTPUT LINK STABILITY." In PROBLEMS OF APPLIED MECHANICS. Bryansk State Technical University, 2020. http://dx.doi.org/10.30987/conferencearticle_5fd1ed03b024e0.49570399.

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Toothed-lever and cam-toothed-lever mechanisms are widely used in technological equipment of automatic and semi-automatic action to convert the one-way rotational motion of the input link into one-way rotary motion of the output link with periodic stops. To ensure periodic rotation with a precise fixed length, an elastic element with a preload of two-sided action is introduced into the mechanism, as a result of which the mechanism has a variable structure. Compared to other mechanisms of periodic rotation, in gear-link mechanisms there is a wide possibility of influencing the function of the p

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Ting, Yung, Hui-Yi Feng, Han-Chih Hsieh, et al. "Internal Model Control Using EWMA for a Wedge-Type Piezoelectric Motor." In ASME 2007 International Manufacturing Science and Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/msec2007-31050.

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Wedge-type piezoelectric motor is easily subject to disturbance such as friction, preload and temperature change, which influences the performance significantly and reduces the positioning accuracy and reliability. In this study, Exponentially Weighted Moving Average (EWMA) method is considered to use for the velocity-feedback loop, which is included in an Internal Model Control (IMC) to achieve a Run-to-Run IMC (RtR-IMC) control structure. Such control scheme is able to adapt the control command following a changing system dynamics so that it can improve the tracking accuracy and robustness.

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Housari, Basil A., and Sayed A. Nassar. "Effect of Coating and Lubrication on the Vibration-Induced Loosening of Threaded Fasteners." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16185.

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This study provides an experimental and theoretical investigation of the effect of the bearing friction coefficient and the thread friction on the self-loosening of threaded fasteners that are subjected to cyclic transverse service loads. Coating and lubrication affect the thread and the underhead friction of the fastener, which affects the loosening rate when it is subjected to transverse loads. A mathematical model was developed to evaluate the self-loosening behavior in threaded fasteners when subjected to cyclic transverse loads. An experimental procedure and test set up are designed in or

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