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Journal articles on the topic 'Dynamic stiffne'

Author: Grafiati

Published: 1 April 2023

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1

Bakshi, S., A. Sarkar, and S. Chakraborty. "Dynamic Response Control of Stiffened Plate with Hole in Stiffener: A Novel Concept of Additional Open Branched Stiffeners." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (2022): 1033–39. http://dx.doi.org/10.38208/acp.v1.617.

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Modern day structures have found diverse applications of stiffened plates in civil, mechanical, aerospace, marine and offshore engineering. The stiffeners, mainly in the form of beams in these stiffened plates are often exposed to unfavourable environmental and service loads, inducing localized damage to the stiffeners. Sometimes, holes are deliberately made on the stiffeners for passing service pipes, cables etc. Both of the events cause localised loss of stiffness, finally affecting the global dynamic performances. One of the practised techniques to recover the lost stiffness and to safeguar

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2

Yin, Xuewen, Wenwei Wu, Kuikui Zhong, and Hui Li. "Dynamic stiffness formulation for the vibrations of stiffened plate structures with consideration of in-plane deformation." Journal of Vibration and Control 24, no. 20 (2017): 4825–38. http://dx.doi.org/10.1177/1077546317735969.

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A dynamic stiffness method is presented for the vibrations of plate structures that are reinforced by eccentric stiffeners. The model incorporates both out-of-plane and in-plane deformations of the plates and the stiffeners. Based on the relationship between the forces and displacements along the common edges of the plate or beam elements, the dynamic stiffness formulae for the plate and the beam elements are derived, respectively. The globally assembled dynamic stiffness matrix is then obtained using the finite element method so that the dynamics of built-up stiffened plates can be readily ad

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3

SRIVASTAVA, A. K. L., P. K. DATTA, and A. H. SHEIKH. "VIBRATION AND DYNAMIC INSTABILITY OF STIFFENED PLATES SUBJECTED TO IN-PLANE HARMONIC EDGE LOADING." International Journal of Structural Stability and Dynamics 02, no. 02 (2002): 185–206. http://dx.doi.org/10.1142/s0219455402000518.

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The vibration and dynamic instability behavior of a stiffened plate subjected to uniform in-plane edge loading is studied using finite element analysis. The method of Hill's infinite determinants is applied to analyze the dynamic instability regions. Rectangular stiffened plates possessing different boundary conditions, aspect ratios, varying mass and stiffness properties and varying number of stiffeners have been analyzed for dynamic instability. The results are obtained considering the bending displacements of the plate and the stiffener. Eccentricity of the stiffeners give rise to axial and

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4

Le, Nam Bich, Cuong Manh Nguyen, and Thinh Ich Tran. "CONTINUOUS ELEMENT FORMULATIONS FOR COMPOSITE RING-STIFFENED CYLINDRICAL SHELLS." Vietnam Journal of Science and Technology 56, no. 4 (2018): 515. http://dx.doi.org/10.15625/2525-2518/56/4/10987.

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This research studies the free vibration of composite ring-stiffened cylindrical shells by the continuous element method (CEM). The dynamic stiffness matrix (DSM) of the investigated structure has been constructed based on the analytical solutions of the governing equations of motion for composite cylindrical shells and annular plates. By applying the powerful assembly procedure of continuous elements method, natural frequencies and harmonic responses of composite ring-stiffened cylindrical shells have been obtained. In addition, the proposed model allows extracting exactly ring-stiffener vibr

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5

Gupta, Mohit, and Massimo Ruzzene. "Dynamics of Quasiperiodic Beams." Crystals 10, no. 12 (2020): 1144. http://dx.doi.org/10.3390/cryst10121144.

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Quasiperiodic metastrucures are characterized by edge localized modes of topological nature, which can be of significant technological interest. We here investigate such topological modes for stiffened and sandwich beams, which can be employed as structural members with inherent vibration localization capabilities. Quasiperiodicity is achieved by altering the geometric properties and material properties of the beams. Specifically, in the stiffened beams, the geometric location of stiffeners is modulated to quasiperiodic patterns, while, in the sandwich beams, the core’s material properties are

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6

Li, Xue-Qin, Guang-Chen Bai, Lu-Kai Song, and Wei Zhang. "Nonlinear Vibration Analysis for Stiffened Cylindrical Shells Subjected to Electromagnetic Environment." Shock and Vibration 2021 (July 19, 2021): 1–26. http://dx.doi.org/10.1155/2021/9983459.

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The nonlinear vibration behaviors of stiffened cylindrical shells under electromagnetic excitations, transverse excitations, and in-plane excitations are studied for the first time in this paper. Given the first-order shear deformation theory and Hamilton principle, the nonlinear partial differential governing equations of motion are derived with considering the von Karman geometric nonlinearity. By employing the Galerkin discretization procedure, the partial differential equations are diverted to a set of coupled nonlinear ordinary differential equations of motion. Based on the case of 1 : 2

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7

Li, Xue-Qin, Wei Zhang, Xiao-Dong Yang, and Lu-Kai Song. "A Unified Approach of Free Vibration Analysis for Stiffened Cylindrical Shell with General Boundary Conditions." Mathematical Problems in Engineering 2019 (July 10, 2019): 1–14. http://dx.doi.org/10.1155/2019/4157930.

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A unified approach of free vibration analysis for stiffened cylindrical shell with general boundary conditions is presented in this paper. The vibration of stiffened cylindrical shell is modeled mathematically involving the first-order shear deformation shell theory. The improved Fourier series is selected as the admissible displacement function while the arbitrary boundary conditions are simulated by adjusting the equivalent spring stiffness. The natural frequencies and modal shapes of the stiffened shell are obtained by solving the dynamic model with the Rayleigh-Ritz procedure. Various nume

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8

Tounsi, D., J. B. Casimir, S. Abid, I. Tawfiq, and M. Haddar. "Dynamic stiffness formulation and response analysis of stiffened shells." Computers & Structures 132 (February 2014): 75–83. http://dx.doi.org/10.1016/j.compstruc.2013.11.003.

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9

Zhang, Jing, and Xing Hua Shi. "Dynamic Response of Stiffened Plate under Underwater Contact Explosions." Advanced Materials Research 255-260 (May 2011): 1665–70. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1665.

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In order to study the dynamic responses of stiffened plate under underwater contact explosions, the FEM code LS-DYNA is used to discuss the problem, six different stiffened plates are included. The stiffened plate’s distortion, the size of crevasses in the numerical simulation are analyzed. The position where the maximum plastic strain appears, the effective stress and acceleration are also described. It is revealed that the deformation of stiffened plate is different with the position of the stiffener, but the stiffener can harmonize and reduce the deformation of plate, and the whole structur

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10

Hill, C. M., T. Kageyama, M. G. Conzemius, G. K. Smith, and F. M. Little. "Bending properties of stainless steel dynamic compression plates and limited contact dynamic compression plates." Veterinary and Comparative Orthopaedics and Traumatology 14, no. 02 (2001): 64–68. http://dx.doi.org/10.1055/s-0038-1632677.

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SummaryThe equivalent bending stiffness and bending strength of the stainless steel DCP and stainless steel LC-DCP were compared. Three plates, of each size, were tested destructively in ‘four point bending’. All of the LC-DCP were significantly less stiff and less strong than the comparable size DCP, with the exception of the 4.5 mm narrow LC-DCP which was significantly stronger and more stiff than the 4.5 mm narrow DCP (p <.01). The design advantages of the LC-DCP are ease and versatility of plate application and improved cortical blood flow which one assumes promotes fracture healing. Al

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11

Holmberg, D. L., and A. M. Fruchter. "Mechanical Analysis of the Veterinary Cuttable Plate." Veterinary and Comparative Orthopaedics and Traumatology 4, no. 04 (1991): 116–19. http://dx.doi.org/10.1055/s-0038-1633265.

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SummaryA laboratory model was chosen to compare the stiffness of various small bone plates during the application of a bending force. Forces were applied to and measured from the plate surface directly. Other compressible materials were not in contact with the supporting or measuring devices. Although we cannot recommend from this experimental model that the stiffest plate would be the best treatment option, we can conclude that: (1) the stiffness of two stacked veterinary cuttable plates was approximately equal to the sum of the stiffness for each plate, (2) screw size did not have an effect

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12

Solaroli, G., Z. Gu, A. Baz, and M. Ruzzene. "Wave Propagation in Periodic Stiffened Shells: Spectral Finite Element Modeling and Experiments." Journal of Vibration and Control 9, no. 9 (2003): 1057–81. http://dx.doi.org/10.1177/107754603030677.

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The capability of periodic structures to act as filters for propagating waves is used to control the propagation of waves in thin shells. The shells are stiffened by periodically placed rings in order to generate periodic discontinuities in the stiffness and inertial spatial distribution along the longitudinal axes of these shells. Such discontinuities result in attenuation of the wave propagation over certain frequency bands called stop bands. A distributed-parameter approach is used to derive a spectral finite element model of the periodically stiffened shell. The model accurately describes

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13

Dung, Dao Van, and Vu Hoai Nam. "An analytical approach to analyze nonlinear dynamic response of eccentrically stiffened functionally graded circular cylindrical shells subjected to time dependent axial compression and external pressure. Part 2: Numerical results and discussion." Vietnam Journal of Mechanics 36, no. 4 (2014): 255–65. http://dx.doi.org/10.15625/0866-7136/36/4/3986.

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Based on the classical thin shell theory with the geometrical nonlinearity in von Karman-Donnell sense, the smeared stiffener technique, Galerkin method and an approximate three-term solution of deflection taking into account the nonlinear buckling shape is chosen, the governing nonlinear dynamic equations of eccentrically stiffened functionally graded circular cylindrical shells subjected to time dependent axial compression and external pressure is established in part 1. In this study, the nonlinear dynamic responses are obtained by fourth order Runge-Kutta method and the nonlinear dynamic bu

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14

Li, Jieli, Michael A. Mkrtschjan, Ying-Hsi Lin, and Brenda Russell. "Variation in stiffness regulates cardiac myocyte hypertrophy via signaling pathways." Canadian Journal of Physiology and Pharmacology 94, no. 11 (2016): 1178–86. http://dx.doi.org/10.1139/cjpp-2015-0578.

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Much diseased human myocardial tissue is fibrotic and stiff, which increases the work that the ventricular myocytes must perform to maintain cardiac output. The hypothesis tested is that the increased load due to greater stiffness of the substrata drives sarcomere assembly of cells, thus strengthening them. Neonatal rat ventricular myocytes (NRVM) were cultured on polyacrylamide or polydimethylsiloxane substrates with stiffness of 10 kPa, 100 kPa, or 400 kPa, or glass with stiffness of 61.9 GPa. Cell size increased with stiffness. Two signaling pathways were explored, phosphorylation of focal

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15

Pruyn, Elizabeth C., Mark Watsford, and Aron Murphy. "The relationship between lower-body stiffness and dynamic performance." Applied Physiology, Nutrition, and Metabolism 39, no. 10 (2014): 1144–50. http://dx.doi.org/10.1139/apnm-2014-0063.

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Greater levels of lower-body stiffness have been associated with improved outcomes for a number of physical performance variables involving rapid stretch-shorten cycles. The aim of this study was to investigate the relationship between several measures of lower-body stiffness and physical performance variables typically evident during team sports in female athletes. Eighteen female athletes were assessed for quasi-static stiffness (myometry) for several isolated muscles in lying and standing positions. The muscles included the medial gastrocnemius (MedGast), lateral gastrocnemius, soleus, and

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16

Enferadi, Javad, and Mohammad Tavakolian. "Lagrangian Dynamics Analysis of a XY-Theta Parallel Robotic Machine Tool." Periodica Polytechnica Mechanical Engineering 61, no. 2 (2017): 107. http://dx.doi.org/10.3311/ppme.9368.

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Dynamics of a highly stiff parallel machine tool is the subject of this paper. High stiffness, good accuracy, relatively large workspace and free of singularities on the whole workspace makes the manipulator suitable for machining applications as an XY-Theta precision table. First, obtaining kinematics constraints, inverse kinematics analysis and velocity analysis are performed. Next, using six redundant generalized coordinates, we obtain Lagrangian of the manipulator. Also, a Lagrangian approach is proposed to obtain dynamics equations of the machine tool using three Lagrangian multipliers. T

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17

Ma, Ou, and Jiegao Wang. "Model order reduction for impact-contact dynamics simulations of flexible manipulators." Robotica 25, no. 4 (2007): 397–407. http://dx.doi.org/10.1017/s026357470600316x.

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SUMMARYDynamic simulation of a flexible manipulator performing physical contact (including low-speed impact) tasks with stiff environment is very time consuming because very small integration step sizes have to be used for numerical stability. Existing model order reduction techniques cannot be readily applied due to the nonlinear nature of the contact dynamics. In this paper, a method is introduced to deal with this problem. The method first linearizes the contact force model on the right-hand side of the dynamics equations periodically. It then identifies the linear “stiffness” and “damping”

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18

Wang, Rui, Hao Zhang, Xian Sheng Li, Xue Lian Zheng, and Yuan Yuan Ren. "Vehicle Dynamics Model Establishing and Dynamic Characteristic Simulation." Applied Mechanics and Materials 404 (September 2013): 244–49. http://dx.doi.org/10.4028/www.scientific.net/amm.404.244.

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By establishing bus simplify coordinate system model and equivalent mechanical model, inertial forces and external forces are analyzed through vehicle lateral movement and vehicle's yaw motion and roll motion. Three degrees of freedom linear motion equation of vehicle is established taking into account lateral motion, yawing movement and rolling motion of vehicle and it can be solved by using method of state space equation. Vehicle dynamic characteristics are analyzed by using this method and programming with Matlab. Vehicle in steering wheel angle step response is analyzed under the condition

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19

Mo, Shuai, Ting Zhang, Guoguang Jin, Zhanyong Feng, Jiabei Gong, and Shengping Zhu. "Dynamic Characteristics and Load Sharing of Herringbone Wind Power Gearbox." Mathematical Problems in Engineering 2018 (October 31, 2018): 1–24. http://dx.doi.org/10.1155/2018/7251645.

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In this study, the dynamic model for the herringbone planetary gear transmission system is established by the lumped parameter method based on the system dynamics and the Lagrange equation, and the impact of the support stiffness and the torsional stiffness on dynamic characteristics is studied. The research results have a guiding significance for the design of the herringbone gear transmission system. In this model, the herringbone gear is treated as a special gear coupled by 2 opposite helical gears, where the stagger angle, comprehensive meshing error, support stiffness, support damping, an

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20

Soegihardjo, Oegik, Suhardjono, Bambang Pramujati, and Agus Sigit Pramono. "Modal and Harmonic Response Analysis: Linear-Approach Simulation to Predict the Influence of Granular Stiffeners on Dynamic Stiffness of Box-Shaped Workpiece for Increasing Stability Limit against Chatter." Applied Mechanics and Materials 493 (January 2014): 501–6. http://dx.doi.org/10.4028/www.scientific.net/amm.493.501.

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Chatter is a self-excited vibration that occurs during machining process. It becomes a limitation to productivity and reduces the surface quality of work piece. Increasing dynamic stiffness of the work piece will improve its stability limit against chatter occurrence.Initial linear-approach simulation performing finite element modal and harmonic response analysis of the work piece filled with granular stiffener (sand and gravel) is presented. Drucker-Prager granular frictional material model is chosen to represent sand and gravel used as stiffener. Drucker-Prager parameters are chosen based on

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21

He, Jian, Ben Yang Wang, Ming Wei Zhu, and Hui Zhao Sun. "Dynamic Response on Stiffened Plate Subjected to Air Explosive Loading." Key Engineering Materials 486 (July 2011): 183–86. http://dx.doi.org/10.4028/www.scientific.net/kem.486.183.

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Stiffened plate is a common structure form in plate and shell structure. There are important theoretical significance and project application value on studying dynamic response of stiffened plate subjected to air explosive loading. The motion equation of orthotropic plate which subjected to explosive loading is established adopting Lagrange’s equation of motion, and the stiffened plate where the stiffener is arranged uniformly is treated as textural orthotropic plate. Then the motion equation of the orthotropic plate is converted into motion equation of the stiffened plate. Therefore the maxim

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22

Dulinska, Joanna M., and Katarzyna Nowakowska. "Influence of Structural Irregularities of Tserkov Building on its Dynamic Behavior under Induced Seismic Shock of Mining Origin." Key Engineering Materials 703 (August 2016): 365–70. http://dx.doi.org/10.4028/www.scientific.net/kem.703.365.

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In the paper the influence of structural irregularities of a building on its dynamic behavior under a mining tremor was examined. A building of tserkov was taken into consideration as an example of irregular building. The geometry and the material properties of the tserkov resulted in irregularities of the stiffness of structure: the massive concrete walls were much more stiffer than the floor slab and the structural columns. It turned out that the irregularities of structural stiffness strongly influenced the dynamic behaviour of the object. The stiff concrete walls repeated the ground motion

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23

Mukhopadhyay, M., and S. Goswami. "Transient finite element dynamic response of laminated composite stiffened shell." Aeronautical Journal 100, no. 996 (1996): 223–34. http://dx.doi.org/10.1017/s000192400006718x.

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AbstractThe paper uses the conventional nine-noded Lagrangian element for studying transient linear response analysis of composite stiffened shells. An improved version of the stiffener modelling has been used in which the stiffener can be placed anywhere inside the element. For the first time, concentric or eccentric stiffeners have been used for composite stiffened shells for solving the transient dynamic response of these structures. These are not available in existing commercial packages. Different types of time dependent loading such as short duration air-blast loading, suddenly applied u

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Wang, Feng Tao, Lu Tao Song, and Bin Zhang. "Analysis for Effect of Key Parts on Precision of High Precision Machine Center." Advanced Materials Research 189-193 (February 2011): 2107–11. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2107.

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Increasing the machining precision of machine tools has imposed higher demands for dynamic characteristics of the key components. Taking the MDH50 precision machining center as a example, this paper established the flexible body of five key components, bed, column, spindle boxes, slipway and worktable, and built the rigid-flexible coupling systems of whole machine, based on the basic theory of multi-body system dynamics. Then the cutting force reference to the actual constraints was applied to the system and the dynamics simulation was carried out. The effect of every component on machining pr

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25

Lan, Bo, Lu Wang, Jenny Zhang, et al. "Rho-kinase mediated cytoskeletal stiffness in skinned smooth muscle." Journal of Applied Physiology 115, no. 10 (2013): 1540–52. http://dx.doi.org/10.1152/japplphysiol.00654.2013.

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The structurally dynamic cytoskeleton is important in many cell functions. Large gaps still exist in our knowledge regarding what regulates cytoskeletal dynamics and what underlies the structural plasticity. Because Rho-kinase is an upstream regulator of signaling events leading to phosphorylation of many cytoskeletal proteins in many cell types, we have chosen this kinase as the focus of the present study. In detergent skinned tracheal smooth muscle preparations, we quantified the proteins eluted from the muscle cells over time and monitored the muscle's ability to respond to acetylcholine (A

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26

Kashani, H., and A. S. Nobari. "Structural Nonlinearity Identification Using Perturbed Eigen Problem and ITD Modal Analysis Method." Applied Mechanics and Materials 232 (November 2012): 949–54. http://dx.doi.org/10.4028/www.scientific.net/amm.232.949.

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Identification of nonlinear behavior in structural dynamics has been considered here, in this paper. Time domain output data of system are directly used to identify system through Ibrahim Time Domain (ITD) modal analysis method and perturbed eigen problem. Cubic stiffness and Jenkins element, as case studies, are employed to qualify the identification method. Results are compared with Harmonic Balance (HB) estimation of nonlinear dynamic stiffness. Results of ITD based identification are in good agreement with the HB estimation, for stiffness parts of nonlinear dynamic stiffness but for dampin

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27

Lanz, O., R. McLaughlin, S. Elder, S. Werre, and D. Filipowicz. "A biomechanical comparison of 3.5 locking compression plate fixation to 3.5 limited contact dynamic compression plate fixation in a canine cadaveric distal humeral metaphyseal gap model." Veterinary and Comparative Orthopaedics and Traumatology 22, no. 04 (2009): 1–8. http://dx.doi.org/10.3415/vcot-08-05-0042.

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Summary3.5 locking compression plate (LCP) fixation was compared to 3.5 limited contact dynamic compression plate (LC-DCP) fixation in a canine cadaveric, distal humeral metaphyseal gap model. Thirty paired humeri from adult, large breed dogs were separated into equal groups based on testing: static compression, cyclic compression, and cyclic torsion. Humeral constructs stabilized with LCP were significantly stiffer than those plated with LCDCP when loaded in static axial compression (P = 0.0004). When cyclically loaded in axial compression, the LCP constructs were significantly less stiff tha

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28

Zeng, Zhi-Ping, Yan-Cai Xiao, Wei-Dong Wang, et al. "The Influence of Track Structure Parameters on the Dynamic Response Sensitivity of Heavy Haul Train-LVT System." Applied Sciences 11, no. 24 (2021): 11830. http://dx.doi.org/10.3390/app112411830.

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Background: In order to study the applicability of Low Vibration Track (LVT) in heavy-haul railway tunnels, this paper carried out research on the dynamic effects of LVT heavy-haul railway wheels and rails and provided a technical reference for the structural design of heavy-haul railway track structures. Methods: Based on system dynamics response sensitivity and vehicle-track coupling dynamics, the stability of the upper heavy-haul train, the track deformation tendency, and the dynamic response sensitivity of the vehicle-track system under the influence of random track irregularity and differ

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29

Yin, Xuewen, Wenwei Wu, Hui Li, and ，Kuikui Zhong. "Vibration Transmission within Beam-stiffened Plate Structures Using Dynamic Stiffness Method." Procedia Engineering 199 (2017): 411–16. http://dx.doi.org/10.1016/j.proeng.2017.09.133.

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Yuan, Zhe, Fei Fan, and Xiaotian Bai. "Nonlinear dynamics analysis of a gear system considering tooth contact temperature and dynamic wear." Advances in Mechanical Engineering 14, no. 9 (2022): 168781322211210. http://dx.doi.org/10.1177/16878132221121056.

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Increased temperature and surface wear of high-speed and heavy-load gears are inevitable. Thermal deformation and surface wear modify the position of the action line of the tooth surface and thus influence the dynamic characteristics of the gear mesh. In this study, the elastic modulus and tooth profile thermal deformation were calculated when the tooth contact temperature (TCT) increased. A dynamic wear calculation method was used to combine the dynamic mesh force and dynamic wear coefficient caused by the dynamic mesh force obtained in the nonlinear dynamics model with the quasi-static wear

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31

Oyelade, Akintoye O. "Sound transmission through a stiff double-panel structure periodically stabilized by negative stiffness module: Theoretical modeling." Journal of Vibration and Control 26, no. 23-24 (2020): 2286–96. http://dx.doi.org/10.1177/1077546320921049.

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Analytic expressions are derived for models predicting the influence of periodically spaced structural links on sound transmission through a double-panel structure. The double panel has been configured to have two sets of structural links: a rib stiffener and negative stiffness component. The stiffener is identical and is spaced periodically at a distance. However, the negative element component is shifted by an amount q from the other set. The dynamic equation of the vibroacoustic of the system is formulated in terms of the space harmonics and by the principle of virtual work. The model is va

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Yang, Xiaodong, Chaodong Zhang, Wennian Yu, Wenbin Huang, Zhiliang Xu, and Chunhui Nie. "A Refined Dynamic Model for the Planetary Gear Set Considering the Time-Varying Nonlinear Support Stiffness of Ball Bearing." Machines 11, no. 2 (2023): 206. http://dx.doi.org/10.3390/machines11020206.

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Dynamics models of planetary gear sets (PGSs) are usually established to predict their dynamic behavior and load-sharing characteristics. The accurate modeling of bearing support stiffness is essential to study their dynamics. However, in most of the existing PGS dynamic models, the effect of characteristics coupling the rolling bearing time-varying nonlinear stiffness with the translational property of PGSs on the dynamic responses was completely neglected. To investigate this problem, a refined dynamic model for PGSs is proposed considering the coupled relationship between the radial transla

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Yang, Zemin, Xiaopeng Li, Jinchi Xu, Renzhen Chen, and Hexu Yang. "Study of Dynamic Performance and Control Strategy of Variable Stiffness Actuator System Based on Two-Inertial-System." Mathematics 11, no. 5 (2023): 1166. http://dx.doi.org/10.3390/math11051166.

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The study of position control for variable stiffness actuators is important for improving their energy efficiency and robustness. In this paper, for the previously proposed nonlinear variable stiffness actuator, firstly, a dynamic model of the variable stiffness actuator system is established based on a two-inertia-system theory. Secondly, the effects of friction and gravity factors on the dynamic performance of the system are analyzed. The results of the study show that friction and gravity have obvious effects on the dynamic characteristics of the system in the constant stiffness state, and

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Du, Chao, Jun Zhang, Dun Lu, Huijie Zhang, and Wanhua Zhao. "A parametric modeling method for the pose-dependent dynamics of bi-rotary milling head." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 232, no. 5 (2016): 797–815. http://dx.doi.org/10.1177/0954405416654599.

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Bi-rotary milling head is one of the core components of five-axis machining center, and its dynamic characteristics directly affect the machining stability and accuracy. During the sculptured surface machining, the bi-rotary milling head exhibits varying dynamics in various machining postures. To facilitate rapid evaluation of the dynamic behavior of the bi-rotary milling head within the whole workspace, this article presents a method for parametrically establishing dynamic equation at different postures. The rotating and swing shafts are treated as rigid bodies. The varying stiffness of the f

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Hu, Yong, and David B. Bogy. "Dynamic Stability and Spacing Modulation of Sub-25 nm Fly Height Sliders." Journal of Tribology 119, no. 4 (1997): 646–52. http://dx.doi.org/10.1115/1.2833864.

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Designing a reliable sub-25 nm spacing head/disk interface for today’s magnetic hard disk drives demands a greater dynamic stability and a smaller spacing modulation. An air bearing dynamic simulator with multiple features is developed to investigate the dynamic characteristics of three shaped-rail negative pressure sub-25 nm fly height sliders. Various simulations including air bearing stiffness, impulse response, surface roughness induced spacing modulation, bump response, and track seeking dynamics are performed. The results indicate that the roughness induced spacing modulation decreases w

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Shi, Zhenghong, and Sheng Li. "Nonlinear dynamics of hypoid gear with coupled dynamic mesh stiffness." Mechanism and Machine Theory 168 (February 2022): 104589. http://dx.doi.org/10.1016/j.mechmachtheory.2021.104589.

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37

Klamecki, B. E. "On the Effects of Turning Process Asymmetry on Process Dynamics." Journal of Engineering for Industry 111, no. 3 (1989): 193–98. http://dx.doi.org/10.1115/1.3188749.

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The implications of a fundamental asymmetry in the lathe turning process are considered. The asymmetry is the directional dependence of system stiffness that exists at the cutting tool edge. Depending on tool edge displacement, the system stiffness is determined by the workpiece stiffness or the relatively much stiffer tool support structure. A one degree-of-freedom, lumped parameter model with nonlinear stiffness is constructed and subjected to a periodic forcing. Time and frequency domain analyses show that extremely complex dynamic behavior can occur in this simple system.

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Le, Lily Thao-Nhi, Oscar Cazares, Janna K. Mouw, et al. "Loss of miR-203 regulates cell shape and matrix adhesion through ROBO1/Rac/FAK in response to stiffness." Journal of Cell Biology 212, no. 6 (2016): 707–19. http://dx.doi.org/10.1083/jcb.201507054.

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Breast tumor progression is accompanied by changes in the surrounding extracellular matrix (ECM) that increase stiffness of the microenvironment. Mammary epithelial cells engage regulatory pathways that permit dynamic responses to mechanical cues from the ECM. Here, we identify a SLIT2/ROBO1 signaling circuit as a key regulatory mechanism by which cells sense and respond to ECM stiffness to preserve tensional homeostasis. We observed that Robo1 ablation in the developing mammary gland compromised actin stress fiber assembly and inhibited cell contractility to perturb tissue morphogenesis, wher

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Rincón-Morantes, Jhon Fredy, Allex E. Alvarez, and Oscar J. Reyes-Ortiz. "Estimación de la rigidez de materiales granulares marginales no ligados mediante ensayo CBR dinámico." Ingeniería y Desarrollo 40, no. 01 (2022): 92–113. http://dx.doi.org/10.14482/inde.40.01.621.992.

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La evaluación en laboratorio de la respuesta de materiales granulares no ligados (e.g., subbases- y bases-granulares para pavimentación) bajo carga dinámica es limitada en Colombia. Este estado de la práctica se relaciona, entre otros aspectos, con que el equipo triaxial dinámico requerido para su determinación es costoso y los protocolos de ensayo complejos. Como alternativa, en la última década se han realizado desarrollos sobre el ensayo CBR dinámico (dCBR), que emplea el equipo, pero modifica el protocolo del ensayo de CBR convencional. Esta investigación propone las bases de un nuevo prot

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Gupta, Tikam Chand. "Parametric studies on dynamic stiffness of ball bearings supporting a flexible rotor." Journal of Vibration and Control 25, no. 15 (2019): 2175–88. http://dx.doi.org/10.1177/1077546319856147.

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Most of the researchers in the field of dynamics of the rolling element bearing have considered bearing stiffness as time invariant and/or not related to dynamics of the bearing. In the present paper, the bearing stiffness has been taken as function of dynamic response at every time step of numerical simulation and a detailed parametric study is performed to investigate the effect of flexibility of the rotor shaft, rotational speed, and internal radial clearance on the instantaneous and average value of dynamic stiffness of the ball bearing. The mathematical formulation is based on the Timoshe

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Wang, Peng, Yifeng Zhong, Zheng Shi, Dan Luo, and Qingshan Yi. "Estimating of the Static and Dynamic Behaviors of Orthogrid-Stiffened FRP Panel Using Reduced-Order Plate Model." Materials 14, no. 17 (2021): 4908. http://dx.doi.org/10.3390/ma14174908.

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The orthogrid-stiffened FRP panel (OSFP) is a generic structural element in weight-sensitive structure applications. Based on the variational asymptotic method, a 2D reduced-order plate model (2D-RPM) of OSFP was constructed through matching the strain energy of the original panel for static and dynamic analyses. The local field distributions were recovered using the recovery relationship and global response. The relative influences of select parameters on the effective performance of the OSFP were revealed by parametric studies. The comparative results showed that the effective performance of

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Xu, Liufeng. "Mathematical Modeling and Characteristic Analysis of the Vertical Stiffness for Railway Vehicle Air Spring System." Mathematical Problems in Engineering 2020 (June 8, 2020): 1–12. http://dx.doi.org/10.1155/2020/2036563.

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Establishing a correct and reliable vertical stiffness model has an important significance on reproducing the characteristics of an air spring system. In this paper, a dynamic vertical stiffness model is developed based on thermodynamics and fluid dynamics, and geometric parameters are identified by an approximate analytical method. Meanwhile, experimental tests are performed to verify the accuracy and reliability of the proposed model. Furthermore, the impact of geometric parameters on the vertical stiffness characteristics is discussed through a sensitivity analysis. The conclusions show tha

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Langley, R. S. "A dynamic stiffness technique for the vibration analysis of stiffened shell structures." Journal of Sound and Vibration 156, no. 3 (1992): 521–40. http://dx.doi.org/10.1016/0022-460x(92)90742-g.

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BANERJEE, J. R. "DYNAMIC STIFFNESS FORMULATION AND FREE VIBRATION ANALYSIS OF CENTRIFUGALLY STIFFENED TIMOSHENKO BEAMS." Journal of Sound and Vibration 247, no. 1 (2001): 97–115. http://dx.doi.org/10.1006/jsvi.2001.3716.

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Li, Hui, Xuewen Yin, and Wenwei Wu. "Dynamic stiffness formulation for in-plane and bending vibrations of plates with two opposite edges simply supported." Journal of Vibration and Control 24, no. 9 (2016): 1652–69. http://dx.doi.org/10.1177/1077546316667205.

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A dynamic stiffness formulation is developed for both in-plane and bending vibrations of plates with two opposite edges simply supported. The bending motions of plates are described in terms of Leissa’s displacement functions while the in-plane motions take the forms take the forms that were proposed by Bercin and Langley. Using Projection Method, the forces and their corresponding displacements along plate junctions are projected onto a set of orthogonal functions, by which means the well-known spatial dependence difficulties can be overcome, and, as a result, local dynamic stiffness matrix i

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Capanni, Felix, Kirk Hansen, Daniel C. Fitzpatrick, Steven M. Madey, and Michael Bottlang. "Elastically Suspending the Screw Holes of a Locked Osteosynthesis Plate Can Dampen Impact Loads." Journal of Applied Biomechanics 31, no. 3 (2015): 164–69. http://dx.doi.org/10.1123/jab.2014-0193.

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Impact damping by elastic fixation is a principal engineering strategy to increase the durability of load-bearing structures exposed to prolonged dynamic loading. This biomechanical study evaluated axial impact damping provided by a novel dynamic locking plate. In this design, locking screw holes are elastically suspended within a silicone envelope inside the locking plate. Axial impact damping was assessed for 3 distinct fixation constructs applied to bridge a 10-mm fracture gap of a femoral diaphysis surrogate: a standard locking plate, a dynamic locking plate, and an Ilizarov ring fixator.

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Luo, Haitao, Jia Fu, Changshuai Yu, Guangming Liu, Wei Wang, and Peng Wang. "Numerical simulation and experimental testing of dynamic stiffness of angular contact ball bearing." Advances in Mechanical Engineering 10, no. 9 (2018): 168781401879897. http://dx.doi.org/10.1177/1687814018798973.

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Angular contact ball bearings are widely used in the multiple rotor system, such as gear box, machine tool spindle, and aero-engine rotors. The support stiffness is very important to the vibration of shafting. In order to obtain the dynamic stiffness, a numerical simulation method for dynamic stiffness of angular contact ball bearings is presented. By means of LS-DYNA software, the displacement and stress curves of the bearing’s different components are obtained successfully, and then, the dynamic stiffness of bearing under certain working conditions also can be calculated. The maximum envelop

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Webber, Christina M., and Kenton Kaufman. "Instantaneous stiffness and hysteresis of dynamic elastic response prosthetic feet." Prosthetics and Orthotics International 41, no. 5 (2016): 463–68. http://dx.doi.org/10.1177/0309364616683980.

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Background:Dynamic elastic response prosthetic feet are designed to mimic the functional characteristics of the native foot/ankle joint. Numerous designs of dynamic elastic response feet exist which make the prescription process difficult, especially because of the lack of empirical evidence describing the objective performance characteristics of the feet.Objectives:To quantify the mechanical properties of available dynamic elastic response prosthetic feet, specifically the stiffness and hysteresis.Study design:Mechanical testing of dynamic elastic response prosthetic feet.Methods:Static Proof

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Weaver, Valerie M. "Abstract SY23-01: Targeting the reciprocal interplay between inflammation, fibrosis, and pro-tumor immunity." Cancer Research 82, no. 12_Supplement (2022): SY23–01—SY23–01. http://dx.doi.org/10.1158/1538-7445.am2022-sy23-01.

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Abstract Tumors are characterized by increased levels of remodeled and crosslinked extracellular matrix (ECM) proteins that progressively stiffen the tissue stroma. Transformed cells exhibit a perturbed oncogene-stimulated and ECM-tuned mechanophenotype that further stimulates ECM remodeling and stiffening. We have been exploring how these aberrant cell and tissue level forces arise and by what means these forces contribute to malignancy and metastasis, and how they promote tumor recurrence and treatment resistance. We use two and three dimensional culture models with tuned ECM stiffness, as w

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Wu, Nan, Yuzhen Zhao, Qing Guo, and Yongshou Liu. "The effect of two-parameter of Pasternak foundations on the dynamics and stability of multi-span pipe conveying fluids." Advances in Mechanical Engineering 12, no. 11 (2020): 168781402097453. http://dx.doi.org/10.1177/1687814020974530.

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In this paper, the dynamics and stability of multi-span pipe conveying fluid embedded in Pasternak foundation is studied. Based on Euler-Bernoulli beam theory, the dynamics of multi-span pipe conveying fluid embedded in two parameters Pasternak foundation is analyzed. The dynamic stiffness method (DSM) is used to solve the control equation. A seven span pipe is calculated. The affection of two parameters of Pasternak foundation is mainly studied. Along with increasing the elastic stiffness K and shear stiffness G, the frequency is also increasing.

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