Zeitschriftenartikel: „Dynamic rigidity“

1

Song, Lu, und J. Michael Schurr. „Dynamic bending rigidity of DNA“. Biopolymers 30, Nr. 3-4 (1990): 229–37. http://dx.doi.org/10.1002/bip.360300302.

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2

Hou, Ya Li, und Wei Ping Mao. „Analysis of Static and Dynamic Stiffness for Coupled Double-Rotor Spindle System of High Speed Grinder“. Key Engineering Materials 522 (August 2012): 278–82. http://dx.doi.org/10.4028/www.scientific.net/kem.522.278.

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This study was focused on the theoretical modeling and numerical investigation about the dynamic and static stiffness of coupled double-rotor spindle system of high speed grinder. The moment balance and the transition matrix, the state vector, field matrix of spindle system of high speed grinder were analyzed and deduced. The theoretical models about dynamic and static stiffness were established using the transfer matrix method. The numerical results showed that increased rigidity of front bearing significantly increased static and dynamic rigidity of spindle end and the rigidity of front bearing increased, dynamic rigidity increased more significantly than static rigidity. Furthermore, it can be conclued that increased overhang length reduced dynamic and static rigidity of spindle end at an increasingly slower rate and the span of bearing increased, static and dynamic rigidities of spindle end were reduced

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3

Ye, L., D. A. Weitz, Ping Sheng, S. Bhattacharya, J. S. Huang und M. J. Higgins. „Dynamic rigidity percolation in inverted micelles“. Physical Review Letters 63, Nr. 3 (17.07.1989): 263–66. http://dx.doi.org/10.1103/physrevlett.63.263.

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4

Weber, Barbara, Shazia Sadiq und Manfred Reichert. „Beyond rigidity – dynamic process lifecycle support“. Computer Science - Research and Development 23, Nr. 2 (22.04.2009): 47–65. http://dx.doi.org/10.1007/s00450-009-0069-5.

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5

Liu, Shi Hao, Wen Hua Ye, Wei Fang Chen und Ting Zhang. „Simulation and Experiment Study for Spindle of Numerical Control Machine Tool“. Applied Mechanics and Materials 16-19 (Oktober 2009): 1289–93. http://dx.doi.org/10.4028/www.scientific.net/amm.16-19.1289.

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Processing precision of numerical control machine tool is decided by static rigidity and dynamic rigidity of spindle to a great extent. 3- D model of numerical control machine tool was established by using parametric modeling and virtual assembly function of Solidworks. Simultaneously, simulation and Experiment study of the spindle static rigidity was carried out, and practicability of the simulation analysis method was proved. The result indicates that the biggest deformation appears in the front of spindle. The static rigidity of spindle can been enhanced greatly by enhancing three carriage-feed system’s static rigidity of machine tool. The simulation for the dynamic rigidity of spindle indicates that the dynamic rigidity of spindle is uniformly distributed and resonance can be avoided effectively by the spindle when working.

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6

Tsuruta, K., und K. Kojima. „Dynamic Design Procedure for HVAC Ducts“. Journal of Pressure Vessel Technology 110, Nr. 4 (01.11.1988): 413–21. http://dx.doi.org/10.1115/1.3265624.

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Design layout of ducts and supports systems which make up the heating, ventilating and air-conditioning systems (HVAC) is based upon the Japanese Industrial standard (JIS)[1] for hanger support systems conforming to SMACNA[2] standards of high-rigidity design, where emphasis is placed on buildings containing duct systems. However, since high-rigidity systems involve raising the rigidity of the total system, the weight and number of support structures have to be increased, thus posing economic problems. On the other hand, hanger systems are problematic due to their structural weakness. Therefore, we have tried to apply low-rigidity ducts and a support system which rely heavily on the strength of the ducts themselves. To accomplish this we tried to lengthen the duct support span, to lighten the support structures, and to establish a reasonable design method for the duct system. Further, the effectiveness of the present design margin can be confirmed by a duct system test using a shaker table. Our study mainly consisted of experiments: performing duct element tests to study rigidity and strength, using the shaker table to estimate dynamic characteristics and response characteristics of a duct system model, and studying the calculations of the duct beam model.

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7

Shan, Li Jun, Wei Dong He und Tian Min Guan. „Analysis of Nonlinear Characteristics of Double-Crank Ring-Plate-Typed Pin-Cycloid Gear Planetary Drive“. Advanced Materials Research 44-46 (Juni 2008): 711–16. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.711.

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Double-crank ring-plate-typed pin-cycloid gear planetary drive conquers shortcomings of a traditional pin-cycloid gear planetary drive, whose load-capacity is restricted by rotation-arm bearing dimension. The load-capacity of this kind of new drive is improved greatly and the efficiency of whole machine is 94%. In order to know dynamics reliability of this drive , nonlinear characteristics of double-crank ring-plate-typed pin-cycloid gear planetary drive are analyzed from two sides of transmission error and dynamic meshing process in this paper. A sensitive analytic mathematic model of rod dimension error is set up by kinematics theory. Based on ring-plate-type cycloid drive dynamic meshing characteristics, a rigidity-flexibility combined model of pin-cycloid planetary drive is set up by ANSYS/LS-DYNA module. Meshing process between pin-cycloid gear is simulated by FEM. Instantaneous stress, distortion and dynamic meshing rigidity are computed. Analytical results show that nonlinear meshing rigidity and transmission errors are two main dynamic exciters which cause prototype to vibrate. So, rod dimension error should be reduced in order to increase meshing accuracy, and meshing rigidity of new prototype should be increased in order to reduce vibration. Nonlinear characteristics of the drive can offer some theoretical bases for design of new prototype.

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8

Bao, Limin, Masayuki Takatera und Akira Shinohara. „Dynamic and Static Flexural Rigidity of Fabric.“ Sen'i Gakkaishi 49, Nr. 12 (1993): 642–47. http://dx.doi.org/10.2115/fiber.49.12_642.

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9

YATSUN, E. I., О. S. ZUBKOVA, A. V. GORDEYKOV und D. A. ZUBKOV. „INCREASING THE DYNAMIC RIGIDITY OF BORING BARS“. Fundamental and Applied Problems of Engineering and Technology 3 (2020): 45–49. http://dx.doi.org/10.33979/2073-7408-2020-341-3-45-49.

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The article presents the design of an anti–vibration holder, the use of which in the processing of materials by cutting will reduce the level of self–generated vibrations that occur in tool systems. The advantages of the holder are the simplicity of construction and installation of the damping element; the ability to install various types of cutting heads on the holder. As an example, the possibility of using a holder when boring a hole in a thin–walled part is considered. A fragment of the part drawing and the boring scheme is shown. The influence of processing conditions on the tool deviation from the processed surface is studied. Graphs of the dependencies of the deflection of the forming point on the radial component of the cutting force, the departure of the holder, the diameter of the holder, and the elastic modulus of the holder material are constructed. Conclusions are made about the applicability of such holders.

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10

Lu, Zhi Gang, Guo Jian Li und Wen Wu Jiang. „Analysis of Dynamic Performance Testing of Bridge Based on Finite Element and Dynamic Load Test“. Applied Mechanics and Materials 178-181 (Mai 2012): 2323–28. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.2323.

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Using the Jianninxia Bridge as the experiment object, we set dynamic loading test on it, and did theoretical analysis on its natural vibration characteristics by using large-scale general finite-element software. After the comparative analysis between the collected datas and the theoretical analysis datas, we find that the measurement of the natural vibration frequency is greater than the theoretical analysis value; and the measured value of impact coefficient is less than the theoretical value; therefore, it indicates that this bridge’s actual structural rigidity is greater than its theoretical rigidity, but lack of the impact resistance.

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11

Frohrib, D. A., I. Goldstein, T. R. Payton, H. Padma-Nathan und R. J. Krane. „Characterization of Penile Erectile States Using External Computer-Based Monitoring“. Journal of Biomechanical Engineering 109, Nr. 2 (01.05.1987): 110–14. http://dx.doi.org/10.1115/1.3138651.

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The states of penile erection have not been quantified to establish their relationship to intracorporal fluid pressure and to soft tissue constraint. Computer-based circumferential rigidity sensing during erectile cycles now permits circumferential size and rigidity characterization. Measurements during dynamic infusion cavernometry and cavernosography relate intracorporal pressure and axial rigidity to circumference and circumferential rigidity characterization. Tumescence/rigidity coupling and tissue elastic contributions are identified from the combined data.

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12

Świć, Antoni, Victor Taranenko, Arkadiusz Gola und Marek Opielak. „Dynamic System of Grinding of Low-Rigidity Shafts“. Applied Mechanics and Materials 791 (September 2015): 281–89. http://dx.doi.org/10.4028/www.scientific.net/amm.791.281.

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The paper presents a methodology of building a mathematical model of dynamic system of shaft grinding under the condition of elastic strain, and the model itself. The model was worked out basing on analytical identification. The system of equations and general structural pattern of MM system of dynamic grinding are introduced. Such prepared system of equations and structural pattern of MM takes into account the geometry of machined layer and forces of cutting during the grinding, elastic properties of DS and the process of forming the section of the machined layer (ML). The specification of DS identifying for grinding the small stiffness shafts is shown.

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13

Matlin, M. M., V. A. Kazankin, E. N. Kazankina und A. I. Mozgunova. „Contact Rigidity of Paired Surfaces in Dynamic Loading“. Russian Engineering Research 40, Nr. 9 (September 2020): 732–35. http://dx.doi.org/10.3103/s1068798x20090117.

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14

Spivak, A. A., und V. M. Khazins. „Variation in fracture zone rigidity by dynamic effects“. Doklady Earth Sciences 449, Nr. 1 (März 2013): 328–31. http://dx.doi.org/10.1134/s1028334x13030082.

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15

Chen, G. R. „Dynamic Model for Market Competition and Price Rigidity“. Applied Economics 48, Nr. 36 (04.02.2016): 3485–96. http://dx.doi.org/10.1080/00036846.2016.1139681.

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16

Tornyos, Á. „Dynamic Analysis of Space Frameworks with Cyclic Symmetry“. International Journal of Space Structures 1, Nr. 2 (Juni 1985): 111–15. http://dx.doi.org/10.1177/026635118500100207.

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This paper examines the structural rigidity of space frameworks having n-fold rotational symmetry as well as a plane of mirror symmetry passing through the axis of rotational symmetry. On the basis of the eigenfrequencies and eigenvectors of the elastic structure, the dynamic properties of single- and multi-storey space frameworks with rotational symmetry are analysed. It is also shown how the even or odd value of the order n of the rotational symmetry influences the rigidity of the structure.

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17

Sun, Hao, Xiao Gang Li und Shi Lin Liu. „Influence Analysis of Parameters Variation on Dynamic Characteristic for Concrete Filled Steel Tubulur Arch Bridge“. Applied Mechanics and Materials 361-363 (August 2013): 1429–32. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.1429.

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The main bridge of Zhengzhou Yellow River 2nd bridge is a concrete filled steel tubulur (CFST) arch bridge. Choosing the main bridge as the research object, the finite element procedure ANSYS was used to establish the 3D finite element dynamic model. In order to analyze the influence of structural Parameters variation on dynamic characteristic,17 different conditions were considered in the calculation and analysis process. The results show that the CFST arch bridge is a flexible structure. The vertical rigidity of the bridge is stronger than the lateral rigidity CFST arch rib. The changes of the transverse brace style have little effect on the vertical rigidity, but have great impacts on the lateral rigidity of the CFST arch rib. It is sensitive on the first step vibration if the bracing tube damage. But the bracing tube damage has little effect on the vertical rigidity. The damages of suspenders and bridge deck slabs influence weakly on the vibration modes.

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18

Yuan, Hui Qun, Ying Li, Dong Li und Wen Bo Wu. „The Control and Dynamical Analysis on Magnetic Bearing Flexible Rotor System Combining the Whirling with Swing“. Advanced Materials Research 189-193 (Februar 2011): 1592–96. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.1592.

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Considering gyroscopic effect and flexibility of the shaft, the eight freedoms dynamic model is established. The dynamic characteristic and control quantity in different bearing rigidity and rotation axis are studied and discussed by optimal control theory. Furthermore, the controlling and the responding are discussed. The simulation results show that the bearing rigidity has great effect on the control quantity so that the elasticity of bearing must be considered. The asymmetry rigidity of rotational axis has little influence on stability. The conclusion may bring up theoretical references for precision control for rotor magnetic bearing system.

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19

Liu, Lei, Yan Xuan, Lan Wang und Jia Lin Sun. „Theoretical Analysis and Simulation Study on Track Rigidity of Turnout“. Applied Mechanics and Materials 97-98 (September 2011): 235–40. http://dx.doi.org/10.4028/www.scientific.net/amm.97-98.235.

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Seriously inhomogeneous track rigidity of turnout will strengthen the dynamic response of wheel/rail system and shorten its service life. Combined with complicated structure characteristics of turnout, the simulation calculation model of track rigidity had been established. Main factors which influence the track rigidity were considered, such as the rail changing section, sharing baseplate, the foundation under rail. Distribution regularity of track rigidity in turnout had been obtained. The calculation result showed that track rigidity of turnout was seriously inhomogeneous. The maximum track rigidity was 162.2kN/mm in point rail of stock line, and the minimum track rigidity was 69.5kN/mm in stock rail of switch line.

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20

Cao, Xiao Ping. „Research on the Earthquake Dynamic Responses of Tunnel under Changing Tunnel Lining Rigidity“. Advanced Materials Research 250-253 (Mai 2011): 1978–82. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.1978.

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With the increasing of the quantity of the tunnel, more and more attentions have been paid to the tunnel destruction induced by earthquake. Based on the software of finite element, the finite element model for deeply buried tunnel have been set up; and the responses about different rigidity of tunnel lining under seismic dynamic load has been analyzed by using elastic finite element theory. The conclusions have been drawn that the change of seismic responses by increasing rigidity of tunnel lining is unobvious, and the method using increasing rigidity of tunnel lining to reduce the seismic responses of tunnel is uneconomical.

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21

Urbikain Pelayo, Gorka, David Olvera, A. Fernández, Adrián Rodríguez, I. Tabernero und Luis Norberto López de Lacalle. „Stability Lobes in Turning of Low Rigidity Components“. Advanced Materials Research 498 (April 2012): 231–36. http://dx.doi.org/10.4028/www.scientific.net/amr.498.231.

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An accurate prediction of the dynamic stability of a cutting system involves the implementation of tool geometry and cutting conditions on any model used for such purpose. This study presents a dynamic cutting force model based on the collocation method by Chebyshev polynomials taking advantage from its ability to consider tool geometry and cutting parameters. In the paper, a simple 1DOF model is used to forecast chatter vibrations due to the workpiece and tool, which are distinguished in separate sections. The proposed model is verified positively against experimental dynamic tests.

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22

Sawamura, Ryota, Shinya Ikenaga und Atsushi Matsubara. „Development of Dynamic Loading Device for Rotating Spindle of Machine Tools“. Key Engineering Materials 523-524 (November 2012): 544–49. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.544.

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High performance milling spindles, which have high rigidity and high speed, are required for high productive machining. In order to evaluate the rigidity change of the spindle, authors has been developed a magnetic loading device. This device provides attractive force in radial direction to a dummy tool attached to a spindle. By using this device, the static stiffness of the rotating spindle has been successfully evaluated. However the loading rate could not be controlled due to the electric response lag caused by the magnetic field. To solve this problem, electric response of the coil-tool system with the air gap is analyzed and the dynamic response is estimated. The air-gap's influence on the load was also evaluated. Based on the analysis, a dynamic loading test is designed carried out for the measurement of the rigidity of a machine tool spindle.

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23

Kosbolov, Serikbay, Yerlan Yeleukulov, Alfiya Atalykova, Algazy Zhauyt, Gulsara Yestemessova und Saltanat Yussupova. „Dynamics and rigidity of a manipulator with three DOFs“. MATEC Web of Conferences 226 (2018): 01020. http://dx.doi.org/10.1051/matecconf/201822601020.

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The problem of dynamic elastic four-link initial kinematic chain (IKC) of the load-bearing manipulator, which is the basis for various modifications are considered. Using the Lagrange operator for this system, equations of motion in matrix form are obtained. To determine the potential energy of an elastic four-link IKC manipulator, we use the formula for the elastic potential energy of a rectilinear homogeneous rod of length l. The cross-section of the rod is considered annular or circular. Solving the system of linear equations of motion on a computer using the ADAMS program, the results of the movement of links and cargo were obtained. Kinematics and dynamics are presented for a generic 3 DOFs Initial Kinematic Chain; with anthropometric data and the dynamics equations, simulations were performed to understand its behavior.

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24

Clilverd, Mark A., Craig J. Rodger, Tracy Moffat-Griffin und Pekka T. Verronen. „Improved dynamic geomagnetic rigidity cutoff modeling: Testing predictive accuracy“. Journal of Geophysical Research: Space Physics 112, A8 (August 2007): n/a. http://dx.doi.org/10.1029/2007ja012410.

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25

Suzuki, Soichiro, Masaru Moriya, Gen Yamada und Yukinori Kobayashi. „Dynamic Characteristics of Robotic Manipulator with Low-Rigidity Arm.“ Transactions of the Japan Society of Mechanical Engineers Series C 61, Nr. 586 (1995): 2508–13. http://dx.doi.org/10.1299/kikaic.61.2508.

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26

White, L. W. „Identification of flexural rigidity in a dynamic plate model“. Journal of Mathematical Analysis and Applications 144, Nr. 1 (November 1989): 275–303. http://dx.doi.org/10.1016/0022-247x(89)90373-9.

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27

Ghitescu, Marilena, Ion-Marius Ghitescu, Sorin Vlase und Paul Nicolae Borza. „Experimental Dynamic Rigidity of an Elastic Coupling with Bolts“. Symmetry 13, Nr. 6 (02.06.2021): 989. http://dx.doi.org/10.3390/sym13060989.

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The paper presents an elastic coupling with bolts and intermediary non-metallic elements, which allows for radial and axial deviation and can absorb shocks and torsional vibrations. The designed bolts have a particular shape of a circular area of a length equal to the width of the non-metallic element, a cylindrical area larger than the diameter of the cylindrical groove where the non-metallic elements are mounted, and a cylindrical area smaller than the threaded area to avoid stress concentrators and bolt breakage. The coupling represents a symmetrical piece, having two planes of symmetry. Therefore, the study of such a mechanical system can be considerably simplified considering the design and description of the repeating elements. The novelty of this coupling consists in the existence of an intermediate disc between two half-couplings (driving and driven half-coupling). The non-metallic elements with different shapes are made of different types of rubber, mounted on cylindrical bolts fixed by the driving half-coupling, transmitting the motion in both directions.

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28

Wang, Hui, und Yu Xin Wang. „Effect of Secondary Force on Rigidity of Oil Film of the Slipper Pair Based on Hydrostatic Support“. Advanced Materials Research 468-471 (Februar 2012): 1380–83. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.1380.

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Rigidity of oil film is an important hydrostatic support performance of the slipper pair. This paper establishes the mathematics model of hydrostatic support structure on the basis of considering secondary force. And establish the simulation model of rigidity of oil film by using the toolbox of Simulink. Study the dynamic characteristics of rigidity of oil film under the influence of secondary force through computer simulation. And reach a conclusion that the impact of secondary force on rigidity of oil film has a relationship with friction coefficient and work pressure.

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29

Fortini, Renata, Asmus Meyer-Plath, Dominic Kehren, Ulrich Gernert, Leonardo Agudo Jácome und Heinz Sturm. „Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy“. Fibers 8, Nr. 5 (12.05.2020): 31. http://dx.doi.org/10.3390/fib8050031.

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In this work the flexural rigidity of individual large diameter multi-walled carbon nanotubes (MWCNTs) was investigated. The bending modulus were obtained by detecting the resonance frequencies of mechanically excited cantilevered carbon nanotubes using the so-called dynamic scanning electron microscopy technique, and applying the Euler–Bernoulli beam theory. For the nanotubes studied, we determined a modulus of up to 160 GPa. This agrees with values reported by other authors for MWCNTs produced by catalytic chemical vapor deposition, however, it is 6-8 times smaller than values reported for single and multi-walled carbon nanotubes produced by arc-discharge synthesis. Toxicological studies with carbon nanotubes have been showing that inhaled airborne nanofibers that reach the deep airways of the respiratory system may lead to serious, asbestos-like lung diseases. These studies suggested that their toxicity critically depends on the fiber flexural rigidity, with high rigidity causing cell lesions. To complement the correlation between observed toxicological effects and fiber rigidities, reliable and routinely applicable measurement techniques for the flexural rigidity of nanofibers are required.

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30

Cheung, V. W. T., und W. K. Tso. „Eccentricity in irregular multistory buildings“. Canadian Journal of Civil Engineering 13, Nr. 1 (01.02.1986): 46–52. http://dx.doi.org/10.1139/l86-007.

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To evaluate the seismic torsional effect on multistory buildings, the concept of eccentricity is extended from single-story buildings to multistory buildings by defining the locations of the centers of rigidity at each floor. A practical procedure to locate the centers of rigidity and hence floor eccentricity is introduced. This procedure depends on the use of plane frame computer programs only and is suitable for use in design offices. The seismic torsional provisions in the National Building Code of Canada 1985 (NBCC 1985) explicitly emphasize that the code provisions apply to buildings where the centres of rigidity lie on a vertical axis only. By means of examples, it verifies the claim of NBCC 1985. Also, it shows that, for buildings with centers of rigidity scattered from a vertical axis, the code procedure may or may not apply. Therefore, one should interpret the condition of centers of rigidity located along a vertical axis to be a sufficient, but not a necessary, condition for the NBCC 85 code provisions to be applicable. Until the necessary conditions are known, dynamic analysis remains the most reliable method to assign the torsional effects to various portions of the building. Key words: building code, center of rigidity, dynamic analysis, eccentricity, irregular, multistory, seismic, torsion.

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31

Shi, Y. G., Xing Yu Zhao, Li Qiang Zeng, H. Y. Wang und Da Wei Zhang. „Dynamic Characteristic Analysis and Structural Modification of a 5-Axis Horizontal Machining Center Considering Joint Surface“. Materials Science Forum 697-698 (September 2011): 513–16. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.513.

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In order to make a 5-axis linkage horizontal machining center have better dynamic characteristics, considering the influence of joint surface, dynamic characteristic analysis is conducted to the machining tool. Based on finite element modal analysis results, the weak link is found and optimized. Through the finite element calculation and analysis, the structure rigidity obviously raises after optimization. This offers a new idea on how to improve the rigidity of complete machine of machining tool for later research.

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32

Świć, Antoni, Jarosław Zubrzycki und Victor Taranenko. „Modelling and Systemic Analysis of Models of Dynamic Systems of Shaft Machining“. Applied Mechanics and Materials 282 (Januar 2013): 211–20. http://dx.doi.org/10.4028/www.scientific.net/amm.282.211.

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The specifics of modelling the dynamic system of turning as well as straight and plunge grinding of low rigidity shafts is presented in the paper. Methodology of developing models while machining shafts in elastic-deformable condition is shown. The specifics of processing of low rigidity elements is taken into account by introducing equations of constraint reflecting additional elastic strain in equation describing the control force effect. Systemic analysis of the developed models is performed and main hierarchical structure levels are given.

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33

Yang, Ying, Yu Sheng Li und Fan Liang Meng. „Numerical Design and Analysis of a Certain White Bodywork“. Applied Mechanics and Materials 16-19 (Oktober 2009): 110–14. http://dx.doi.org/10.4028/www.scientific.net/amm.16-19.110.

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Develops a finite element model to analyze the dynamic/static sensitivities of a certain white bodywork, i.e., the sensitivities of its bodywork’s natural frequency, torsional stiffness and flexural rigidity and mass to the thickness of sheet to make the bodywork, thus finding out the main parts affecting greatly the dynamic and static characteristics of bodywork to optimize its structure design. According to the sizes of contribution the body mass will make to the natural frequency and torsional stiffness and flexural rigidity, an optimal conceptual design is given. This method provides an important reference for improving the dynamic performance of bodywork, lightening its weight and optimizing its design.

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34

Qiguo, Gong, und Shang Zhiyuan. „Rigidity and performance threshold: How routinization process affects dynamic capabilities“. African Journal of Business Management 12, Nr. 7 (14.04.2018): 161–71. http://dx.doi.org/10.5897/ajbm2018.8516.

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35

YAMANE, Yasuo, Kazuhiro YAMATO, Kou YANAGI und Norihiko NARUTAKI. „Simple Estimating Method of Dynamic Rigidity of Machining Center Spindle.“ Journal of the Japan Society for Precision Engineering 65, Nr. 1 (1999): 136–40. http://dx.doi.org/10.2493/jjspe.65.136.

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36

Webster, Kevin D., Ailey Crow und Daniel A. Fletcher. „An AFM-Based Stiffness Clamp for Dynamic Control of Rigidity“. PLoS ONE 6, Nr. 3 (08.03.2011): e17807. http://dx.doi.org/10.1371/journal.pone.0017807.

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37

Gang, Zhang, Xu Quan, Zhi Han-Li, Jiang Xiao-Ying und Ni Xiao-Ting. „Dynamic Rigidity Analysis of High-Speed Angular Contact Ball Bearing“. Journal of Applied Sciences 13, Nr. 10 (01.05.2013): 1704–9. http://dx.doi.org/10.3923/jas.2013.1704.1709.

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38

Glidle, Andrew, und A. Robert Hillman. „Dynamic film rigidity observations during electrochemical deposition of polybithiophene films“. Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 318, Nr. 1-2 (November 1991): 411–20. http://dx.doi.org/10.1016/0022-0728(91)85324-i.

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39

He, Guang Lin, und He Fei Tian. „Analysis of Dynamic Behavior of Zigzag Groove Setback Arming Device with Two Degree of Freedom“. Advanced Materials Research 317-319 (August 2011): 1739–44. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.1739.

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Focusing on the requirements of safety and reliability of fuze setback arming device of rocket-assisted projectile, a zigzag groove setback device with two degree of freedom was designed with Inventor 6. The dynamic simulation is developed under environment of VisualNastran. The optimum parameters of up inertia-cylinder mass, down inertia-cylinder mass, up inertia-spring rigidity and down inertia-spring rigidity were tested by orthogonal method and simulated. The results indicate that this setback device can effectively differentiate setback overload in launch and impact overload at service handling; credible arming time of fuze is about 128ms when the even overload of the rocket engine is 100g; the optimum mass of up inertia-cylinder and down inertia-cylinder are respectively 3.19g and 1.41g, the optimum rigidity of up inertia-spring and down inertia-spring are respectively 32.7 N/m and 21.8 N/m.

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Wang, Zhen Feng, und Ke Sheng Ma. „Character Analysis of Balance and Imbalance of Varying Rigidity of Rigid Pile Composite Foundation under Seismic Load“. Advanced Materials Research 1065-1069 (Dezember 2014): 19–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.19.

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Based on ABAQUS finite element analysis software simulation, the finite element model for dynamic analysis of rigid pile composite foundation and superstructure interaction system is established, which selects the two kinds of models, by simulating the soil dynamic constitutive model, selecting appropriate artificial boundary.The influence of rigid pile composite foundation on balance and imbalance of varying rigidity is analyzed under seismic loads. The result shows that the maximum bending moment and the horizontal displacement of the long pile is much greater than that of the short pile under seismic loads, the long pile of bending moment is larger in the position of stiffness change. By constrast, under the same economic condition, the aseismic performance of of rigid pile composite foundation on balance of varying rigidity is better than that of rigid pile composite foundation on imbalance of varying rigidity.

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Garcia, Ana-Cruz, Juan-Vicente Durá, José Ramiro, Juan-Victor Hoyos und Pedro Vera. „Dynamic Study of Insole Materials Simulating Real Loads“. Foot & Ankle International 15, Nr. 6 (Juni 1994): 311–23. http://dx.doi.org/10.1177/107110079401500606.

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A new methodology of biomechanical analysis of materials for shoe inserts is presented. This methodology is based on the determination of the loads applied to the materials in real situations and its simulation by means of a dynamic testing machine. Both the rigidity and the energy-absorbing characteristics of the materials are investigated as a function of frequency. This methodology is applied to the study of several commercially available viscoelastic materials intended for shoe inserts in the treatment and prevention of degenerative joint diseases. The influence of thickness is investigated as well as the frequency-dependent behavior of the materials studied. Significant differences between materials and different behavior as a function of thickness and frequency were found. Poron materials were found to have the lowest rigidity, good for adequate pressure distribution, while Noene showed the highest energy absorption. A careful selection of the thickness of Sorbothane was found to be necessary for avoiding flattening of the material.

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Chang, Jyh-Cheng, und Jui-Pin Hung. „Analytical and Finite Element Modeling of the Dynamic Characteristics of a Linear Feeding Stage with Different Arrangements of Rolling Guides“. Mathematical Problems in Engineering 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/454156.

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This study was aimed at investigating the dynamic behaviors of the linear driven feeding stage by means of the analytical and finite element modeling approaches. To assess the dynamic characteristics of the stages with different linear guide arrangements, the finite element model of the stages was created, in which the linear components with rolling interface were accurately modeled based on the Hertzian theory. On the other hand, the analytically mathematical model was derived to determine how the linear guide arrangement affects the dynamic characteristics of the stage. Results of the modal analysis show that the vibration behaviors of the positioning stage are dominated by the rigidity of the linear components and the platform. In addition, comparisons of the results from the two approaches further indicate that the platform rigidity is an important factor determining the accuracy of the prediction of the vibration frequencies by the analytically mathematical model. As a conclusion of the study, the analytically mathematical model can approximate well to the finite element model when the linear stage is designed with appropriate structure rigidity.

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Zhou, Hong Xia, und Bin Liu. „Characteristics Analysis and Optimization of Flying-Wing Vehicle Structure“. Advanced Materials Research 1077 (Dezember 2014): 177–84. http://dx.doi.org/10.4028/www.scientific.net/amr.1077.177.

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To study structural characteristics of flying-wing vehicle, static and dynamic model of half wing span, static and dynamic model of all wing span, optimization model were established. Based on associated static test and ground resonance test data, these models were modified to implement static, dynamic and optimization analysis. Results demonstrated that structural bending and torsional deformations are mainly at outer wing surface. Torsion at inner wing is positive, while torsion at outer wing is negative. Total spar axial force along the wing span increases gradually from inner wing to outer wing and then decreases gradually after reaching the inner-outer wing interface. After axial force is transmitted to the inner wing, it is going to concentrate at the rear spar obviously. Structural bending rigidity and torsional rigidity satisfy requirements of both static force and flutter, without flutter problem of main structural mode. Viewed from the optimization size, ±45° and 0° skin at inner-outer wing turn thickens significantly. This can increase structural bending and torsional rigidity, which is good for satisfying multiple constraints comprehensively.

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Wang, Rong Xia, Xiang Shang Chen, Fan Li und Shao Wei Zhao. „Study on the Influence of Beam Rigidity on Continuous Rigid Frame Bridge with Moving Vehicle“. Advanced Materials Research 446-449 (Januar 2012): 1067–70. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1067.

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The continuous rigid frame bridge has been applied widely in our country. But in recent years, over-deflection of beam in this bridge has become an serious problem. This may cause the redistribution of displacement and internal force of the whole structure, especially in dynamic load status. A two-dimensional pile-soil-bridge model is built up in ANSYS based on a factual bridge. The over-deflection is considered as the decrease of beam elastic modulus or rigidity. The displacement and internal force of key parts are analysed in static and dynamic vehicle load. The study shows that over-deflection will reduce the first three natural vibration frequency, weaken the sensitivity of bridge to dynamic load. In dynamic load status, the displacement and internal force will be influenced by beam rigidity.

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Huang, Qiang, und Xiao Fei Li. „Correlation and Significance Analysis Method on the Design Parameter for Dynamic Rigidity of Spindle System“. Applied Mechanics and Materials 251 (Dezember 2012): 51–55. http://dx.doi.org/10.4028/www.scientific.net/amm.251.51.

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In the dynamic design of spindle system, the better effect should be achieved by optimizing multi-parameters synthetically. A spindle system has numerous design parameters. It is not advisable to optimize every design parameter. So, it is quite essential to analyze the influence extent and their correlation of these design parameters on the system dynamic rigidity. Taking the hob spindle system of YK3610 as an example, an analyzing method based on the orthogonal test is introduced in this paper. In this analysis, the dynamics model of system is built by transfer matrix method. Finally, a multi-parameters optimizing demonstration is provided.

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Zhong, Zhen Yu. „Dynamic Behavior of Extra-High Building with Wind Load and Gravity Coupling Effect“. Advanced Materials Research 594-597 (November 2012): 969–72. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.969.

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Wind-gravity coupling effect(WGCE) is an evident phenomenon of extra high buildings. Cantilever model of tall building structure which includes bending and shear distortion is established in the paper. The equations of wind load and gravity coupling have been concluded and are dispersed into difference form. Amplitude frequency characteristic of the structure and vibration acted by simulated wind load are studied though calculation by Wilson-θ method. The result shows that gravity second order effect of extra-high buildings will be enhanced when ratio of gravity rigidity or ratio of bending and shearing rigidity increase.

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Holmes, Jeremy. „Brief dynamic psychotherapy“. Advances in Psychiatric Treatment 1, Nr. 1 (September 1994): 9–15. http://dx.doi.org/10.1192/apt.1.1.9.

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The notion of brief dynamic psychotherapy (BDP) may seem at first sight to be a contradiction in terms. ‘Dynamic’ is a Freudian psychoanalytic term implying conflictual psychological forces — an opposition between the conscious and unconscious mind, and the use of defence mechanisms to arrive at a compromise between them. The rigidity of the obsessional person whose self-expression is traded for security, the self-reproaches of the depressive reflecting inhibited aggression, the clinging of the phobic individual who lacks an inner sense of a secure base — these would be examples of the relationship between dynamic conflict and psychiatric symptoms. But the image of psychoanalysis conjures up a picture of prolonged and intensive couch-based therapy. How can this be brief?

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Zhen, Ming, Zhi Gang Jiang und Dian Yi Song. „A Dynamic Cylindrical Cavity Expansion Model for the Penetration of Confined Concrete Targets“. Applied Mechanics and Materials 341-342 (Juli 2013): 467–71. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.467.

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The anti-projectile performance of the confined concrete is better than that of the normal concrete. When the radius of the confining tube is relatively small, the confined concrete would be in comminuted stage during the penetrating process of projectiles. Based on the assumption that comminuted concrete materials obey Griffith strength theory, a finite cylindrical cavity expansion model for confined concrete targets is proposed. Numerical results show that the lateral confinement affects little on the cavity stress for relatively small confining rigidity, and the cavity stress increases significantly with the increase of the radius ratio of cavity to confining tube for relatively large lateral confining rigidity.

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Song, Xi, Yin Guang Wu, Jie Yu Li und Rong Zhen Zhao. „Vibration Characteristics Analysis of Wind Turbine Towers under Foundation Conditions“. Applied Mechanics and Materials 446-447 (November 2013): 721–27. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.721.

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Based on a kind of 1.5MW large-scale horizontal axis wind turbine tower, the mechanical modeling of a wind turbine tower-foundation is established, the static and dynamic analysis of the model is carried out by ANSYS software. The top displacement of the system is calculated by the static analysis to meet the design requirements in engineering. In dynamic analysis, each pile foundation is equivalent to a group of springs for the simulation of horizontal and vertical rigidity of the pile. The influence of top mass and foundation elasticity on wind turbine tower modes is analyzed, and calculated the natural frequency of the tower within a certain scope of rigidity in different directions about the piles foundation. The results show that the natural frequency of the wind turbine tower is influenced significantly by the mass on the tower top and foundation rigidity. The study provides a theoretical basis for optimal design of the wind turbine.

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Hu, Jin, Ruibin Mo, Xinxin Sheng und Xinya Zhang. „A self-healing polyurethane elastomer with excellent mechanical properties based on phase-locked dynamic imine bonds“. Polymer Chemistry 11, Nr. 14 (2020): 2585–94. http://dx.doi.org/10.1039/d0py00151a.

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