Journal articles: 'Simplified dynamic method'

1

Lin, Yueh-Jaw, and Hai-Yan Zhang. "Simplification of manipulator dynamic formulations utilizing a dimensionless method." Robotica 11, no. 2 (March 1993): 139–47. http://dx.doi.org/10.1017/s026357470001924x.

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SUMMARYThis paper presents a new approach for simplifying dynamic equations of motion of robot manipulators by using a nondimensionalization scheme. With this approach the dynamic analysis is done in a nondimensional space. That is, it is required to establish a dimensionless coordinate system in which the dynamic equations of motion of manipulators are formulated. The characteristic parameters of the manipulators are then defined by choosing proper physical quantities as basic units for nondimensionalization. Within the nondimensional space the Lagrange method is applied to the manipulator to obtain a set of general dimensionless equations of motion. This dimensionless dynamic formulation of manipulators leads to an easier way to simplify the dynamic formulation by neglecting insignificant terms using the order of magnitude comparison. The dimensionless dynamic model and its simplified version of PUMA 560 robot are implemented using the proposed approach. It is found that the simplified dynamic model greatly reduces the computation burden of the inverse dynamics. Simulation results also show that the simplified model is extremely accurate. This implies that the proposed nondimensional simplification emethod is reliable.

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Liang, Robert Y., and Abdallah I. Husein. "Simplified Dynamic Method for Pile‐Driving Control." Journal of Geotechnical Engineering 119, no. 4 (April 1993): 694–713. http://dx.doi.org/10.1061/(asce)0733-9410(1993)119:4(694).

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Kong, De Sen, Yan Qing Men, and Li Hua Wang. "A Simplified Computational Method of Lateral Dynamic Impedance of Single Pile." Advanced Materials Research 243-249 (May 2011): 2985–89. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2985.

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Research of the pile-soil interaction effect is a complicated issue in civil engineering. Using the principle of soil dynamics and structural dynamics, a simplified computational method for computing the lateral dynamic impedance of single pile embedded in layered non-homogeneous subsoil is established based on a certain assumptions. Both non-homogeneity of soil strata and softening effect of soil layer around pile during vibration as well as separation of pile-soil interface are simultaneously taken into account in the proposed computational method. The characteristics of the frequency-dependency of lateral dynamic stiffness and damping of pile are reproduced. It is shown through the comparative study on a numerical example that the numerical results of dynamic impedance of pile computed by the proposed method are relatively rational and can well agree with the computational and experimental results currently available.

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Zhao, Chongbin, and S. Valliappan. "Simplified Method for Dynamic Response of Tapered Structure." Journal of Engineering Mechanics 119, no. 7 (July 1993): 1486–92. http://dx.doi.org/10.1061/(asce)0733-9399(1993)119:7(1486).

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5

Kausel, Eduardo. "Simplified Method for Dynamic Response of Tapered Structure." Journal of Engineering Mechanics 121, no. 2 (February 1995): 346–50. http://dx.doi.org/10.1061/(asce)0733-9399(1995)121:2(346).

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Hughes, M., and A. Gh Podoleanu. "Simplified dynamic focus method for time domain OCT." Electronics Letters 45, no. 12 (2009): 623. http://dx.doi.org/10.1049/el.2009.0672.

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Scargiali, F., A. Busciglio, F. Grisafi, and A. Brucato. "Simplified dynamic pressure method for measurement in aerated bioreactors." Biochemical Engineering Journal 49, no. 2 (April 2010): 165–72. http://dx.doi.org/10.1016/j.bej.2009.12.008.

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8

Demec, Peter. "Simplified Dynamic Analysis of Grinders Spindle Node." Technological Engineering 11, no. 1 (December 1, 2014): 11–15. http://dx.doi.org/10.2478/teen-2014-0002.

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Abstract The contribution deals with the simplified dynamic analysis of surface grinding machine spindle node. Dynamic analysis is based on the use of the transfer matrix method, which is essentially a matrix form of method of initial parameters. The advantage of the described method, despite the seemingly complex mathematical apparatus, is primarily, that it does not require for solve the problem of costly commercial software using finite element method. All calculations can be made for example in MS Excel, which is advantageous especially in the initial stages of constructing of spindle node for the rapid assessment of the suitability its design. After detailing the entire structure of spindle node is then also necessary to perform the refined dynamic analysis in the environment of FEM, which it requires the necessary skills and experience and it is therefore economically difficult. This work was developed within grant project KEGA No. 023TUKE-4/2012 Creation of a comprehensive educational - teaching material for the article Production technique using a combination of traditional and modern information technology and e-learning.

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Zhang, Zhi Ying, Ying Li, and Qing Sun. "A Simplified Model of SSI Dynamic Analysis." Advanced Materials Research 446-449 (January 2012): 334–39. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.334.

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Aiming at the problem of dynamic analysis of SSI system, the dynamic influence of different parts of foundation soil is studied on the linear elastic assumption according to the actual mechanism of Soil-Structure Interaction (SSI); in addition, a simplified model on the condition of the lumped mass method is put forward and the corresponding motion equations of SSI system are built, which can be a reference for the structural seismic design method considering SSI effect.

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Liu, Zhiyuan, Hongseng Zou, Miao Hui, Chen Dapeng, and Guo Lin. "Dynamic Finite Element Model Updating for On-load Tap Changer based on Super-model." MATEC Web of Conferences 256 (2019): 04001. http://dx.doi.org/10.1051/matecconf/201925604001.

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A method is presented for dynamic model updating of on-load tap changer (OLTC). Based on a sensitivity-based optimization method, the initial simplified finite element (FE) model of OLTC component is updated using the analytical results of the FE super-model. The objective of model updating is to reduce the frequency difference between the simplified FE model and the super-model, and to make the simplified model accurately represent dynamic characteristics of the super-model. The updated simplified models can be further used in the modeling and analysis of the whole OLTC model. The results, taking the base of OLTC as example, indicate that the dynamic behavior of the updated simplified model match well with that of the super-model. Subsequently, the dynamic behavior of OLTC assembled with the updated parts is further predicted by modal analysis. The presented method improves the calculation efficiency, as well as accuracy, which has broad application prospects for dynamic prediction of complex structures in engineering.

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Zhang, Dewei, Hui Qi, Xiande Wu, Yaen Xie, and Jiangtao Xu. "The Quadrotor Dynamic Modeling and Indoor Target Tracking Control Method." Mathematical Problems in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/637034.

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A reliable nonlinear dynamic model of the quadrotor is presented. The nonlinear dynamic model includes actuator dynamic and aerodynamic effect. Since the rotors run near a constant hovering speed, the dynamic model is simplified at hovering operating point. Based on the simplified nonlinear dynamic model, the PID controllers with feedback linearization and feedforward control are proposed using the backstepping method. These controllers are used to control both the attitude and position of the quadrotor. A fully custom quadrotor is developed to verify the correctness of the dynamic model and control algorithms. The attitude of the quadrotor is measured by inertia measurement unit (IMU). The position of the quadrotor in a GPS-denied environment, especially indoor environment, is estimated from the downward camera and ultrasonic sensor measurements. The validity and effectiveness of the proposed dynamic model and control algorithms are demonstrated by experimental results. It is shown that the vehicle achieves robust vision-based hovering and moving target tracking control.

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Zhang, De-Wen, and Fu-Shang Wei. "Structural Eigenderivative Analysis Using Practical and Simplified Dynamic Flexibility Method." AIAA Journal 37, no. 7 (July 1999): 865–73. http://dx.doi.org/10.2514/2.7535.

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Gerstoft, Peter, and A. G. Davenport. "A simplified method for dynamic analysis of a guyed mast." Journal of Wind Engineering and Industrial Aerodynamics 23 (January 1986): 487–99. http://dx.doi.org/10.1016/0167-6105(86)90065-6.

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MADSEN, J. L., J. GRAFF, and S. FUGISANG. "A simplified method for processing dynamic images of gastric antrum." Nuclear Medicine Communications 21, no. 11 (November 2000): 1037–41. http://dx.doi.org/10.1097/00006231-200011000-00009.

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Zhang, De-Wen, and Fu-Shang Wei. "Structural eigenderivative analysis using practical and simplified dynamic flexibility method." AIAA Journal 37 (January 1999): 865–73. http://dx.doi.org/10.2514/3.14255.

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16

Gao, Lin, Sun Keming, and Lou Menglin. "A simplified method for the dynamic analysis of shell structures." Communications in Applied Numerical Methods 4, no. 2 (March 1988): 243–49. http://dx.doi.org/10.1002/cnm.1630040216.

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Koukouselis, Apostolos, Konstantinos Chatziioannou, Euripidis Mistakidis, and Vanessa Katsardi. "Development of an equivalent static method for the approximation of the dynamic response of offshore structures." Engineering Computations 36, no. 4 (May 13, 2019): 1121–41. http://dx.doi.org/10.1108/ec-08-2018-0386.

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Purpose The design of compliant towers in deep waters is greatly affected by their dynamic response to wave loads as well as by the geometrical and material nonlinearities that appear. In general, a nonlinear time history dynamic analysis is the most appropriate one to be applied to capture the exact response of the structure under wave loading. However, this type of analysis is complex and time-consuming. This paper aims to develop a simplified methodology, which can adequately approximate the maximum response yielded by a dynamic analysis by means of a static analysis. Design/methodology/approach Various types of time history dynamic analysis are first applied on a detailed structural model, ranging from linear to fully nonlinear, that are used as reference solutions. In the sequel, a simplified analysis model is formulated, capable of reproducing the response of the entire structure with significantly reduced computational cost. In the next stage, this model is used to obtain the linear and nonlinear response spectra of the structure. Finally, these spectra are used to formulate a simplified design approach, based on equivalent static loads. Findings This simplified design approach produces good results in cases that the response is mainly governed by the first eigenmode, which is the case when compliant towers are considered. Originality/value The present paper borrows ideas from the area of earthquake engineering, where simplified methodologies can be used for the design of a certain class of structures. However, the development of a simplified methodology for the approximation of the dynamic behavior of offshore structures under wave loading is a much more complex problem, which, to the authors’ knowledge, has not been addressed till now.

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Yang, Jing Bo, Jin Fei Zhao, and Jun Jiang. "The Simplified Analytical Method for Computing Dynamic Characteristics of Transmission Steel Towers." Applied Mechanics and Materials 105-107 (September 2011): 303–6. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.303.

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Based on vibration theory, simplified analytical methods for computing the first natural vibration frequency and mode of transmission steel tower are investigated, which has improved the currently applied method. The method for frequency includes parameters of lumped mass such as tower head or cross arm, and can show the influence of section of tower main leg. The method for mode considers tower height, root space and head width. Examples of some typical transmission steel towers show that the dynamic characteristics computed with the simplified analytical methods are close to those of the Finite Element Method. Then the methods given in this paper are superior to the present methods used in engineering and have a better generality, which are suitable to different tower type structures.

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Wang, Yao Yuan, Zhuo Yang Lyu, Liang Liang Wang, and Zhen Hua Yan. "Simplified Dynamics Modeling of Seat-Passenger in Vehicle Frontal Crash." Applied Mechanics and Materials 597 (July 2014): 544–50. http://dx.doi.org/10.4028/www.scientific.net/amm.597.544.

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To quickly predict the performance of the seat in frontal crash during the initial stage of the seat development, in this paper a simplified coupled dynamic model of seat-passenger interaction is established according to the dynamics analysis method of Lagrange, and the fourth order Runge-Kutta method is used to resolve differential equation. Moreover, the simulation of Madymo testifies the simplified coupled dynamic model of seat-passenger interaction in frontal crash. Therefore, this model will be effective and feasible in predicting the performance of the seat in frontal crash during the initial stage of the seat development, for example, the performance of anti-submarining protection.

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20

Hu, Jie, Jia Quan Feng, and Xi Nong Zhang. "Simplified Modeling Research of Reinforced Concrete Based on the Dynamic Stiffness Equivalence." Advanced Materials Research 446-449 (January 2012): 458–62. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.458.

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This paper proposed a simplified modeling method of reinforced concrete based on the equivalence of dynamic stiffness, the parameters of simplified model were modified to make the error of nature frequency between reference model and simplified model as small as possible, and an appropriate optimization function was designed. The essentiality of the proposed method is parameter optimization, with the advantages such as fewer elements and calculation assumption. The numerical simulation result indicated that this optimization method is suitable for the dynamic response analysis of complicated reinforced concrete structure.

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21

Lou, Menglin. "The static substructure method for dynamic analysis of structures." Bulletin of the New Zealand Society for Earthquake Engineering 20, no. 4 (December 31, 1987): 264–68. http://dx.doi.org/10.5459/bnzsee.20.4.264-268.

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In this paper, the static substructure method based on the Ritz vector direct superposition method is suggested for analysing the dynamic response of structures. The advantage of this algorithm is that the computer cost can be reduced and the static analysis and the dynamic analysis of large structures can be simplified by using the identical static substructure method.

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Cianetti, Filippo, Luca Fabellini, Valerio Formica, and Francesco Ambrogi. "Development and validation of a simplified automotive steering dynamic model." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 235, no. 8 (January 9, 2021): 2188–99. http://dx.doi.org/10.1177/0954407020984668.

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This paper describes an innovative analytic/numerical method for modeling steering systems for automotive applications. Starting from a detailed literature analysis and pushed by vehicle manufacturers’ needs, a simplified steering dynamic model, characterized by few parameters, has been identified. It guarantees both the replication of the dynamic behavior of real systems, generally represented through more complex multibody models, and the reduction of the simulation time of the entire vehicle system, making it suitable for dedicated numerical computing environments, such as the, so-called, explicit multibody codes. Moreover, particular emphasis has been place on the correct evaluation of the influence of friction on steering system dynamics.

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Ren, Fu Shen, Su Li Chen, and Zhi Gang Yao. "Dynamics Analysis and Vibration Suppression of a Flexible Rotation Beam." Applied Mechanics and Materials 214 (November 2012): 165–72. http://dx.doi.org/10.4028/www.scientific.net/amm.214.165.

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This paper studies the complex transverse vibration behavior of drill string. The drill string was simplified as flexible rotation beam, and drill string of complex load was simplified for flexible rotation beam system. The nonlinear dynamic equations of flexible rotation beam is established and the complex dynamic response of flexible rotation beam in resonance case is analyzed by using method of nonlinear dynamics method. Research result show that the chaotic responses are sensitive to the revolving speed, the nonlinear oscillation of drilling string can be controlled by changing the rotating speed. This study has guiding significance to keep sidewall stability in the process of horizontal wells of sidetrack, improve the drilling rate and reduce the cost of the drilling.

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Tur, Viktar, Andrei Tur, and Aliaksandr Lizahub. "Simplified analytical method for the robustness assessment of precast reinforced concrete structural systems." Budownictwo i Architektura 20, no. 4 (December 29, 2021): 093–114. http://dx.doi.org/10.35784/bud-arch.2774.

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The article presents the simplified implementation of alternative load path method based on the energy balance approach. This method should be used to check the global resistance of a damaged structural system after the occurrence of an accidental event. Basic assumptions of simplified analytical models for modelling resistance of horizontal ties in a damaged structural system, taking into account the membrane (chain) effects, were presented. An approach to modelling the dynamic resistance of a damaged structural system based on the energy balance method is described. Calculated dependencies for checking the robustness of a prefabricated multi-storey building with hollow-core slabs after the loss of the central column are proposed and considered using an example. On the considered example, a comparison of the required tie sections area with the dynamic resistance designed using the energy balance method (EBM) and according to the current standards, and a statistical assessment of the reliability of the load-bearing capacity models are carried out. In the end, a brief algorithm for the simplified calculation of the dynamic resistance of a damaged structural system is proposed.

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Singh, Surendra K., and Richard Huh. "Pressure relief sizing of reactive system using DIERS simplified methods and dynamic simulation method." Journal of Loss Prevention in the Process Industries 44 (November 2016): 718–25. http://dx.doi.org/10.1016/j.jlp.2016.08.017.

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Assi, Rola, and Ghyslaine McClure. "A simplified method for seismic analysis of rooftop telecommunication towers." Canadian Journal of Civil Engineering 34, no. 10 (October 1, 2007): 1352–63. http://dx.doi.org/10.1139/l07-061.

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A simplified method is presented in this paper for the estimation of forces at the base of telecommunication towers mounted on building rooftops due to seismic excitation. Although some codes and standards propose simplified methods for the evaluation of base shear forces for towers founded on ground, no method yet exists for the evaluation of overturning moments. The proposed simplified method is based on numerical simulations using truncated modal superposition, which is widely used for seismic analysis of linear structures. The method requires the prediction of input seismic acceleration at the building–tower interface, the definition of an acceleration profile along the building-mounted tower, and the determination or evaluation of the mass distribution of the tower along its height. The method was developed on the basis of detailed dynamic analyses of three existing towers assumed to be mounted separately on three buildings. It was found that the method yields conservative results, especially for the overturning moments.Key words: self-supporting towers, earthquake, horizontal excitation, dynamic analysis, acceleration, modal superposition.

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Chen, Long Wei, Shang Jiu Meng, Xiao Ming Yuan, and Rui Sun. "A Simplified Method for Evaluating Earthquake-Induced Differential Settlements of Buildings on Natural Subsoil." Advanced Materials Research 243-249 (May 2011): 2869–79. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2869.

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In terms of the physical mechanism and features of the dynamic soil-structure interaction during earthquake excitation, a simplified procedure for evaluating the earthquake-induced differential settlement of buildings on natural subsoil is presented. It takes into account of the irregularity of incident seismic waves and the different distribution of vertical dynamic stresses caused by seismic loading under the two sides of building base. Instead of FEM the simplified method based on the layer-wise summation method is used to calculate the settlement of the subsoil with building presence. The cone model proposed by Meek and Wolf is adopted to calculate the dynamic stress distribution under the building. The residual strain potential model of soil under irregular loading and the modulus-softening model are employed to calculate the permanent deformation of subsoil. The simplified method can consider the combined effect of soil, structure and seismic wave reasonably and describe the developing process of differential settlement. The results of large shaking table tests are consistent with the corresponding calculated results.

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Yang, Z. L., J. W. Zhang, and Y. Wang. "Dynamic Inhomogeneous Isoparametric Element with Coordinate Transformation." Journal of Mechanics 32, no. 3 (December 11, 2015): 289–96. http://dx.doi.org/10.1017/jmech.2015.99.

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AbstractBased on the coordinate transformation method, the formula of the dynamic inhomogeneous isoparametric finite element method is presented for generating element stiffness, damping and mass matrices. First, the global coordinate form and simplified form of dynamic inhomogeneous finite element are given in this paper. Then, the discrete material parameter distributions under the isoparametric coordinate system are obtained by using the transformation relationship between the global coordinates and the isoparametric coordinates. The simplified form with the discrete material parameter distributions is obtained for generating the element stiffness and mass matrices of the dynamic inhomogeneous isoparametric element. The numerical examples show that the scheme proposed in present paper has high precision.

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Weng, Ze Yu, Shao Heng Hu, Nan Nan Zhang, Hong Gang Ding, and Hong Wu You. "Dynamic Analysis of CNC Gantry Surface Grinder by Finite Element Method." Advanced Materials Research 102-104 (March 2010): 339–43. http://dx.doi.org/10.4028/www.scientific.net/amr.102-104.339.

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The dynamic characteristics of the grinding machines have an impact on its machining quality and cutting efficiency. In this paper, through the analysis of the structural features of the Large CNC gantry surface grinding machine, the finite element model of structure of the grinder was established on the base of the simplified machine structure, on which carried out its dynamics analysis, obtaining the modal parameters of the orders under different mode shapes. The effect on the dynamic characteristics of machine tools was analyzed under different mode shapes, then the weak link of the surface grinding machine was given, and then how to improve the structural design weakness of surface grinding machine was discussed, all of which provided theoretical basis for improvemental design for the structure of the large CNC gantry surface grinding machine.

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Zheng, Weijia, Ying Luo, YangQuan Chen, and Xiaohong Wang. "A Simplified Fractional Order PID Controller’s Optimal Tuning: A Case Study on a PMSM Speed Servo." Entropy 23, no. 2 (January 20, 2021): 130. http://dx.doi.org/10.3390/e23020130.

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A simplified fractional order PID (FOPID) controller is proposed by the suitable definition of the parameter relation with the optimized changeable coefficient. The number of the pending controller parameters is reduced, but all the proportional, integral, and derivative components are kept. The estimation model of the optimal relation coefficient between the controller parameters is established, according to which the optimal FOPID controller parameters can be calculated analytically. A case study is provided, focusing on the practical application of the simplified FOPID controller to a permanent magnet synchronous motor (PMSM) speed servo. The dynamic performance of the simplified FOPID control system is tested by motor speed control simulation and experiments. Comparisons are performed between the control systems using the proposed method and those using some other existing methods. According to the simulation and experimental results, the simplified FOPID control system achieves the optimal dynamic performance. Therefore, the validity of the proposed controller structure and tuning method is demonstrated.

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Thalfeldt, Martin, Anders Skare, Laurent Georges, and Øyvind Skreiberg. "A Simplified Power Sizing Method for the Correct Building Integration of Wood Stoves." E3S Web of Conferences 111 (2019): 02066. http://dx.doi.org/10.1051/e3sconf/201911102066.

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Wood stoves are widely used in dwellings for space heating, however transient heat output and relatively large heat emission might cause problems with over-heating in new well-insulated buildings. This paper introduces a simplified power sizing method for the building integration of wood stoves which was compared to dynamic building performance simulations. The analysis showed that on average the simplified method predicted the temperature increase in the living room similarly to dynamic simulations. However, in some cases the difference was up to 60%, which is significant when carried forward to selecting the optimal stove heat capacity. Precise use of the simplified power sizing method requires accurate knowledge of the building structures and effective thermal capacity of the room with the wood stove. Typically, this kind of knowledge is unavailable when selecting a wood stove and the method needs to be developed further. These investigations confirmed that more knowledge of the occupant behaviour and preference on thermal comfort is needed.

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Wang, Qing Fu, Hong Lin Zhao, Zhi Heng Wu, Guang Peng Zhang, Dong Hui Mu, Shi Guang Chen, and Wei Guo Zhou. "Research on the Information Extraction of the Whole Machine Simple Model and Characteristics Reproduction." Applied Mechanics and Materials 34-35 (October 2010): 1052–57. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1052.

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The static and dynamic characteristics calculating of the whole machine structure by finite element method lead to dense grid nodes, which is not conducive to rapid quantitative analysis. Therefore, a simplified model and the corresponding static and dynamic characteristics are needed. This paper presents a simplified model using key nodes kept principle and a corresponding software which reads data from resulting data file, extracts information such as coordinates, static and dynamic displacement of relevant nodes from reading data and draws simplified models of the whole machine structure and static and dynamic deformation of it. Take XK173 Vertical Milling Machine as the case research object, establish a complete machine model, analyze the static and dynamic characteristics and reproduce that using simplified model by software. The result shows that the Vertical Milling Machine nodes are reduced from the original 153 238 nodes to156 nodes. It well preserves machine structure and static and dynamic characteristics, and lays foundations for simplifying follow-up quantitative analysis.

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Qin, Guodong, Huapeng Wu, and Aihong Ji. "Equivalent Dynamic Analysis of a Cable-Driven Snake Arm Maintainer." Applied Sciences 12, no. 15 (July 26, 2022): 7494. http://dx.doi.org/10.3390/app12157494.

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In this paper, we investigate a design method for a cable-driven snake arm maintainer (SAM) and its dynamics modelling. A SAM can provide redundant degrees of freedom and high structural stiffness, as well as high load capacity and a simplified structure ideal for various narrow and extreme working environments, such as nuclear power plants. However, their serial-parallel configuration and cable drive system make the dynamics of a SAM strongly coupled, which is not conducive to accurate control. In this paper, we propose an equivalent dynamics modelling method for the strongly coupled dynamic characteristics of each joint cable. The cable traction dynamics are forcibly decoupled using force analysis and joint torque equivalent transformation. Then, the forcibly equivalent dynamic model is obtained based on traditional series robot dynamic modelling methods (Lagrangian method, etc.). To verify the correctness of the equivalent dynamics, a simple model-based controller is established. In addition, a SAM prototype is produced to collect joint angles and cable forces at different trajectories. Finally, the results of the equivalent dynamics control simulation and the prototype tests demonstrate the validity of the SAM structural design and the equivalent dynamics model.

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Alves, E. C., M. M. Sales, and P. M. F. Viana. "Data Extrapolation Method for The Dynamic Increasing Energy Test: SEM-CASE." Soils and Rocks 39, no. 2 (May 1, 2016): 177–87. http://dx.doi.org/10.28927/sr.392177.

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The dynamic increasing energy test has been widely used in pile load tests in Brazil in recent years. However, the ultimate strength of the single-foundation system is not mobilized in most of the tests because of various factors. In some cases, the equipment available cannot attain the necessary kinetic energy, or the structural element presents initial imperfections/ruptures. In this study, the authors present a method for extrapolating the mobilized static resistance vs. maximum displacement curve, which is obtained using the dynamic increasing energy test (DIET). Using the force and velocity signals collected by the PDA (Pile Driving Analyzer) system, it is possible to calculate the resistance and displacement by applying the Simplified CASE Method. An extrapolation method, the Simplified Extrapolation Method of the CASE Method (SEM-CASE), is presented based on the results of twenty-one precast concrete pile load tests that have been carried out in different soils. The estimated values of the ultimate complementary energy and ultimate strength were very close to the measured values in the presented load tests.

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Worley, M. D., and V. La Saponara. "A simplified dynamic model for front-end loader design." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 11 (November 1, 2008): 2231–49. http://dx.doi.org/10.1243/09544062jmes688.

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The front-end loader is an indispensable machine for the off-road construction equipment industry. It is a classic example of a working machine with complex interactions between its subsystems (hydraulic, mechanical, and electrical). Dynamic models of the full-scale vehicle coupled with event-based operator models are currently used to help quantify the overall system performance, efficiency, and operability. However, these models are complex and not always necessary to characterize the response of individual subsystems. There is great value added to the design process — especially in prototyping of new vehicle platforms — in development of simpler models that can quickly and accurately define first-order measures of system loads and performance. This paper presents a subscale dynamic model, which isolates the boom and bucket manipulator systems of the front-end loader for the purpose of design load characterization. The model includes state equations governing the hydraulic dynamics across the control valves and in the cylinders, as well as soil—tool interaction loads (passive earth loads) at the bucket cutting edge. The governing equations of motion for the multi-rigid body model of the bucket linkage are developed using Kane's method. The proposed model is intended to accelerate the structural design and analysis of the boom and bucket linkage subsystems and may yield useful information for optimization purposes. The output from the dynamic simulation is compared with the field test data of the machine.

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Li, Xing, Xiaofeng Wang, and Jianhui Wang. "A kind of Lagrange dynamic simplified modeling method for multi-DOF robot1." Journal of Intelligent & Fuzzy Systems 31, no. 4 (September 9, 2016): 2393–401. http://dx.doi.org/10.3233/jifs-169080.

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Dongxiao Ma, 马冬晓, 汪家春 Jiachun Wang, 陈宗胜 Zongsheng Chen, 王冰 Bing Wang, and 刘洋 Yang Liu. "Simplified Calibration Method for Radiation Temperature Measurement System with Wide Dynamic Range." Acta Optica Sinica 39, no. 6 (2019): 0612003. http://dx.doi.org/10.3788/aos201939.0612003.

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Dong, Sheng, Zhaohui Yuan, and Fuli Zhang. "A Simplified Method for Dynamic Equation of Robot in Generalized Coordinate System." Journal of Physics: Conference Series 1345 (November 2019): 042077. http://dx.doi.org/10.1088/1742-6596/1345/4/042077.

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Nogami, Toyoaki, and Harn Shearn Chen. "Boundary differential equation method: simplified dynamic soil stiffnesses for embedded rigid foundations." Soil Dynamics and Earthquake Engineering 22, no. 4 (June 2002): 323–34. http://dx.doi.org/10.1016/s0267-7261(02)00017-9.

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Lazzeri, L. "Simplified Nonlinear Ratchet Model for Dynamic Analysis of Pressure Components." Journal of Pressure Vessel Technology 114, no. 3 (August 1, 1992): 321–27. http://dx.doi.org/10.1115/1.2929047.

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A method for the analysis of components under the combined effect of pressure and externally applied dynamic generalized forces is described; comparison with tests is provided. It is concluded that neglecting the effect of ductility in the computation of the response leads to unrealistic results. A method of analysis is presented.

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Yang, Yu, Yan Wang, and Yun Fang Yang. "Vibration Analysis of Simply Supported Beams Traversed by Uniformly Distributed Two-Layer Spring-Mass System." Advanced Materials Research 919-921 (April 2014): 1164–68. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1164.

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Vertical vibration of identical simply supported bridges traversed by a train with uniformly distributed mass is investigated in this paper. The train with passengers onboard is simplified as a uniformly distributed two-layer spring-mass system as well as the bridges are simplified as consecutive simply supported Euler-Bernoulli beams. To analyze dynamic responses of the train and the bridges, the dynamic governing equation of the system is obtained and solved by a specific linear interpolating method and numerical integral methods. The result graphs indicate that dynamic responses of both beam and train carriage increase along with the mass ratio of bogie to car.

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Xu, Can, Wan Cheng Yuan, Kai Wei, and Pak Chiu Cheung. "Computation of Dynamic Characteristics of Deepwater Group Pile Foundation for Bridges." Advanced Materials Research 261-263 (May 2011): 1510–14. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.1510.

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In the design of deepwater foundation for bridges, the interaction between water and the structure especially under earthquake motions should be addressed. This paper presents a practical simplified method to analyze deepwater pile group foundation to determine its dynamic characteristics by combining approximate analytical solutions with the finite element method. The applicability of this proposed method is shown in a case study of a nine-pile foundation. Compared with those from complete numerical method, the analysis results from this simplified method are in agreement when the pile cap is not submerged in water. Furthermore when ignoring the vertical hydrodynamic added mass of the pile cap, the vertical vibration mode results are greatly affected, but not for other non-vertical vibration modes. This simplified method is also used in the study of the influence of water on the dynamic characteristics. The deeper the water is, the more obvious the impact of water is, particularly for the pile cap lateral bending modes, and there appears no evident difference for the pile lateral bending modes, on which water effect is stronger than that on pile cap lateral bending mode.

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Mukhamediev, Ravil I., Adilkhan Symagulov, Yan Kuchin, Kirill Yakunin, and Marina Yelis. "From Classical Machine Learning to Deep Neural Networks: A Simplified Scientometric Review." Applied Sciences 11, no. 12 (June 15, 2021): 5541. http://dx.doi.org/10.3390/app11125541.

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There are promising prospects on the way to widespread use of AI, as well as problems that need to be overcome to adapt AI&ML technologies in industries. The paper systematizes the AI sections and calculates the dynamics of changes in the number of scientific articles in machine learning sections according to Google Scholar. The method of data acquisition and calculation of dynamic indicators of changes in publication activity is described: growth rate (D1) and acceleration of growth (D2) of scientific publications. Analysis of publication activity, in particular, showed a high interest in modern transformer models, the development of datasets for some industries, and a sharp increase in interest in methods of explainable machine learning. Relatively small research domains are receiving increasing attention, as evidenced by the negative correlation between the number of articles and D1 and D2 scores. The results show that, despite the limitations of the method, it is possible to (1) identify fast-growing areas of research regardless of the number of articles, and (2) predict publication activity in the short term with satisfactory accuracy for practice (the average prediction error for the year ahead is 6%, with a standard deviation of 7%). This paper presents results for more than 400 search queries related to classified research areas and the application of machine learning models to industries. The proposed method evaluates the dynamics of growth and the decline of scientific domains associated with certain key terms. It does not require access to large bibliometric archives and allows to relatively quickly obtain quantitative estimates of dynamic indicators.

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Lv, Zhong Hui, Ke Li, Kai Ming Chen, and Jia Fan Zhang. "Grinding Load Identification of an Horomill Using Inverse Pseudo Excitation Method." Advanced Materials Research 496 (March 2012): 243–46. http://dx.doi.org/10.4028/www.scientific.net/amr.496.243.

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A rigid-flexible coupling dynamic model is established for the grinding roller system of an Horomill. Two coordinates are chosen to describe the grinding roller motion, namely the linear displacement of the roller at the center of mass and its rotation around the centroid on the applied plane of the grinding forces. The grinding forces applied on the roller are simplified to be a force and a torque, acting respectively on the direction of two coordinates. The frequency response function (FRF) matrices, with the two grinding force components as input and the vibration acceleration responses of two measuring points on the roller as output, are obtained respectively by using multibody dynamics computational software. The auto-PSD and cross-PSD of the vibration response on two measuring points are known. An inverse pseudo excitation method (IPEM) is then used for solving the grinding dynamic load spectrum. The obtained load spectrum would be helpful for the Horomill dynamic design and the fatigue calculation.

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Wei, Zhan, Guo Guang Jin, Bo Yan Chang, and Dong Liang. "Dynamic Design of High-Speed Planar Cam with Oscillating Follower." Advanced Materials Research 308-310 (August 2011): 1845–49. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1845.

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The purpose of this paper is to design a smooth and higher-degree polynomial curve for satisfying the need of dynamic features of high-speed cam. In this paper, the dynamic model of cam mechanism is simplified into a single-free-of-degree dynamic model. The dynamic equation in this model can be used to establish the design equation of the cam profile. Finally, a typical cam mechanism is used as a simulating example to validate this dynamic modeling method and the curve obtained from calculation is smooth and can satisfy the requirement of dynamics characteristics.

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Naji, Arash, and Fereidoon Irani. "Simplified Procedure for Progressive Collapse Analysis of Steel Structures." Advanced Materials Research 255-260 (May 2011): 482–86. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.482.

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Progressive collapse refers to a phenomenon in which a local damage of a primary structural element leads to the failure of partial or whole structural system. To investigate the progressive collapse of structures, nonlinear dynamic procedure leads to more accurate results than static procedures. Nonlinear dynamic procedure is very complicated and the evaluation or validation of its results may be very time-consuming. Therefore using simplified methods are very important. This paper presents a simplified and accurate analysis procedure for progressive collapse analysis of steel structures. The proposed method results show to have good agreement with nonlinear dynamic analysis results. Also, the capacity curve obtained from dividing the accumulated area under the nonlinear static load-displacement curve by the corresponding displacement of the column-removed point is used to predict the progressive collapse resistance of the column-removed structure.

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Liu, Li Fang, Xiao Xia Niu, Wang Yu, and Xiao Man Liu. "Model and Analysis of Dynamic Characteristic on Cable-Stayed Bridge with FEM." Advanced Materials Research 368-373 (October 2011): 1069–72. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1069.

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Using the finite element method to establish refined finite element model and the simplified mode of cross line cable-stayed bridge "yan Hong qiao" of the yanshan university. And using ANSYS structure analysis procedures to analysis the vibration characteristic, the first10 order natural frequency and the correspo- nding vibration mode were given. Then, compared and analysis the refined model and the simplified model, the establishment of finite element model in general engineering analysis, correction method and validation suggestions.

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Ren, Qing, and Mao Song Huang. "Analysis for Axial Vibration and Internal Forces of Totally and Partially Embedded Pile Groups with Flexible Caps." Advanced Materials Research 163-167 (December 2010): 3860–67. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3860.

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In this paper, a simplified analytical method is developed for the axial harmonic response of totally and partially embedded pile groups in homogeneous and layered soil deposits. Based on BDWF model, finite element sub-structure method is used to setup the dynamic model of cap-pile groups which can precisely simulate kinetic interaction and inertial interaction. A comprehensive parameter study focuses on the influence of caps’ elastic modulus and mass density on pile groups’ dynamic response, and then points out the limition of rigid cap in practical design. An approximate solution is finally presented for the internal forces distributed on pile heads due to pile-to-pile interaction. The solution of above approach was compared with that of traditional simplified model (rigid and massless cap solution) in simulating an in-site experiment and dynamics response of partially embedded pile groups for offshore wind farm.

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Deng, Hao-Yun, Xin-Yang Jin, and Ming Gu. "A Simplified Method for Evaluating the Dynamic Properties of Structures Considering Soil–Pile–Structure Interaction." International Journal of Structural Stability and Dynamics 18, no. 06 (June 2018): 1871005. http://dx.doi.org/10.1142/s0219455418710050.

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A simplified method is presented for evaluating the dynamic properties of structures considering the effects of soil–pile–structure interaction (SPSI). A substructure method is used to establish the model of the soil–pile–structure system which is characterized by several dimensionless parameters. The shear-type structure is modeled as a generalized single-degree-of-freedom system using the virtual displacement principle, and the impedance functions of the floating pile-foundation are formulated by the thin-layer method. A number of coupled systems are analyzed and the results are used as the statistical base to obtain the mathematical relations between the dimensionless parameters and the dynamic properties. The dynamic properties solved by the equations are compared with those of the field experiment, shaking-table test and other analytical methods. The results indicated that the proposed equations are of high accuracy and can be used to obtain the dynamic properties of piles directly without performing complex analysis.

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Khedr, Mohamed A., and Ghyslaine McClure. "A simplified method for seismic analysis of lattice telecommunication towers." Canadian Journal of Civil Engineering 27, no. 3 (June 1, 2000): 533–42. http://dx.doi.org/10.1139/l99-090.

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A simplified static method for estimating the member forces in self-supporting lattice telecommunication towers due to both horizontal and vertical earthquake excitations is presented in this paper. The method is based on the modal superposition technique and the response spectrum approach, which are widely used for seismic analysis of linear structures. It is assumed that the lowest three flexural modes of vibration are sufficient to correctly estimate the tower's response to horizontal excitation, while only the lowest axial mode is sufficient to capture the response to vertical excitation. An acceleration profile along the height of the tower is defined using estimates of the lowest three flexural modes or the lowest axial mode, as appropriate, together with the spectral acceleration values corresponding to the associated natural periods. After the mass of the tower is calculated and lumped at the leg joints, a set of equivalent static lateral or vertical loads can be determined by simply multiplying the mass profile by the acceleration profile. The tower is then analyzed statically under the effect of these loads to evaluate the member forces. This procedure was developed on the basis of detailed dynamic analysis of ten existing three-legged self-supporting telecommunication towers with height range of 30-120 m. The maximum differences in member forces obtained with the proposed method and the detailed seismic analysis are of the order of ±25% in the extreme cases, with an average difference of ±7%. The results obtained for two towers with heights of 66 and 83 m are presented in this paper to demonstrate the accuracy and practicality of the proposed method.Key words: self-supporting tower, earthquake, vertical excitation, dynamic analysis.

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Journal articles on the topic 'Simplified dynamic method'

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