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Artículos de revistas sobre el tema "Dynamic design of experiments"

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Publicado: 1 de junio de 2024

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1

Mccaskey, S. D., and K. L. Tsui. "Analysis of dynamic robust design experiments." International Journal of Production Research 35, no. 6 (1997): 1561–74. http://dx.doi.org/10.1080/002075497195128.

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2

Schillinger, Mark. "Safe and dynamic design of experiments." at - Automatisierungstechnik 68, no. 5 (2020): 387–88. http://dx.doi.org/10.1515/auto-2020-0011.

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AbstractThis PhD thesis covers multiple approaches for dynamic design of experiments considering safety constraints. Special emphasis is put on the evaluation of these methods at real-world systems in the combustion engine domain.
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3

Espie, D., and S. Macchietto. "The optimal design of dynamic experiments." AIChE Journal 35, no. 2 (1989): 223–29. http://dx.doi.org/10.1002/aic.690350206.

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4

Phadke, Abhishek, F. Antonio Medrano, Chandra N. Sekharan, and Tianxing Chu. "Designing UAV Swarm Experiments: A Simulator Selection and Experiment Design Process." Sensors 23, no. 17 (2023): 7359. http://dx.doi.org/10.3390/s23177359.

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The rapid advancement and increasing number of applications of Unmanned Aerial Vehicle (UAV) swarm systems have garnered significant attention in recent years. These systems offer a multitude of uses and demonstrate great potential in diverse fields, ranging from surveillance and reconnaissance to search and rescue operations. However, the deployment of UAV swarms in dynamic environments necessitates the development of robust experimental designs to ensure their reliability and effectiveness. This study describes the crucial requirement for comprehensive experimental design of UAV swarm systems before their deployment in real-world scenarios. To achieve this, we begin with a concise review of existing simulation platforms, assessing their suitability for various specific needs. Through this evaluation, we identify the most appropriate tools to facilitate one’s research objectives. Subsequently, we present an experimental design process tailored for validating the resilience and performance of UAV swarm systems for accomplishing the desired objectives. Furthermore, we explore strategies to simulate various scenarios and challenges that the swarm may encounter in dynamic environments, ensuring comprehensive testing and analysis. Complex multimodal experiments may require system designs that may not be completely satisfied by a single simulation platform; thus, interoperability between simulation platforms is also examined. Overall, this paper serves as a comprehensive guide for designing swarm experiments, enabling the advancement and optimization of UAV swarm systems through validation in simulated controlled environments.
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5

Deflorian, Michael, and Susanne Zaglauer. "Design of Experiments for nonlinear dynamic system identification." IFAC Proceedings Volumes 44, no. 1 (2011): 13179–84. http://dx.doi.org/10.3182/20110828-6-it-1002.01502.

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6

TSUI, KWOK-LEUNG. "Modeling and analysis of dynamic robust design experiments." IIE Transactions 31, no. 12 (1999): 1113–22. http://dx.doi.org/10.1080/07408179908969912.

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7

Domagalski, Nathan R., Brendan C. Mack, and José E. Tabora. "Analysis of Design of Experiments with Dynamic Responses." Organic Process Research & Development 19, no. 11 (2015): 1667–82. http://dx.doi.org/10.1021/acs.oprd.5b00143.

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8

Zhang, Yang, Zhaobo Chen, and Yinghou Jiao. "A hybrid vibration isolator: Design, control, and experiments." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 17 (2016): 2982–95. http://dx.doi.org/10.1177/0954406215604335.

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A hybrid vibration isolator (HVI) is presented with its structure, dynamic model, control strategy and preliminary experiments. The HVI is composed of the active piezostack actuator and the passive rubber isolator, which has compact structure and high reliability. Based on the dynamic model and the formula derivation of the transmissibility, the control algorithm is established using the linear quadratic regulator method. The simulations indicate that the vibrations acting on the load platform are vastly reduced, where the active piezostack-based actuator can eliminate the resonance peak significantly. Moreover, the passive rubber-based isolator is effective to isolate a part of vibration once active control fails. Finally, an experimental system is built up to implement integrated passive and active vibration control using the HVI prototype. The experimental results verify the theoretical analysis work.
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9

Lybbert, Travis J., Francisco B. Galarza, John McPeak, et al. "Dynamic Field Experiments in Development Economics: Risk Valuation in Morocco, Kenya, and Peru." Agricultural and Resource Economics Review 39, no. 2 (2010): 176–92. http://dx.doi.org/10.1017/s1068280500007231.

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The effective design and implementation of interventions that reduce vulnerability and poverty require a solid understanding of underlying poverty dynamics and associated behavioral responses. Stochastic and dynamic benefit streams can make it difficult for the poor to learn the value of such interventions to them. We explore how dynamic field experiments can help (i) intended beneficiaries to learn and understand these complicated benefit streams, and (ii) researchers to better understand how the poor respond to risk when faced with nonlinear welfare dynamics. We discuss and analyze dynamic risk valuation experiments in Morocco, Peru, and Kenya.
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10

BÄTZ, GEORG, MICHAEL SCHEINT, and DIRK WOLLHERR. "TOWARD DYNAMIC MANIPULATION FOR HUMANOID ROBOTS: EXPERIMENTS AND DESIGN ASPECTS." International Journal of Humanoid Robotics 08, no. 03 (2011): 513–32. http://dx.doi.org/10.1142/s0219843611002599.

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This paper discusses a control architecture to equip humanoid robots with dynamic manipulation skills. Such skills are beneficial, as they increase the dexterity of humanoid robots and improve their handling of unforeseen situations. The nature of manipulation poses challenges with respect to environment perception, action planning, and motion control. These challenges are addressed in the paper: a dynamic force/torque (F/T) observer is discussed to reconstruct the environment F/Ts and to improve the interaction control. A method for online motion planning is investigated, which generates trajectories based on different selection criteria. These elements are integrated in a control design for dynamic manipulation and experimentally validated for two tasks: two-handed ball throwing and one-handed ball catching. Based on the experimental results, a modified end effector design with intrinsic compliance is proposed to improve the system performance that is demonstrated in case studies.
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11

Faramee, Veeravat, and Viboon Sangveraphunsiri. "Experiment of the State Variable Feedback for a Quadrotor." Applied Mechanics and Materials 619 (August 2014): 267–72. http://dx.doi.org/10.4028/www.scientific.net/amm.619.267.

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This work is the design of the robust attitude stabilization of a quadrotor. The dynamics model of the quadrotor is normally non-linear and it is difficult to obtain an accurate dynamic model. The linearized model is obtained based on data from experiments. The Multiple Input Multiple Output (MIMO) state variable feedback control is implemented to stabilize the system. The dynamic model based on approximated torques (roll, pitch, and yaw) as inputs and the dynamic model based on rotational speeds of the four rotors are used for design the controller. The experimental results from both dynamic model has very similar characteristic and perform much better than the conventional controller.
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12

Smith, Anne C., Mark R. Stefani, Bita Moghaddam, and Emery N. Brown. "Analysis and Design of Behavioral Experiments to Characterize Population Learning." Journal of Neurophysiology 93, no. 3 (2005): 1776–92. http://dx.doi.org/10.1152/jn.00765.2004.

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In population learning studies, between-subject response differences are an important source of variance that must be characterized to identify accurately the features of the learning process common to the population. Although learning is a dynamic process, current population analyses do not use dynamic estimation methods, do not compute both population and individual learning curves, and use learning criteria that are less than optimal. We develop a state-space random effects (SSRE) model to estimate population and individual learning curves, ideal observer curves, and learning trials, and to make dynamic assessments of learning between two populations and within the same population that avoid multiple hypothesis tests. In an 80-trial study of an NMDA antagonist's effect on the ability of rats to execute a set-shift task, our dynamic assessments of learning demonstrated that both the treatment and control groups learned, yet, by trial 35, the treatment group learning was significantly impaired relative to control. We used our SSRE model in a theoretical study to evaluate the design efficiency of learning experiments in terms of the number of animals per group and number of trials per animal required to characterize learning differences between two populations. Our results demonstrated that a maximum difference in the probability of a correct response between the treatment and control group learning curves of 0.07 (0.20) would require 15 to 20 (5 to 7) animals per group in an 80 (60)-trial experiment. The SSRE model offers a practical approach to dynamic analysis of population learning and a theoretical framework for optimal design of learning experiments.
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13

Domagalski, Nathan R., Brendan C. Mack, and José E. Tabora. "Correction to “Analysis of Design of Experiments with Dynamic Responses”." Organic Process Research & Development 22, no. 11 (2018): 1578. http://dx.doi.org/10.1021/acs.oprd.8b00328.

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14

MOSKOWITZ, HERBERT, and ROBERT D. PLANTE. "DYNAMIC GRAPHICAL ASSESSMENT OF INTERACTION EFFECTS IN DESIGN OF EXPERIMENTS." Production and Operations Management 6, no. 4 (2009): 357–72. http://dx.doi.org/10.1111/j.1937-5956.1997.tb00480.x.

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15

Hashimoto, Koichi, and Toshiro Noritsugu. "Design of a Robotic System that Plays with a Yoyo." Journal of Robotics and Mechatronics 11, no. 5 (1999): 387–92. http://dx.doi.org/10.20965/jrm.1999.p0387.

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Yoyo dynamics are discontinuous and highly nonlinear, and dynamic parameters are difficult to estimate precisely. Some parameters even change their sign at the loop bottom of yoyo's trajectory. Humans predict parameter change timing visually and sense yoyo dynamics through the fingers. Designing a robot that plays with a yoyo is difficult due to a lack of sensors and dynamic equations for sensing yoyo movement. We propose eventbased formulation for this based on an energy balance model and event-driven control. Simulations and experiments verified the validity of formulation and controller design.
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16

Asprey, S. P., S. Macchietto, and C. C. Pantelides. "Robust Optimal Designs for Dynamic Experiments." IFAC Proceedings Volumes 33, no. 10 (2000): 845–50. http://dx.doi.org/10.1016/s1474-6670(17)38645-7.

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17

Gagnol, Vincent, Belhassen C. Bouzgarrou, Pascal Ray, and Christian Barra. "Stability-Based Spindle Design Optimization." Journal of Manufacturing Science and Engineering 129, no. 2 (2006): 407–15. http://dx.doi.org/10.1115/1.2673400.

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Prediction of stable cutting regions is a critical requirement for high-speed milling operations. These predictions are generally made using frequency-response measurements of the tool-holder-spindle set obtained from a nonrotating spindle. However, significant changes in system dynamics occur during high-speed rotation. In this paper, a dynamic high-speed spindle-bearing system model is elaborated on the basis of rotor dynamics prediction and readjusted on the basis of experimental modal identification. The dependency of dynamic behavior on speed range is then investigated and determined with accuracy. Dedicated experiments are carried out in order to confirm model results. They show that dynamic effects due to high rotational speed and elastic deformations, such as gyroscopic coupling and spin softening, have a significant influence on spindle behavior. By integrating the modeled speed-dependent spindle transfer function in the chatter vibration stability approach of Altintas and Budak (1995, CIRPS Ann, 44(1), pp. 357–362), a new dynamic stability lobe diagram is predicted. Significant changes are observed in the stability limits constructed using the proposed approach and allow accurate prediction of cutting conditions to be established. Finally, optimization studies are performed on spindle design parameters in order to obtain a chatter vibration-free cutting operation at the desired speed and depth of cut for a given cutter.
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18

Wang, Han, Chun Jie Wang, Xiao Li, and Qiu Hong Lin. "Large SAR Antenna Deployable Structure Design and Optimization." Applied Mechanics and Materials 163 (April 2012): 62–65. http://dx.doi.org/10.4028/www.scientific.net/amm.163.62.

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Remote sensing satellites equipped with large synthetic aperture radar (SAR) can image the earth in all weather and lighting conditions. For high packaging efficiency in launch and precise configuration on orbit, deployable mechanisms are designed to deploy the large SAR antenna panels. For the two-panel antenna, a six-bar-linkage deployable driving mechanism is designed. According to the design, a parameterized dynamic model is built in ADAMS software with secondary development technology to obtain its dynamics characteristics through simulation analysis. To improve the dynamic characteristics and the precision of deployment design of experiments and optimizations were carried through in this paper.
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19

Wang, Chen, Jinbao Chen, Xingliang Li, Heng Chen, Hong Nie, and Fei Lin. "Design, dynamic analysis, and experiments of MRF dampers for lunar landers." Advances in Space Research 68, no. 7 (2021): 3012–25. http://dx.doi.org/10.1016/j.asr.2021.05.029.

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20

Fiordalis, Andrew, and Christos Georgakis. "Optimizing Batch Crystallization Cooling Profiles: The Design of Dynamic Experiments Approach." IFAC Proceedings Volumes 43, no. 5 (2010): 31–36. http://dx.doi.org/10.3182/20100705-3-be-2011.00006.

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21

Shipley, G. A., C. A. Jennings, and P. F. Schmit. "Design of dynamic screw pinch experiments for magnetized liner inertial fusion." Physics of Plasmas 26, no. 10 (2019): 102702. http://dx.doi.org/10.1063/1.5120529.

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22

Martínez, Ernesto C., Mariano D. Cristaldi, and Ricardo J. Grau. "Design of Dynamic Experiments in Modeling for Optimization of Batch Processes." Industrial & Engineering Chemistry Research 48, no. 7 (2009): 3453–65. http://dx.doi.org/10.1021/ie8000953.

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23

Chang, Hsu-Hwa, and Yan-Kwang Chen. "Neuro-genetic approach to optimize parameter design of dynamic multiresponse experiments." Applied Soft Computing 11, no. 1 (2011): 436–42. http://dx.doi.org/10.1016/j.asoc.2009.12.002.

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24

He, Zhen, Panpan Zhou, Min Zhang, and Thong Ngee Goh. "A Review of Analysis of Dynamic Response in Design of Experiments." Quality and Reliability Engineering International 31, no. 4 (2014): 535–42. http://dx.doi.org/10.1002/qre.1627.

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25

Cheng, Yung Chang, Deng Huei Lin, Cho-Pei Jiang, and Cheng Kang Lee. "Application of Uniform Design and Kriging Interpolation in Optimization of ITI Dental Implant with Dynamic Chewing Loads." Applied Mechanics and Materials 575 (June 2014): 512–15. http://dx.doi.org/10.4028/www.scientific.net/amm.575.512.

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The aim of this paper is to present an integrated procedure for the optimization of dimensions of the ITI dental implant with dynamic chewing loads. The procedure is composed of uniform design of experiments, explicit dynamics finite element analysis, Kriging interpolation, and Nelder-Mead simplex local search optimization method. Firstly, uniform design method is employed to create a set of experiments. Then, explicit dynamics finite element analysis software ANSYS/LS-DYNA is used to analyze the micromotion of cortical and cancellous bones while the dynamic chewing loads acts on the implant. Next, Kriging interpolation is applied to construct the surrogate model of micromotion based on the input and output data of experiments. Finally, Nelder-Mead simplex local search method is applied to find the optimal solution of dimensions of dental implant under the goal of minimizing the micromotion. After performing the optimization procedure presented in this paper, the micromotion of the ITI dental implant system model can successfully be reduced by a rate of 29.7 %.
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26

Zhao, Fang, Mu Yi Lin, and Zhun Wang. "On Hydraulic Brake System Using Bench Experiments for Off-Road Vehicles." Advanced Materials Research 588-589 (November 2012): 327–30. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.327.

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The full power hydraulic brake system has several advantages over traditional brake actuation systems. These systems are capable of supplying fluid to a range of very small and large volume service brakes with actuation that is faster than air/hydraulic brake systems. Implementation of full power hydraulic brake system in off-road vehicles calls for good understanding of its dynamic characteristics. In this paper, we consider the problem of dynamic modeling of the brake system and develop a dynamic model for a hydraulic brake valve. First, the dynamic characteristics of full power hydraulic brake system are analyzed theoretically. The effects of varying design parameters (brake valve, accumulator and so on) and the different operating conditions are then analyzed. Second, we investigate the dynamic characteristics of a full power hydraulic brake system using a test bench, which is a loader brake system specifically designed for one construction Machinery Company. Finally, based on the experimental results, the mathematical models are amended and verified. The result shows that the model-calculated data agree well with tested data. The dynamic behavior of hydraulic valve can be well predicted with the model. The simplified models can be applied to the studies of full power hydraulic brake system dynamics.
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27

Mehedi, Ibrahim M., Uzair Ansari, and Ubaid M. AL-Saggaf. "Three degrees of freedom rotary double inverted pendulum stabilization by using robust generalized dynamic inversion control: Design and experiments." Journal of Vibration and Control 26, no. 23-24 (2020): 2174–84. http://dx.doi.org/10.1177/1077546320915333.

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The aim of this article was to determine control strategy for balance control of rotary double inverted pendulum system, which is highly nonlinear and unstable under-actuated system. The complexities involved in rotary double inverted pendulum dynamics make this system a useful engineering test bed to test and verify newly designed controllers. In this article, a constraint-based control approach titled robust generalized dynamic inversion is designed and implemented for robust stabilization of rotary double inverted pendulum system. The robust generalized dynamic inversion control is designed in two stages; in the first stage, constraint differential equations of the controlled state variables are prescribed, which encompasses the control objectives. To enforce the constraint dynamics, the equivalent control is realized by means of Moore–Penrose generalized inversion. To enhance robustness, the switching (discontinuous) control is introduced in second stage, whose design principle is based on classical sliding mode control theory. Finally, the controllers obtained in two stages are augmented to form the resultant robust generalized dynamic inversion control law. The proposed controller ensures robustness along with improved time domain performance regardless of system nonlinearities, uncertainties, and unwanted disturbances. The stability analysis is presented for guaranteeing semi-global asymptotically stable closed loop performance via Lyapunov stability criteria. Numerical simulation and experimental investigations are carried out along with comparative analysis, to demonstrate the effectiveness of robust generalized dynamic inversion control algorithm over other conventional control methods.
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28

SEECHARAN, TURUNA S., and GORDON J. SAVAGE. "PROBABILITY-BASED DESIGN OPTIMIZATION OF DYNAMIC SYSTEMS." International Journal of Reliability, Quality and Safety Engineering 19, no. 01 (2012): 1250001. http://dx.doi.org/10.1142/s0218539312500015.

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The mechanistic model of a dynamic system is often so complex that it is not conducive to probability-based design optimization. This is so because the common method to evaluate probability is the Monte Carlo method which requires thousands of lifetime simulations to provide probability distributions. This paper presents a methodology that (1) replaces the implicit mechanistic model with a simple explicit model, and (2), transforms the dynamic, probabilistic, problem into a time invariant probability problem. Probabilities may be evaluated by any convenient method, although the first-order reliability method is particularly attractive because of its speed and accuracy. A part of the methodology invokes design of computer experiments and approximating functions. Training sets of the design variables are selected, a few computer experiments are run to produce a matrix of corresponding responses at discrete times, and then the matrix is replaced with a vector of so-called metamodels. Responses at an arbitrary design set and at any time are easily calculated and then used to formulate common, time-invariant, performance measures. Design variables are treated as random variables and limit-state functions are formed in standard normal probability space. Probability-based design is now straightforward and optimization determines the best set of distribution parameters. Systems reliability methods may be invoked for multiple competing performance measures. Further, singular value decomposition may be used to reduce greatly the number of metamodels needed by transforming the response matrix into two smaller matrices: One containing the design variable-specific information and the other the time-specific information. An error analysis is presented. A case study of a servo-control mechanism shows the new methodology provides controllable accuracy and a substantial time reduction when compared to the traditional mechanistic model with Monte Carlo sampling.
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29

Клубничкин, Владислав, Vladislav Klubnichkin, Евгений Клубничкин, et al. "Program and methodology for carrying out experimental studies of a loading and transport machine in an application package." Forestry Engineering Journal 7, no. 4 (2018): 175–82. http://dx.doi.org/10.12737/article_5a3cf5129450f7.98447330.

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The article presents the program and methodology for conducting experimental studies of the dynamics of the tracked movement of loading and transport machines in the applied program package "Universal mechanism" using module "tracked vehicles". Presents the objectives of the auxiliary and the main dynamic experiments. Auxiliary experiments serve the purpose of calculation of determining the initial state of tracked loading and transport machines and training perform basic experiments. The main experiments designed to study the dynamic properties of the tracked loading-transport machines. The list of dynamic experiments including experiments on: equilibrium; the tension of the caterpillars; the calculation of initial velocities; the vertical pumping; the linear progression; the control without feedback; tests with the operator (driver). The article describes the steps which are needed to prepare a simulation model of the crawler handling machine before performing dynamic experiments. Examples are given of the parameters of the irregularities and white-the path on which will move the simulation model tracked the loading and transport machines during the experiments. Presents fragments model the motion of a tracked loading-transport machines. The proposed program and methodology for conducting experimental research, tracked loading and transport machines in the applied software package that allows the design stage to quickly conduct a number of virtual dynamic experiments with the aim of finding operating points, accelerations and loads in the various elements of the machine (primarily in the elements of cater-pillar tracks). This will make it possible in the course of virtual experiments to find the optimal parameters of construction elements tracked loading and transport machines at the design stage that will allow the prototype cars with the least modifications to work in the given natural-production conditions.
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30

Fiordalis, Andrew, and Christos Georgakis. "Design of Dynamic Experiments Versus Model-Based Optimization of Batch Crystallization Processes." IFAC Proceedings Volumes 44, no. 1 (2011): 14019–24. http://dx.doi.org/10.3182/20110828-6-it-1002.01251.

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31

Chen, Bing H., Sean Bermingham, Andreas H. Neumann, Herman J. M. Kramer, and Steven P. Asprey. "On the Design of Optimally Informative Experiments for Dynamic Crystallization Process Modeling." Industrial & Engineering Chemistry Research 43, no. 16 (2004): 4889–902. http://dx.doi.org/10.1021/ie030649n.

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32

Wang, Haibo, Junsi Chen, Zhanxia Feng, et al. "Development of a Mobile Buoy with Controllable Wings: Design, Dynamics Analysis and Experiments." Journal of Marine Science and Engineering 12, no. 1 (2024): 150. http://dx.doi.org/10.3390/jmse12010150.

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Marine monitoring equipment such as Argo profiling buoys and underwater gliders are important devices for oceanographic research and marine resource exploration. In this study, a novel mobile buoy capable of vertical profiling motion like Argo profiling buoys and sawtooth gliding motion like underwater gliders is proposed. The proposed mobile buoy can switch between the two motion modes with controllable wings. To verify the feasibility of the proposed mobile buoy, a fluid–multibody coupling model considering multibody dynamics and hydrodynamics was developed to investigate the dynamic response. A scaled-down buoy prototype was fabricated and the feasibility of the two motion modes was experimentally investigated in a laboratory tank. The experimental results agree well with the results of numerical simulation. This work can be helpful for the design and analysis of this kind of mobile buoy.
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33

Shi, Ao, Bo Lu, Dangguo Yang, Xiansheng Wang, Junqiang Wu, and Fangqi Zhou. "Study on model design and dynamic similitude relations of vibro-acoustic experiment for elastic cavity." Modern Physics Letters B 32, no. 12n13 (2018): 1840047. http://dx.doi.org/10.1142/s021798491840047x.

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Coupling between aero-acoustic noise and structural vibration under high-speed open cavity flow-induced oscillation may bring about severe random vibration of the structure, and even cause structure to fatigue destruction, which threatens the flight safety. Carrying out the research on vibro-acoustic experiments of scaled down model is an effective means to clarify the effects of high-intensity noise of cavity on structural vibration. Therefore, in allusion to the vibro-acoustic experiments of cavity in wind tunnel, taking typical elastic cavity as the research object, dimensional analysis and finite element method were adopted to establish the similitude relations of structural inherent characteristics and dynamics for distorted model, and verifying the proposed similitude relations by means of experiments and numerical simulation. Research shows that, according to the analysis of scale-down model, the established similitude relations can accurately simulate the structural dynamic characteristics of actual model, which provides theoretic guidance for structural design and vibro-acoustic experiments of scaled down elastic cavity model.
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34

Kraleva, Radoslava Stankova, Velin Spasov Kralev, Nina Sinyagina, Petia Koprinkova-Hristova, and Nadejda Bocheva. "Design and Analysis of a Relational Database for Behavioral Experiments Data Processing." International Journal of Online Engineering (iJOE) 14, no. 02 (2018): 117. http://dx.doi.org/10.3991/ijoe.v14i02.7988.

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In this paper, the results of a comparative analysis between different approaches to experimental data storage and processing are presented. Several studies related to the problem and some methods for solving it have been discussed. Different types of databases, ways of using them and the areas of their application are analyzed. For the purposes of the study, a relational database for storing and analyzing a specific data from behavioral experiments was designed. The methodology and conditions for conducting the experiments are described. Three different indicators were analyzed, respectively: memory required to store the data, time to load the data from an external file into computer memory and iteration time across all records through one cycle. The obtained results show that for storing a large number of records (in the order of tens of millions of rows), either dynamic arrays (stored on external media in binary file format), or an approach based on a local or remote database management system can be used. Regarding the data loading time, the fastest approach was the one that uses dynamic arrays. It outperforms significantly the approaches based on a local or remote database. The obtained results show that the dynamic arrays and the local data sets approaches iterated much faster across all data records than the remote database approach. The paper concludes with proposal for further developments towards using of web services.
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35

Kanamori, Mitsuru, and Masayoshi Tomizuka. "Dynamic Anti-Integrator-Windup Controller Design for Linear Systems With Actuator Saturation." Journal of Dynamic Systems, Measurement, and Control 129, no. 1 (2006): 1–12. http://dx.doi.org/10.1115/1.2397146.

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The present paper is concerned with the design of dynamic anti-integrator-windup controllers for critically stable linear systems with a single pole at the origin. The constant gain term in the conventional anti-windup controller is extended to have dynamics represented by a transfer function. The proposed dynamic anti-windup compensator is similar to the one based on co-prime factorization of the plant. The overall controller includes an internal model for constant signals and achieves regulation for constant disturbance and reference inputs as long as the asymptotic control input stays within the saturation limits. The effectiveness of the proposed method is demonstrated on a one-link flexible arm through simulations and experiments.
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36

Tsuruta, K., and K. Kojima. "Dynamic Design Procedure for HVAC Ducts." Journal of Pressure Vessel Technology 110, no. 4 (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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37

Yin, Jianjun, Zhijian Chen, Chao Liu, Maile Zhou, and Lu Liu. "Design and Experiments of a Real-Time Bale Density Monitoring System Based on Dynamic Weighing." Sensors 23, no. 4 (2023): 1778. http://dx.doi.org/10.3390/s23041778.

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Bale density is one of the main performance indicators to measure the quality of baler operation. In this study, a real-time baler bale density monitoring system was designed for the problem of difficult real-time measurement of bale density on round balers. Firstly, a weighing calculation model for the rolling and sliding stage of the bale was established, and the dynamic characteristics during the contact between the bale and the inclined surface were analyzed based on ADAMS dynamics simulation. Then, a real-time monitoring system for the bale density based on the contact pressure of the inclined surface, attitude angle measurement and hydraulic monitoring of the cylinder was constructed, and the accuracy of the weighing model was confirmed. The system was used to observe and analyze the changes in the pitch angle of the carrier table and the oil pressure in the rod chamber of the backpack cylinder during the operation of the round baler. Finally, the monitoring system was calibrated and the dynamic calibration equations were obtained. The results show that the maximum error between the calculated value of the original weighing model and the actual weight was 3.63%, the maximum error of the calculated value of the weighing model corrected by the calibration equations was 3.40% and the measurement accuracy could be satisfied. The results show that the system was highly accurate and met the practical needs of bale weighing in the field.
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38

Ma, Jiawang, Guanlin Qiu, Weichen Guo, Peitong Li, and Gan Ma. "Design, Analysis and Experiments of Hexapod Robot with Six-Link Legs for High Dynamic Locomotion." Micromachines 13, no. 9 (2022): 1404. http://dx.doi.org/10.3390/mi13091404.

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An important feature of a legged robot is its dynamic motion performance. Traditional methods often improve the dynamic motion performance by reducing the moment of inertia of robot legs or by adopting quasi-direct drive actuators. This paper proposes a method to enhance the dynamic performance of a legged robot by transmission mechanism. Specifically, we present a unique six-link leg mechanism that can implement a large output motion using a small drive motion. This unique feature can enhance the robots’ dynamic motion capability. Experiments with a hexapod robot verified the effectiveness of the mechanism. The experimental results showed that, when the steering gear of the robot rotates 1°, the toe can lift 7 mm (5% of body height), and the maximum running speed of the robot can reach 390 mm/s (130% of the moveable body length per second).
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39

Ertas, Bugra H., and John M. Vance. "Rotordynamic Force Coefficients for a New Damper Seal Design." Journal of Tribology 129, no. 2 (2006): 365–74. http://dx.doi.org/10.1115/1.2464138.

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The objective of the following work was to determine frequency-dependent rotordynamic force coefficients for a new annular gas damper seal design. Both rotating and nonrotating experimental tests are presented for inlet pressures at 1000psig(69bar), a frequency excitation range of 20-300Hz, and rotor speeds up to 15,200rpm. Two different testing methods were used for determining coefficients: (1) dynamic pressure response method and (2) mechanical impedance method. The dynamic pressure method required the measurement of internal seal cavity pressure modulations in combination with the vibratory motion, whereas the mechanical impedance method used the measurement of external shaker forces, accelerations, and motion of the mechanical system. In addition to the new fully partitioned damper seal (FPDS) tests, the same experiments were conducted for a conventional pocket damper seal (PDS) design. Results of the frequency-dependent force coefficients and the internal seal dynamics for the two different gas damper seals are compared. The conclusions of the tests show that the FPDS design possesses significantly more positive direct damping and direct stiffness compared to the conventional PDS. The experiments also show the measurement of same-sign cross-coupled (cross-axis) stiffness coefficients for both seals, which indicate that the seals do not produce a destabilizing influence on rotor-bearing systems.
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40

Feng, Xiao Jing, Xi Li, Wang Chao, Xue Hai Zhou, and Jun Neng Zhang. "A Hardware/Software Co-Design Flow for Dynamic Partial Reconfiguration." Advanced Materials Research 433-440 (January 2012): 5172–77. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.5172.

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The strict requirements on both performance and flexibility lead us to apply Dynamic Partial Reconfiguration (DPR) technology in embedded systems. However, existing DPR design flows are still immature, since previous works mainly focus on hardware designs while ignore software designs for DPR. To remedy this weakness, this paper proposes a hardware/software (HW/SW) co-design flow for DPR. The co-design flow aims at accelerating the process of DPR designs, and it merges software and hardware design flows to make them operate in parallel. Besides, in order to validate the effectiveness of our co-design flow, we implement a partial self-reconfigurable prototype system on Xilinx Virtex-5 platform and perform a set of experiments. Experimental results present that the reconfiguration overhead for partial reconfiguration is only 4.66% against global reconfiguration in our prototype. It’s also presented that our prototype can achieve a 23.6 × speedup over software algorithm solutions.
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41

Raudenbush, Stephen W., and Daniel Schwartz. "Randomized Experiments in Education, with Implications for Multilevel Causal Inference." Annual Review of Statistics and Its Application 7, no. 1 (2020): 177–208. http://dx.doi.org/10.1146/annurev-statistics-031219-041205.

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Education research has experienced a methodological renaissance over the past two decades, with a new focus on large-scale randomized experiments. This wave of experiments has made education research an even more exciting area for statisticians, unearthing many lessons and challenges in experimental design, causal inference, and statistics more broadly. Importantly, educational research and practice almost always occur in a multilevel setting, which makes the statistics relevant to other fields with this structure, including social policy, health services research, and clinical trials in medicine. In this article we first briefly review the history that led to this new era in education research and describe the design features that dominate the modern large-scale educational experiments. We then highlight some of the key statistical challenges in this area, including endogeneity of design, heterogeneity of treatment effects, noncompliance with treatment assignment, mediation, generalizability, and spillover. Though a secondary focus, we also touch on promising trial designs that answer more nuanced questions, such as the SMART design for studying dynamic treatment regimes and factorial designs for optimizing the components of an existing treatment.
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42

Adema, Niels, Menno Kloosterman, and Gerard Schepers. "Development of a second-order dynamic stall model." Wind Energy Science 5, no. 2 (2020): 577–90. http://dx.doi.org/10.5194/wes-5-577-2020.

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Abstract. Dynamic stall phenomena carry the risk of negative damping and instability in wind turbine blades. It is crucial to model these phenomena accurately to reduce inaccuracies in predicting design driving (fatigue and extreme) loads. Some of the inaccuracies in current dynamic stall models may be due to the fact that they are not properly designed for high angles of attack and that they do not specifically describe vortex shedding behaviour. The Snel second-order dynamic stall model attempts to explicitly model unsteady vortex shedding. This model could therefore be a valuable addition to a turbine design software such as Bladed. In this paper the model has been validated with oscillating aerofoil experiments, and improvements have been proposed for reducing inaccuracies. The proposed changes led to an overall reduction in error between the model and experimental data. Furthermore the vibration frequency prediction improved significantly. The improved model has been implemented in Bladed and tested against small-scale turbine experiments at parked conditions. At high angles of attack the model looks promising for reducing mismatches between predicted and measured (fatigue and extreme) loading, leading to possible lower safety factors for design and more cost-efficient designs for future wind turbines.
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43

Vdovin, D. S., I. V. Chichekin, Ya Yu Levenkov, and A. B. Fominykh. "Development of a quadricycle dynamic mathematical model methodology to calculate early design stages loads on the frame and chassis." Trudy NAMI, no. 2 (July 17, 2021): 46–57. http://dx.doi.org/10.51187/0135-3152-2021-2-46-57.

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Introduction (problem statement and relevance). To create a competitive vehicle in modern conditions, it is important to be able to determine its power elements loads at the early stages of design. A vehicle dynamic mathematical models allows you to solve this problem.The purpose of the study was to develop a dynamic mathematical model methodology of a quadricycle to determine its power elements loads under given operating conditions.Methodology and research methods. The article presents a dynamic mathematical model of a wheeled vehicle (quadricycle) technique using a created mathematical model within a solids dynamics modeling program and a real object experimental study to verify the mathematical model with an example of the obtained frame strength calculation under computer simulation loads.Scientific novelty and results. In the article the main stages of an utility quadricycle development and its dynamic mathematical model have been presented taking into account its design features and operating conditions. The main initial data necessary for creating an all-terrain vehicle dynamic mathematical model were identified. To confirm the developed dynamic model adequacy, a series of test site experiments was carried out. The obtained simulated results having been compared to the experimental data were highly convergent, which indicated the adequacy of the developed dynamic model of the ATV.Practical significance. The technique presented in the article allows to carry out virtual experiments to determine the main structural elements loads for subsequent strength, optimization and durability calculations.
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44

Song, Yumin, Bin Hu, and Xiaoliang Meng. "Efficient Dynamic Performance Prediction of Railway Bridges Situated on Small-Radius Reverse Curves." Shock and Vibration 2024 (April 9, 2024): 1–17. http://dx.doi.org/10.1155/2024/6666054.

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Bridges situated on small-radius reverse curves play a pivotal role within some railway networks, exerting influence over project-wide design progress. Typically, assessing the safety of bridge design parameters necessitates laborious vehicle-bridge dynamic coupling vibration numerical analysis or model experiments. To streamline the design process and enhance efficiency during the preliminary design phase, we propose an efficient method to assess the dynamic performance of bridges on small-radius reverse curves. This approach enables direct prediction of bridge dynamic performance based on design parameters, eliminating the need for numerical simulations and model experiments. We first develop a vehicle-bridge coupling vibration program grounded in train-curve bridge coupling vibration theory, validated using on-site measured data. Subsequently, through numerical simulation experiments, we evaluate 80 simply supported beam bridges on small-radius reverse curves under various operating conditions, generating ample dynamic response data for bridge pier tops and girders. These data are then compared with regulatory thresholds to assign dynamic performance labels. After identifying essential design parameters as data features using Fisher scores, we proceed to input these features into a support vector machine (SVM). Through supervised training with dynamic performance labels, this process empowers the SVM model to predict the dynamic performance of the bridge. Our results demonstrate that this method circumvents the need for detailed vehicle-bridge interaction analysis, yielding an impressive 86.9% accuracy in predicting dynamic performance and significantly boosting computational efficiency. Besides, the top five design parameters that significantly influence the prediction of bridge dynamic performance are obtained. This novel approach has the potential to expedite design assessments and enhance safety in railway bridge construction.
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45

Chang, F., and Z.-H. Lu. "Dynamic model of an air spring and integration into a vehicle dynamics model." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 222, no. 10 (2008): 1813–25. http://dx.doi.org/10.1243/09544070jauto867.

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It is worthwhile to design a more accurate dynamic model for air springs, to investigate the dynamic behaviour of an air spring suspension, and to analyse and guide the design of vehicles with air spring suspensions. In this study, a dynamic model of air spring was established, considering the heat transfer process of the air springs. Two different types of air spring were tested, and the experimental results verified the effectiveness of the air spring model compared with the traditional model. The key factors affecting the computation accuracy were studied and checked by comparing the results of the experiments and simulations. The new dynamic model of the air spring was integrated into the full-vehicle multi-body dynamics model, in order to investigate the air suspension behaviour and vehicle dynamics characteristics. The co-simulation method using ADAMS and MATLAB/Simulink was applied to integration of the air spring model with the full-vehicle multi-body dynamics model.
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46

Chatziparasidis, Iraklis, Dimitrios Giagopoulos, and Nickolas S. Sapidis. "Simulated dynamic finite-element experiments and automatic assembly synthesis for mechanical design automation." International Journal of Product Lifecycle Management 11, no. 1 (2018): 19. http://dx.doi.org/10.1504/ijplm.2018.091654.

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47

Sapidis, Nickolas S., Dimitrios Giagopoulos, and Iraklis Chatziparasidis. "Simulated dynamic finite-element experiments and automatic assembly synthesis for mechanical design automation." International Journal of Product Lifecycle Management 11, no. 1 (2018): 19. http://dx.doi.org/10.1504/ijplm.2018.10012726.

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48

Telen, Dries, Nick Van Riet, Flip Logist, and Jan Van Impe. "A differentiable reformulation for E-optimal design of experiments in nonlinear dynamic biosystems." Mathematical Biosciences 264 (June 2015): 1–7. http://dx.doi.org/10.1016/j.mbs.2015.02.006.

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49

Braniff, Nathan, and Brian Ingalls. "New opportunities for optimal design of dynamic experiments in systems and synthetic biology." Current Opinion in Systems Biology 9 (June 2018): 42–48. http://dx.doi.org/10.1016/j.coisb.2018.02.005.

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50

Pini, M., C. De Servi, M. Burigana, et al. "Fluid-dynamic design and characterization of a mini-ORC turbine for laboratory experiments." Energy Procedia 129 (September 2017): 1141–48. http://dx.doi.org/10.1016/j.egypro.2017.09.186.

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