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Journal articles on the topic 'NVH parametre'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Shi, Wen Ku, Guang Ming Wu, Shi Da Nie, Shi Chao Wang, and Zhi Yong Chen. "The Influence of Torsional Damper Performance Parameter on Transmission System Torsional Vibration." Applied Mechanics and Materials 241-244 (December 2012): 2015–18. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.2015.

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In order to research the influence that the torsional stiffness and damping characteristic of the torsional damper had on the transmission rotational vibration, a multi-degrees-of-freedom model of torsional vibration of a transmission system of an FR type vehicle was built. The frequency of the torsional vibration model of transmission system was calculated, and the forced vibration in the transmission was analyzed; the sensitivity of the torsional stiffness and damping characteristic of the torsional damper on vibration response was researched. This method provides theoretical basis for solvi

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2

Gao, Zhi Lin, Qing Hua Kong, Jian Pin Lin, Qiao Sheng Hu, and Yan Chen. "A New Design Method of Body-in-White Lightweight Considering NVH Performance." Advanced Materials Research 482-484 (February 2012): 1979–84. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1979.

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With the development of the auotomobile industry, the body-in-white has to meet the dual requirements of lightweight and NVH performance. This study put forward a new lightweight design method considering NVH performance. An example of lightweighting a non-load-bearing body-in-white was given to illustrate the design flow of this method and certificate the effectiveness and applicability. In order to accurately find out the neutral contribution panels which almost have no influence on the interior acoustic field, a new parameter, the weighted acoustic contribution, was introduced to analyze an

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Benninghaus, Anne, Christine Goffin, Steffen Leonhardt, and Klaus Radermacher. "Functional modeling of the craniospinal system for in-vitro parameter studies on the pathogenesis of NPH." Current Directions in Biomedical Engineering 3, no. 2 (2017): 825–28. http://dx.doi.org/10.1515/cdbme-2017-0173.

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AbstractNormal Pressure Hydrocephalus (NPH) has become a common disease in the elderly coming along with typical symptoms of dementia, gait ataxia and urinary incontinence, which make the differential diagnosis with other forms of dementia difficult. Furthermore the pathogenesis of NPH is still not understood. About 10% of all demented patients might be suffering from NPH [1]. Many hypotheses suggest that modified biomechanical boundary conditions affect the craniospinal dynamics inducing the pathogenesis of NPH. We present a novel approach for an in-vitro model of the craniospinal system to i

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Pasha, Hasan, Gil Jun Lee, Henry Zhang, Steve Hale, and Santosh Kottalgi. "Automated Material Parameter Calibration for an Electric Motor Stator." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (2021): 3454–58. http://dx.doi.org/10.3397/in-2021-2409.

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For accurate prediction of E-motor noise and vibration performance at the design stage, it is important to model the E-Motor stator structural behavior with high fidelity. Orthotropic material properties have been widely used in practice to simulate laminated steel in the stator. In these models, material constants are calibrated to match natural frequencies of critical modes such as oval/triangle/square modes. Typically, identifying accurate material properties is a manual, time-consuming process, involving lots of trial and error. This study presents an automated workflow to calibrate the ma

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Rillig, Matthias C., and Anika Lehmann. "Exploring the agricultural parameter space for crop yield and sustainability." New Phytologist 223, no. 2 (2019): 517–19. http://dx.doi.org/10.1111/nph.15744.

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Yang, Chang Hai, Xin Jin, Hai Sheng Song, and Wen Ku Shi. "The Vehicle Modal Analysis and Test Verification Based on Weld Joints Simulation." Advanced Materials Research 602-604 (December 2012): 2108–13. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.2108.

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As a reference to some minibus,establishing the Vehicle FEM Model including Body and Frame,and discussing the effect of joint simulation on vehicle modal analysis result;using the method based on environment incentive operational modal parameter identification to obtain vehicle modal,and compare test result with simulation result,it proves that the method of weld joint simulation is more accurate;At last, the FEM Model of Interior cavity is established and the NVH problems of the minibus are found and the improvements are Put forward.

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Farshidianfar, A., M. Ebrahimi, H. Rahnejat, M. T. Menday, and M. Moavenian. "Optimization of the high-frequency torsional vibration of vehicle driveline systems using genetic algorithms." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 216, no. 3 (2002): 249–62. http://dx.doi.org/10.1177/146441930221600305.

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Vehicle drivelines with manual transmissions are exposed to different dynamic engine torques under driving conditions. Engine torque can dramatically vary with throttle demand from coast to drive condition and, conversely, with throttle release from drive to coast. Abrupt application or release of throttle in slow moving traffic or rapid engagement of the clutch can be followed by an audible response, referred to in industry as the clonk noise. This paper presents a complete dynamic model of a vehicle driveline for the optimization of high-frequency torsional vibration by the distributed-lumpe

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Tita, Amornthep, and Pichet Vanichchapongjaroen. "Bound states of Newton’s equivalent finite square well." Modern Physics Letters A 33, no. 33 (2018): 1850195. http://dx.doi.org/10.1142/s021773231850195x.

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In this paper, a one-parameter family of Newton’s equivalent Hamiltonians (NEH) for finite square well potential is analyzed in order to obtain bound state energy spectrum and wave functions. For a generic potential, each of the NEH is classically equivalent to one another and to the standard Hamiltonian yielding Newton’s equations. Quantum mechanically, however, they are expected to be different from each other. The Schrödinger’s equation coming from each NEH with finite square well potential is an infinite order differential equation. The matching conditions, therefore, demand the wave funct

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von Wysocki, Timo, Frank Rieger, Dimitrios Ernst Tsokaktsidis, and Frank Gauterin. "Generating Component Designs for an Improved NVH Performance by Using an Artificial Neural Network as an Optimization Metamodel." Designs 5, no. 2 (2021): 36. http://dx.doi.org/10.3390/designs5020036.

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In modern vehicle development, suspension components have to meet many boundary conditions. In noise, vibration, and harshness (NVH) development these are for example eigenfrequencies and frequency response function (FRF) amplitudes. Component geometry parameters, for example kinematic hard points, often affect multiple of these targets in a non intuitive way. In this article, we present a practical approach to find optimized parameters for a component design, which fulfills an FRF target curve. By morphing an initial component finite element model we create training data for an artificial neu

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Seibert, Jan. "Estimation of Parameter Uncertainty in the HBV Model." Hydrology Research 28, no. 4-5 (1997): 247–62. http://dx.doi.org/10.2166/nh.1998.15.

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Usually the HBV model is calibrated by seeking one optimal parameter set that represents the catchment. From experience we know, however, that it is hardly possible to find an unique parameter set. This is because of errors in both the model structure and the observed variables and because of interactions between the different model parameters. Therefore, there may be many sets of parameters which give similar good results during a calibration period, but their predictions may differ when simulating runoff in the future. In this study a Monte Carlo procedure was used to assess the uncertainty

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Raj, R., N. A. S. Hamm, C. van der Tol, and A. Stein. "Uncertainty analysis of gross primary production partitioned from net ecosystem exchange measurements." Biogeosciences Discussions 12, no. 16 (2015): 13967–4002. http://dx.doi.org/10.5194/bgd-12-13967-2015.

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Abstract. Gross primary production (GPP), separated from flux tower measurements of net ecosystem exchange (NEE) of CO2, is used increasingly to validate process-based simulators and remote sensing-derived estimates of simulated GPP at various time steps. Proper validation should include the uncertainty associated with this separation at different time steps. This can be achieved by using a Bayesian framework. In this study, we estimated the uncertainty in GPP at half hourly time steps. We used a non-rectangular hyperbola (NRH) model to separate GPP from flux tower measurements of NEE at the S

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Liu, Cheng Wu. "Modal Hammering Test and Sensitivity Analysis for BIW Vehicle." Applied Mechanics and Materials 599-601 (August 2014): 985–91. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.985.

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Aiming at the defects of classical modal parameter estimation approach, the impulse hammer modal test during body-in-white (BIW) stage was done through polyMAX method method. Based on modal analysis theory, an experimental model of BIW was established. The compositions of the experimental modal testing system, the design of testing scheme as well as its validation were described in detail in this paper. The collected data were identified via the polyMAX modal analysis method. The dynamic characteristics of BIW were confirmed by Modal Assurance Criterion. Influence of low frequency distribution

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Kyprianou, A., J. Giacomin, K. Worden, M. Heidrich, and J. Bocking. "Differential evolution based identification of automotive hydraulic engine mount model parameters." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 214, no. 3 (2000): 249–64. http://dx.doi.org/10.1243/0954407001527402.

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Hydraulic engine mounts are commonly used in automotive applications, and numerical models exist for performing full-vehicle noise, vibration and harshness (NVH) studies by means of multibody simulation. The parameters of these models are usually determined by the manufacturer from first-principle numerical calculations, or by means of direct testing of the individual components. This paper describes, instead, a four-step identification method developed to determine the parameter values of a specific hydromount numerical model, the Freudenberg hydromount equations, a set of highly non-linear p

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Yang, Chao-Feng, Zhi-Hong Yin, Wen-Bin Shangguan, and Xiao-Cheng Duan. "A Study on the Dynamic Performance for Hydraulically Damped Rubber Bushings with Multiple Inertia Tracks and Orifices: Parameter Identification and Modeling." Shock and Vibration 2016 (2016): 1–16. http://dx.doi.org/10.1155/2016/3695950.

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Hydraulically damped rubber bushings (HDBs) are important for vehicle noise, vibration, and harshness (NVH) performance as they are able to decay the vehicle’s oscillation induced by engine and road. The dynamic stiffness and loss angle of an HDB are crucial and it is significant to investigate the relations between the design parameters with the dynamic stiffness and loss angle. Therefore, the force-deflection relation of the HDB is measured statically and the dynamic stiffness and loss angle are measured dynamically and the test data are analyzed with a view to examine how the measurement re

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15

Xiao, Yue. "A New Method for Determining Optimal Regularization Parameter in Near-Field Acoustic Holography." Shock and Vibration 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/7303294.

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Tikhonov regularization method is effective in stabilizing reconstruction process of the near-field acoustic holography (NAH) based on the equivalent source method (ESM), and the selection of the optimal regularization parameter is a key problem that determines the regularization effect. In this work, a new method for determining the optimal regularization parameter is proposed. The transfer matrix relating the source strengths of the equivalent sources to the measured pressures on the hologram surface is augmented by adding a fictitious point source with zero strength. The minimization of the

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16

Zhang, Jun, Guo Zhe Shen, Yu Du, and Ping Hu. "Modal Analysis of a Lightweight Engine Hood Design Considering Stamping Effects." Applied Mechanics and Materials 281 (January 2013): 364–69. http://dx.doi.org/10.4028/www.scientific.net/amm.281.364.

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Modal frequency distribution of automotive structures or sub-structures is an important factor affecting the NVH performance. During lightweight optimizations of a part, the modal characteristics of the new design is often kept the same as those of the reference design to ensure that the NVH performance is not degraded. However, the effects of the part manufacturing process on the modal parameters are usually ignored in the design stage. In this study, four alternative designs of replacing the original steel hood of a passenger car with lightweight aluminum material are proposed. The stamping

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17

Saharuna, Zawiyah, Rini Nur, and Ahmad Sandi. "Analisis Quality Of Service Jaringan Load Balancing Menggunakan Metode PCC Dan NTH." CESS (Journal of Computer Engineering, System and Science) 5, no. 1 (2020): 131. http://dx.doi.org/10.24114/cess.v5i1.14629.

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Penelitian ini menganalisis kinerja dari dua metode load balancing yaitu Nth dan Per Connection Classifier (PCC). Kedua metode tersebut diimplementasikan pada suatu topologi jaringan yang menggunakan dua line ISP dengan memberikan parameter limit bandwidth setiap ISP. Implementasi metode load balancing dilakukan menggunakan MikroTik RouterBoard. Pengujian yang dilakukan adalah dengan mengukur kinerja konektifitas jaringan, mekanisme failover dan Quality of Service (QoS) jaringan dari kedua metode load balancing. Hasil penelitian menunjukkan bahwa penerapan load balancing dapat menyeimbangkan n

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18

Wang, Leizhen, and Guorong Wang. "Experimental and Theoretical Study on the Critical Breaking Velocity of Marine Natural Gas Hydrate Sediments Breaking by Water Jet." Energies 13, no. 7 (2020): 1725. http://dx.doi.org/10.3390/en13071725.

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Water jet technology is a key technology in the marine natural gas hydrate (NGH) solid fluidization mining method. As an important parameter in water jet breaking NGH sediments technology, the critical breaking velocity of NGH sediments is unknown. In the present research, an orthogonal design experiment is carried out to study the critical velocity of NGH breakage by water jet, using frozen soil and sand as experimental samples. First, the time it takes to reach maximum NGH breaking depth is determined. Then, ultimate breaking distance is studied with respect to the NGH saturation, jet pressu

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Ishola, Taiwo Abass, Olatayo Timothy Olabisi, and Adesanya Kazeem Kehinde. "Parameter Estimation of Fractional Trigonometric Polynomial Regression Model." JOURNAL OF UNIVERSITY OF BABYLON for pure and applied sciences 27, no. 1 (2019): 519–26. http://dx.doi.org/10.29196/jubpas.v27i1.2208.

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Trigonometric Polynomial Regression is a form of non-linear regression in which the relationship between the outcome variable and risk variable is Fractional modeled as 1/nth degree polynomial regression by combining the function of cos(nx) and sin(nx) on the value of natural numbers. The model was used to analyze the relationship between three continuous and periodic variables. Coefficients of the model were estimated using the Maximum Likelihood Estimate (MLE) method. From the results, the model obtained indicated that an increased in body mass index will increase the level of blood pressure

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Paschou, Stavroula A., Eleni Palioura, Dimitrios Ioannidis, et al. "Adrenal hyperandrogenism does not deteriorate insulin resistance and lipid profile in women with PCOS." Endocrine Connections 6, no. 8 (2017): 601–6. http://dx.doi.org/10.1530/ec-17-0239.

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Objective The aim of this study was to investigate the impact of adrenal hyperandrogenism on insulin resistance and lipid profile in women with polycystic ovary syndrome (PCOS). Patients and methods We studied 372 women with PCOS according to the NIH criteria. 232 age- and BMI-matched women served as controls in order to define adrenal hyperandrogenism (DHEA-S >95th percentile). Then, patients with PCOS were classified into two groups: with adrenal hyperandrogenism (PCOS-AH, n = 108) and without adrenal hyperandrogenism (PCOS-NAH, n = 264). Anthropometric measurements were recorded. Fasting

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Lespinas, Franck, Ashu Dastoor, and Vincent Fortin. "Performance of the dynamically dimensioned search algorithm: influence of parameter initialization strategy when calibrating a physically based hydrological model." Hydrology Research 49, no. 4 (2017): 971–88. http://dx.doi.org/10.2166/nh.2017.139.

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Abstract This study presents an evaluation of the performance of the dynamically dimensioned search (DDS) algorithm when calibrating the hydrological component of the Visualizing Ecosystems for Land Management Assessments (VELMA) ecohydrological model. Two calibration strategies were tested for the initial parameter values: (1) a ‘high-cost strategy’, where 100 sets of initial parameter values were randomly chosen within the overall parameter space, and (2) a ‘low-cost strategy’, where a unique set of initial parameter values was derived from the available field data. Both strategies were test

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Peng, Wei-Qi, Shou-Fu Tian, and Tian-Tian Zhang. "Characteristics of the breather waves, lump waves and semi-rational solutions in a generalized (2+1)-dimensional asymmetrical Nizhnik–Novikov–Veselov equation." Modern Physics Letters B 33, no. 28 (2019): 1950350. http://dx.doi.org/10.1142/s0217984919503500.

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In this work, we study a generalized (2[Formula: see text]+[Formula: see text]1)-dimensional asymmetrical Nizhnik–Novikov–Veselov (NNV) equation. Its Hirota bilinear form is constructed via the Bell polynomial. Based on the obtained bilinear form, the Nth-order breather waves are derived explicitly under certain parameter constraints. Moreover, we generate the nonsingular Nth-order lump waves through applying the long wave limit method. Additionally, we successfully present the semi-rational waves containing the combination of lump waves and single-soliton waves, the combination of lump waves

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23

Wong, Pak Kin, Zheng Chao Xie, Yu Cong Cao, and Ming Li. "Design and Optimization on Active Engine Mounting Systems for Vibration Isolation." Applied Mechanics and Materials 479-480 (December 2013): 202–9. http://dx.doi.org/10.4028/www.scientific.net/amm.479-480.202.

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In this paper, based on the previous research experiences in the lumped parameter modeling and study of active control mounts model, a test bench model of ACM in powertrain is described and the vibration model is implemented in MATLAB. In order to validate the implementation of the state equations in this work, a finite element analysis (FEA) method is used in ANSYS and compared with analytical model for validate. After the validation, the control strategy is integrated into the analytical model by using the linear quadratic regulator (LQR) method, which is a well know design technique that pr

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Rai, R. K., S. Sarkar, and H. G. Gundekar. "Adequacy of two-parameter beta distribution for deriving the unit hydrograph." Hydrology Research 39, no. 3 (2008): 201–8. http://dx.doi.org/10.2166/nh.2008.038.

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In the past, to derive the unit hydrograph (UH) various distribution functions have been utilized so far, though they had their own limitations. In this study, the applicability of two-parameter beta distribution has been explored for the derivation of UH. The parameters of the distribution function were estimated using the Genetic Algorithm which facilitates the minimization of global error. The suitability of the derived UH resulting from the two-parameter beta distribution was verified by comparing the UH derived by the two-parameter gamma distribution. The results obtained from both the di

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Jacobsen, Ole H., Feike J. Leij, and Martinus Th van Genuchten. "Parameter Determination for Chloride and Tritium Transport in Undisturbed Lysimeters during Steady Flow." Hydrology Research 23, no. 2 (1992): 89–104. http://dx.doi.org/10.2166/nh.1992.0007.

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Breakthrough curves of Cl and 3H2O were obtained during steady unsaturated flow in five lysimeters containing an undisturbed coarse sand (Orthic Haplohumod). The experimental data were analyzed in terms of the classical two-parameter convection-dispersion equation and a four-parameter two-region type physical nonequilibrium solute transport model. Model parameters were obtained by both curve fitting and time moment analysis. The four-parameter model provided a much better fit to the data for three soil columns, but performed only slightly better for the two remaining columns. The retardation f

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Campos, D. "On the Time-Independent Perturbation Theory." Zeitschrift für Naturforschung A 50, no. 8 (1995): 727–36. http://dx.doi.org/10.1515/zna-1995-0804.

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Abstract The time-independent perturbation theory is developed for an arbitrary operator which can be expanded in powers of the perturbation parameter λ. A unified formulation allows the establishment of a formal interrelation between the methods of Rayleigh-Schrödinger and of Bril louin-Wigner. We introduce a nonunitary transformation operator to connect the nth eigenket of Ĥ(0) with the nth eigenket of Ĥ(λ) and it is proven that this operator satisfies a Lippmann-Schwinger type equation. A perturbation method based on this equation is proposed, and it is applied to describe an electron movi

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Chaudhary, Shushobhit, C. T. Dhanya, and Arun Kumar. "Sequential calibration of a water quality model using reach-specific parameter estimates." Hydrology Research 49, no. 4 (2017): 1042–55. http://dx.doi.org/10.2166/nh.2017.246.

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Abstract Calibration is the most critical phase in any water quality modelling process. This study proposes a sequential calibration methodology for any water quality model using reach-specific estimates of model parameters, which would aid in the improved prediction of river water quality characteristics. The proposed methodology accounts for the heterogeneity of river reaches, i.e., diverse characteristics of different reaches on the river stretch. The water quality model, QUAL2K, is coupled with MATLAB, a computing platform, to facilitate sequential estimation of reach-wise model parameters

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Legg, Sonya. "A Simple Criterion to Determine the Transition from a Localized Convection to a Distributed Convection Regime*." Journal of Physical Oceanography 34, no. 12 (2004): 2843–46. http://dx.doi.org/10.1175/jpo2653.1.

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Abstract A recent numerical study by Noh et al. of open-ocean deep convection in the presence of a single geostrophic eddy showed that two possible regimes exist: 1) the localized convection regime in which baroclinic instability of the eddy dominates, with slantwise fluxes and restratification, and 2) the distributed convection regime in which vertical mixing dominates. Noh et al. found that localized convection dominates for relatively small buoyancy forcing, strong eddies, and strong surface ambient stratification. Here it is shown that this regime transition can be expressed in terms of a

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Sambo, J. P. B., B. V. Gemao, and J. B. Bornales. "Fractional Brownian modeled linear polymer chains with one dimensional Metropolis Monte Carlo simulation." International Journal of Modern Physics: Conference Series 36 (January 2015): 1560017. http://dx.doi.org/10.1142/s2010194515600174.

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The scaling expression for fractional Brownian modeled linear polymer chains was obtained both theoretically and numerically. Through the probability distribution of fractional Brownian paths, the scaling was found out to be 〈R2〉 ~ N2H, where R is the end-to-end distance of the polymer chain, N is the number of monomer units and H is the Hurst parameter. Numerical data was generated through the use of Monte Carlo simulation implementing the Metropolis algorithm. Results show good agreement between numerical and theoretical scaling constants after some parameter optimization. The probability di

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Hailegeorgis, Teklu T., and Knut Alfredsen. "Multi-basin and regional calibration based identification of distributed precipitation–runoff models for hourly runoff simulation: calibration and transfer of full and partial parameters." Hydrology Research 47, no. 2 (2015): 239–59. http://dx.doi.org/10.2166/nh.2015.174.

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Identification of distributed precipitation–runoff models for hourly runoff simulation based on transfer of full parameters (FP) and partial parameters (PP) are lacking for boreal mid-Norway. We evaluated storage–discharge relationships based model (Kirchmod), the Basic-Grid-Model (BGM) and a simplified Hydrologiska Byråns Vattenbalansavdelning (HBV) model for multi-basins (26 catchments). A regional calibration objective function, which uses all streamflow records in the region, was used to optimize local calibration parameters for each catchment and regional parameters yielding maximum regio

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Lu, Qiu Ying, and Wei Peng Zhang. "Positive Solutions for the nth-Order Delay Differential System with Multi-Parameter." Applied Mechanics and Materials 50-51 (February 2011): 185–89. http://dx.doi.org/10.4028/www.scientific.net/amm.50-51.185.

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In this paper, we are concerned with the existence of positive solutions for the nonlinear eigenvalue problem of the nth-order delay di erential system. The main results in this paper generalize some of the existing results in the literature. Our proofs are based on the well-known Guo-Krasnoselskii xed-point theorem. Three main results are given out, the rst two of which refer to the existence while the last one not only guarantees to its existence but also is pertinent to its multiplicity.

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Zhou, Yanlai, Shenglian Guo, Chong-Yu Xu, Hua Chen, Jiali Guo, and Kairong Lin. "Probabilistic prediction in ungauged basins (PUB) based on regional parameter estimation and Bayesian model averaging." Hydrology Research 47, no. 6 (2016): 1087–103. http://dx.doi.org/10.2166/nh.2016.058.

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Predictions in ungauged basins (PUB) are widely considered to be one of the fundamentally challenging research topics in the hydrological sciences. This paper couples a regional parameter transfer module with a probabilistic prediction module in order to obtain probabilistic PUB. Steps in the proposed probabilistic PUB include: (1) variable infiltration capacity-three layers (VIC-3L) model description; (2) three regional parameter transfer schemes for ungauged basins, i.e., regression analysis, spatial proximity, and physical similarity; (3) probabilistic PUB using Bayesian model averaging (BM

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Cabada, Alberto, and Lorena Saavedra. "Characterization of non-disconjugacy for a one parameter family of nth-order linear differential equations." Applied Mathematics Letters 65 (March 2017): 98–105. http://dx.doi.org/10.1016/j.aml.2016.10.010.

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Lu, Gaoli, and Meiqiang Feng. "Positive solutions of nth-order impulsive eigenvalue problems with an advanced argument." Asian-European Journal of Mathematics 10, no. 04 (2017): 1750072. http://dx.doi.org/10.1142/s1793557117500723.

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In this paper, we study a [Formula: see text]th-order impulsive eigenvalue problem with an advanced argument. We shall establish several criteria for the optimal intervals of the parameter [Formula: see text] so as to ensure existence of single or many positive solutions. Our methods are based on transformation technique, Hölder’s inequality and the eigenvalue theory.

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Niazkar, Majid, and Seied Hosein Afzali. "Parameter estimation of an improved nonlinear Muskingum model using a new hybrid method." Hydrology Research 48, no. 5 (2016): 1253–67. http://dx.doi.org/10.2166/nh.2016.089.

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Although various techniques have been proposed to estimate the parameters of different versions of the Muskingum model, more rigorous techniques and models are still required to improve the computational precision of the calibration process. In this research, a new hybrid technique was proposed for Muskingum parameter estimation. Based on the conducted comprehensive literature review on the Muskingum flood routing models, a new improved Muskingum model with nine constant parameters was presented. Since the inflow-weighted parameter in the proposed model is a function of inflow hydrograph, it v

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Guo, Jing, and Xiaoling Su. "Parameter sensitivity analysis of SWAT model for streamflow simulation with multisource precipitation datasets." Hydrology Research 50, no. 3 (2019): 861–77. http://dx.doi.org/10.2166/nh.2019.083.

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Abstract Streamflow in the Shiyang River basin is numerically investigated based on the soil and water assessment tool (SWAT). The interpolation precipitation datasets of GSI, multisource satellite and reanalysis precipitation datasets including TRMM, CMDF, CFSR, CHIRPS and PGF are specially applied as the inputs for SWAT model, and the sensitivities of model parameters, as well as streamflow prediction uncertainties, are discussed via the sequential uncertainty fitting procedure (SUFI-2). Results indicate that streamflow simulation can be effectively improved by downscaling the precipitation

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Blasone, R. S., H. Madsen, and Dan Rosbjerg. "Parameter estimation in distributed hydrological modelling: comparison of global and local optimisation techniques." Hydrology Research 38, no. 4-5 (2007): 451–76. http://dx.doi.org/10.2166/nh.2007.024.

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Much research has been spent in the last three decades in developing more effective and efficient automatic calibration procedures and in demonstrating their applicability to hydrological problems. Several problems have emerged when applying these procedures to calibration of conceptual rainfall–runoff and groundwater (GW) models, such as computational time, large number of calibration parameters, parameter identifiability, model response surface complexity, handling of multiple objectives and parameter equifinality. All these are expected to be much more severe for more complex models, for wh

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Perumal, Muthiah, Tommaso Moramarco, Silvia Barbetta, Florisa Melone, and Bhabagrahi Sahoo. "Real-time flood stage forecasting by Variable Parameter Muskingum Stage hydrograph routing method." Hydrology Research 42, no. 2-3 (2011): 150–61. http://dx.doi.org/10.2166/nh.2011.063.

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The application of a Variable Parameter Muskingum Stage (VPMS) hydrograph routing method for real-time flood forecasting at a river gauging site is demonstrated in this study. The forecast error is estimated using a two-parameter linear autoregressive model with its parameters updated at every routing time interval of 30 minutes at which the stage observations are made. This hydrometric data-based forecast model is applied for forecasting floods at the downstream end of a 15 km reach of the Tiber River in Central Italy. The study reveals that the proposed approach is able to provide reliable f

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Hughes, Denis A., Evison Kapangaziwiri, and Jane Tanner. "Spatial scale effects on model parameter estimation and predictive uncertainty in ungauged basins." Hydrology Research 44, no. 3 (2012): 441–53. http://dx.doi.org/10.2166/nh.2012.049.

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The most appropriate scale to use for hydrological modelling depends on the model structure, the purpose of the results and the resolution of available data used to quantify parameter values and provide the climatic forcing. There is little consensus amongst the community of model users on the appropriate model complexity and number of model parameters that are needed for satisfactory simulations. These issues are not independent of modelling scale, the methods used to quantify parameter values, nor the purpose of use of the simulations. This paper reports on an investigation of spatial scale

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Chen, Hong, and David D. Yao. "Derivatives of the expected delay in the GI/G/1 Queue." Journal of Applied Probability 27, no. 4 (1990): 899–907. http://dx.doi.org/10.2307/3214832.

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Consider the GI/G/1 queue in which the interarrival/service times are parameterized. The derivatives (with respect to the parameter) of the expected delay of the nth job and its limit are derived and expressed in terms of the expectation of certain stochastic derivatives. Applications of these derivatives in stochastic optimization and random walk are illustrated.

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Chen, Hong, and David D. Yao. "Derivatives of the expected delay in the GI/G/1 Queue." Journal of Applied Probability 27, no. 04 (1990): 899–907. http://dx.doi.org/10.1017/s0021900200028060.

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Consider the GI/G/1 queue in which the interarrival/service times are parameterized. The derivatives (with respect to the parameter) of the expected delay of the nth job and its limit are derived and expressed in terms of the expectation of certain stochastic derivatives. Applications of these derivatives in stochastic optimization and random walk are illustrated.

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Lawrence, Deborah, and Ingjerd Haddeland. "Uncertainty in hydrological modelling of climate change impacts in four Norwegian catchments." Hydrology Research 42, no. 6 (2011): 457–71. http://dx.doi.org/10.2166/nh.2011.010.

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Projections for the hydrological impacts of climate change are necessarily reliant on a chain of models for which numerous alternative models and approaches are available. Many of these alternatives produce dissimilar results which can undermine their use in practical applications due to these differences. A methodology for developing climate change impact projections and for representing the range of model outcomes is demonstrated based on the application of a hydrological model with input data from six regional climate scenarios, which have been further adjusted to match local conditions. Mu

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Zhang, Danrong, Liru Zhang, Yiqing Guan, Xi Chen, and Xinfang Chen. "Sensitivity analysis of Xinanjiang rainfall–runoff model parameters: a case study in Lianghui, Zhejiang province, China." Hydrology Research 43, no. 1-2 (2012): 123–34. http://dx.doi.org/10.2166/nh.2011.131.

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The Xinanjiang rainfall–runoff model has been successfully applied in many humid and sub-humid areas in China since 1973. The wide application is due to the simple model structure, the clear physical meaning of the parameters and the well-defined model calibration procedure. However, due to a data scarcity problem and short runoff concentration time, its applications to small drainage basins are difficult. Therefore, we investigate the model application in Lianghui, a small drainage basin of Zhejiang province in China. By using generalized likelihood uncertainty estimation (GLUE) methodology,

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Souza, Ricardo Krause Martinez de, Samanta Fabrício Blattes da Rocha, Rodrigo Tomazini Martins, Pedro André Kowacs, and Ricardo Ramina. "Gait in normal pressure hydrocephalus: characteristics and effects of the CSF tap test." Arquivos de Neuro-Psiquiatria 76, no. 5 (2018): 324–31. http://dx.doi.org/10.1590/0004-282x20180037.

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ABSTRACT Normal pressure hydrocephalus (NPH), described by Hakim and Adams in 1965, is characterized by gait apraxia, urinary incontinence, and dementia. It is associated with normal cerebrospinal fluid (CSF) pressure and ventricular dilation that cannot be attributed to cerebral atrophy. Objectives: To evaluate gait characteristics in patients with idiopathic NPH and investigate the effect of the CSF tap test (CSF-TT) on gait. Methods: Twenty-five patients diagnosed with probable idiopathic NPH were submitted to the CSF-TT. The procedure aimed to achieve changes in gait parameters. Results: F

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BI, C. X., X. Z. CHEN, and J. CHEN. "DISTRIBUTED SOURCE BOUNDARY POINT METHOD-BASED NEARFIELD ACOUSTIC HOLOGRAPHY FOR RECONSTRUCTING THE ACOUSTIC RADIATION FROM ARBITRARILY SHAPED OBJECTS." Journal of Computational Acoustics 14, no. 04 (2006): 379–95. http://dx.doi.org/10.1142/s0218396x06003128.

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Nearfield acoustic holography (NAH) is an indirect technique for identifying noise sources and visualizing acoustic field. Recently, several different methods, such as the spatial Fourier transform method, the boundary element method (BEM) and the Helmholtz equation-least squares (HELS) method, have been used to realize the NAH successfully. In the paper, a novel numerical method, the distributed source boundary point method (DSBPM), is proposed to realize the NAH. In the method, the transfer matrices from the reconstructed surface to the hologram surface are constructed indirectly by a set of

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Biondi, Daniela, and Davide Luciano De Luca. "Rainfall-runoff model parameter conditioning on regional hydrological signatures: application to ungauged basins in southern Italy." Hydrology Research 48, no. 3 (2016): 714–25. http://dx.doi.org/10.2166/nh.2016.097.

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Parameter estimation for rainfall-runoff models in ungauged basins is a key aspect for a wide range of applications where streamflow predictions from a hydrological model can be used. The need for more reliable estimation of flow in data scarcity conditions is, in fact, thoroughly related to the necessity of reducing uncertainty associated with parameter estimation. This study extends the application of a Bayesian procedure that, given a generic rainfall-runoff model, allows for the assessment of posterior parameter distribution, using a regional estimate of ‘hydrological signatures’ available

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Termini, D., and T. Moramarco. "Application of entropic approach to estimate the mean flow velocity and Manning roughness coefficient in a high-curvature flume." Hydrology Research 48, no. 3 (2016): 634–45. http://dx.doi.org/10.2166/nh.2016.106.

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The entropy-based approach allows the estimation of the mean flow velocity in open channel flow by using the maximum flow velocity. The linear relationship between the mean velocity, umax, and the mean flow velocity, um, through the dimensionless parameter Φ(M), has been verified both in natural rivers and in laboratory channels. Recently, the authors of this study investigated the reliability of the entropy-based formula in a straight channel and under different bed and side-walls' roughness conditions. The present study aims to further validate the entropy-based approach and to explore the e

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Nourani, Vahid, Ahmad Fakheri Fard, Hoshin V. Gupta, David C. Goodrich, and Faegheh Niazi. "Hydrological model parameterization using NDVI values to account for the effects of land cover change on the rainfall–runoff response." Hydrology Research 48, no. 6 (2017): 1455–73. http://dx.doi.org/10.2166/nh.2017.249.

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Abstract Classic rainfall–runoff models usually use historical data to estimate model parameters and mean values of parameters are considered for predictions. However, due to climate changes and human effects, model parameters change temporally. To overcome this problem, normalized difference vegetation index (NDVI) derived from remotely sensed data was used in this study to investigate the effect of land cover variations on hydrological response of watersheds using a conceptual rainfall–runoff model. The study area consists of two sub-watersheds (Hervi and Lighvan) with varied land cover cond

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Li, Zhanling, Quanxi Shao, Qingyun Tian, and Louie Zhang. "Copula-based drought severity-area-frequency curve and its uncertainty, a case study of Heihe River basin, China." Hydrology Research 51, no. 5 (2020): 867–81. http://dx.doi.org/10.2166/nh.2020.173.

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Abstract Copulas are appropriate tools in drought frequency analysis. However, uncertainties originating from copulas in such frequency analysis have not received significant consideration. This study aims to develop a drought severity-areal extent-frequency (SAF) curve with copula theory and to evaluate the uncertainties in the curve. Three uncertainty sources are considered: different copula functions, copula parameter estimations, and copula input data. A case study in Heihe River basin in China is used as an example to illustrate the proposed approach. Results show that: (1) the dependence

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Xu, Jing, Liliang Ren, Fei Yuan, and Xiaofan Liu. "The solution to DEM resolution effects and parameter inconsistency by using scale-invariant TOPMODEL." Hydrology Research 43, no. 1-2 (2012): 146–55. http://dx.doi.org/10.2166/nh.2011.130.

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The parameter calibration of TOPMODEL is influenced by digital elevation model (DEM) resolution because of the utilization of scale-dependent topographic index representing hydrologic similarity. The downscaled DEM from the coarse-resolution DEM and the resolution factor are applied to remove the DEM scale effects on the upslope area. Meanwhile, a fractal method is introduced as an approach to account for the effect of DEM resolution on slope. A significant improvement on the estimation of slope directly from the coarse-resolution data is made by applying fractal parameters that are computed f

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