scholarly journals An Accuracy Problem of the Fwd Time History with Regard to the Application of the Sasw Method

2017 ◽  
Vol 13 (2) ◽  
pp. 120-124
Author(s):  
Jozef Komačka
Keyword(s):  
Shear Modulus ◽  
Bearing Capacity ◽  
Evaluation Method ◽  
Time History ◽  
Evaluation Process ◽  
History Data ◽  
Consecutive Time ◽  
Equivalent Modulus ◽  
Propagation Of Waves ◽  
Falling Weight

Abstract A Falling Weight Deflectometer (FWD) represents one group of the devices used for diagnostics of pavement bearing capacity. Usually, the FWD dynamic load is substituted by a static load in the evaluation process to determine the equivalent modulus of a pavement structure or modulus of pavement layers. However, the data recorded during a bearing capacity test by FWD can be used to reveal the propagation of a dynamic impulse generated by FWD. It gives a possibility to use them in an evaluation method based on the propagation of waves generated by dynamic impulse. Therefore, the FWD time history data was assessed with regard to possible using in the method of the Spectral Analysis of Surface Waves. Basically, the possibility to determine the velocity of a generated surface wave was evaluated. It was found out the same deflection values exist at consecutive time intervals in the relevant part of the time history data (the arrival of the front of the wave or the area of maximum deflection value). Two methods were used to determine the exact time of the wave occurrence at receivers. It was concluded the differences between the used methods exist. It means the calculated velocities of a wave and shear modulus are also different. Importance of the shear modulus differences were estimated using the Slovak bearing capacity classification based on elastic modulus values. Taking into account the range of modulus in one classification class it can be stated the differences in the shear modulus determined according to used two methods could be very significant if the values calculated for short distance of the receiver are used. In the case of longer distance of the receivers the differences are not so high and significant.

scholarly journals Propagation of Surface Waves in Asphalt Pavements Generated by Different Load Impulse of Falling Weight Deflectometer

2019 ◽  
Vol 15 (1) ◽  
pp. 29-35
Author(s):  
Jozef Komačka ◽  
IIja Březina
Keyword(s):  
Surface Waves ◽  
Travel Time ◽  
Time History ◽  
Asphalt Pavements ◽  
Load Force ◽  
Falling Weight Deflectometer ◽  
Waves Propagation ◽  
Propagation Of Waves ◽  
Falling Weight ◽  
The Waves

Abstract The propagation of waves generated by load impulse of two FWD types was assessed using test outputs in the form of time history data. The calculated travel time of wave between the receiver in the centre of load and others receivers showed the contradiction with the theory as for the receivers up to 600 (900) mm from the centre of load. Therefore, data collected by the sensors positioned at the distance of 1200 and 1500 mm were used. The influence of load magnitude on the waves propagation was investigated via the different load force with approximately the same load time and vice versa. Expectations relating to the travel time of waves, depending on the differences of load impulse, were not met. The shorter travel time of waves was detected in the case of the lower frequencies. The use of load impulse magnitude as a possible explanation was not successful because opposite tendencies in travel time were noticed.

Use of falling weight deflectometer time history data for the analysis of seasonal variation in pavement response

2010 ◽  
Vol 37 (9) ◽  
pp. 1224-1231 ◽  
Author(s):  
Kate Deblois ◽  
Jean-Pascal Bilodeau ◽  
Guy Doré
Keyword(s):  
Phase Angle ◽  
Time History ◽  
Test Site ◽  
Flexible Pavement ◽  
Dissipated Energy ◽  
Falling Weight Deflectometer ◽  
History Data ◽  
The Road ◽  
Pavement Structures ◽  
Falling Weight

This paper presents the results of an exploratory analysis of falling weight deflectometer (FWD) data collected on a large project about the spring thaw behaviour of pavements. The test site includes four test sections, two of which are conventional flexible pavement structures, whereas the other two are built with a cement-treated base. The aim of this study is to verify the applicability of using FWD time history data to evaluate damage to a road during the thawing period. The applicability of the analysis techniques is verified through the phase angle and dissipated energy. The data analyzed were obtained from tests conducted with an FWD on one flexible pavement test section. The results obtained showed a clear difference between the winter, thawing, and summer periods. It was found that the phase angle and dissipated energy can be used to evaluate the road damage during the thawing period through quantification of the phase angle and dissipated energy. These factors can also be used to describe the pavement behaviour in terms of elasticity and viscoelasticity.

Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities: Part 2 — Application of CCFS Method to the Multiply Supported Systems

2014 ◽  
Author(s):  
Koichi Tai ◽  
Keisuke Sasajima ◽  
Shunsuke Fukushima ◽  
Noriyuki Takamura ◽  
Shigenobu Onishi
Keyword(s):  
Power Plant ◽  
Nuclear Power ◽  
Seismic Isolation ◽  
Evaluation Method ◽  
Time History ◽  
Piping System ◽  
History Analysis ◽  
Piping Systems ◽  
Isolation Systems ◽  
Seismic Isolation Systems

This paper provides a part of series of “Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities”. Paper is focused on the seismic evaluation method of the multiply supported systems, as the one of the design methodology adopted in the equipment and piping system of the seismic isolated nuclear power plant in Japan. Many of the piping systems are multiply supported over different floor levels in the reactor building, and some of the piping systems are carried over to the adjacent building. Although Independent Support Motion (ISM) method has been widely applied in such a multiply supported seismic design of nuclear power plant, it is noted that the shortcoming of ignoring correlations between each excitations is frequently misleaded to the over-estimated design. Application of Cross-oscillator, Cross-Floor response Spectrum (CCFS) method, proposed by A. Asfura and A. D. Kiureghian[1] shall be considered to be the excellent solution to the problems as mentioned above. So, we have introduced the algorithm of CCFS method to the FEM program. The seismic responses of the benchmark model of multiply supported piping system are evaluated under various combination methods of ISM and CCFS, comparing to the exact solutions of Time History analysis method. As the result, it is demonstrated that the CCFS method shows excellent agreement to the responses of Time History analysis, and the CCFS method shall be one of the effective and practical design method of multiply supported systems.

Research on Comprehensive Evaluation of Service Capability of the Third-Party Logistics Suppliers with AHP and Gray Entropy Theory

2021 ◽  
Author(s):  
Jun Li ◽  
Xuhua Pan ◽  
Mingxiao Li ◽  
Gang Wang ◽  
Zhixin Zhang
Keyword(s):  
Evaluation System ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Evaluation Process ◽  
Third Party ◽  
Third Party Logistics ◽  
Comprehensive Service ◽  
Service Capability ◽  
Capability Evaluation

To solve the problem of third-party logistics (3PL) evaluation and selection, a hybrid method with AHP and gray theory is proposed. First, the literature review about the 3PL evaluation method and technology is introduced. Furthermore, TPL comprehensive service capability evaluation system is established from aspects of service, time, cost and enterprise qualification. Besides, a comprehensive evaluation model process with gray entropy and AHP is introduced. Finally, a detailed evaluation process of 3PL supplier service capability in F company is introduced by an example, and the results show that the evaluation method in the paper is helpful to choose the TPL for logistics outsourcing.

scholarly journals Computer-Aided Color Aesthetic Evaluation Method Based on the Combination of Form and Color

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Wenke Kang ◽  
Shengfeng Qin ◽  
Quan Zhang
Keyword(s):  
Field Theory ◽  
Evaluation Method ◽  
Evaluation Model ◽  
Evaluation Process ◽  
Calculation Algorithm ◽  
Topological Graph ◽  
Aesthetic Evaluation ◽  
New Form ◽  
Color Field ◽  
Spencer Model

This paper presents a new method of color aesthetic evaluation based on the combination of form and color. According to the human visual physiological and psychological characteristics, this paper first proposes a new form-color field theory for the coupled form-color aesthetic evaluation based on the psychophysical field theory and the Moon and Spencer model. Second, it builds a coupled form-color topological graph for describing their interaction and develops a strength calculation algorithm for color harmony based on the new form-color field theory. Finally, it develops an aesthetic measure evaluation model for coupled form-color fields to evaluate the new theory. The experiment results show that the new coupled form-color aesthetic evaluation method is useful and can be integrated into an intelligent evaluation process for color design scheme.

Comprehensive Evaluation System and Elements for Hydrocarbon Traps

2014 ◽  
Vol 962-965 ◽  
pp. 112-116
Author(s):  
Guo Min Chen ◽  
Quan Wen Liu
Keyword(s):  
Evaluation System ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Evaluation Process ◽  
Evaluation Theory ◽  
Hydrocarbon Trap ◽  
Hydrocarbon Traps ◽  
Precision Trap ◽  
Comprehensive Evaluation System ◽  
Main Components

The hydrocarbon trap evaluation is theoretical guidance for the practical exploration of hydrocarbon traps, the present complicated exploration targets requires the conclusion of hydrocarbon trap evaluation more scientific and reliable so as to adapt to the requirement of high frequency, high precision trap exploration. With the guidance of system theory and modern scientific evaluation theory, modern hydrocarbon traps evaluation has already become a system engineering, which obviously characterized by the comprehensive evaluation, quantitative evaluation and comprehensive decision. In this paper the comprehensive evaluation system for hydrocarbon traps has been established, it indicated that the comprehensive evaluation tends to be a whole procedure which involves such aspects including evaluation contents, data, methods, techniques, and evaluation process specifically, so its main components includes: evaluation object characteristics, theoretical guidance, evaluation contents, methods, techniques, and database establishment. Furthermore, it emphasize closely on the analysis of the exploration objects, focus on the comprehensive geological research, supported by scientific exploration and thinking and computer technology, considered evaluation method and technology research as the key contents, and finally enable to provide reference for the modern hydrocarbon trap exploration when it appear to become increasingly complicated and subtle.

Fuzzy Comprehensive Evaluation on Multiple Constraint Factors of City Underground Space Development and Utilization

2013 ◽  
Vol 357-360 ◽  
pp. 1783-1788
Author(s):  
Chang An Zhou ◽  
Hong Ren ◽  
Jing Yang Zhou
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Evaluation Process ◽  
Fuzzy Comprehensive Evaluation ◽  
Evaluation Index System ◽  
Underground Space ◽  
Analytic Hierarchy ◽  
Constraint Factors ◽  
Multiple Constraint ◽  
Development And Utilization

In order to solve the existent problems of incomplete and ambiguous information during the evaluation on the multiple constraints factors of city underground space development and utilization, this paper applies analytic hierarchy process and fuzzy comprehensive evaluation method to construct the comprehensive evaluation index system of the multiple constraint factors of city underground space development and utilization, then Yuzhong District, Yubei District, Beibei District in Chongqing respectively as an example, and comprehensively to evaluate the multiple constraint factors of city underground space development and utilization. Example analysis shows that, it has high feasibility and effectiveness that applies the method of fuzzy comprehensive evaluation to the multiple constraint factors of city underground space development and utilization, and it can contribute to solve fuzziness and uncertainty problems of the evaluation process.

Confirmation of Reduction Effect Due to Tank’s Rocking Behavior and Proposal for a Simplified Evaluation Method of Nonlinear Seismic Response

2003 ◽  
Author(s):  
Satoru Yamaguchi ◽  
Hideyuki Tazuke ◽  
Kazuo Ishida
Keyword(s):  
Nonlinear Analysis ◽  
Seismic Response ◽  
Evaluation Method ◽  
Time History ◽  
Bottom Plate ◽  
Response Factor ◽  
Mass System ◽  
Nonlinear Seismic Response ◽  
Reduction Effect ◽  
Rocking Behavior

Aboveground LNG storage tank consists of inner and outer cylindrical containers. LNG is stored in the inner container made by 9%Ni steel. Anchorages are attached to some tanks in order to prevent bottom plate from excessive uplifting by seismic overturning moment. However tanks without anchorages have some probability that the seismic response factor decreases since the resonance period of tank is lengthened by nonlinear behaviors, for example uplifting of bottom plate (rocking behavior). In this paper, the reduction effect of response factor due to rocking behavior was quantitatively confirmed by 3-dimensional FEM nonlinear analysis and time-history nonlinear analysis that was modeled with single-degree-of-freedom spring-mass system. And a simplified evaluation method that allows easily calculating the reduction effect was proposed. As the result of study, it was proved that this method gave valid and conservative results.

scholarly journals A Formal Protocol to Conduct Usability Heuristic Evaluations in the Context of the Software Development Process

2018 ◽  
Vol 7 (2.28) ◽  
pp. 10 ◽  
Author(s):  
Freddy Paz ◽  
Freddy A. Paz ◽  
José Antonio Pow-Sang ◽  
César Collazos
Keyword(s):  
Software Development ◽  
Development Process ◽  
Evaluation Method ◽  
Evaluation Process ◽  
Usability Evaluation ◽  
Comprehensive Analysis ◽  
Heuristic Evaluation ◽  
Software Development Process ◽  
Software Products ◽  
Software Product

Heuristic evaluation is one of the most used techniques to evaluate the level of usability of a software product. In this research, we performed a comprehensive analysis of the recent studies which report the use of this method in the context of a software development process. The purpose was to identify the specific way in which each author performs this usability evaluation method, in order to propose a formal protocol. After an indeed examination of these studies, we have determined there are several differences in the way this technique is conducted according to the literature. There is no agreement about the number of inspectors that should participate, the usability principles that should be used, the profile of the specialists who must be part of the assessment team, or the evaluation process that should be followed. This work highlights the available settings and a detailed procedure to perform a heuristic evaluation in the domain of software products.  

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