Dynamic Analysis of FWD Test Results for Rigid Pavements

2008 ◽  
pp. 398-398-15 ◽  
Author(s):  
L Khazanovich
Keyword(s):  
Dynamic Analysis ◽  
Test Results ◽  
Rigid Pavements

Dynamic Analysis of Radioactive Material Package With Clamp-Ring Closure

2004 ◽  
Author(s):  
Tsu-te Wu ◽  
Lawrence F. Gelder ◽  
Allen C. Smith
Keyword(s):  
Dynamic Analysis ◽  
Safety Concern ◽  
Numerical Technique ◽  
Ring Closure ◽  
Foot Drop ◽  
Radioactive Material ◽  
Integration Scheme ◽  
Test Results ◽  
Numerical Integration Scheme ◽  
Drop Tests

Separation of the closure lid from the drum-type radioactive material packages employing the conventional clamp-ring closure has been a safety concern. Currently, the evaluation of drum-closure separation problems resorts to expensive and time-consuming tests. Therefore, an analytical capability to predict drum-closure separation is desired. However, the conventional methods of dynamic analysis are not applicable to this subject. The difficulty of the problem mainly lies in solving the complicated preload stresses on the multiple contacted surfaces during claim-ring tightening and in integrating the preload results with the subsequent drop simulation. A technique has been previously proposed by Wu for the dynamic analyses of containers with locking-ring closures (Reference 1). This paper presents a refinement of the proposed technique and also extends the technique from the dynamic simulation of one single drop to the simulation of two sequential drops. The finite-element method with explicit numerical integration scheme is utilized to simulate both the closure bolt tightening process and the drop impact. The essential aspects of the proposed technique include: quasi-static simulation of clamp-ring tightening process; association of the floor motion with the package motion before the drop simulation starts; and creation of the package velocity before impact starts. To verify the proposed numerical technique, an analysis is performed for the 6M Package with a standard clamp-ring closure to simulate the following three sequential loading conditions: the preload caused by tightening the clamp ring; a NCT 4-foot drop; and a HAC 30-foot drop. The analytical results are compared with the results of the sequential NCT and HAC drop tests of a 6M Package with the standard clamp-ring closure. The test results have verified that the proposed numerical technique is capable of predicting the drum closure separation with respect to drop heights as well as the deformed shape of the package.

scholarly journals Binder courses using cold recycled mixtures – a novel concept in cold recycling

2021 ◽  
Author(s):  
Bohdan Dołżycki ◽  
Andrea Grilli ◽  
Alex Balzi ◽  
Mariusz Jaczewski ◽  
Cezary Szydłowski
Keyword(s):  
Maintenance Planning ◽  
Test Results ◽  
Reclaimed Asphalt ◽  
Rigid Pavements ◽  
Laboratory Test Results ◽  
Binding Agents ◽  
Cold Recycling ◽  
Novel Concept ◽  
Mineral Mixtures ◽  
Technical Recommendations

Cold recycling with cement and bituminous emulsion is one of the most environmentally friendly techniques to maximize the reuse of reclaimed asphalt (RA) collected during demolition of roads. Cold recycled mixtures are commonly used for base courses in construction or rehabilitation of flexible and semi-rigid pavements. Current experiences demonstrated that cold recycling with appropriate requirements and technical recommendations allows long-lasting pavements to be designed. Those outcomes stimulated researchers and engineers in the new challenge of using the cold recycled mixtures in binder layers that are generally more often included in maintenance planning. This paper summarizes current San Marino and Polish experiences with cold recycled mixtures designed for binder layers. The first part of the paper presents the design phase of the cold recycled mixtures in both countries. It describes and compares the composition of the mixtures, grading curves of the mineral mixtures, binding agents and requirements. The second part of the paper shows laboratory test results of mechanical properties of cold recycled mixtures for binder courses including test results in full-scale application.

Applied Technology in Dynamics Study for Projecting Deployment of a New Anti-Riot Net

2014 ◽  
Vol 977 ◽  
pp. 425-430
Author(s):  
Yong Yuan Li ◽  
Lei Fang ◽  
Hong Bo Chen
Keyword(s):  
Rigid Body ◽  
Dynamic Analysis ◽  
Drag Coefficient ◽  
Rigid Bodies ◽  
Dynamic Equations ◽  
Test Results ◽  
Dynamics Modeling ◽  
Applied Technology ◽  
Simulation Results ◽  
Equivalent Method

In this paper, Dynamic analysis for the process of opening net is studied base on a new anti-riot device, focusing on the problem that dynamics modeling of fully compliant anti-riot net during the process, a new equivalent method is proposed. This method regards the anti-riot net as a variable drag coefficient rigid body, and regards four traction heads as a suppositional traction head, so the process of opening net can be transformed to the problem for movement of two rigid bodies, furthermore, the dynamic equations for the process of opening net was derived from this method. These equations are used to simulate the process of opening net; the simulation results are compared with test results to verify the practicability of the method.

Vibration Characteristic Prediction of a Heavy Machinery Suspension Seat Using Multi-Body Dynamic Analysis Method

2008 ◽  
Vol 33-37 ◽  
pp. 1259-1264
Author(s):  
W.C. Lee ◽  
Chae Sil Kim ◽  
H.O. Choi ◽  
Y.G. Jung ◽  
Jung I. Song
Keyword(s):  
Dynamic Analysis ◽  
The Other ◽  
Test Results ◽  
Analysis Method ◽  
Analysis Model ◽  
Heavy Machinery ◽  
Multibody Dynamic ◽  
Dynamic Simulation Model ◽  
Multi Body ◽  
Body Dynamic

This article proposes a novel simulation technique to predict the reasonable dynamic characteristics of a suspension seat for heavy machinery using a commercial multibody dynamic analysis code, ADAMS. The dynamic model is simulated with the specific condition such as sinusoidal and sweep input. The experiment test for actual suspension seat is conducted for reviewing the dynamic simulation model with same input condition. As the simulation results shows good agreements with experimental test results, the dynamic analysis model is reasonable and will be very helpful for predicting the dynamic characteristic for the suspension seat for heavy machinery and for designing the other type seats with the other suspension mechanism types.

Malware Behaviour Visualization

2014 ◽  
Vol 70 (5) ◽  
Author(s):  
Syed Zainudeen Mohd Shaid ◽  
Mohd Aizaini Maarof
Keyword(s):  
Dynamic Analysis ◽  
Visual Cues ◽  
New Technique ◽  
Malware Analysis ◽  
Test Results ◽  
Static And Dynamic Analysis ◽  
Manual Analysis ◽  
Detection And Identification ◽  
A New Technique ◽  
Visualization Techniques

The number of unique malware variants released each year is on the rise. Researchers may often need to use manual static and dynamic analysis to study new malware samples. Manual analysis of malware samples takes time. The more time taken to analyse a malware sample, the larger the damage that a malware can inflict. A lot of techniques have been devised by researchers to facilitate malware analysis and one of them is through malware visualization. Malware visualization is a field that focuses on representing malware features in the form of visual cues or images. This could be used to convey more information about a particular malware. Existing malware visualization techniques lack focus in visualizing malware behaviour in such a way that could enable better analysis of malware samples. In this paper, a new technique for malware visualization called ‘Malware Behaviour Image’ is presented. From the test results, the proposed technique is able to accurately capture and highlight malicious behaviour of malware samples, and can be used for malware analysis, detection and identification of malware variants.

Dynamic analysis of an open-loop proportional valve controlled hydrostatic drive

2019 ◽  
Vol 233 (6) ◽  
pp. 1245-1256 ◽  
Author(s):  
K Dasgupta ◽  
Sanjoy K Ghoshal ◽  
Sujit Kumar ◽  
J Das
Keyword(s):  
Dynamic Analysis ◽  
Flow Characteristics ◽  
Open Loop ◽  
Critical Parameters ◽  
Test Results ◽  
Proportional Valve ◽  
Detailed Model ◽  
Proposed Model ◽  
Graph Simulation ◽  
Drive Model

This article highlights the dynamic analysis of a proportional valve controlled hydrostatic drive. Such drives are used widely in construction and mining applications. In the drive considered for the analysis, the speed of a bent-axis hydro-motor is controlled by varying flow supplied through a proportional direction controlled valve. A non-linear mathematical model using bond graph simulation technique is developed, where detailed model of the drive system including its loading arrangement is incorporated. From the test results of the pressure-flow characteristics of the valves, its port resistances are identified. Using them and taking into account various losses of the hydro-motor, the drive model is validated through experiments. The verified model is used to study the effects of the perturbations of some critical parameters on the transient responses of the hydrostatic drive through simulation. The proposed model may be useful for initial design of such drive and the development of control systems where these drives are used as actuators.

scholarly journals Partial Replacement of Cement with Wood Ash & Fly Ash in Pavement Quality Concrete

2020 ◽  
Vol 9 (5) ◽  
pp. 1513-1515
Keyword(s):  
Fly Ash ◽  
High Strength ◽  
Wood Ash ◽  
Partial Replacement ◽  
Test Results ◽  
Split Tensile Strength ◽  
Conventional Concrete ◽  
Cement Production ◽  
Rigid Pavements ◽  
Emission Of Greenhouse Gases

Pavement Quality Concrete (PQC) is a special type of concrete which is used for construction of rigid pavements in dense traffic regions. In this type of PQC higher percentage of cement content is added when compared with conventional concrete, and it is mostly designed for high strength concrete M40 to M50 grade of concrete. Cement production leads to emission of greenhouse gases in vast amount, which made researchers to look for an substitute material to incorpotate with cement. The current experimental work is done to study the effect of wood ash and fly-ash mixed in concete as a partial replacement of cement. The replacement levels of wood ash and fly ash are taken equally as 10, 20 and 30% by weight of cement. In this mainly focused on Compressive strength and split tensile strength according to IS Codal provisions. Experimental test results revealed that the replacement of wood-ash and fly ash as a cementitious material in Pavement Quality Concrete will improve compressive and splittensile strength of concrete.

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