bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ambient suppression in vibration bump test using wavelet-based filter
Authors: Nizwan C K E , Ghazali M F , Yusof A R 
Published: June 2020

Abstract
Modal analysis is generally used to determine the structural dynamic characteristics of a system through experimental. The main purpose of a modal analysis is to identify the modal parameter, which consists of natural or resonant frequencies, mode shapes and damping. However, this technique required all the system in shut down condition in order to perform modal testing. The presence of ambient force such as motor unbalanced can cause errors in measurement of time response. Therefore, a study on how to improve the quality of the acquired signals in EMA is crucial in order to increase the efficiency of EMA technique under the presence of ambient force. This paper introduces a method to eliminate the ambient component in measured vibration response using the wavelet-based filter. The two experiments have been carried involving two different conditions, shutdown condition and operating condition. The sources of the ambient in operating condition are induced from a motor and speed controller cooling fan. The proposed method utilizes the discrete wavelet transform (DWT) and improvised spectral subtraction in filtering the ambient. The discrete wavelet transform (DWT) is applied to both ambient data and total response data to decompose the signal by a factor of two into several levels of the wavelet decomposition. The modification of the discrete wavelet transform (DWT) method has been done where the wavelet thresholding is replaced with the spectral subtraction to suppress the ambient in the signal. The spectral subtraction is used to suppress the ambient in each wavelet coefficient at each level of decomposition to avoid the losses of useful signal data while filtering the ambient. The decomposed wavelet signal is reconstructed and the result is being compared with the baseline data. The Frequency Response Function obtained from the reconstructed signal shows the harmonics feature from ambient excitation were successfully suppressed. The results show that the proposed approach is effective to suppress the ambient effect in vibration response measurement.
Remaining life prediction of wind turbine bearing based on Wiener process
Authors: Song Mu , Youliang Su , Kai Jing , Cheng Li , Tao Wang 
Published: June 2020

Abstract
In order to know about the real-time operating condition and the remaining life of the wind turbine bearings in time, a method of life prediction was proposed based on Wiener process. Firstly, the relationship model of bearing temperature parameters and speed parameters of wind turbine was established by using multiple linear regression; Secondly, the established relationship model was been used to build the real-time monitoring and performance degradation model of the wind generator bearings; Thirdly, Linear Wiener process and nonlinear Wiener process were respectively used to establish the remaining life prediction model of wind turbine bearing; Finally, the feasibility and effectiveness of the method in practical application were verified by analyzing the temperature data of a wind turbine’s gearbox.
The influence of wavy vortex in reducing the wall shear stress
Authors: Razzak A , Akter S , Hannan M A 
Published: June 2020

Abstract
A numerical study is preformed to demonstrate the influence of wavy vortex in reducing the wall shear stress for Taylor Couette flow (viscous flow in the annuals gap between two concentrated cylinders). The study replicates an experimental investigation performed for Taylor Couette flow with radius ration of 0.892. LES of WALE model is used to solve the 3D Navier-Stokes equation in OpenFOAM. Simulation was carried out for a range of Reynold’s Number (Re); and normalized torque, wall shear and velocity are compared for various flow structure. It is found that the azimuthal wall shear near the mid region drops significantly due to the appearance of wavy vortex flow. This finding may play a significant role in the study of drag reduction and can be practically applied in various fluid structure interaction systems involving rotational parts to improve frictional efficiency.
Effects of varying ultrasound parameters on the oscillation of a microbubble near a boundary
Authors: Mohd Ali Najihah , Dzaharudin Fatimah , Alias Erny 
Published: June 2020

Abstract
Microbubbles are currently used as ultrasound contrast agents. However, microbubbles have the potential to be used in diagnostic imaging and therapeutic applications. Most numerical work on simulating microbubble oscillation involves modelling microbubbles in infinite medium whereas clinical trials and experiments involve microbubbles near a boundary such as an endothelium and blood vessels. This study will extend previous research by investigating the effects of varying the ultrasound parameters on a microbubble near a boundary. The microbubble oscillation was found to become increasingly irregular as the driving pressure amplitude is increased. The maximum amplitude of oscillation was found to decrease with increasing ultrasound frequency.
Green roofs – modern solutions for greening buildings
Authors: Baciu I R , Taranu N , Isopescu D N , Lupu M L , Dragan T C , Maxineasa S G 
Published: June 2020

Abstract
In a society intensively urbanized, nature and green spaces have an extremely important and determined role. Solutions that are integrating different modern techniques related to a new or an existing building, with a tremendously positive effect over the natural building and horticultural sectors will represent an important factor in reducing the negative effect over the environment on a global scale. These smart solutions could extend the garden effect from the ground to the elevated levels of the building. Even if at the present moment there are different classic solutions to realize a green roof, in the last decades, have been developed different new and modern techniques for the greening environment. Taking into account all the above mentioned, the aim of the paper is to present the modern green roof systems considering all the changes that have occurred over time, and also to analyze a series of examples of how this concept has been adopted in different parts of the world and for varies structural systems. The authors consider that the study is very important in order to completely understand the characteristics of these systems and their main components, in order to properly design and implement them according to the present environmental needs. It is believed that the knowledge of this concept and its evolution and tendencies will help solve a series of ecological and social problems.
Current tendencies in welding of steel bridges; choice of material and use of thick plates
Authors: Băncilă R , Petzek E , Feier A , Radu D 
Published: June 2020

Abstract
The emergence of new efficient materials, the high demands on the quality of the welded joints, while ensuring their safety in operation, outstanding aesthetic forms, the complexity of the new European welding standards, the pressure of the short execution times, had as result the adoption of modern solutions for steel and composite bridges. Durability is also one of the demands of the European Standards. The use of thick heavy plates can lead to reduction of the constructive depth, possibility for improved fatigue details, short execution time and easy maintenance. In this direction the fabrication efficiency is important, the need of a correct technology is vital. The role of the welding specialist is determinant. The paper presents some examples in the realization of modern steel and composite bridges with thick plates for the Romanian highways network.
Testing methods for the assessment of material properties in historical masonry structures: a review
Authors: Barnaure M , Cincu M 
Published: June 2020

Abstract
The current state of testing methods for assessing the mechanical properties of old masonry buildings is reviewed, with a focus on the methods adapted for heritage structures. For these buildings, an accurate assessment is needed in order to minimise the interventions extent while ensuring an adequate structural safety level. As old masonries are non-homogenous and exhibit a highly anisotropic behaviour, numerous parameters are required for correctly simulating the behaviour under a given load scenario. In earthquake-prone areas, numerous failure patterns, in-plane and out-of-plane, can occur for the structural walls, each of them depending on different characteristics of the material. If for new masonries the testing procedures are standardised, for old buildings less standardised tests exist, while investigations are often based on modified or empiric methods. The testing methods can be classified as destructive, minor destructive and non-destructive. The destructive methods are the most precise but are extremely intrusive and may not be acceptable for heritage listed buildings. The non-destructive methods mostly provide qualitative results. The minor-destructive tests are often the most adapted for the study of historical buildings, as they can provide relevant information while affecting only in a limited extent the existing elements.
Structural design of residential buildings according to Eurocode
Authors: Bešević M , Purcar M V , Kozarić L , Zivković S 
Published: June 2020

Abstract
In this paper, the dimensioning of the load-bearing structures A, B and C of building complex in the surroundings of Salzburg, Austria is given. The floors of object A are underground floor, ground floor and two floors, and for objects B and C it is underground floor, ground floor, first floor and the attic. These buildings have an underground shared garage. The foundation is 30 cm thick reinforced concrete slab, with capitals 200/200 cm, thickness dpp = 20 cm that are constructed in the middle part of the garage under the columns. Other underground parts of the buildings are the basements of each individual building. In addition to the common garage, the buildings have a common part of the ground floor, which connects the separate buildings. The construction of the garage at ground level is in the form of reinforced concrete slab with thickness dp = 35 cm with reinforcement-capitals under the columns with thickness dkpl. = 20 cm. The foundation and the ground floor slab are separated by an expansion joint in the axis 7. The waterproofing of the ground floor slab is achieved uniquely for the whole slab of the complex. Special attention is paid to the thermal calculation.
Coordination of construction manipulation robotic system using UAV
Authors: Bulgakov A G , Pakhomova E G 
Published: June 2020

Abstract
Drone technology has demonstrated to be of great contribution to the construction field. Tasks such as photogrammetry, plot surveillance and assets inspections are successfully automated with the aerial robotic technology with some level of contribution of a human operator. In this paper we analyse the possibility to achieve fully automated construction task using dispersed robotic system: a drone and mobile robotic crane. The role of the drone is to study the surroundings and generate a desired trajectory for the crane boom arm in order to lay-in pergola blades. The paper focuses on the layers of the dispersed cyber-physical system allowing to achieve such complex task and optimize the trajectory of the crane boom arm by resolving two-dimensional Chebyshev-Gauss collocation method in order to have minimum-jerk path.
Accessibility to Transylvania´s cultural heritage through BIM-Heritage and community involvement
Authors: Chițonu G C , Rolfsen C N , Deaconu O 
Published: June 2020

Abstract
The rural areas of Transylvania offer important resources for developing research in diversity of the cultural heritage. Many of these communities have seen great changes in demographics over the last 30-50 years, and important cultural heritage from previous generations is being lost in lack of understanding, human resources and willingness to preserve the value of our joint cultural heritage. The research seeks a digitisation approach to preserving and promoting the local cultural heritage, as well as a social science approach, which seeks to find answers to how one can be able to preserve, maintain and promote this cultural heritage, something which, according to the study hypothesis, can only be done if the communities see the benefits of doing so. The digital shift has the ability to create another level of understanding, opening a vast horizon for accessibility and progress linked with BIM technology. As an answer to dealing with the climate changes, degradation of the buildings due to natural disasters or more from the indifference of the young generations in regard of history inheritance, the study could be a valuable instrument in enhancing BIM-Heritage methodologies.
Applying the mathematical optimization model in water distribution management
Authors: Cojanu V , Helerea E 
Published: June 2020

Abstract
This paper aims to analyse the concept of water distribution system management and the modalities of including the optimization tools for increasing the process efficiency. Water distribution systems are often unable to respond quickly and efficiently to consumers demands. Water is a non-renewable resource and should therefore be treated with special interest. Sustainable development and optimization are the steps to take. A mathematical optimization model is presented in the second part of the paper with explanations regarding the steps followed. The result demonstrates the efficiency, speed and accessibility of using graphical-analytical optimization methods in the field of water distribution system.
Masonry strength influence on the buildings’ performance
Authors: Constantinescu S 
Published: June 2020

AbstractThis paper studied the behaviour of a medium height, confined masonry walls building, in a medium seismic area (0.25g, wheregis the gravity acceleration), in Iasi, Romania. The study focuses on different masonry strengths impact on the building’s elastic and plastic behaviour. It is important to establish if the structure can bare the gravitational and seismic loads if weaker bricks are used and also how the plastic mechanism is formed if the walls are made of stronger and stiffer masonry. It is also highlighted how the beams stiffness affects the structure ductility and how it can be improved. The building does not have the same stiffness on bothXandYdirections, so this will also be taken into account.
Planning risk management in case of a drinkable water tank facility operation
Authors: Covatariu G , Covatariu D , Filip A 
Published: June 2020

Abstract
The continued assurance of the needs of drinking water and the proper quality is vital for ensuring good living conditions. As a result of this idea, the risk analysis of the technological process of providing drinking water in the case of water tanks and the creation of a risk management plan and its permanent pursuit can lead to a more efficient process. Water tanks are high importance facilities for communities and during their lifecycle, there are a lot of uncertainties that can occur and affect it. In order to have an efficient and correct facility management during the functioning period, performing a risk analysis of these events is mandatory for this kind of constructions. Creating a good risk management plan and keep following it during the objective lifetime keeps the qualitative indicators of the water into planned parameters and the low costs.
Improvement of the concrete behaviour to sulphate corrosion using fly ash admixture collected by wet process
Authors: Diaconu L I , Rujanu M , Diaconu A C , Șerbănoiu A A , Babor D T , Plian D 
Published: June 2020

Abstract
For the concretes subjected to sulphate corrosion the use of the H II/A-S cement type is recommended. To improve the behaviour of these concretes to aggressive sulphate and magnesia corrosion, the use of the fly ash admixture collected by wet process for replacing the fine part of the aggregate is proposed. Because this type of corrosion is manifesting by expansion the analysis was conducted by measuring the dimensional modifications. In the Laboratory of the Faculty of Civil Engineering and Building Services of Iasi, an experimental program was conducted in order to assess the dimensional modification of the some samples prepared by concrete mixes based on belitic cements of type H II/A-S and embedding fly ash subjected to a combined sulphate and magnesia corrosion process using a mixed solution of Na2SO4 and MgSO4 having certain concentrations. The prismatic concrete samples were preserved in distilled water and in the combined solution, and then after 28 and 90 days their dimensions were measured by the Graff device. In this paper is presented the behaviour of the concretes in the first life time and, as further research other samples will be tested for longer time.
Considerations on the use of ultra-high performance concrete for water tanks
Authors: Grigorean A , Diaconu L I , Tamas F L 
Published: June 2020

Abstract
The development of ultra-high strength and high performance concrete is a relatively new field in the profile industry. The last 150 years have shown that, despite getting more and more resistance, the practical applications have been too many times due to innovations in materials science. This phenomenon seems to be caused by the increased costs per unit of volume, as resistance increases, as well as a cautious retention of using new materials in practical applications. The present study aims to be an encouragement of practical structural applications by presenting an Ultra High Performance Concrete (UHPC), developed with locally available materials. As it is known, concrete is the main building material worldwide. In the last decades, his leadership position has been strengthened by the constant concern of the researchers and by obtaining the various types of concrete with increasing performances from the point of view of the fresh and hardened state, obtaining special structural applications.
Characteristics of buildings and seismic vulnerability assessment for the specific area of the city of Osijek
Authors: Hadzima-Nyarko M , Pavić G , Bulajić B , Kukaras D 
Published: June 2020

Abstract
Seismic risk is a measure of the damage that is expected in a specific area and time interval. It is based on the level of seismicity of locations (hazard), the resistance of buildings (vulnerability), and the type, quality and quantity of exposed assets (exposure). It can be measured by the expected economic loss, loss of life or damage to property size. Reducing the seismic risk comprises three phases: assessment, planning and implementation. The risk assessment requires a multidisciplinary approach that takes into account the expected physical damage (damage to buildings and economic losses), as well as social, organizational and institutional factors. At the city level, a risk assessment should start assessing the physical damage as a result of basic tools and the link between risk and vulnerability values of buildings. In this paper the creation of a database of existing buildings, classification of buildings and a procedure for determining the building typology that prevail in the city of Osijek is described. Based on the formed database, it is possible to implement certain seismic vulnerability methods.
Study on the adsorption and purification performance of runner with different staged regeneration modes
Authors: Hao H , Song X Y , Xin P 
Published: June 2020

Abstract
In this paper, the hierarchical regeneration mode of three-zone, four-zone and two-stage regeneration of the wheel is firstly determined. Silica gel is selected as the adsorbent, and toluene is selected as the VOC pollutant. Visual Basic software is used to establish the coupling adsorption model of heat, humidity and VOC pollutants in the staged-regeneration wheel. The dehumidification and VOC adsorption performance of the graded regenerated wheel with different influencing factors were compared, and the variation rules of the dehumidification and toluene adsorption concentration of the staged-regeneration wheel with different influencing factors were analyzed. The results show that, when the regeneration energy consumption of the runner is the same, the dehumidification capacity of the two-stage runner is the highest, the concentration of toluene adsorbed by the three-zone runner is the highest, and the dehumidification capacity and the concentration of pollutants adsorbed by the two-zone runner are the lowest. When the capacity of dehumidification is the same, the regeneration energy consumption of two-stage runner is the lowest, and the regeneration energy consumption of two-zone runner is the highest. With the increase of adsorption capacity, the lower the regeneration temperature is, the more significant the energy saving effect will be. When the capacity of dehumidification is the same, the concentration of pollutants adsorbed by the runner in the three regions is the highest. In addition, with the increase of air entrance temperature and humidity, the dehumidification capacity of the two-stage runner changes the most, and the adsorption concentration of toluene of the two-stage runner changes the most. When the concentration of toluene in the treatment zone was different, it had no effect on the dehumidification effect of the runner, and the concentration of toluene adsorbed by the runner in the third zone changed the most.
Establishing workability asphalt mixtures
Authors: Iriciuc S C , Gălușcă N I , Pleșcan C 
Published: June 2020

Abstract
The article shows the need to improve repair technologies for bituminous pavements especially during the cold season. As a result of laboratory tests, it was found the need for other attempts. These are attempts on storable asphalt mixtures workability at various temperatures for the installation period, but also for the storage period. Through the laboratory tests was shown the complex interaction between mechanical behaviour of asphalt mixtures and variability factors acting on the road structure, this complex framework is determined by fundamental mechanical properties that influence long-term performance.
Analysis of influence of subway station deep foundation pit excavation on adjacent bridge piles
Authors: Li B , Sun W , Li G K 
Published: June 2020

Abstract
Based on the engineering background of the deep foundation pit construction of Shenyang metro Line 10, the numerical simulation software Midas the GTS NX, and the three-dimensional integral calculation model considering the interaction of foundation pit supporting structure, surrounding soil and viaduct is established, and the numerical simulation value and the measured data are compared and analyzed, the applicability of the model is verified, the influence of foundation pit excavation on the deformation of pile foundation is studied, and the optimization scheme is given. The construction plan of Simulation + forecast is established to guide the practical construction of the project. The results show that when the depth of the pile foundation is 1.5 times the depth of the foundation pit, and the horizontal displacement of the pile foundation is within 1/2 of the control value, this is the optimal depth of the pile foundation. This is the minimum standard safe distance when the pier is 1/2 from the depth of the foundation pit.