MATEC Web of Conferences

https://www.matec-conferences.org/

List of Papers (Total 7,301)

Full Scale Fatigue Test and Failure Analysis of Advanced Jet Trainer Wing

A verification method for the fatigue life of the jet trainer wing with integrated fuel tanks is presented. The test was performed to identify the critical points of the structure, to determine strain data and to proof fatigue life of the wing. During the test the non-destructive inspection methods for the identification and evaluation of the critical failures were employed; i.e...

Finite element modelling of air cavities effect on GnP/epoxy nanocomposite thermal response and its full-field validation

The manufacturing process of GnP/polymer nanocomposites exhibits important challenges regarding the material quality and how to reduce or eliminate fabrication induced defects. In this work, the effect of air cavities (voids) on the thermal response of nanocomposites is studied by means of finite element analysis on a multi-scale scheme. The proposed model is validated with...

Development and application of methods to characterize micro semi-finished products and micro components

In the production of semi-finished products for the production of microcomponents and the components themselves, the characterization of their physical properties is of particular importance. Due to the often oligocrystalline character of these semi-finished products and components, it is necessary to use a suitable testing technique for static and dynamic investigations, as the...

Structural, optical and electrical characterizations of ZnO/PS

This work reported on solar cell ZnO/PS heterojunction fabricated from Zinc nitrate with molar concentrations 0.05M and 0.2M using spray pyrolysis technique, to study the effect of high and low molar concentration of Zn precursor on structural, optical and electrical properties. The structural analyse showed that the obtained thin films deposited on glass substrate were...

Thermal performance in a tubular heat exchanger with deltawinglets

The paper presents an experimental heat transfer enhancement study in a tubular heat exchanger fitted with delta-winglets. The experimental work was conducted by varying the airflow rate in the test tube having a constant wall heat-flux for turbulent regime, Reynolds number (Re) from 5200 to 23,000. Effects of three pitch ratios (PR=P/D=1.5, 2.0 and 3.0) and two attack angles...

Construction planning of low-rise residential property based on improving mobility of construction operations

Article discusses the possibility of implementing new modern tools and methods of construction operations. It esteems the main features of the scientific construction planning when building low-rise residential property and analyzing complex economic situations of companies operating under mobility conditions. It concludes that the choice of modern ways of construction planning...

Bamboo - the eco-friendly material – one of the material solutions of the sustainable interior design in Viet Nam

Today, sustainable architecture is not just a trend but an architectural style that has become a "revolution.

Dynamics of dry spots in the liquid film moved by the gas flow in the mini-channel under intensive local heating

Experimental studies of hydrodynamics and the heat transfer crisis were carried out for a two-phase stratified flow in a mini-channel with intensive heating from a heat source of 1x1 cm2. It has been established that as the heat flow increases, the total area of dry spots on the heater increases, but when a certain temperature of the heater surface reaches ≈100 °C, the area of...

Icing control model and algorithm for wasteheat exchangers of ventilation systems

Currently, ice control on various heat exchangers to be used for waste heat recovery of discharge air is a rather topical subject because ice building is a factor to reduce efficiency of heat recovery. In such systems, icing always takes place on the side of humid discharge air, with a background of heat exchange between inlet air at temperatures of -30°C and below, and discharge...

User cost estimation on flexible and rigid pavement

The unsatisfactory condition of Indonesia’s local roads needs to be improved to support the national transportation network. However, construction activities to improve it often have negative impacts, among other: an increase of user cost. This article aims to calculate user cost generated by flexible and rigid pavement construction. This study was carried out on a local road in...

Ground anchors corrosion - the beginning of the end

Ground anchor corrosion is a common problem for anchored slopes in Taiwan. It is partly due to the humid climate condition and abundant groundwater in the slope and partly due to poor corrosion protection of anchor design and construction. In 2010, an anchored slope at Taiwan National Freeway No. 3 failed suddenly after 13 years of service. It buried 3 cars and killed 4 people...

Evaluation of bond strength between normal concrete and high performance fiber reinforced concrete (HPFRC)

High Performance Fiber Reinforced Concrete (HPFRC) has been proposed to be used as a repair material for the deterioration of concrete structure since its very low porosity that leads to a low permeability and high durability. This characteristic makes it suitable for rehabilitation and retrofitting reinforced concrete structures or for as a new repair material. The bond strength...

A model of two-velocity particles filtration with variable injection

The filtration problems are actual in the design of underground storage facilities for hazardous waste. When the grout is injected into the porous soil, the fluid penetrates deep into the rock and, when solidified, blocks the pores. A model of suspension flow with 2-size particles moving with different velocities in a porous medium is considered. The proposed model of deep bed...

Assessment of sandy soil water permeability methods

Qualitative assessment of soil permeability is important for designing drainage systems and waterworks. According to the research results, soil permeability factor depends on sample preparation, test method and conditions.The article summarizes the results of analyzing the factors that influence the permeability of sandy soils: filtration conditions (steady-state and non-steady...

Application of digital image correlation system for analysis of local plastic instabilities of perforated thin-walled bars

In the presented paper the local instabilities occurring in compression test of perforated thin-walled bars of low slenderness are observed using digital image correlation system ARAMIS. The tested samples slenderness is so low, that from theoretical point of view we are dealing with compression tests of some perforated shells. The samples are made from typical low carbon steel...

Parameters identification BLDC motor: Instrumentations and transfer functions

One of the steps that must be taken in optimizing the speed control of the Brushless DC motor (BLDC) Motor is to mathematically model. The purpose of this research is to get the mathematical modeling of BLDC motor with 350 watts of power in the form of transfer function. The method used to obtain the transfer function is to identify the input and output data. The identification...

Investigation on the improvement of car air conditioning system performance using an ejector

The purpose of this research is to know the improvement of car air conditioner system performance using an ejector. The study was conducted on a car engine with power 100 PS (74 kW) @ 5000 rpm. The test procedure is carried out under two conditions: the normal refrigeration cycle mode and the refrigeration cycle mode with the ejector. The working fluid used in the refrigeration...

Analysis of flame stabilization limit in a cylindrical of step micro-combustor with different material through the numerical simulation

The flame stabilization limit on micro-combustor had studied to support the micro power generator system. Micro-combustion became the crucial components in a micro power generation system as heat resource that will be converted into electricity. However, the unstable flame in micro-combustor became the main problem that faced by researchers, especially the excess of heat losses...

Tumour necrosis factor-alpha level among travellers contracted with dengue virus in Bali

Dengue infection burden has been predicted increase three times greater recently. Severe dengue infection associated with the high generation of inflammatory cytokines leads to vascular endothelial instability. Hence, the current study aim to evaluate the level of TNF-α among travellers infected with DENV in Bali. An observational prospective study has been conducted on...

Optimization temperature in the room using air conditioner with finite element methods

Room temperature is one of the problems in everyday life that is often discussed. One of the tools in regulating the temperature is Air Conditioner (AC). As is known, that the AC work process in cooling the room is the process of heat transfer. This study aims to find out how the AC works in regulating the temperature in a room. In the process, this research is accomplished by...

Application of a Hybrid Method for Power System Frequency Estimation with a 0.2-second Sampled Period

The signal processing technique is one of the principal tools for diagnosing power quality (PQ) issues in electrical power systems. The Discrete Fourier Transform (DFT) is a frequency analysis technique used to process power system signals and identify PQ problems. However, the DFT algorithm may lead to spectral leakage and picket-fence effect problems for asynchronously sampled...

Use of Recycled Tyre Rubber in Non-structural Concrete

To manage tyre waste and conserve natural aggregate resource, this research investigates the use of waste tyre rubber as partial replacement of fine aggregates in non-structural concrete. The research used Taguchi method to study the influence of mix proportion, water-to-cement ratio and tyre rubber replacement percentage on concrete. Nine mixes were prepared with mix proportion...

Establishment of Shoreline Buffer Zone through Rehabilitation of Degraded Coastal Mangroves

After the 2004 tragic tsunami that struck the western coastlines of Peninsular Malaysia and several Asian countries, which claimed thousands of lives and inflicted substantial damage to properties and economy of affected areas, the Malaysian government established a task force namely “Special National Task Force on Planting of Mangrove and Other Suitable Species in Coastal Areas...

Performance of broadband tristable energy harvesters

We analyze dynamical responses of energy harvesters with a mechanical resonator possessing three potential wells. The frequency spectral analysis of simulated systems demonstrates that additional sub-harmonic and super-harmonic resonances appear. These additional solutions make the frequency broadband effect and effectively increase the voltage output. We show the characteristic...

Tip-timing analysis of last stage steam turbine mistuned bladed disc during run-down

This paper presents the experimental and numerical studies of last stage LP mistuned steam turbine bladed discs during run-down. The natural frequencies and mode shapes of the turbine bladed disc were calculated using an FE model. The influence of shaft was considered. The tip-timing method was used to find the mistuned bladed disc modes and frequencies. The numerical results...