scholarly journals Acoustic Assessment of a Precast Factory in Kolkata, India

2017 ◽  
Vol 7 (4) ◽  
pp. 142
Author(s):  
Rohan S. Wilkho ◽  
Himadri Guha
Keyword(s):  
Construction Industry ◽  
Simulation Models ◽  
Acoustic Properties ◽  
Limit Set ◽  
Loud Noise ◽  
Noise Levels ◽  
3D Simulation Model ◽  
Infrastructure Project ◽  
Lower Noise

Sustainable development has various indicators like transport system, economy, land use etc. Quality of life is one of them and protection from noise, especially at workplace plays a prime role in determining it.Numerous literature surveys have revealed that the construction industry ranks second in terms of thestaff being exposed to loud noise and its consequent hazards. A similar situation was observed in a major infrastructure project in Kolkata, India. A questionnaire survey among the workers and a 3D simulation model was created to assess the noise levels. The results revealed that the perceived noise levels were significantly high and exceeded the limits set by concerned authorities. This warranted actions to reduce noise levels. To achieve this, two alternate simulation models were created with altered acoustic properties. The results of these simulations reduced noise to identical levels, which were lower than the limit set. And hence, it was concluded that lower noise levels could not be achieved and was proposed that adopting either of the two would fit the purpose.

scholarly journals Guidelines to Calibrate a Multi-Residential Building Simulation Model Addressing Overheating Evaluation and Residents’ Influence

Buildings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 242
Author(s):  
Christoph Schünemann ◽  
David Schiela ◽  
Regine Ortlepp
Keyword(s):  
Simulation Model ◽  
Time Window ◽  
Residential Building ◽  
Simulation Models ◽  
Building Simulation ◽  
Night Time ◽  
Building Performance Simulation ◽  
Starting Point ◽  
3D Simulation Model ◽  
Building Physics

Can building performance simulation reproduce measured summertime indoor conditions of a multi-residential building in good conformity? This question is answered by calibrating simulated to monitored room temperatures of several rooms of a multi-residential building for an entire summer in two process steps. First, we did a calibration for several days without the residents being present to validate the building physics of the 3D simulation model. Second, the simulations were calibrated for the entire summer period, including the residents’ impact on evolving room temperature and overheating. As a result, a high degree of conformity between simulation and measurement could be achieved for all monitored rooms. The credibility of our results was secured by a detailed sensitivity analysis under varying meteorological conditions, shading situations, and window ventilation or room use in the simulation model. For top floor dwellings, a high overheating intensity was evoked by a combination of insufficient use of night-time window ventilation and non-heat-adapted residential behavior in combination with high solar gains and low heat storage capacities. Finally, the overall findings were merged into a process guideline to describe how a step-by-step calibration of residential building simulation models can be done. This guideline is intended to be a starting point for future discussions about the validity of the simplified boundary conditions which are often used in present-day standard overheating assessment.

Non-Destructive Identification of Defects in Power Support Structure Foundations by Means of Acoustic Techniques

2014 ◽  
Vol 606 ◽  
pp. 95-98
Author(s):  
Lukasz Sadowski
Keyword(s):  
Construction Industry ◽  
Support Structure ◽  
Air Voids ◽  
Impact Echo ◽  
Acoustic Techniques ◽  
Location Depth ◽  
Concrete Elements ◽  
Non Destructive ◽  
Made In

Prefabricated power support structure foundations are made in prefabrication plants where concrete is laid in layers in moulds. The quality of the prefabricated units depends mainly on proper concrete mixture compaction, which is usually effected by means of immersion vibrators. It happens that when the vibrator is withdrawn too quickly, defects, in the form of, e.g., air voids and zones of insufficiently vibrated concrete, appear. Modern non-destructive acoustic techniques, which in recent years have been increasingly commonly used in the construction industry, are highly suitable for testing concrete elements, particularly prefabricated concrete units. The non-destructive impact-echo technique is particularly useful for determining defect location depth and for locating defective areas.

On the Field Evaporation Behavior of a Model Ni-Al-Cr Superalloy Studied by Picosecond Pulsed-Laser Atom-Probe Tomography

2008 ◽  
Vol 14 (6) ◽  
pp. 571-580 ◽  
Author(s):  
Yang Zhou ◽  
Christopher Booth-Morrison ◽  
David N. Seidman
Keyword(s):  
Atom Probe Tomography ◽  
Mass Spectra ◽  
Pulsed Laser ◽  
Picosecond Laser ◽  
Atom Probe ◽  
Resolving Power ◽  
Noise Levels ◽  
Thermally Activated ◽  
Mass Resolving Power

AbstractThe effects of varying the pulse energy of a picosecond laser used in the pulsed-laser atom-probe (PLAP) tomography of an as-quenched Ni-6.5 Al-9.5 Cr at.% alloy are assessed based on the quality of the mass spectra and the compositional accuracy of the technique. Compared to pulsed-voltage atom-probe tomography, PLAP tomography improves mass resolving power, decreases noise levels, and improves compositional accuracy. Experimental evidence suggests that Ni2+, Al2+, and Cr2+ ions are formed primarily by a thermally activated evaporation process, and not by post-ionization of the ions in the 1+ charge state. An analysis of the detected noise levels reveals that for properly chosen instrument parameters, there is no significant steady-state heating of the Ni-6.5 Al-9.5 Cr at.% tips during PLAP tomography.

scholarly journals A New Approach to Assess the Quality of Small High-Speed Centrifugal Fans Using Noise Measurement

1999 ◽  
Vol 5 (2) ◽  
pp. 147-153 ◽  
Author(s):  
Dingjun Cui ◽  
Ian A. Craighead
Keyword(s):  
Signal Processing ◽  
Quality Assessment ◽  
Condition Monitoring ◽  
High Speed ◽  
Noise Levels ◽  
New Approach ◽  
Commercial Market ◽  
Centrifugal Fans ◽  
Special Approach

The requirements for a special approach for the quality assessment of small high-speed centrifugal fans are outlined and a new parameter designating the noise levels from the product in comprehensive form will be discussed and described as a criterion for such quality assessment.By applying techniques of signal processing and condition monitoring, the sources of the vibration and noise in different sections of the product can be identified, then the noise from each source from different components can be determined. Using this criterion, more aspects of the quality of the products can be assessed and suggestions to improve the quality of the products can be made. Finally, the assessment of a number ofvacuum cleaner motor/fan units available in the commercial market will be presented and compared with conventional specifications. It will be shown that the new parameter provides a more useful indication of appliance quality.

Quality of Design Documentation in the Construction Industry: A Review Using Meta-Synthesis Approach

2021 ◽  
Vol 18 (06) ◽  
Author(s):  
Peter Dodzi Kwasi Agbaxode ◽  
Sitsabo Dlamini ◽  
Ehsan Saghatforoush
Keyword(s):  
Construction Industry ◽  
Influencing Factors ◽  
Construction Projects ◽  
Poor Quality ◽  
Improve Design ◽  
Documentation Quality ◽  
Design Documentation ◽  
Quality Design ◽  
Synthesis Approach

A meta-synthesis approach was used to identify, synthesize, and categorize appropriately factors in the literature that contribute to design documentation quality. The categories include factors on quality attributes, quality indicators, and quality-influencing factors. Findings indicate that the quality of design documentation in practice is unsatisfactory, therefore, there is a need for collaboration between the owner, designers, and end-users to improve design documentation quality. The results offer pragmatic data on design documentation quality in the construction industry between the years 1992 and 2019. However, further research on the significant impacts of poor-quality design documentation on construction projects is recommended.

Implementation of Digital Technologies Into the Educational Process

2021 ◽  
Vol 15 ◽  
pp. 385-391
Author(s):  
Eva Panulinova ◽  
Slavka Harabinova ◽  
Renata Baskova
Keyword(s):  
Quality Of Life ◽  
Construction Industry ◽  
Social Life ◽  
Civil Engineering ◽  
Digital Technologies ◽  
Educational Process ◽  
Skills Development ◽  
Direct Impact ◽  
Planning Implementation

Revolutionary changes in society are linked to digital technologies and affect all areas of social life, not excluding construction industry. This requires not only knowledge reform, but above all skills reform. The current demand of practice is to increase the knowledge and competences of graduates of civil engineering faculties in the field of introduction and use of digital technologies in the process of planning, implementation, and maintenance of buildings, as well as to support the skills development of civil engineers in teamwork while using BIM technologies. The presented, currently implemented project contributes to meeting the above-described Practice Needs. The expected direct impact of the project is to increase the competitiveness, employability, and quality of life of graduates entering practice.

Approaches to Urban Noise Management in India

2012 ◽  
Author(s):  
Neelima S. Naik
Keyword(s):  
Urban Areas ◽  
Central Government ◽  
Environmental Concern ◽  
Noise Pollution ◽  
Noise Levels ◽  
Urban Noise ◽  
Master Plans ◽  
The Past ◽  
Metropolitan Cities

Noise pollution in urban areas is recognized as a major environmental concern in India. The lack of infrastructure and fast paced life in major metropolitan cities of India has made the urban environment extremely crowded, busy as well as noisy and as a result the millions of people living in the major metropolitan areas are suffering from the impacts of noise pollution. Noise levels are escalating at such a rate that it has become a major threat to the quality of human lives. Direct links between noise and health have been established by research conducted over the past few decades. There are several causes for urban degradation such as population migration, environmental considerations not adequately being incorporated into master plans, uncoordinated and haphazard development, weak implementation of plans and laws and inadequate institutional competences and resource crunch. This paper discusses the causal factors, impacts and the different approaches adopted by the Central Government as well as some major State Pollution Control Boards to curb the urban noise problem and the need for looking into non-conventional solutions such as Ecocity programme to bring in visible environmental improvement.

scholarly journals Overshooting Americanisation. Accent Stylisation in Pop Singing – Acoustic Properties of the Bath and Trap Vowels in Focus

2017 ◽  
Vol 15 (4) ◽  
pp. 371-384 ◽  
Author(s):  
Monika Konert-Panek
Keyword(s):  
Acoustic Properties ◽  
Phonetic Features

The paper addresses the problem of overshoot involved in singing accent stylisation. Selected phonetic features indexed as “American” and “Cockney” are analysed in the singing and speaking styles of a British vocalist, Adele. Overshoot, understood as a greater frequency or an exaggerated quality of a given feature, is characteristic of staged performance (Bell and Gibson 2011; Coupland 2007). PRAAT is used to establish the acoustic properties (F1 and F2) of the BATH and TRAP vowels, as well as the presence or absence of the BATH-TRAP split. The results show that Americanisation regarding the BATH-TRAP split in singing is present and the Americanised vowel tokens are “overshot”, having higher F2 frequency compared with the regular British TRAP vowel.

scholarly journals Discussion on the Application of New Photovoltaic Energy in Building Electrical Energy Saving

2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Qian Yang
Keyword(s):  
Energy Conservation ◽  
Construction Industry ◽  
Construction Projects ◽  
Negative Impact ◽  
Rapid Development ◽  
Social Economy ◽  
Green Building ◽  
Electrical Energy ◽  
New Energy

<p>With the rapid development of social economy, the demand for new energy is also increasing, and then the problem of large consumption also has a negative impact on the development of the construction industry. Under the concept of green building, the design and construction units pay more attention to energy conservation and environmental protection, so they actively use photovoltaic new energy in the field of electrical energy conservation of construction projects, so as to improve people's quality of life. Starting from the principles and characteristics of building electrical energy conservation, this paper discusses the methods of building electrical energy conservation, and analyzes how to use photovoltaic new energy in the field of building electrical energy conservation, hoping to better practice the concept of energy conservation.</p>

scholarly journals Features of Non-Tariff Regulation of Construction Products Market in Ukraine

2019 ◽  
Vol 8 (4S) ◽  
pp. 15-19
Keyword(s):  
Construction Industry ◽  
Health And Safety ◽  
Legal Framework ◽  
State Regulation ◽  
Market Regulation ◽  
The European Union ◽  
National System ◽  
Construction Products ◽  
Quality Of Products

The article deals with the issue of state regulation over the construction products industry. Analysis resulted in the identification of two main forms of regulation: tariff and non-tariff regulation. Global practices show the effectiveness of non-tariff regulation in the construction industry. Being a WTO member, Ukraine has to implement the legal framework of non-tariff regulation, in regards to those aspects contributing to compliance with the rating and standards of the European Union to ensure the quality of products. The main objective of non-tariff market regulation is to ensure the quality of finished products, environmental protection, health and safety of life. The national system of regulation, including technical rate-setting of the construction products manufacturing must comply with the international documents ratified by Ukraine. The article analyzes the domestic legal framework and proposes an algorithm for designing a national system of non-tariff regulation in accordance with international rules and standards.

Sign in / Sign up

Export Citation Format

Share Document