Maria Machimbarrena

• PhD
• Professor at University of Valladolid

La madera contralaminada es un producto industrializado de madera que ha incrementado exponencialmente su uso en la industria de la construcción debido a su eficiencia estructural, su ligereza, su carácter sostenible y su competitividad económica. Así, en los últimos años, se está utilizando este producto para la construcción de edificación colecti...

Recent research focuses on sustainable building retrofitting to reduce energy consumption and enhance indoor human comfort. While various criteria influence building systems, this study narrows down to airtightness and acoustics due to limited literature connecting them. This study progresses in two phases. Firstly, intentional openings are gradual...

III Congreso Ibero-Latinoamericano MAD de la Madera en la Construcción (CIMAD 24) : Libro de Actas de Resúmenes Extendidos

The current European standards demand more energy-efficient, comfortable, and sustainable buildings and encourage the incorporation of recycled materials in building construction. Timber buildings are successfully competing with traditional building materials in addressing these challenges; however, one of the weaknesses of timber systems is their...

The potential relation between airtightness and acoustic performance of constructive solutions is not yet well known and described, although it has been widely proved that both phenomena have strong links. The objective of this research is to provide additional experimental knowledge in this field of research, working in a controlled environment,...

Intensive care units (ICUs) are busy and noisy areas where patients and professional staff can be exposed to acoustic noise for long periods of time. In many cases, noise levels significantly exceed the levels recommended by the official health organisations. This situation can affect not only patient recovery but also professional staff, making IC...

In Peru, as in many countries worldwide, varying degrees of restrictions have been established on the movement of the population after the World Health Organization (WHO) declared the condition of pandemic by COVID-19. In Lima, there have been different degrees of compulsory social immobilization (CSI), and the resumption of activities was planned...

A circus-theater is a particular type of theater space. It is mainly characterized by the possibility of interchanging the typical configuration of theater, where the stage house is settled in quasi-circularly to the audience area, to a circus configuration, in which the stage is totally surrounded by the audience area. Despite the abundant literat...

In a pilot study in 2016 about acoustic requirements for housing and schools in Europe and South America with comparisons between the two regions, significant differences in acoustic descriptors and limit values were found, both internally in the regions and between them. The countries considered in South America were Argentina, Brazil and Chile. N...

When considering the uncertainty of sound insulation measurements, there are two different approaches: to use standardized uncertainties as per ISO 12999-1 or to make individual uncertainty calculations for each measurement and corresponding single number quantity. When following the second approach, it is accepted that the uncertainty of any 1/3 o...

An international standard defining a common acoustic classification scheme for dwellings is under development by ISO TC43/SC2/WG29, based on the outcomes of the European project COST Action TU0901. The proposal offers an opportunity for countries to establish building acoustic requirements using a harmonized set of descriptors. This harmonized set...

Traditionally in the field of building acoustics no individual uncertainty calculations are performed for sound insulation measurements. One of the settled justification is that it is impossible to retrieve correlation between 1/3 octave bands when considering single number quantity uncertainty. To enlighten this issue, this paper presents, for air...

Traditionally in the field of building acoustics no individual uncertainty calculations are performed for sound insulation measurements. One of the settled justification is that it is impossible to retrieve correlation between 1/3 octave bands when considering single number quantity uncertainty. To enlighten this issue, this paper presents, for air...

The Brazilian acoustics regulation for new residential buildings entered into force in 2013, and during the past years, the construction and acoustic consultancy market developed new procedures to accomplish with the façade requirements. In this paper, typical existing methods are presented, as well as new proposals to be incorporated in the future...

A standard defining a common acoustic classification scheme for dwellings is under development by ISO TC42/SC2/WG29 based on the outcomes of European project COST Action TU0901. The proposal stands on the assumption that in the long term many countries will establish building acoustic requirements using a harmonized set of descriptors, and the hypo...

This study presents a comparison between heavyweight and lightweight walls, in terms of perceived loudness of pink noise transmitted through 10 different walls. The objective is to investigate whether the single number descriptor RA,50–5000 adequately reflects the subjective perception of the acoustic performance of a wall and if the sound reductio...

The need for revision and harmonization of sound insulation descriptors is generally accepted among most building acoustics specialists. Undoubtedly, if all countries used the same descriptors, it would be a great advantage to all the sectors related to the building construction industry, legislators and final users. Concerning sound insulation reg...

Acoustic regulations for housing and schools exist in most countries in Europe, the main reasons being protection of health of citizens in their homes and optimizing learning and work conditions in schools. Comparative studies in Europe have shown a high diversity of descriptors and limit values for acoustic requirements. Considering globalization...

The aim of the paper is to give suggestions in order to improve the sound insulation performance of double brick walls. Initially, a comparison of typical solutions used in Italy and in some European countries (UK, Spain and Belgium) are reported. The results of the comparison suggest possible changes in the way the brick walls are built in order t...

The study, carried out between 2009 and 2013 as part of the European COST Action TU0901, concerning the Integration and Harmonization of Sound Insulation Aspects in Sustainable Urban Housing Constructions, led to the definition of a database of construction solutions and guidelines of good practice for sound insulation of buildings, at the European...

In building acoustics the measurement uncertainty of sound insulation measurements is traditionally either not reported or reported as stated in the corresponding standard ISO 12999–1:2014. Determination and application of measurement uncertainties in building acoustics—Part 1: Sound insulation (former ISO 140-2). An alternative procedure is presen...

RESUMEN: Por fin en pleno siglo XXI la sociedad es consciente de la necesidad de incluir los conceptos de sostenibilidad y eficiencia energética en el sector de la edificación. Gracias a que existe un amplio consenso internacional, la mayor parte de los países desarrollados han establecido fechas límite a partir de las cuales todos los edificios nu...

Listening test have proved to be effective as a method to rate the subjective perception, although their preparation and performance can be tedious and there are many possible sources of bias. These biases are mainly caused by the human interaction of both the researcher and the participant. The aim of this research is the development of matlab-ass...

COST Action TU0901 ended at the beginning of 2014 with the involvement of many European Countries. The materials collected during the project and the content of the e-book open up very interesting discussions on the potential effects on each single country. Partitions typically used in southern European countries are quite different from those buil...

Building acoustics panorama is of renovation and change in different aspects. Negative health effects of general noise exposure due to adjoining dwellings are well known, but it is still a challenge assessing the perception of users and correlating it with physical descriptors of sound insulation. Many studies are being developed on the way to purp...

The book is the result of Cost Action TU 0901 and is aimed to: propose harmonized descriptors for airborne and impact sound insulation, propose a European acoustic classification scheme for dwellings, establish a catalogue of sound insulation data for construction solutions found in the different participating countries and produce an on-line compe...

Multiple Authored Book Neighbour noise is a significant problem having had insufficient attention for decades, both for existing housing and new housing. Time had come to solve the challenges by establishing a common framework in building acoustics throughout Europe. As a consequence, the research network, COST Action TU0901 “Integrating and Harmon...

Neighbour noise is a significant problem having had insufficient attention for decades, both for existing housing and new housing. Time had come to solve the challenges by establishing a common framework in building acoustics throughout Europe. As a consequence, the research network, COST Action TU0901 “Integrating and Harmonizing Sound Insulation...

Resumen La Unión Europea nace para propiciar la integración y gobernanza en común de los estados y los pueblos de Europa. Además de crear un marco legislativo que asegure la libre circulación de ciudadanos, bienes, y servicios, se ha creado una política común en muchos otros aspectos tales como el mercado, la agricultura, la pesca… El ruido ambient...

During the COST TU0901 Training School which has taken place in january 2013, a survey was made asking to the participants about their opinions over the acoustical condition of their own houses. Are acoustician annoyed by noise in their domestic life? How important was sound insulation when they were choosing their dwelling? Finally, are acousticia...

The draft NWIP ISO 16717-1 represent the proposed replacement of the ISO 717-1 standard for the calculation of the single number ratings for airborne sound insulation in buildings. One of the main features of the proposal is that the traditional standardized noise level difference (D nT,w) measured from 100 Hz to 3150 Hz will be replaced by a new s...

The objective of this paper is to investigate on the uncertainty of in situ airborne sound insulation measurements. A large set of field data has been used to perform individual uncertainty calculations curves using a GUM based approach (ISO Guide to the Expression of Uncertainty in Measurement). Based on these results, the uncertainty of various s...

The European Union was created to promote the integration and joint governance of the States and people in Europe. Besides creating a legislative framework to ensure the free movement of people, goods, and services, the EU has created a common policy in many other aspects such as marketing, agriculture, fishing ... Environmental noise problems h...

Resumen El proyecto persigue valorar la exactitud de los resultados proporcionados por los programas predictivos empleados en el estudio de impacto acústico de parques eólicos en su fase pre Para un parque elegido como caso obtenidos con un sistema de cálculo publicadas en años diferentes, de un software de confrontar los métodos predictivos emplea...

Resumen El proyecto persigue valorar la exactitud de los resultados proporcionados por los programas predictivos empleados en el estudio de impacto acústico de parques eólicos en su fase pre Para un parque elegido como caso obtenidos con un sistema de cálculo publicadas en años diferentes, de un software de confrontar los métodos predictivos emplea...

Rating indices are single number quantities used to characterize the acoustic behavior of a constructive solution and are commonly used by administrations and governments to establish the requirements for acoustic insulation. These single numbers try to "summarize" information which is frequency dependent into one single figure, and by doing so in...

The main purpose of this work is to establish a methodology which uses the advantages of stratified sampling to study noise perception. Taking as a starting point the results of an existing psychosocial survey of a large population sample, the proposed procedure consists in stratifying the original sample into homogeneous groups (clusters or classe...

The Spanish building sector has been affected by the enforcement of the Spanish Building Code (Código Técnico de la Edificación - CTE [1]). This regulation is divided into several Basic Documents (DB) concerning six main fields: Structural Safety, Fire Safety, Using Conditions Safety, Health-Hygiene conditions, Noise Protection and Energy Saving. A...

The purpose of the work described in this paper is twofold: (i) to present the results of an experimental investigation of the sound attenuation in different types of forest, and (ii) to validate a part of the Nord 2000 model. A number of measurements have been carried out in regular and irregular forests with trees with deciduous and evergreen lea...

Environmental noise can produce negative effects on people’s health since it interferes with basic activities such as sleeping, resting, studying and communicating. These effects depend not only on the physical characteristics of the noise itself, but also on parameters associated to each person and each environment. It is thus important to study n...

The aim of this study is to understand the effect of flanking transmissions on room sound transmission. For this purpose, three tests have been carried out in-situ in three rooms with similar layout. The assessment method consisted of cutting one or two slits on the source room walls and measuring before and after cutting. Measurements of air-borne...

Since some years ago, citizens of different countries demand for better quality construction in theirs dwellings. One of the factors to consider in order to achieve higher comfort is the sound insulation in partitions. In the present work, we have made a comparative study of sound insulation values between the measurements made "in situ" some years...

Flanking transmission in building structures can be estimated using the Intensity technique according to the method described in the standard EN 15186-2 Annex C. This can also be done by using Vibration measurement technique. In situ conditions, the junctions of a room show different behaviours when compared to those obtained in laboratory. Measure...

Building structures can provide different flanking transmissions in situ condition compared to those in laboratory. Two different measurement techniques were used and compared for this paper. Both techniques measured the airborne sound insulation in buildings (between rooms) and evaluated the contribution of the partition wall and respective flanki...

The acoustic behaviour of two building systems, a traditional concrete structure and an innovative one involving expanded polystyrene (EPS) elements have been compared using field measurements. The results indicate that the airborne sound insulation is very similar for both construction methods, whereas impact sound insulation is better for the inn...

Conventional and intensity-based sound transmission loss measurements have frequently been compared in the literature. Looking at published results determined under laboratory conditions, one would come to the conclusion that it is only possible to obtain good agreement between the two methods in a very restricted frequency range. It has often been...

Sound insulation under laboratory conditions and in situ is compared for two different and alternative measurement techniques: pressure and intensity method. For laboratory measurements no systematic divergence is found. When measuring in situ greater differences are found and explained. Reliable intensity measurements are made up to 10 kHz. Absorb...

In this paper we present the experimental data for the acoustic impedance of different materials (typical ground and construction materials) according to different measurement techniques.

In order to measure the impedance of small samples under laboratory conditions, the most frequent is to use the impedance tube. On the other hand, when it comes to "in situ" measurements, this technique is no longer valid since it has many disadvantages. Recently a new technique based on two microphone measurements or intensity technique is being d...