Mornington Lodge Rates Pet

Juan Frias

Aecor

already are ten European countries that have a sound rating system for buildings that exceed the noise requirements contained in their legislation. Through these systems provides added value to buildings that exceed the minimum acoustic conditions encouraging housing market based on quality, which will revert to a higher qualification of professionals involved in the construction process and encourage the development of new products and building systems more acoustic efficiency.

The last country to join this global trend that has been Italian, the month of July 2010 approved the Italian standard UNI 11367:2010 "Acoustics in edilzia: Clasiificazione immobiliari acustica delle Unita. Procedura di valutazione e check in opera ", which describes the procedures for classifying acoustically real estate units. Under this rule, property unit means any part of a building (home, office, industrial space, etc.) Or building (buildings, offices, hotels, teachers, etc.), Or set of buildings that, according to local use has a range functional and income.

1. Acoustic parameters listed in acoustic classification

The acoustic classification is based on a verifiable system requirements by measuring "in situ" of the following parameters:

airborne sound insulation of facades: Differential levels D2m standard, nT, w (dB)
airborne sound insulation of interior partitions (horizontal and vertical) dividers use units: apparent sound reduction Index: R'w (dB)
impact sound insulation between different units of usage: L'nw (dB)
sound pressure level from continuously operating facilities: Lic (dBA)
sound pressure level from operating facilities discontinuous Lid (dBA)

The noise classification can be expressed for each requirement separately, or through a global value. The value of each requirement is obtained by averaging all the values \u200b\u200bof each parameter obtained from measurements in situ of the various elements of the building, and in turn, through a new averaged values of each requirement we obtain the global value.

2. Classes and system requirements

The following table shows the four classes listed in this classification system building acoustics:

Any value less than class IV, shall be deemed not classifiable known by the acronym NC.

3. Classification procedure

The first step in classifying any property unit is to identify all measurable elements, affected by the requirements of Table 1. In general, if the corresponding building unit used a single unit such as a single dwelling or a single office, should be measured all of its constructive elements. In the event that the building unit is a full height building configurations and construction elements repeated in different plants, there is the possibility to carry out tests "in situ" measurements only in a limited number of building elements according to a sampling plan specified in Annex G of the rules themselves.

3.1. Sampling Plan

The procedure de muestreo especificado en la norma UNI 11367 se basa en la identificación de grupos homogéneos de lo que la norma denomina elementos técnicos acústicamente equivalentes. Se considerará que dos parejas de recintos son equivalentes si:

Las dimensiones del elemento separador
Dimensiones de los recintos
Metodología de prueba
Igualdad de elementos constructivos (masa, espesor, materiales)
Condiciones frontera
Presencia de instalaciones o elementos pasantes
Método de ejecución/instalación

The choice of these samples is based on detailed analysis of the building project, both from the point of view of the solutions, as their meetings, dimensions, positions and specifications of the facilities. For buildings, these homogeneous groups should be composed of elements from different units of use.

Regarding dimensional separation of building components and compounds involved, a tolerance of 20%. The number of trials in each condition in each homogeneous group must be at least 10% (rounded to nearest whole number), with minimal 3 trials per group.

is possible that these buildings have elements that differ from each other and they can not grouped in any homogeneous group and which were not able to apply the method of sampling but should be tested in all cases. Ie a requirement to assess a building we must consider the elements grouped into homogeneous groups that can implement the sampling plan and the heterogeneous elements, not grouped, and therefore should be tested in its entirety.

3.2. Measurement methods

tests "in situ" to evaluate each requirement executed according to the following standards:
- ISO 140-4: airborne sound insulation of interior partitions (horizontal and vertical)
- ISO 140-5: airborne sound insulation of facades
- ISO 140-7: Isolation impact noise between units use different
- ISO 10052 and ISO 16032: sound pressure level from installations of continuous and discontinuous

3.3. Calculation of the resulting class

Regardless measurements have been made of all elements or have been conducted only in a limited number of possible application of this system sampling to identify homogeneous groups, calculate the net worth or utility value of each test. This utility value is defined as the value obtained in the test corrected with the value of the measurement uncertainty (Um) for each type of test and shown in the following table:

The correction of measurement uncertainty we will rest when it comes to isolation parameters a) and b) and adding to those who try to sound pressure levels c) d) e).

Xi = xi-UXi for a) and b) Yi = yi +
Uyi to c), d) e)

then gets the value of each homogeneous group from the average of the net values \u200b\u200bobtained from each of the tests have been performed for each requirement, according to the following expressions:

Xr = Σ (Xi) / n) and b)
Yr = Σ (Xi) / n c), d) e)

where n is the number of tests performed for each homogeneous group

has done a show, you should also take into account the uncertainty for that sampling Ush, which depend on the standard deviation values of tests for each homogeneous group and the level of confidence you want to declare and determine the value of the coverage factor k. UNI 11367 standard provides the confidence level of 70, 75 and 80%. The expression used to determine the uncertainty of sampling is as follows:

Ush = ssh * k

From net average value and uncertainty sampling, we obtain the representative value of each homogeneous group:

Xrh = Xr-Ush for a) and b)
YRH = Yr + Ush to c), d) e)

And you get the value of each requirement a), b), c) d) e ) calculating the mean energy of homogeneous groups involved:

Xrj ^{Σ = -10 lg (10-Xrh/10/n)} for a) and b)
Yrj ^{Σ = 10 lg (10-thirteenth / 10 / n)} to c), d) e)

where n is the number of homogeneous groups on which it has tested a requirement.

Finally, by comparing the values \u200b\u200bobtained are in Table 1, we obtain the class corresponding to each condition Ci. It is also possible to classify the entire building with a single global index Zui, which are weighted for the type obtained for each requirement according to the following table: