CadnaB Overview

Calculation Standards

The following standards are implemented in CadnaB:

ISO 12354: Calculation of airborne and impact sound insulation between rooms as well as the airborne sound insulation against outdoor sound via the façade walls.
When using ISO 12354, following parameters can be calculated:
- Performance parameters according to ISO 717-1 (airborne sound insulation) and ISO 717-2 (impact sound insulation)
- ASTM-parameters (STC, OITC, IIC)
DIN 4109: Calculation of airborne and impact sound insulation between rooms as well as the airborne sound insulation against outdoor sound via the façade walls.

Handling and Modelling

CadnaB´s concept is based on the modelling of the whole building. Walls, doors, windows and other elements can be modelled in 2D while seeing the changes in 3D in realtime:

Numerous junction types are automatically detected by CadnaB depending on the geometry of the walls and the selected constructions.
In addition to the geometry of the walls and the assigned constructions, doors and windows can be inserted with a few clicks. The construction of these elements is also selected via the construction browser.
Furthermore, airborne sound transmitting systems can be added.
Complete buildings can be imported, created from scratch or constructed by copying storeys.

Import of Bitmap floor plans

CadnaB supports the import of bitmap files, e.g. containing the floor map. Bitmaps can be comfortably calibrated within CadnaB. Afterwards, entire storeys with multiple rooms or even entire buildings can be easily modelled by drawing the elements on top.

Project Organization

The CadnaB workflow is organised in different modes. Each mode is suited for a certain group of tasks:

Project mode: used for entering new objects or modifying exiting objects. In this mode, any type of element can be filtered and displayed.
Constructions mode: This mode is used to assign constructions to walls, doors, windows or floors. When an object is opened, the construction browser appears showing all libraries.
Results mode: This mode allows to start the calculation, check the results and export a report.
Usage mode: In this mode you can assign different types of usage to the rooms within your project.
Noise levels: For defining sound levels for rooms or façade walls.

Import of BASTIAN worksheets

CadnaB provides an easy to use import of BASTIAN worksheets. The single room pair can be directly used for calculation (e.g. according to ISO 12354). If the user activates the compatibility mode to ISO 12354, series 2000, comparable results to BASTIAN can be generated.

Import of INSUL files

CadnaB also imports constructions generated by INSUL (Marshall Day Acoustics)*, as XML files. All data including the sketch are imported. For constructions with several parts, such as a slab with a screed, the user can select which one to import.

*Option PRO required
*Requires exported XML files from INSUL version 9.0.24 or later

Interoperability with CadnaA

CadnaB-buildings can be placed in a CadnaA model with a few clicks to calculate the level in front of the façade. In case of ISO 12354, the interior level can be calculated based on the façade level with consideration of the building acoustic properties. When using DIN 4109, the “relevant exterior noise level” can be calculated and transferred to CadnaB.

Interoperability with CadnaR

Manage and organize CadnaR files for an entire building in CadnaB.
Use CadnaR in the sending and receiving room to consider the position of sources, receivers and obstacles inside the room. The transmission through the wall is calculated based on the building acoustic properties defined in CadnaB including selected constructions, doors or windows.
Automatic calculation of the spatially averaged reverberation time for all rooms which are linked to a CadnaR project.

The “Results” mode

The results mode allows you to check all calculated results, which are organized for every two adjacent rooms. This makes the fast-checking of any specific room pair within a building very intuitive.

Airborne and impact sound transmission results (single and 1/3 octave bands)
Partial results for separating element and flanks (single and 1/3 octave bands)
Information about junctions
Interior level results

The result types shown depend on the selected standard, the evaluation parameters and the transmission situation.

Auralization*

In CadnaB, the result of the calculation can be made audible with the help of binaural auralization. This allows the user to imagine the effect of a constructional measure. For this purpose, a source in the form of an audio file is simulated in the sending room or in front of the facade, which is then reduced by the calculated sound reduction index.

*Option PRO required

Fulfillment of requirements

In addition to the numerical results, CadnaB allows the inclusion of requirements according to national or local standards. Many predefined requirements are available within the requirements browser. You can then check whether any room pair fulfills the requirement or not by means of comprehensive visual icons.