Testing | Checking | Measuring

Dynamic stiffness is a key indicator of the effectiveness of sound insulation underlays and of the reduction of impact sound in flooring systems. To determine this property precisely, our experts carry out measurements in accordance with the DIN EN 29052-1 standard. This test method determines the resonant frequency of the vertical fundamental vibration of a system consisting of the insulating material to be tested and a panel placed on top of it, which is excited by sinusoidal signals.

The P6 wall test stand at Fraunhofer IBP provides the ideal platform for determining the sound insulation of a wide range of wall constructions, including glass partitions, noise barriers and mobile walls. Measurements are carried out in accordance with DIN EN ISO 10140-2, using cladding shells that reliably suppress flanking transmission. The flexible test opening and integrated Halfen channels enable quick assembly and easy adaptation to specific requirements. Whether for cinemas, offices, or other applications, the test stand delivers results that enable profound acoustic optimization. Equipped with state-of-the-art technology and accessible infrastructure, the P6 test stand is designed for complex projects and innovative construction solutions.

The ceiling test stand at Fraunhofer IBP is specifically designed to measure airborne and impact sound insulation, as well as the impact sound reduction of timber structures such as timber beam ceilings, solid wood ceilings, and lightweight ceilings. With two adjacent reverberation rooms, separated by a variable ceiling support, the test stand enables analysis according to DIN EN ISO 10140. Flanking transmissions are minimized by additional linings, while standardized tapping machines and alternative impact sound sources, such as fitness weights or Japanese rubber balls, are used for measurements. The test stand is ideal for use in residential buildings, for industrial roofs, and innovative construction projects. In addition to low-frequency impact sound, walking noise and structure-borne sound can also be analyzed to ensure comprehensive acoustic optimization.

Laser scanning vibrometry enables non-contact vibration analysis for a wide variety of objects. Using a customizable measurement grid and automatic scanning, the system captures detailed vibration data, making vibration patterns visible and rendering them as videos. With a frequency range of up to 40 kHz and a broad measurement spectrum, the technique meets even the most complex requirements. It is suitable for analyzing machines, devices, tools, and components, accomodating both structure-borne and airborne sound excitations. With the ability to export data for modal analysis or simulation into external programs makes laser scanning vibrometry a flexible and powerful solution for optimizing vibration behavior and noise emissions.

The PK combined test stand at Fraunhofer IBP is specifically designed to determine the sound insulation performance of room-height components such as doors, windows, window facades, and large-scale partition walls. The test stand meets the requirements of the standard DIN EN ISO 10140-5:2021. Spatial and temporal averaging of sound pressure levels is achieved by means of a pneumatically moved dodecahedron loudspeaker and rotating microphones, enabling highly precise measurements under realistic conditions. To suppress flanking transmissions, a circumferential joint separates the source and receiving rooms. The combined test bench is not only suitable for conventional building components, but also for specialized applications in automotive, aerospace, and marine industries.

The building acoustics test laboratory is recognized by the German Institute for Building Technology (DIBt) as an approved Group I testing center authorized to carry out the full range of performance and quality tests according to DIN 4109.

In order to study and further develop innovative supply concepts for residential buildings, heating systems (with/without solar thermal or photovoltaic panels), their storage units, ventilation systems and control concepts under realistic conditions prior to practical use, Fraunhofer IBP has twin houses on its field test site.

In the hearing threshold laboratory, we conduct precise hearing threshold measurements and hearing tests. This purpose-built laboratory is designed to conduct measurements near the threshold of hearing and to perform comprehensive sound evaluations. The laboratory creates optimal conditions for subject tests in order to accurately evaluate building-physical sounds, product sounds or environmental sounds via headphones. The special design minimizes interference from external noise, ensuring precise and reliable psychoacoustic measurements.

The semi-anechoic chamber with all-wheel drive chassis dynamometer at Fraunhofer IBP provides a state-of-the-art environment for conducting detailed acoustic tests on vehicles. This testing facility makes it possible to realistically simulate driving conditions for cars, vans and motorcycles in order to accurately measure both interior and exterior noise. Among other tests, we use the facility to carry out simulated pass-by noise tests according to ISO 362-3 and UN-ECE R51, in which the exterior noise is measured at a defined distance. In addition to a Safety-Walk™ surface, rough asphalt surface elements or impact bars can be installed. Thanks to a versatile pallet changing system, vehicles can be efficiently prepared for decoupling studies, for example, or to mount sensors. The facility also boasts a fully-equipped workshop with lifting platforms, tire fitting and wheel balancing stations, as well as a fast-charging station for electric vehicles.

The acoustic camera uses an array of microphones to precisely localize sound sources. The sounds emitted by a source are recorded by several microphones. The differences in the time of arrival of the incoming sounds (phase position) can be used to draw conclusions about their location and intensity. A color noise map created from these signals is optically superimposed on the photo or video of the object under investigation.

Measuring sound absorption in the impedance tube offers manufacturers and users of absorber materials the opportunity to test their products under standardized conditions. Besides the absorption coefficient, impedance is also measured in order to obtain detailed information about the material. Since only small-sized samples are needed, this method is particularly suitable for developing and optimizing new materials. In addition, fully-developed products can be certified in accordance with DIN EN ISO 10534-2.

Our state-of-the-art testing facilities at Fraunhofer IBP are specially designed to provide advanced solutions in silencer and component testing. We perform standardized measurements in compliance with DIN EN ISO 7235 to precisely analyze the insertion loss, sound power and pressure losses of your products. Equipped with both rectangular and round test tunnels, our facilities enable us to carry out comprehensive tests on silencers and other components used in ventilation and process air systems. The tests we carry out ensure that your products are developed with the highest quality and efficiency, so you can be certain that your solutions meet the strictest international standards.

At Fraunhofer IBP in the Acoustic Department's acoustically optimized semi-anechoic chamber, you have the opportunity to carry out precise sound measurements under optimal conditions. This chamber simulates the acoustic conditions of a free field above a reflecting plane and makes it possible to accurately determine the radiated sound power and directional characteristics of sound sources. Thanks to the special sound-absorbing materials that line the walls and ceilings, reflections are minimized, and an authentic free field is created.

Our anechoic chamber is a state-of-the-art testing facility specially designed for carrying out precise acoustic measurements. Thanks to the acoustically optimized environment, which corresponds to the conditions of a free field, we can analyze sound sources with the highest accuracy. The walls and ceilings of the chamber are lined with special sound-absorbing materials such as wedge absorbers, which almost completely eliminate reflections. This enables sound power and directional characteristics to be precisely determined in accordance with the DIN EN ISO 3745 standard.

Using our specialized wind tunnel, we can conduct precise analyses of flow noise in accordance with DIN EN ISO 7235. The low-noise air flow allows us to precisely measure the aerodynamic noise generated on surfaces. This helps optimize components for use in ventilation and process air applications. Our tests provide crucial data for improving silencers and other components. We offer comprehensive solutions, particularly in the fields of fluid mechanics and aerodynamics, quality assurance and certification, as well as industrial applications and environmental technology. Our services are designed to optimize products with regard to noise emissions and efficiency. With our outstanding testing facility, we help companies perfect their components in terms of sound attenuation and airflow. We use the latest equipment and maximum precision to ensure that the results meet our high quality standards.

Expandable climate simulator (-30 to 80°C and relative humidity up to 90 %) for large and heavy components with a loading bay 3.5 x 4.5 m in size.

Characterizing the infrared reflectance and emissivity of surfaces using a hemispherical blackbody radiator in accordance with DIN 22097 and 15976.

We use nearfield acoustics holography to perform measurements in the frequency range from 800 Hz to 5 kHz. This technique is particularly effective for visualizing sound fields, localizing sound sources and identifying the cause of the noise. With the help of the nearfield hologram, weak points in sound transmission (sound insulation) and various sound sources can be visualized, localized and examined.

By determining airflow resistance in accordance with DIN EN ISO 9053-1, one of the most important characteristics of absorbers can be measured under standardized conditions: airflow resistance in proportion to length. This parameter gives manufacturers and users of absorber materials valuable information about the material properties and can be used to create a calculation model.

Fraunhofer IBP’s silencer testing facility is a state-of-the-art installation for testing and optimizing silencers and aerodynamic components in accordance with DIN EN ISO 7235. Manufacturers benefit from precise measurements of insertion loss, sound power and pressure loss, which serve as a basis for developing efficient, high-performance products. The testing facility makes it possible to study and further develop innovative concepts under controlled conditions. The versatile design of the test tunnel allows it to be adapted to specific customer requirements, while the latest measuring equipment enables detailed acoustic analyses to be carried out. Strict noise control measures ensure that results are not affected by external noise, thus guaranteeing high measurement accuracy and reliability.