Acoustics Management Predictions Measurements Analysis. Rail vehicle acoustics. Know-how and experience in vibro-acoustics.

Transcription

1 Acoustics Management Predictions Measurements Analysis Rail vehicle acoustics Know-how and experience in vibro-acoustics

2 Our competence The engineering company Müller-BBM is active in all sectors of acoustics and vibration technology and has been involved in railway and vehicle acoustics for decades. As an established partner of the railroad industry, we understand our customers and their needs and thus, we can offer custom-made services and solutions. m wheel: measurement of wheel roughness bogie and wagon wheel Calculated prognosis of airborne (left) and structure-borne (right) noise generated by floor a, lower b and upper c sidewall wheel / rail irregularities: parametric excitation rail sleeper soil Calculative prediction of the interior noise level Experimental study Prediction of exterior noise RIM: calculative prediction of rolling noise and vibrations Vibro-acoustic know-how and In the concept phase, we support Our extensive, measurement-based At the same time we have fostered An overview of our expertise: The Müller-BBM testing laboratory long-term experience for your manufacturers of rail vehicles in the experience on trains enables us to conti- the development of special measuring K Vibro-acoustic consultation during sound and vibration is accredited vehicle development definition of acoustic goals and in nuously check the results for plausibility devices for the railroad industry such the entire vehicle development: according to ISO/IEC for all The development of rail vehicles is a working out unambiguous descriptions in the planning phase. With advanced as roughness measurement systems for from the concept and development relevant investigations and assessments complex process in which diverse of detailed acoustic specifications for and effective measurement and analysis rails and wheels. And, Müller-BBM has phase up to the acceptance tests concerning acoustics and vibrations in partly even contradictory requirements and tender documents. techniques, such as transfer path ana- established a highly effective tool for and the type approval rail vehicles and on railroad tracks. have to be met. Next to safety, fire lyses, we gain insight into the dynamic the prediction of interior noise, which K Calculative acoustic prognosis protection, weight, energy consump- Within the scope of what is generally and acoustic behaviour of rail vehicles. is still used in all acoustics management based on the respective stage of In addition, Müller-BBM operates its tion and maintainability, vibro-acoustic called acoustics management, we projects. construction own DAkkS-accredited calibration requirements play an important role carry out calculative predictions while In our accredited testing laboratory, we K Analyses in structural dynamics laboratory for acceleration and acoustic in the development process. continuously checking compliance continuously examine the Research projects in the sector of rail K Our extensive measurement measurands. with acoustic requirements. With our of rail vehicles such as doors and acoustics are a good opportunity for equipment allows the application Interior and exterior noise as well as in-depth knowledge of acoustics we gangways as well as noise sources such Müller-BBM to share knowledge and to of a multitude of different analysis speech intelligibility inside the train are will be at your side for designing the as gearboxes and ventilation systems. gain new insights. As an active member methods significant criteria for the planning and appropriate acoustic measures. of the relevant committees and associa- K Müller-BBM provides consulting for the construction of new rail vehicles. Together with the Deutsche Bahn AG tions, we also promote the state of all types of rail vehicles: locomotives, (German Railways DB), we have the art in standardisation. main line vehicles, high-speed Müller-BBM brings in vibro-acoustic developed a computational procedure trains as well as trams, metro and know-how in all phases of development. for the prognosis of rolling noise and underground vehicles. vibration in trains and beneath railroad tracks (RIM). 2 3

3 Our services Müller-BBM is at your side in all phases of your project: from the vehicle concepts over the actual development to acceptance tests and homologation of the vehicles, our expertise will help you to solve vibro-acoustic problems. m wheel: measurement of wheel roughness Change of car design or Calculative noise prediction Acoustic review Iterative assessment and development until target values are achieved Assessment of the design concering noise and identification of deviations of objectives Development of mitigation measures or reduction of noise control treatments Tender phase Concept phase Development phase Type approval / acceptance tests Acoustics management in the development of rail vehicles Assessment of exterior noise at standstill Acoustics management Type approval of rail vehicles Careful acoustics management is a gua- Acoustics management means: Calculative prediction of Consultation Component tests Acceptance tests on rail vehicles: rantee that acoustic goals are achieved. K Exterior noise Special constructional solutions that are K Evaluation of the rail vehicle s con- K Interior sound pressure levels Consulting regarding acoustic and Performance of component tests, be K Interior noise customized to the requirements allow cept regarding the achievement of (passenger compartment, low-vibration constructions: it in your company, in our test stands or K Speech intelligibility of annoucement for systems and, which are the customer s acoustic requirements driver s cab) K Selection of materials, directly in the vehicle: systems (RASTI, STIPA) best both technically and commercially. K Continuous check, whether the K Airborne and structure-borne sound and possible mitigation measures K Sound power level of individual K Ride comfort agreed target values have been contributions for the typical test K Proposals for acoustic optimised K Ground-borne vibrations of rail vehicles Our goal is a consistent overall concept reached cases standstill and traveling with solutions and low-vibration K Force level (operational force, K Force density spectrum of rail vehicles which also meets all other requirements K Identification of critical operating constant speed on open track or in a constructions blocked forces) K Determination of roughness of besides acoustics. conditions as well as of their tunnel K Calculative and experimental K Sound reduction index of wheel treads respective sources and transmission K Exterior sound pressure level elaboration of mitigation measures such as access doors, windows or paths K Speech intelligibility transition systems Acceptance test of the test track K Definition of acoustic target values K Machine vibrations concerning: for individual K Track decay rate K Rail roughness 4 5

4 Our procedures Our long-term experience in rail vehicle acoustics has influenced the development of our own effective methods and tools positively. Furthermore, we have an extensive acoustic database of rail vehicles and rail vehicle of all types at our disposal. PAK : localization of sound sources Measurement on a resilient mounted wheel tread Ray-tracing: simulated sound level distribution in a tunnel FEM: noise mitigation of a platform edge OTPA: measurement setup Finding answers to your questions Measurement technology Modern analysis techniques: Labs and test stands (selection) Calculative tools and the elaboration of acoustic measures is the focus of our work. K Modern and extensive equipment K Transfer path analysis (classic TPA) K Test stand for the determination K Hybrid model NOMAC K Boundary element method (BEM) for Therefore, we work out an effective for multichannel measurements: and operational transfer path of the dynamic stiffness of resilient prediction tool developed by the calculation of radiated sound concept of analysis which suits the k Sundry measurands and sensor tech- analysis (OTPA) elements (e. g. for bearings or sub Müller-BBM for the calculation of K Wheel-rail-impedance model RIM for specific conditions of your project. nology (pressure, strain, deviation, K Operational deflection shape analysis ballast mats) airborne and structure-borne the prediction of pass-by noise levels, force, speed, rotational speed etc.) K Modal analysis K Floor / wall test stand for the determi- noise contributions to the interior vibration levels and sound contribu- At Müller-BBM, we have a multitude k Multichannel: typically chan- K Localisation of sound sources nation of the sound reduction index noise of a vehicle tions of the wheels, rails of different experimental, computa- nels; measurements with 200 or even (array measurement technology) of complete floor structures or other K Ray-tracing for the calculation of and sleepers as well as for the tional and numerical analysis methods more channels are possible, too K Analysis of rotational vibration such as access doors speech intelligibility and of the local prediction of ground-borne vibrations at our command. In our test stands, we k Time synchronisation of different K Psychoacoustic methods K Echo chamber for the determination sound pressure distribution in the can examine materials, or measuring systems and analyses of the sound absorption coefficient vehicle interior devices. K Laser-scanning K Model updating with FEMtools K Hemi-anechoic room with low K Statistical energy analysis (SEA) for K Array measurement technology background-noise for the determi- calculation of sound insulation K Sound intensity measurements nation of the sound power level of K Methods according to ISO for K Continuous measurements during calculating the exterior noise regular operation can be performed K Test stand for structure-borne sound damping 6 7

5 Buildings Building acoustics Room acoustics Media and communications technology Thermal building physics Building climatology Sustainability Fire protection Structural dynamics Building pollutants Environment Noise control Air pollution control Vibration control Light and electromagnetic fields Environmental compatibility Plant safety Legally compliant business organization Risk assessment Chemical analysis Technology Automotive acoustics Ship acoustics Rail technology Industrial acoustics Machine acoustics and machine dynamics Psychoacoustics Mobile communication Product testing Comprehensive solutions from a single source Consulting Planning Measuring Expert Opinion Research Müller-BBM GmbH is a subsidiary of Müller-BBM Holding AG, with headquarters in Planegg near Munich. Since 1962 Müller-BBM has been advising clients nationally and internationally and is now one of the world s leading engineering firms. More than 400 highly qualified employees form an interdisciplinary team of architects, scientists and engineers in the most diverse specialist fields. The company currently has twelve offices in Germany as well as branch offices in Austria and Switzerland. Notifications Müller-BBM is notified as an expert authority in accordance with 29 b of the German Federal Pollution Control Act (BImSchG). The notification comprises determining emissions and immissions of air pollutants, noise and vibration verifying the correct installation and function in addition to the calibration of continuous emission measurement systems (CEMS) checking combustion conditions As a test laboratory, Müller-BBM is authorized to render the services of an independent third-party provider for assessing and examining performance reliability in accordance with EU regulation no. 305/2011 (Construction Products Regulation). Accreditations Our testing and calibration laboratories are accredited according to ISO/IEC 17025: Test laboratory for sound and vibration, electromagnetic fields and light Test laboratory for immission protection, measurements of hazardous substances and chemical analysis Acoustic test laboratory for materials, and equipment Calibration laboratory for acceleration and acoustical parameters Müller-BBM has a significant number of employees with competency certificates that were awarded to them on an individual basis. They include publicly appointed and sworn experts, state-recognised experts and otherwise appointed and notified experts. Detailed information on the scope of our accreditation, its international validity and the corresponding certificates can be found on Headquarters Müller-BBM GmbH Robert-Koch-Strasse Planegg / Munich Germany Phone Fax