Investigation of the forced structure-borne noise transfer through the gear body of powder metallurgical spur gears for the speed-related design of the noise emission of high-speed transmissions

• Applicant: Professor Dr.-Ing. Christian Brecher
• Subject Area: Engineering Design, Machine Elements, Product Development
• Term: from 2020 to 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 450663051

• Final Report Year: 2024

Final Report Abstract

The reduction of noise emission is considered a general target of gear design. In addition to the macro and micro geometry, the design of the gear body geometry and density can optimize noise emission. The overall objective of developing a method for designing the gear body of powder-metallurgical cylindrical gears with regard to insulation and damping has been achieved. Based on the specification of drive train-specific critical frequencies and human auditory perception, a target level is calculated to which the transfer function of the gear set is optimized. The objective is to minimize the difference level between the transfer function and the target level and to minimize the mass. The gear natural frequencies are shifted into non-critical frequency ranges and the power density of the gear set is increased as a result of weight reduction. The optimization system is based on parameterized automatically generated gear body geometries, which represent the solution space of the optimization. The characteristic values of the gear body influence are the transfer function, the gear body load capacity and the operating behavior in terms of transmission error and the tooth root and tooth flank load capacity. The boundary conditions are the specification of the minimum material thickness and the load capacity of the gear body and gear teeth.

Publications

• Analyse des Körperschalltransfers im Zahnradkörper, in: 62. Arbeitstagung "Zahnrad- und Getriebeuntersuchungen" des WZL am 19./20. Mai 2021
  Scholzen, P.; Brimmers, J. & Brecher, C.
  
• Influence Of Densification And Case Hardening On The NVH Behavior Of Sintered Gears. World PM2022 Proceedings. EPMA.
  Scholzen, Philipp; Brimmers, Jens & Brecher, Christian
  
• Ressourceneffiziente Verzahnungen - Geräuschverhalten radkörpermodifizierter PM-Zahnräder, in: 63. Arbeitstagung "Zahnrad- und Getriebeuntersuchungen" des WZL am 1./2. Juni 2022
  Scholzen, P.; Brimmers, J. & Brecher, C.
  
• Sustainable Gears - Design of Gear Body Modified PM Gears; in: 9th WZL Gear Conference USA 2022 : Gear and Transmission Technology, July 21st/ 22nd 2022, Elgin, IL/ USA, Hrsg.: Brecher, C.; Bergs, T., Apprimus Verlag Aachen 2022, ISBN 978-3-00-072698-9, S. 2-1 bis 2-20
  Scholzen, P.; Brimmers, J. & Brecher, C.
  
• Sustainable Gears - Design of Gear Body Modified Powder Metal (PM) Gears; in: Gear Technology 39 (2022), 7, ISSN 0743-6858, S. 46-57 (Open Source)
  Scholzen, P.; Brimmers, J. & Brecher, C.
  
• Geräuschoptimierte Radkörperauslegung pulvermetallurgischer Stirnradverzahnungen, in: 64. Arbeitstagung "Zahnrad- und Getriebeuntersuchungen" des WZL am 31. Mai/1. Juni 2023
  Scholzen, P.; Brimmers, J. & Brecher, C.
  
• Auslegung geräuschoptimierter pulvermetallurgischer Stirnradverzahnungen, Dissertation, RWTH Aachen, (Veröffentlichung in 2024, Prüfungstermin 12.12.2023)
  Scholzen, P.