{"title":"Torque Converter Dynamic Characterization Using Torque Transmissibility Frequency Response Functions: Open Clutch, Hydro-Mechanical Response","authors":"L. Jurmu, D. Robinette, J. Blough, C. Reynolds","doi":"10.1007/s40799-025-00777-6","DOIUrl":null,"url":null,"abstract":"<div><p>The torque transmissibility frequency response functions of four torque converters were measured over a range of operating conditions. In previous works, frequency response function measurements of torque converters contained test setup dynamics which dominated the measurements. Thus, a unique torque converter dynamometer was deployed to measure said frequency response functions and to quantify torsional vibration isolation performance. The frequency response of the hydro-mechanical torque converter was measured under simulated powertrain boundary conditions and separate from other powertrain dynamics. The tested hardware variations covered a range of K-factor, diameter, and lockup clutch damper architectures. The experimental results demonstrated the presence of a damper mode (only present in the turbine damper architectures), which showed that the open torque converter transmits enough torsional vibration to excite downstream damper springs. A lumped parameter model of the torque converter and test setup, containing a widely used hydrodynamic torque converter sub-model, was also validated with the test data. The hydrodynamic torque converter behaved like a low pass filter in the frequency domain, and its performance was characterized with a cutoff frequency. The best correlated model had an average percent error of 10% in the 0–10 Hz frequency range, showing that an accurate prediction of the frequency response could be obtained in the 0–10 Hz range from the hydrodynamic torque converter model. The lumped parameter model consistently overpredicted the natural frequency of the damper mode, and inertial coupling between the working fluid and mechanical torque converter elements or the sensitivity of friction parameters were presented as possible explanations for the natural frequency error.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"49 5","pages":"811 - 827"},"PeriodicalIF":1.9000,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experimental Techniques","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s40799-025-00777-6","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The torque transmissibility frequency response functions of four torque converters were measured over a range of operating conditions. In previous works, frequency response function measurements of torque converters contained test setup dynamics which dominated the measurements. Thus, a unique torque converter dynamometer was deployed to measure said frequency response functions and to quantify torsional vibration isolation performance. The frequency response of the hydro-mechanical torque converter was measured under simulated powertrain boundary conditions and separate from other powertrain dynamics. The tested hardware variations covered a range of K-factor, diameter, and lockup clutch damper architectures. The experimental results demonstrated the presence of a damper mode (only present in the turbine damper architectures), which showed that the open torque converter transmits enough torsional vibration to excite downstream damper springs. A lumped parameter model of the torque converter and test setup, containing a widely used hydrodynamic torque converter sub-model, was also validated with the test data. The hydrodynamic torque converter behaved like a low pass filter in the frequency domain, and its performance was characterized with a cutoff frequency. The best correlated model had an average percent error of 10% in the 0–10 Hz frequency range, showing that an accurate prediction of the frequency response could be obtained in the 0–10 Hz range from the hydrodynamic torque converter model. The lumped parameter model consistently overpredicted the natural frequency of the damper mode, and inertial coupling between the working fluid and mechanical torque converter elements or the sensitivity of friction parameters were presented as possible explanations for the natural frequency error.
期刊介绍:
Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques.
The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to:
- Increase the knowledge of physical phenomena
- Further the understanding of the behavior of materials, structures, and systems
- Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.