An innovative multi dof TMD system for motorcycle handlebars designed to reduce structural vibrations and human exposure
| Autor: | Elisabetta Leo, S. Agostoni, M. Pezzola, Federico Cheli |
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| Rok vydání: | 2012 |
| Předmět: |
Engineering
Modal analysis media_common.quotation_subject Aerospace Engineering Reciprocating engine Inertia Accelerometer Ride-comfort Automotive engineering Reciprocating motion Tuned mass damper Engine unbalances Civil and Structural Engineering media_common Motorcycle handlebar business.industry Mechanical Engineering Computer Science Applications Vibration Control and Systems Engineering Signal Processing Transient (oscillation) business Structural vibrations reduction |
| Zdroj: | Mechanical Systems and Signal Processing. 31:298-315 |
| ISSN: | 0888-3270 |
| DOI: | 10.1016/j.ymssp.2011.11.018 |
| Popis: | Motor vehicle ride comfort is mainly affected by reciprocating engine inertia unbalances. These forces are transmitted to the driver through the main frame, the engine mounts, and the auxiliary sub systems—all components with which he physically comes into contact. On-road traction vehicle engines are mainly characterized by transient exercise. Thus, an excitation frequency range from 800 RPM (≈15 Hz for stationary vehicles) up to 15,000 RPM (≈250 Hz as a cut off condition) occurs. Several structural resonances are induced by the unbalancing forces spectrum, thus exposing the driver to amplified vibrations. The aim of this research is to reduce driver vibration exposure, by acting on the modal response of structures with which the driver comes into contact. An experimental methodology, capable of identifying local vibration modes was developed. The application of this methodology on a reference vehicle allows us to detect if/when/how the above mentioned resonances are excited. Numerical models were used to study structural modifications. In this article, a handlebar equipped with an innovative multi reciprocating tuned mass damper was optimized. All structural modifications were designed, developed and installed on a vehicle. Modal investigations were then performed in order to predict modification efficiency. Furthermore, functional solution efficiency was verified during sweep tests performed on a target vehicle, by means of a roller bench capable of replicating on-road loads. Three main investigation zones of the vehicle were detected and monitored using accelerometers: (1) engine mounts, to characterize vibration emissions; (2) bindings connecting the engine to the frame, in order to detect vibration transfer paths, with particular attention being paid to local dynamic amplifications due to compliances and (3) the terminal components with which the driver comes into contact. |
| Databáze: | OpenAIRE |
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