Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan
This paper investigates the creep groan of a vehicle’s brake experimentally, analytically, and numerically. Experimentally, the effects of acceleration on caliper and strut, noise, brake pressure, and tension are measured. The results show that the measured signals and their relevant spectra broadly...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2019/1843205 |
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| _version_ | 1849683555770171392 |
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| author | Dejian Meng Lijun Zhang Xiaotian Xu Yousef Sardahi Gang S. Chen |
| author_facet | Dejian Meng Lijun Zhang Xiaotian Xu Yousef Sardahi Gang S. Chen |
| author_sort | Dejian Meng |
| collection | DOAJ |
| description | This paper investigates the creep groan of a vehicle’s brake experimentally, analytically, and numerically. Experimentally, the effects of acceleration on caliper and strut, noise, brake pressure, and tension are measured. The results show that the measured signals and their relevant spectra broadly capture the complex vibrations of creep groan. This includes the simple stick-slip, severe stick-slip vibrations/resonances, multiple harmonics, half-order harmonics; stick-slip-induced impulsive vibrations, steady/unstable vibrations, and their transitions. Analytically, a new mathematical model is presented to capture the unique features of half-order harmonics and the connections to fundamental stick-slip/resonant frequency and multiple harmonics. The analytical solution and the experimental results show that the vibro-impact of the brake pad-disc system can be triggered by severe stick-slip vibrations and is associated with instable, impulsive stick-slip vibration with wideband. The induced stick-slip vibro-impact can evolve into a steady and strong state with half-order, stick-slip fundamental, and multiple-order components. This new mechanism is different from all previously proposed mechanisms of creep groan in that we also view some type of creep groan as a stick-slip vibration-induced vibro-impact phenomenon in addition to conventional stick-slip phenomena. The new mechanism comprehensively explains the complex experimental phenomena reported in the literature. Numerically, the salient features of phase diagrams of instable stick-slip and vibro-impact are examined by using a seven-degree-of-freedom brake system model, which shows that the phase diagrams of the dynamics of creep groan with and without vibro-impact are substantially different. The phase diagram of the dynamics with vibro-impact is closer to the experimental results. In contrast to existing mechanisms, the proposed new mechanism encompasses the instable stick-slip nature of creep groan and elaborates the inherent connections and transition of the spectrogram. The new knowledge can be used to attain critical improvements to brake noise and vibration analysis and design. By applying the proposed new model in addition to existing models, all experimental phenomena in creep groan are elaborated and quantified. |
| format | Article |
| id | doaj-art-d4c0b978f5a04885840acfc5f04b8dde |
| institution | DOAJ |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-d4c0b978f5a04885840acfc5f04b8dde2025-08-20T03:23:50ZengWileyShock and Vibration1070-96221875-92032019-01-01201910.1155/2019/18432051843205Sensing and Quantifying a New Mechanism for Vehicle Brake Creep GroanDejian Meng0Lijun Zhang1Xiaotian Xu2Yousef Sardahi3Gang S. Chen4School of Automotive Studies, Tongji University, Shanghai 201804, ChinaSchool of Automotive Studies, Tongji University, Shanghai 201804, ChinaCollege of IT & and Engineering, Marshall University, Huntington 25755, WV, USACollege of IT & and Engineering, Marshall University, Huntington 25755, WV, USACollege of IT & and Engineering, Marshall University, Huntington 25755, WV, USAThis paper investigates the creep groan of a vehicle’s brake experimentally, analytically, and numerically. Experimentally, the effects of acceleration on caliper and strut, noise, brake pressure, and tension are measured. The results show that the measured signals and their relevant spectra broadly capture the complex vibrations of creep groan. This includes the simple stick-slip, severe stick-slip vibrations/resonances, multiple harmonics, half-order harmonics; stick-slip-induced impulsive vibrations, steady/unstable vibrations, and their transitions. Analytically, a new mathematical model is presented to capture the unique features of half-order harmonics and the connections to fundamental stick-slip/resonant frequency and multiple harmonics. The analytical solution and the experimental results show that the vibro-impact of the brake pad-disc system can be triggered by severe stick-slip vibrations and is associated with instable, impulsive stick-slip vibration with wideband. The induced stick-slip vibro-impact can evolve into a steady and strong state with half-order, stick-slip fundamental, and multiple-order components. This new mechanism is different from all previously proposed mechanisms of creep groan in that we also view some type of creep groan as a stick-slip vibration-induced vibro-impact phenomenon in addition to conventional stick-slip phenomena. The new mechanism comprehensively explains the complex experimental phenomena reported in the literature. Numerically, the salient features of phase diagrams of instable stick-slip and vibro-impact are examined by using a seven-degree-of-freedom brake system model, which shows that the phase diagrams of the dynamics of creep groan with and without vibro-impact are substantially different. The phase diagram of the dynamics with vibro-impact is closer to the experimental results. In contrast to existing mechanisms, the proposed new mechanism encompasses the instable stick-slip nature of creep groan and elaborates the inherent connections and transition of the spectrogram. The new knowledge can be used to attain critical improvements to brake noise and vibration analysis and design. By applying the proposed new model in addition to existing models, all experimental phenomena in creep groan are elaborated and quantified.http://dx.doi.org/10.1155/2019/1843205 |
| spellingShingle | Dejian Meng Lijun Zhang Xiaotian Xu Yousef Sardahi Gang S. Chen Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan Shock and Vibration |
| title | Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan |
| title_full | Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan |
| title_fullStr | Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan |
| title_full_unstemmed | Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan |
| title_short | Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan |
| title_sort | sensing and quantifying a new mechanism for vehicle brake creep groan |
| url | http://dx.doi.org/10.1155/2019/1843205 |
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