Vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support
Abstract Four-degree-of-freedom (4-DOF) human–chair coupling models are constructed to characterize the different contact modes between the head, chest back, waist back and backrest. The seat-to-head transfer ratio (STHT) is used as an evaluation metric for vibration reduction effectiveness. The sim...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2024-03-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-024-56109-y |
| _version_ | 1797247330406105088 |
|---|---|
| author | Wei Ding Leizhi Wang Zhaobo Chen Hongrui Ao Hui Yan |
| author_facet | Wei Ding Leizhi Wang Zhaobo Chen Hongrui Ao Hui Yan |
| author_sort | Wei Ding |
| collection | DOAJ |
| description | Abstract Four-degree-of-freedom (4-DOF) human–chair coupling models are constructed to characterize the different contact modes between the head, chest back, waist back and backrest. The seat-to-head transfer ratio (STHT) is used as an evaluation metric for vibration reduction effectiveness. The simulated vibration reduction ratio of the model is close to the experimental results, which proves the validity of the model. The peak STHT is obviously reduced (P < 0.05, T-test) with seat-backrest support. The experiments show that supporting the head ( $${a}_{1}$$ a 1 , P < 0.05, Wilcoxon matched-pairs signed ranks) has the best vibration reduction effect (21%), supporting the chest back ( $${a}_{2}$$ a 2 , P < 0.05) has a reduced effect (11%), and supporting the waist back ( $${a}_{3}$$ a 3 , P < 0.05) has the weakest effect (4%). When the upper torso is in full contact with the backrest, the peak STHT curve and resonance frequency are positively correlated with the contact stiffness of the seat surface and negatively correlated with the contact damping. In order to reduce the seat-to-head transfer ratio, the lowest STHT peak and lowest total energy judgments were proposed as the selection methods for the selection of the contact stiffness and damping of the backrest in two environments (periodic and non-periodic excitation), respectively. |
| first_indexed | 2024-04-24T19:56:59Z |
| format | Article |
| id | doaj.art-5211dca91fd14987a901195101b57ccc |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-24T19:56:59Z |
| publishDate | 2024-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-5211dca91fd14987a901195101b57ccc2024-03-24T12:17:33ZengNature PortfolioScientific Reports2045-23222024-03-0114111410.1038/s41598-024-56109-yVibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest supportWei Ding0Leizhi Wang1Zhaobo Chen2Hongrui Ao3Hui Yan4School of Mechatronics Engineering, Harbin Institute of TechnologySchool of Mechatronics Engineering, Harbin Institute of TechnologySchool of Mechatronics Engineering, Harbin Institute of TechnologySchool of Mechatronics Engineering, Harbin Institute of TechnologySchool of Mechatronics Engineering, Harbin Institute of TechnologyAbstract Four-degree-of-freedom (4-DOF) human–chair coupling models are constructed to characterize the different contact modes between the head, chest back, waist back and backrest. The seat-to-head transfer ratio (STHT) is used as an evaluation metric for vibration reduction effectiveness. The simulated vibration reduction ratio of the model is close to the experimental results, which proves the validity of the model. The peak STHT is obviously reduced (P < 0.05, T-test) with seat-backrest support. The experiments show that supporting the head ( $${a}_{1}$$ a 1 , P < 0.05, Wilcoxon matched-pairs signed ranks) has the best vibration reduction effect (21%), supporting the chest back ( $${a}_{2}$$ a 2 , P < 0.05) has a reduced effect (11%), and supporting the waist back ( $${a}_{3}$$ a 3 , P < 0.05) has the weakest effect (4%). When the upper torso is in full contact with the backrest, the peak STHT curve and resonance frequency are positively correlated with the contact stiffness of the seat surface and negatively correlated with the contact damping. In order to reduce the seat-to-head transfer ratio, the lowest STHT peak and lowest total energy judgments were proposed as the selection methods for the selection of the contact stiffness and damping of the backrest in two environments (periodic and non-periodic excitation), respectively.https://doi.org/10.1038/s41598-024-56109-yBackrestHuman–chair coupling modelSTHT |
| spellingShingle | Wei Ding Leizhi Wang Zhaobo Chen Hongrui Ao Hui Yan Vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support Scientific Reports Backrest Human–chair coupling model STHT |
| title | Vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support |
| title_full | Vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support |
| title_fullStr | Vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support |
| title_full_unstemmed | Vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support |
| title_short | Vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support |
| title_sort | vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support |
| topic | Backrest Human–chair coupling model STHT |
| url | https://doi.org/10.1038/s41598-024-56109-y |
| work_keys_str_mv | AT weiding vibrationreductionofhumanbodybiodynamicresponseinsittingpostureundervibrationenvironmentbyseatbackrestsupport AT leizhiwang vibrationreductionofhumanbodybiodynamicresponseinsittingpostureundervibrationenvironmentbyseatbackrestsupport AT zhaobochen vibrationreductionofhumanbodybiodynamicresponseinsittingpostureundervibrationenvironmentbyseatbackrestsupport AT hongruiao vibrationreductionofhumanbodybiodynamicresponseinsittingpostureundervibrationenvironmentbyseatbackrestsupport AT huiyan vibrationreductionofhumanbodybiodynamicresponseinsittingpostureundervibrationenvironmentbyseatbackrestsupport |