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In a driving car, passengers are submitted to complex sound and vibration stimuli. These stimuli are integrated in a complex way and contribute to the comfort for passengers. This talk will summarize some work related to that field, during which a noise and vibration simulator was used to evaluate the relative contributions of noise and vibration t...
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A detailed case study on using in-situ blocked forces for advanced NVH development of automotive structure-borne sound sources is presented. The discussed approach provides a realistic auralization of a steering system virtually operated in a vehicle using in-situ blocked forces from a bench with vehicle transfer paths allowing reliable subjective...
Citations
... Increasingly often, it also includes noise [15], but very rarely vibrations propagating through the ground into the building. The relationship between vibration and comfort is mainly considered not in the built environment but in vehicles [16,17]. However, in more densely urbanized areas, buildings are closer to sources of vibration such as roads, railways or trams. ...
Historic buildings constitute a specific group of buildings where the possibilities of improving energy efficiency and comfort are significantly limited because of the existing construction features and heritage values. Each building has a different history so the scope of renovation and/or retrofitting must be determined individually for each building. This article presents the methodology of measurement and diagnosis of features of particular importance for energy performance and comfort improvements, based on the example of a historic masonry building located in southern Poland. The first research question was which of the comfort conditions have been exceeded according to measurements. The second issue concerned the necessary extension of the basic determinants of comfort, beyond measurable qualities. A multi-faceted approach to the comfort assessment is proposed, including qualitative research that applies the additional criterion of aesthetic comfort. During the case study diagnosis, the acceptable level was exceeded in thermal, acoustic and aesthetic comfort. The first two may be addressed by optimized technical measures whilst the latter through a research-through-design that addresses the complex relationship between the perceiver and what the environment affords. The solution reflects the need to meet demands for retrofits that are energy-efficient and aesthetically pleasing while minimizing any negative impacts on the heritage and the environment.
... In other research, Daruis studied a driver's perception on the influence of interior sound to vertical whole-body vibration in his vehicle and discovered that the annoyance on vibration was more affected by the presence of sound than the annoyance of sound with vibration presence [19]. A study on the contribution of noise and vertical vibration to the comfort in a driving car using a vehicle simulator was conducted, and the results suggested that the interaction of both stimuli was very small but the relative contributions of sound and vibration to comfort were different from the referenced existing model [20]. Maigrot, et al. [21] conducted two laboratory methods of assessing annoyance due to railway noise and vibration by considering total annoyance due to combined noise and vibration and partial annoyances due to each source in the presence of the other. ...
... The equation can relatively indicate the level of discomfort of a passenger in a vehicle and subsequently be developed into methods in indicating relative discomfort level in the vehicle. Figure 8(a) shows a variation of discomfort from the combined noise and vibration in a vehicle under different operating speeds and between two different types of vehicles by applying the root-sumsquare-model equation (20). For example, RDIA-B=0.13 ...
Exposure to noise and whole-body vibration (WBV) has been a key element in determining comfort levels in transportation systems. In the automotive industry, researchers and engineers continuously work on reducing noise and vibration levels to minimize discomfort. Noise annoyance in vehicles results from structure-borne as well as airborne noise from vehicle powertrain, tires and aeroacoustics. Whole-body vibration affects vehicle passenger comfort at the seat pan, back rest and feet. The objective of this research is to evaluate the comfort level of seated passengers in a vehicle from noise and whole-body vibration by considering both separate and combined modality. The noise and vibration data were recorded and analysed in two vehicles on the same highway road with four different speeds. The vibration exposure in vehicle were evaluated based on ISO2631-1:1997. Noise exposure was based on A-weighted sound pressure level. The combined discomfort on noise and vibration were quantified. The vibration results identified clear dominant of z-axis vertical vibration on seat pan, backrest and feet in both vehicles. The discomfort of combined noise and vibration showed that vehicle B caused a higher discomfort level at the high vehicle speed of 90 km/h and 110 km/h. The Relative Discomfort Indicator (RDI) were introduced to compare levels of discomfort from noise and vibration in different vehicles with varying speeds. The result suggests that the RDI value for vehicle A relative to vehicle B is negative at higher vehicle speed which further indicates that at higher speed, vehicle B have a higher discomfort level compared to vehicle A. The RDI value is expected to be useful for automotive Noise, vibration and harshness (NVH) improvement. Keywords: Combined noise and whole-body vibration; vehicle interior noise; whole-body vibration (WBV), relative discomfort indicator (RDI)
... Passenger comfort studies in a fast moving train is a very important issue to be taken into consideration by the designers of railway systems [1][2][3]. In recent times, many nations are inaugurating the fast-moving trains running at very high speeds. ...
The irregularity in the railway tracks is a very common topic of interest among the researchers in recent times. The trains run on the tracks with very high velocities to meet the demands of the passengers. But due to the unevenness of the track, the body of the train car faces vertical accelerations, which in turn causes discomfort to the passengers sitting inside the train car. In the present report, vertical acceleration is analyzed for uneven tracks by taking the car body as a single degree of freedom model. The investigation shows a clear explanation of the critical velocity values for the train, so as to maintain the passenger comfort conditions. Random sinusoidal curves were generated using MATLAB to analyze the random unevenness of the track. It is observed that the vertical accelerations in the car body are directly proportional to the speed of the train. Finally, a critical velocity is proposed for a train running on uneven sinusoidal profile track such that, the vertical acceleration not exceeding 0.2g.
