Abstract:This paper shows the results of a study conducted on five different categories of vehicles in a specific test site. The aim was to investigate how the effect of the test site discontinuity determines variations of comfort related to the increase in speed and to the five selected road vehicles of different classes. Measurements were obtained by combining data relating to vibrations in the three reference axes, detected through a vibration dosimeter (VIB-008), and geolocation data (latitude, longitude, and speed… Show more
“…Taking this into account, for the validation of the comfort simulation strategy on the electric Stewart Platform from Figure 1, an experimental campaign has been designed to excite the natural frequencies of the chassis in the 6 DOF (see Figure 2), in order to evaluate the accelerations perceived in 6 DOF of the center of the seat as a consequence of these excitations. 34,35 propose to select characteristic driving maneuvers according to their frequency of occurrence in real traffic: acceleration, deceleration, and lane change 36,37 also propose to include bumpy roads into the comfort evaluation experiment.Figure 2.Comfort tests maneuvers.…”
In this paper, the validation of the comfort simulation strategy on an electric Stewart Platform under road driving scenarios is explained. First, an introduction to the vibroacoustic comfort theory in passenger cars is presented. Second, the Stewart Platform used for the validation process is explained. Third, the methodology conducted for the validation of a hexapod for ride comfort applications is detailed. Finally, the Stewart Platform has been validated under real world road driving scenarios for the 6 degrees-of-freedom by means of the Vibration Dose Value. The final goal of the validation strategy of the electric Stewart Platform is to perform ride and comfort studies in a driving simulator for the 1–10 Hz frequency range.
“…Taking this into account, for the validation of the comfort simulation strategy on the electric Stewart Platform from Figure 1, an experimental campaign has been designed to excite the natural frequencies of the chassis in the 6 DOF (see Figure 2), in order to evaluate the accelerations perceived in 6 DOF of the center of the seat as a consequence of these excitations. 34,35 propose to select characteristic driving maneuvers according to their frequency of occurrence in real traffic: acceleration, deceleration, and lane change 36,37 also propose to include bumpy roads into the comfort evaluation experiment.Figure 2.Comfort tests maneuvers.…”
In this paper, the validation of the comfort simulation strategy on an electric Stewart Platform under road driving scenarios is explained. First, an introduction to the vibroacoustic comfort theory in passenger cars is presented. Second, the Stewart Platform used for the validation process is explained. Third, the methodology conducted for the validation of a hexapod for ride comfort applications is detailed. Finally, the Stewart Platform has been validated under real world road driving scenarios for the 6 degrees-of-freedom by means of the Vibration Dose Value. The final goal of the validation strategy of the electric Stewart Platform is to perform ride and comfort studies in a driving simulator for the 1–10 Hz frequency range.
“…(Passi et al, 2021); the mechanical vibration can be characterized by vibration frequency, vibration intensity, etc. (Barone et al, 2016); the air pressure can be quantified by background pressure, pressure change rate, pressure transient intensity, etc. (Schwanitz et al, 2013).…”
Section: Elements Affecting Passengers' Comfortmentioning
In recent years, due to the rapid progress of urbanization, the subway system with the advantages of large transport capacity, punctuality, efficiency, convenience and safety has become one of the main transportation modes in metropolitan areas. With the increase in passenger flow, the comfort of subway passengers has attracted extensive attention from the academic community. In this paper, we begin by analyzing the characteristics of the subway environment and sort out six environmental elements that affect passengers’ comfort, including thermal environment, vibration, noise, lighting, air quality, and air pressure. In addition, the measurement scheme, calculation model, and evaluation method of each element are outlined based on relevant norms and literature. Through reviewing the studies in the past 2 decades, it is found that the in-depth research is still in demand for a comprehensive comfort evaluation model with multi-element coupling. A deep understanding of the subway passengers’ comfort is the basis for the design, development, and operation regulation of the subway environmental control system. Measures to improve comfort, especially the exploitation of energy-saving air conditioning systems, will provide strong support for the sustainable and sound growth of the rail transit industry.
“…However, since it is complicated to simulate a set of vibrations with predetermined thresholds to be subjected to the collective transport users, the survey was conducted with a private vehicle (Land Rover Freelander 2) on a reference test site located on Viale Principe in Rende (CS) with the collaboration of 100 users. Starting from the study [29], in which the relationship between the traveling speed of vehicles and the acceleration V (overall whole-body vibration acceleration) is demonstrated, specific speed thresholds were defined allowing obtaining certain values of acceleration. Each user was asked to give, by means of a scale from 1 (highly comfortable) to 5 (extremely uncomfortable), the level of vibrational comfort perceived on the vehicle that runs with predetermined speed (with a tolerance of ±2 km/h): Parameters used to determine vibrational comfort on board are (frequency-weighted RMS acceleration in m/s 2 , along the three axes , , and ) and V , overall whole-body vibration acceleration, determined using the following formulation:…”
The use of collective transport is strongly influenced by the quality of offered service. One of the overriding factors that affect the modal shift process is the quality of transport systems. To increase the attractiveness of collective transport services and therefore reduce the use of cars, authorities in collaboration with transport companies should take steps to ensure a high level of service quality in the public transport system. The provided quality is the level of quality achieved on daily basis and measured by the customer/user point of view. This research aims to relate service quality perceived by the user to measurements of two environmental indicators, that is, vibration, in reference to which the acceleration transmitted to the body by the vehicle motion and by its vibration will be measured, and noise, in reference to which the Equivalent Sound Pressure Level-Leq ( )-will be measured. Finally, a Comfort Index (CI) (rail) is specified, calibrated, and validated.
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