Research on split and evolution of acoustic cavity resonance frequency of rotating loaded tire

The tire acoustic cavity resonance noise (TACRN) is known to contribute to audible noise in the passenger compartment of a vehicle. In order to reduce TACRN effectively, its mechanism needs to be grasped better. In this paper, the calculation formulas of tire acoustic cavity resonance frequency for four different conditions such as static unloaded tire, static loaded tire, rotating unloaded tire, and rotating loaded tire are analyzed and verified by the simulation and experiment. In particular, the resonance frequency formulas of static loaded tire introducing inflation pressure and rotating loaded tire are proposed and verified, respectively, in this paper. And the influence of tire inflation pressure, load, and running velocity on splitting frequency are studied. Some new findings are described and discussed; for example, the first-order resonance frequency may split into four resonance frequencies in most cases, and may split into three resonance frequencies in certain cases when a loaded tire is rotating. And the existing conditions for three and four resonance frequencies are also discussed.

The spectrum of body injuries of the driver and passenger in the case of a lethal traffic injury in a frontal collision in the interior of class E cars

The article discusses the state of examination of a lethal automobile injury to a driver and a passenger in a frontal collision in the passenger compartment of class E cars. Aim of the work. Investigate the injuries of the driver and passenger in the passenger compartment of an E class car and highlight the signs of being in the passenger compartment in the driver’s or passenger’s seat for practical use in forensic medical research. Materials and methods. The objects of the study were 179 «Acts of forensic medical examination of corpses» and «Conclusions of an expert» on road accidents accompanied by injury and death of people obtained from the archives of the Zhytomyr Regional Bureau of Forensic Medical Examination, accompanied by the death of persons inside car. The damage to the driver and passenger in a frontal collision in the passenger compartment of class E cars was carefully considered. A set of proven reliable methods was used in the work: anthropometric, morphometric, photographic, forensic, statistical analysis. Results. As a result of the registration of damages, the features inherent in damages received in the passenger compartment of an E-class car in a frontal collision were revealed. In particular: injuries to the soft tissues of the left leg prevailed among the front seat passengers, and not among the drivers, as is commonly believed; fractures of the bones of the lower extremities were found only in drivers; fractures of the bones of the right upper limb were observed only in front seat passengers; damage to the soft tissues of the left hand was characteristic only of drivers; the drivers had pelvic fractures on the right and left; the drivers had rib fractures on the left in combination with ruptures of the lungs on the side of the injury; the passengers had injuries to the ribs on the right, but no right-sided ruptures of the lungs were recorded. Conclusions. It has been established that the spectrum of damage to a driver and a passenger in a fatal car injury in a frontal collision in the passenger compartment of class E cars is characterized by a sufficient variety. Fractures of the right and left lower extremities and fractures of the thoracic spine are among the features that distinguished the driver from the passenger in a frontal collision in the passenger compartment of class E cars.

Development of a simulation model of the heating process in the passenger cabin of a vehicle under low temperature conditions

Introduction. A distinctive feature of working conditions in the Arctic territories is the long period of exposure to low temperatures. Passenger transportation by road is becoming one of the key aspects of ensuring the continuity of the production process. The task of delivering workers to the place of work, moving them between work zones during a work shift is solved by using wheeled vehicles of various categories. One of the most widespread types of wheeled vehicles used to transport workers is the M3 category wheeled vehicles with a capacity of no more than 22 passengers. Ensuring the thermal comfort of vehicle passengers seems to be relevant, since ensuring biophysical compatibility minimizes the risks of cold injury by workers and maintains a high level of performance.Materials and methods. The results of the analysis of the Russian and foreign studies in the direction of ensuring thermal comfort and ensuring biophysical compatibility in confined spaces are presented. The results of computer modelling of the dynamics of microclimate parameters in the passenger cabin of a wheeled vehicle of M3 category with a capacity of no more than 22 passengers are presented.Results. The paper presents the results of theoretical studies, microclimate parameters in the passenger compartment of vehicles, taking into account the breathing of passengers and changes in the gas composition of exhaled air. Theoretical studies of the operation of the heating system of the passenger compartment were carried out, taking into account the refined breathing model of passengers. Distributions of microclimate parameters in the section of the passengercompartment were obtained when using a heating system with one heater; the impact of passengers’ breathing on the parameters of the microclimate in the passenger compartment was assessed.Discussion and conclusion. Based on the numerical solution of the system of heat transfer equations, directions for further research and recommendations are formulated to ensure thermal comfort in the passenger compartment of a wheeled vehicle at low temperatures. The materials of the work may be of interest to specialists involved in the design and ergonomics of wheeled vehicles, labor protection.

Optimal Design of Green Tech Hybrid Electric Integrated Aircraft and Solar Disk Airships for Short Arctic Air Transport Corridors

The Ecology Decarburization issues decision may focus priority to the complex Design Analysis of the more Optimal Structure of the Large E-Aircraft and E-Airship for decrease of the Weight and Engine Power with Hybrid Electric Propulsion (HEP) systems are very actually today for Worldwide Ecology Program. The Method of Aircraft layout from the virtual mass center is given, which allows us to obtain the Aircraft layout from the conditions of Infrastructural Constraints in the terminal configurations of the Modern Air Transportation Infrastructure and IATA/ICAO Regulation. Calculate Method is proposed for the synthesis of new circuit solutions for an Aircraft passenger compartment and may be use to any Solar E-Dirigibles Projections future. A Geometrical representation of the concept of LHA with large passenger capacity made with a Drop-Shaped Fuselage in the Aerodynamic balancing Flying Wing Body Scheme is given. The new Body Plane E-Aircraft and Lighter-then-Air (LTA) Vehicles with cover of Solar Film Component Systems will be more innovation projections for High Safety Green Tech Air Transportation.

Numerical calculation of passenger compartment cooling effect under the action of radiative cooling film based on MATLAB

Radiative cooling uses space cold source to cool the object, and the radiative cooling film made by using this principle can be applied to automobiles effectively to save the refrigeration resources of automobiles. However, due to the limitation of economy, time, space and other factors, it is difficult to carry out comprehensive research on the actual film-forming cooling effect. Based on the principle of passive radiative cooling, a set of simulation models is developed, which is applied to the selection of infrared radiation materials for automotive radiative cooling film and the study of the influence of environmental factors on the radiative cooling effect. SiO2 was finally selected as infrared radiation material. At the same time, the theoretical cooling temperature of the radiative cooling film applied to the passenger compartment of automobiles can reach 6.8°C under the conditions of 35°C ambient temperature, 0.99 atmospheric transmittance and 10 heat transfer coefficient, using SiO2 as infrared radiation material and PE as dispersion substrate. At the same time, the cooling effect of the radiative cooling film is positively correlated with the ambient temperature, atmospheric transmittance to some extent.

Innovative Styling and Structural Design of New Duplex Wide-Body Passenger Aircraft Based on Mobile Edge Computing

The research is designed to explore wide-body aircraft that are more suitable in 2035-2040. The innovative design of the wide-body aircraft adopts the form of the main passenger compartment and wing separation, the passenger compartment in the form of a single engine car through the rail transit and transfer car travel together. The transfer car delivers the two engine cars in turn to the aircraft, which is tightly connected to the rail structure by mechanical claws. Engine cars can split up at the transfer station, thus assisting in the diversion of passengers. The interior of the engine car has been optimized. A visual mask can be used for isolation has been designed for the seats. And a device is designed to lighten passengers’ legs to alleviate “economy class syndrome.” The corresponding data analysis used the mobile edge computing technology.