Car on bumpy road5/27/2023 This documents a well-established trend, AM/FM has been losing ground in the home to smart speakers and streaming media for some time. Of the leading 71% who said they spent less time listening to radio, spending less time in the car was the main reason they gave. Fasten your seat belt, this could be a rough ride. Some of the information seems to contradict. Information provided in the recent survey focuses on that. The short answer as to why might be more time spent at home, and less in cars. With the increase of the nugget diameter, the durability and service life of a body decreases.Īn article about this study was published in the Simulation Modelling Practice and Theory journal.Perhaps the greatest negative impact that COVID has had on radio, according to Jacob Media’s TechSurvey 2021, has been on AM/FM listening in the automotive mediascape. The team also found out that the service life of a vehicle body can be affected by the nugget diameter of spot welding joints (connection points at which two sheets are welded together). Moreover, the front of a vehicle body turned out to be twice more prone to damage than the rear, regardless of the speed and road type. For example, 100 spot weld joints were damaged when the model moved on a type E road at the speed of 5 km/h 50-at 15 km/h, and only 40-at 10 km/h. The results of this studyshow that low speeds on bumpy roads can cause more body damage than medium ones. So, 72 values had to be calculated for each experiment,” said Kazem Reza Kasyzadeh, an associate professor at the Department of Mechanical and Instrumental Engineering of the Engineering Academy, RUDN University. Each of these 12 points is affected by six force and momentum components. “We modeled the movement of a vehicle on different types of roads and at different speeds and measured force and momentum at 12 suspension attachment points, that is, the points at which the suspension transmits the load to the body. With 4 types of roads and 3 speeds on each of them, the team conducted 12 experiments in total. Type E was assigned to the bumpiest of all roads on which the speed was only 5, 10, and 15 km/h. For example, type B was an almost perfectly smooth road with no bumps and the model moved on it at the speed of 50, 70, and 90 km/h. Then, the research team created a computer simulation in which the ’car’ moved on different types of roads at different speeds. It describes interactions within a system of details that move relative to one another. To develop this model, scientists used the so-called multibody dynamic method. Using this model, one can assess fatigue resistance of a car without conducting expensive experiments. An associate professor from RUDN University created a mathematical model that describes all possible damages of spot welded joints caused by fatigue failure. The level of fatigue resistance can be measured experimentally, but it requires a lot of expendable supplies and a testing site with special equipment. A vehicle body with damaged spot welded joints has lower level of vehicle crashworthiness. The vehicle body structure is the main load-bearing part among other parts of the car. Cyclic stress leads to the formation of micro-cracks, and after some time, spot welded joints fail. A car on a bumpy road is subjected to different dynamic loads that causes fatigue failure.
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