Abstract
The influence of mounting motors in wheels’ hubs and flexibility of the twist beam rear suspension on their dynamics and strength is presented in the paper. The international roughness indicator (IRI) is applied to assess the overcoming of road unevenness. This indicator is a combination of a shape of the road unevenness and of overcoming velocity. The movement of a wheel’s axis during obstacles overcoming is described. For the needs of the dynamics analysis, the mathematical model of the rear suspension system with embedded motors is developed using the MSC.Adams-ANSYS interface. The discrete model of the twist beam is prepared in the ANSYS software, which is used in the next step to construct the dynamics model of the rear suspension system using the MSC.Adams program. The vertical components of displacement and acceleration of the wheel’s centre, forces in the suspension’s springs and dampers, as well as forces in the joints are analyzed. The analysis of the suspension beam’s stress during the road unevenness overcoming is also carried out.
Highlights
Academic Editor: Aldo SorniottiIn the era of growing market share in hybrid and electric cars, it is worth considering how mounting motors in a vehicle’s wheels affects its movement and the strength of the suspension components
The problem of the wheel axis movement and forces acting on it results from the theunevenness, wheel axis wheel movement and forces acting on it results from the heightThe andproblem shape ofof road movement velocity, suspension characteristics, height and shape of road unevenness, wheel movement velocity, suspension characterisand vehicle parameters
The tiretire deflection occurring on on thethe edge of the the unevenness largely depends on the effective angle of the road plane, the contact area of the tire with the road depends on the effective angle of the road plane, the contact area of the road pends on the effective angle of the road plane, the contact area of the tire with the road unevenness, and its height and shape
Summary
In the era of growing market share in hybrid and electric cars, it is worth considering how mounting motors in a vehicle’s wheels affects its movement and the strength of the suspension components The application of such driving systems change many factors, which can affect vehicles’ dynamics, such as safety, ease of steering, comfort and the durability of the suspension components. The analysis is carried out for motors placed in the wheels of the rear axle of a car with a semi-dependent suspension and a twist beam. A twist beam is located in the front of a wheel axle and is subjected to torsional forces, acting as a stabilizer This solution does not generate high production and operating costs. Placing the motors in the wheels deteriorates the ratio of sprung to unsprung masses, which reduces driving comfort
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