In this paper the interior noise level of a vehicle due to structural vibration, named structure borne noise, as a part of NVH analysis has been investigated. First structural analysis is performed and vibrational behavior of structure carried out due to power plant excitations. Then interior acoustic cavity response for such excitation and resultant noise is determined. Vibrational analysis is performed on three dimensional structure and internal cavity, by considering all the effective components and vibrational tracks in the cabin. Finally, the acoustical behavior of the cavity in different frequencies predicted by cavity normal modes, and results are used to reduce noise level through passive noise control methods. Manuscript profile

Increasing current vehicle development trends for small, light, front wheel drive vehicles with low idle speeds have been forced automotive industries to use hydraulic engine mounts for further improvement in vibration, noise and harshness (NVH) performance of the vehicles. However, with the development of modern vehicle designs such as hybrid vehicles and variable engine management systems which have different operational modes, more sophisticated engine mounting systems are required to effectively response to each operational mode. Magnetorheological (MR) engine mount is a semi-active hydraulic engine mount, containing MR fluid, which can alter its dynamic behavior as a result of applying magnetic field. In this paper, design concept of two MR mounts is presented and their dynamic behavior is simulated. It is shown that the simulation methods used in this paper for simulating the dynamic behaviors of the MR mounts are effective with which the dynamic characteristic analysis and design optimization of MR mounts can be performed before its prototype development. Because of increasing demands for semi-active MR mounts in automotive industries, this can ensure their low cost and high quality for development. Manuscript profile

In cold rolling of thin strips, i.e., foils (Thickness<50µm), it is important to take into account the flattening of the roll surfaces. The displacement of the roll surface is obtained by combining some results from the well-known Hertzian theory of contact mechanics and roll-modeling as a system of springs with different spring constants within contact conjunction. Use of lubricants can reduce rolling force and improve surface properties of the foil. Depending on the lubricant properties and rolling speed, either hydrodynamic lubrication or mixed lubrication regimes can prevail. The present theoretical work is focused upon the influence of the rolling-process parameters like rolling speed, reduction ratio, roll surface roughness and lubricant viscosity on the friction coefficient and film thickness in the roll bite in the mixed lubrication regime. Results show that with increase of viscosity, rolling force decreases and film thickness increases. Manuscript profile

This paper investigates the effectiveness of using CVT (Continuous Variable Transmission) in Samand automobile. For this analysis, the conventional Samand and a Samand equipted with CVT are modeled and simulated by using Simulink based software (ADVISOR) and the performances are compared. This analysis includes the effect of driving cycle, fuel consumption and the efficiency of components of the power train. The results show that the fuel economy is increased while using CVT. Finally, the overall cost analysis for incorporating CVT is done and the economical advantage is discussed. Manuscript profile

With due attention to the fact that the local and foreign vehicle industries are changing and modifying the previous designs in order to produce new designs, the components of self-propelled are to be differently analyzed. Static and dynamic analysis is one of them. In this paper, chassis and body of a o-457 bus were studied and analyzed under finite element method (using ANSYS).This process was begun with three dimensional modeling of suspension system, chassis and structure of bus. At first, as an initial stage, a static analysis was performed on the bus to assure the resistance of its chassis. In the next stage, the dynamic analyzed including modal and transient analyses were carried out. In the transient analysis, the symmetric and asymmetric simulations were done in order to test structural resistance and flexibility of the bus. Manuscript profile