Model-in-loop development and experimental assessments on noise and vibration effects for Hybrid powertrain.

The increasing use of virtual technology is considered as a great support for the real world in terms of developing and analyzing for the better products. Moreover today for finer vehicle’s in the automotive industry, the simulation platform is the base of research and development phase. Universally industries use various modelling approach for better understanding and further explore in the automotive systems. However, there are different vehicle classification within industry and one of the leading vehicle system configuration is Hybrid Electric Vehicle (HEV), which has by far shown a great attraction overall. The following thesis presents the analysis effort made within the simulation methods and models to further investigate the noise and vibration effects for hybrid powertrain. During the complete research work, three major assessments were carried out: 1. The first computational model represents the co-simulation of complete vehicle, where multi-physics simulation approach is carried out to principally understand the noise and vibration effect for hybrid powertrain. A special emphasis is made on combining simulation methods and models for achieving non-stationary conditions, where the requirement is for complete vehicle model. 2. The second model concentrates on evaluation of seat vibration with respect to human perception and based on the transient operating conditions, i.e. specifically focus on start-stop systems of micro / mild hybrid powertrain. A detailed analysis model was build to study the starting behaviour of hybrid configuration named - Crankshaft Starter Generator (CSG) and further understand its effects on human factors. 3. The third and final model deals with interpretation of earlier research work i.e. combining the complete vehicle model and start-stop system to simulate the complex transient events in a driveline. Furthermore the simulation model is more focused on the operation based, where stop and go scenario is analyzed with its effects on transmission dynamics. The prime target for this research is to elaborate and define the modelling approaches and methods for electro-hybrid powertrains and their incorporation in simulation software. However, these multi-physics simulation models are used to investigate different types of applications and to further analyse the noise and vibration effects for transient operating conditions. Moreover, the outcomes of the research work have achieved a thorough study and analysis of noise and vibration effects (N&V) for the dynamic conditions of electro-hybrid vehicle powertrain. In addition to it for the future aspects, this work can be used to optimize and test the profound models with the real world application and validate with measured data to scrutinize noise and vibration effects of hybrid powertrain.