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This paper presents a method applied in the development of an optimized transmission rubber mount of a midsize Diesel pickup. The focus of this optimization were to improve the vibration insulation and consequently improve the NVH (Noise and Vibration Harshness) quality of the vehicle. The paper describes the basic mounting design and manufacturing constrains, the simulation modeling basis, inputs required to perform the computational simulation, the experimental method used to extract the center of gravity and rotational inertia of the powertrain and a general mounting tuning strategy. The mounting dynamic simulation results for the optimized version is also presented compared to the original one. In order to quantify the noise and vibration improvements, the internal noise and vibration transmissibility levels were measured and compared in percentile reduction basis to current vehicle levels

The Noise and Vibration Harshness (NVH) quality is an important customer and benchmark requirement in automotive industry products. The NVH improvement, applied in new projects, is a compromise of cost, performance and time to launch new products. The later trend has been minimized with efforts of computational simulation in the design verification phase. A precise method used for the determination of mass, center of gravity and rotational inertia, allows the engineer to simulate virtual arrangement of mounts before building prototypes. This dynamic simulation of the power train assembly extracts the first six natural frequencies and could be used for mode decoupling. All this systematic evaluations must comply with customers and design requirements. This paper describes the steps of mounting mechanical properties determination and summarizes the main tests used for evaluation of durability, certification and NVH characteristics.