Novel Glass Laminates for Improved Acoustic Performance 2019-01-0395
Noise, Vibration, and Harshness (NVH) performance of vehicles is an all-encompassing study of hearing and feeling vibration as it relates to end user experience. The collection of glass in a vehicle can represent a large surface area, and can have a significant effect on NVH performance. Some of the most important glazing positions in relationship to the driver are the front doors, due to the proximity to the driver. Novel glass laminate constructions can provide improvement for these body positions over typically used standard glazing constructions. The performance of these new constructions will be discussed in the following terms: acoustics, glass closing, door slam survivability, and solar performance.
Typical glazing configurations for front doors on vehicles are monolithic (single piece of glass) or laminated (two pieces of glass with a resin interlayer) constructions. Laminated constructions utilize constrained layer damping to convert vibrational energy to heat and improve acoustic performance over monoliths. In order to maintain thickness and weight criteria, laminated constructions with more than two plies of glass can provide similar weight and thickness, while offering an improvement in acoustic performance in higher frequencies.
Effectively closing moveable glass for the side window position is necessary in multiple instances. Two instances will be discussed through applying loads in simulations including: closing movable glazings at highway speeds, and closing moveable glazings to seal correctly while the vehicle is not moving. In addition to closing a side window, the load in certain circumstances is applied more quickly. When a door is closed or slammed, survivability must be insured. Simulated closing test results will be discussed, and the probability of failure from door slam simulations will be reviewed for both standard and multi-ply front door constructions.
Lastly, in order to maintain solar performance in comparison with standard baseline constructions, simulations will be done to show how glass composition or coatings can help manage solar performance for multi-ply constructions.
Michael Ulizio, DeWitt Lampman, Chester Walawender, Sanjay Abhyankar