Shulou(Shulou.com)11/24 Report--

As the saying goes, details determine success or failure. With the increasing experience of end users, more and more details that are easy to ignore in the past have gradually become the key factors to build the car experience, such as the acoustics of the door system, that is, NVH performance.

NVH consists of three parts: noise (N), vibration (V) and ride comfort (H). If Maslow's demand theory is used to compare the door NVH demand, it is not difficult to find that from the early basic needs such as vibration and noise reduction and noise elimination to the pursuit of high-order requirements such as stillness and quality, the door module design is moving towards the "pyramid tip".

Bozer, who has 35 years of development experience in the door module field, has a keen insight into the emerging new needs of users in the door acoustic experience, continuously optimizes the door NVH and redefines the door "texture".

Basic logic: improving the acoustic texture of car doors from three scenes

With the penetration of intelligence and electrification, the attribute of automobile "third space" is gradually enhanced. In particular, with the upgrading of automobile consumption, users' pursuit of functionality has tended to the extreme, and the future will pay more attention to the improvement of comfort. The proportion of NVH in automobile research and development is becoming more and more prominent.

The main goal of door NVH design, which is closely related to user experience, is to improve the comfort of drivers. In the whole process of driving, opening and closing windows, driving and playing music are the three major application scenarios to measure the performance of car door NVH. How to improve the NVH performance in three application scenarios and upgrade the acoustic texture requirements from basic to high-level, the following aspects of door design are the key:

Glass rise and fall: improve the noise caused by glass rise and fall, and optimize structural vibration

Stillness: by improving sound insulation and vibration isolation, reducing two-way radiation of sound inside and outside the car, maximizing the protection of user privacy, and creating a quiet environment to improve the comfort of the car.

Quality: provide low distortion sound signal, significantly improve the sound quality, especially the middle and low frequency performance.

Reduce complexity to simplicity: quantify subjective feelings into specific indicators

People are perceptual, and their auditory and tactile sensitivities are different. Therefore, the user's feeling for the door acoustics NVH is also thousands of people. The primary design goal of the Bozemen module R & D team is to quantify this subjective feeling into specific indicators.

Specifically, as the two most important indicators of NVH, sound source and transmission path are the top priority to improve the door NVH.

In the door module, the sound source refers to the motor, assembly, mechanical moving parts and so on. Take Boze's window glass elevator motor as an example, the motor is bound to produce sound and vibration in the process of operation, and unoptimized sound and vibration will bring users an unpleasant experience. To this end, Bozer carries out a large number of NVH tests on the elevator motor, constantly adjusting the key parameters, and improving the structural characteristics of the sound source, so as to optimize the NVH performance of the elevator motor.

The transmission path mainly depends on the structural design and material selection of the door module. by making efforts in these two aspects, we can effectively reduce the transmission of noise and vibration and optimize the auditory and tactile experience.

In the structural design of the door module, Bozer added a structure similar to a "firewall" in the cavity, effectively isolating the interference of the noise outside the car to the users in the car, and at the same time, the music or conversation played by the users in the car will not be transmitted to the outside of the car. The function of "firewall" is to reduce the two-way radiation inside and outside the car.

In terms of material improvement, compared with metal, plastic is more effective in reducing noise and vibration. To this end, Boze further, in the new generation of door modules in the use of uninterrupted glass reinforced thermoplastic composites, to achieve a significant improvement in door stillness.

Core idea: have a beginning and an end, and know the root of it.

In view of the NVH problems in different application scenarios, Bozer's door module team strives for excellence in each process of the whole life cycle of the door, and forms a set of efficient development process. Summarize the core concept of Boze door NVH design, can be summarized into eight words: from the beginning to the end, know the root.

From product design to final delivery, Bozer follows the whole process management of "from beginning to end".

"beginning" means that in the early stage of research and development, Bozer builds a reliable model to predict the performance of the entire door module on customer models, and then decides from which key paths and directions to optimize product performance in order to meet the requirements of mass production and delivery. minimize late problems and design changes as well as repeated experiments to save customers the development cycle and cost.

"have an end" means that in the face of diversified customer needs, Boze can identify the main contribution of NVH and control the key factors of the production process related to the main contribution to ensure that the NVH level of the products delivered after delivery is qualified and stable for a long time. In this process, the production team will also strictly check.

In the face of complex NVH problems, Boze relies on profound technical reserves and experience accumulation to achieve "know the root".

When a problem arises, Bozer can find out the root of the problem as soon as possible, that is, "knowledge root". Based on the design input and design goal, Bozer will constantly optimize the structure and critical delivery path based on the prediction model in the middle of the design; before mass production, Bozer will also review the design and the actual sample to evaluate the impact of various deviations on the design goal and the main cause of the locking problem.

In the design and testing process, Boze has a complete set of "white paper", that is, "knowing the bottom", which quantifies the acoustic performance through the prediction of the model, and assists the designer in determining the upper limit of the relevant parameters and evaluating the limit samples in the design and testing stage. in order to determine the limit performance of the design and the actual parts.

It is particularly worth mentioning that, based on global R & D experience and local development cases, Boze's door R & D team is constantly upgrading the development process, optimizing the factor library and design models related to NVH development, so as to improve the future door acoustics development.

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