【Jiaqin Comment】Geely's vehicle smoothness analysis scheme can quickly obtain the analysis results by entering the vehicle parameters of the vehicle to be analyzed into the vehicle smoothness analysis model for online smoothness analysis. It not only improves the speed of vehicle smoothness analysis, but also improves the popularity and intelligence of the analysis.
According to the micro-network news, vehicle smoothness refers to the performance of the vehicle to resist the vibration and shock generated during the driving process, and is also one of the main indicators to ensure that the driver and occupants will not cause discomfort and fatigue due to body vibration and shock, the performance of keeping the goods transported intact and the comfort of the whole vehicle. Therefore, in vehicle design, especially in suspension design, the first task is to ensure that the vehicle has good vehicle smoothness.
Prior art mostly through complex theoretical analysis, multibody dynamics analysis and real vehicle testing to obtain the main parameters used to measure the smoothness of the vehicle, however, in the implementation process, when the engineer optimizes the design of the controlled system and components, it is impossible to timely confirm which part of the controlled system or components affects the smoothness.
This process often requires a lot of theoretical calculations, multibody analysis, and real vehicle testing, which not only increases additional economic expenses, but also has a long response cycle. At the same time, due to various objective reasons, there is a possibility of inconsistent results, which will affect judgment. To this end, in order to facilitate and quickly analyze the online smoothness of the vehicle, Geely applied for an invention patent entitled "Vehicle Smoothness Analysis Method, Device, Equipment and Storage Medium" on October 21, 2021 (application number: 202111230983.4), and the applicant was Zhejiang Geely Holding Group Co., Ltd.
According to the relevant information currently published in the patent, let's take a look at this technical solution.
As shown in the figure above, it is a schematic diagram of the process of the vehicle ride analysis method invented in the patent, first, the system needs to obtain the vehicle parameters of the vehicle to be analyzed, including spring mass, non-spring mass, spring stiffness, tire stiffness, shock absorber damping and impact load. Among them, the parts that can move with the wheels belong to the non-reed mass, while the parts that can only remain relatively stationary with the body belong to the spring mass, and the impact load f can be understood as the force in the vertical upward direction generated by the impact of the road surface and so on.
Secondly, these parameters of the vehicle are input to the preset vehicle ride analysis model for online ride analysis, so as to obtain the ride parameters, which are mainly based on the spring mass mechanical relationship and non-spring mass mechanical relationship of the car body, for example, in the following figure, the schematic diagram of 1/4 of the body vibration of this vehicle ride analysis method:
It can be seen that the vertical upward direction is the positive direction, and the mechanical relationship of the spring load mass in the vehicle is: Msas =f–Cs(Vs Vu)–Ks(Xs Xu), where Ms is the spring load mass, as the spring load acceleration, f is the impact load, Cs is the damper damping, Vs is the spring load speed, Vu is the non-spring mass speed, Ks is the spring stiffness, Xs is the spring mass displacement, and Xu is the non-spring load mass displacement.
The mechanical relationship of non-reed mass can be expressed as: Muau =Cs(Vs Vu) + Ks(Xs Xu)–Kt(Xu Xg), Mu is a non-reed mass, au is a non-reed mass acceleration, and Xg is a road surface excitation displacement.
Finally, according to the obtained smoothness parameters, the smoothness analysis results of the vehicle to be analyzed can be determined, in addition, in order to improve the popularity of this online analysis system, the smoothness analysis results of the vehicle to be analyzed can also be stored in the relevant database, and the user can query in the database after passing the authentication.
Finally, as shown above, for the structure of the vehicle smoothness analysis device schematic diagram, which mainly includes the processor 1001, communication bus 1002, user interface 1003, network structure 1004 and memory 1005, etc., in the memory, stored in the relevant content of the above analysis module, including: operating system, network communication module, user interface module and vehicle smoothness online analysis program.
The above is the vehicle ride analysis method invented by Geely, which can quickly obtain the ride analysis results by entering the vehicle parameters of the vehicle to be analyzed into the vehicle ride analysis model for online ride analysis. It not only improves the speed of vehicle ride analysis, realizes the smoothness analysis of vehicles conveniently and quickly, but also improves the popularity and intelligence of vehicle ride analysis.