Research and Analysis on Improved Design of Vehicle Spring Support
Optimizing the position of the gas spring support is crucial for maximizing its performance, based on the structural characteristics of the gas spring. The working stroke and the supporting force are two key parameters that determine the functionality of the gas spring. To address this, this paper presents a VB-based system designed to optimize the layout of the gas spring support for passenger doors. This system allows users to input necessary structural parameters through an interactive interface, after which it calculates the optimal position of the fixed support and corresponding gas spring parameters. The core idea of the optimization process is as follows: the user provides initial gas spring parameters and the possible range for the support location. The system then automatically determines the actual required support force (FS) across the entire working stroke and the actual support force provided by the gas spring (FN). The bearing coordinate that minimizes 2(FS - FN) over the entire stroke is considered the optimal one. The mathematical model used in the optimization defines the coordinates of point O3 in the XOY coordinate system as the design variables, i.e., x = [x1, x2] = [x, y]. The objective function is f(x1, x2) = 2(FS - FN), subject to constraints such as l1 ≤ Fx1 ≤ l2; l3 ≤ Fx2 ≤ l4; F1min ≤ F ≤ F1max; F2min ≤ F ≤ F2max; and Lmax - Lmin ≤ FLxc. Here, l1, l2, l3, and l4 represent the range of support positions input by the user; Fmax and Fmin denote the maximum and minimum supporting forces of the initially selected gas spring; and Lxc represents the working stroke of the primary gas spring. When the coordinates of O3 are set at x0 = -100 mm, y0 = 490 mm, the gas spring's working stroke is Lmax - Lmin = 187.3 mm, with a maximum supporting force of Fmax = 2831.8 N and a minimum of Fmin = 215.3 N, resulting in 2(FS - FN) = 29679 N. The gas spring’s force function is linear. After inputting these structural parameters into the optimization software, the initial gas spring parameters were set as Fmax = 3000 N, Fmin = 500 N, Lxc = 190 mm, and Lmax = 570 mm. The optimized coordinates of O3 were found to be x0 = -52 mm, y0 = 509 mm, within the range of x0 = (-50 to -150) mm and y0 = (450 to 550) mm. At this point, the working stroke became Lmax - Lmin = 176 mm, with Fmax = 2006 N and Fmin = 158 N, resulting in 2(FS - FN) = 26188 N. This represents an 11.8% reduction compared to the initial empirical positioning. This example demonstrates how using the optimization software significantly reduces the force required to open the door, enhancing the ease of use and portability of the door mechanism. Additionally, the software enables designers to easily evaluate and select appropriate gas springs, providing a solid theoretical foundation for their design choices. By automating the optimization process, the system not only improves efficiency but also ensures more accurate and reliable results, making it a valuable tool in the development of automotive door systems. Vegetable Seedlings Led Grow Light
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