Holon3d engineers used the camera-based 3D scanner "HL-3DS+" to scan the suspension of the car for a team in Guangdong International Circuit. The customer needs to use the high-precision 3D data obtained by the scan to debug the suspension system of the car, so that the car can show excellent performance in the competition .
Practical problems
The suspension system is one of the most difficult parts to scan in the entire vehicle. It has a complex structure, fine parts, and many dead spots.
The customer requested that the four suspension systems of the car should be on the same coordinate.
Holon solutions
The racing suspension system refers to the entire support system composed of springs and shock absorbers between the body and the tires. It has the function of supporting the body and improving the ride feeling. Different suspension settings will bring different driving experience to the driver. The seemingly simple suspension system actually combines a variety of forces to determine the stability, comfort and safety of the car. It is one of the most critical components in the entire car.
A team in Guangdong International Circuit hopes to analyze the suspension system of the car through three-dimensional data. With accurate 3D data, the debugging of the car will be more scientific. After the Hualang engineer with rich scanning experience in the automotive industry arrived at the scanning site, according to the characteristics of the car, the scanning plan was quickly formulated and the scanning work was completed, which met the customer's needs.
Car chassis with marking points, coding points and target rods placed
Customer requirements: 1. It is necessary to obtain the data of the automobile suspension system, especially the shock absorber and the swing arm, as well as the precise position of the screw holes on the sheet metal parts.
2. The four suspension systems need to be on the same coordinate.
Equipment used: 3D scanner "HL-3DS+", 3D photogrammetric system "HL-3DP".
Total time: 4.5 hours
Scanning result: one time success, accuracy 0.06mm.
Holon3d engineers are using the photogrammetric system to obtain code point coordinate information
Scanning steps:
1. Use 3D photogrammetry system:
The technology of many ordinary 3D scanner manufacturers only stays at the level of whether the object can be scanned completely. Faced with the problem of scanning four suspension systems and ensuring that they are on the same coordinate, the data connected to the target area is generally scanned for transition, such as scanning the transmission shaft to associate the front and rear suspension systems. And Hualang engineers used the 3D photogrammetry system HL-3DP, first quickly record the position information of all code points and mark points before scanning. For every piece of data scanned by the scanner, the 3D photogrammetry system will automatically place it in On the corresponding coordinates, this not only does not require scanning transitional objects, but also reduces the number of scans and reduces errors caused by stitching. The yellow rod in the picture is a heat-resistant deformation alloy target rod. Each target rod has been tested and certified by an authoritative organization. It will play a role of scale in the photogrammetry process, providing more guarantee for high-precision three-dimensional data acquisition. .
Holon3d engineers are using a 3D scanner to scan the suspension system of the racing car
2. Three-dimensional scanning
HL-3DS+ is an industrial-grade camera-type 3D scanner, with a single frame accuracy of 0.02mm and photogrammetry up to 0.05mm/4m. It uses a military carbon fiber frame, a 17-digit ring code calibration system, and 13-step orientation calibration. Multiple technologies such as automatic splicing of marker points ensure high-precision 3D data of the car suspension, guarantee the performance of the car, and protect the life safety of the driver. During the scanning process, Hualang engineers moved and raised the tripod flexibly, manipulated the pan-tilt to change the angle of the three-dimensional scanner to avoid scanning blind spots, and completed the scanning of more than 60 pieces of data at one time. Frequent mobilization of the fuselage, scanning and stitching of more formats are one of the ways to test the stability of a set of 3D scanners. However, when consumers buy 3D scanners, it is easy to overlook the problem of equipment stability. Then the scanning software that comes with HL-3DS+ began to process the 3D data, automatically splicing, and automatically delete duplicate data. A point cloud data is generated in less than 10 minutes, and customers can convert to STL/IGS/PLY/ASC/CAD and other formats according to their needs.
Overall 3D data of racing suspension system (STL format)
3D data of the left front suspension of the car
Bottom view of 3D data of rear suspension of racing car
Partial 3D data of racing car rear suspension system