Description

12004-102-01 VPS BOARD VER.C

The system adopts the influence coefficient method to process the data of dynamic balance testing, improving testing efficiency and eliminating the influence of system factors. By using methods such as fitting and interpolation, strict synchronization of each signal period and sampling point is achieved, and the corresponding points of each period are averaged to obtain data samples to filter out non periodic signals and ensure the accuracy of dynamic balance phase testing. Using harmonic analysis method, filter out all harmonics except for the fundamental wave to ensure the accuracy of the original dynamic balance data and improve the accuracy of dynamic balance amplitude testing, as shown in Figure 4. The imbalance obtained from the dynamic balance test must be corrected and eliminated. It can be achieved by adding or subtracting some of the mass, that is, increasing or removing weight. Based on the special situation of the general gasoline engine crankshaft, this system adopts the weight removal method, which is achieved by drilling holes on the two sector surfaces of the crankshaft. 3.2 Design of automatic weight removal algorithm This algorithm determines the effectiveness of dynamic balance correction and directly affects the efficiency and accuracy of weight removal. Due to the unique nature of crankshaft components, weight removal can only be carried out at specific locations. This system adopts the method of drilling multiple holes at a fixed angle on the sector surface and achieving the goal of balance correction through vector synthesis. The drilling depth algorithm for each hole is as follows: Set the imbalance of the i-th calibration face: U0i (unit: g.mm) 90i (unit:), the maximum drilling depth h0 (unit: mm), and the material density of the measured workpiece ρ Unit: g/cm3, radius of correction face: R0 (unit: mm), drilling diameter: d0 (unit: mm), drilling tip angle: 1 α (Unit.), n is the final number of boreholes, as shown in Figure 5. The volume of the front tapered hole is:

MHD093C-035-PP0-BN
MHD093B-058-NP0-BN
MHD093B-058-PP1-BN
MHD093B-058-PP0-BN
MHD093C-035-NP1-AN
MHD093C-058-NP0-BN
MHD093C-058-NP0-AN
MHD093C-058-NP1-AN
MHD093C-035-PG0-AN
MHD093C-058-PP0-AN
MHD093B-058-NP0-AN
MHD093C-058-NG1-AN
MHD093B-035-NP1-BN
MHD093B-035-NG0-BN