A low-noise design method for engine plastic parts
A design method and component technology, applied in design optimization/simulation, calculation, instruments, etc., can solve problems such as large error in results, inability to obtain component performance analysis results, errors, etc., and achieve the effect of improving accuracy
Active Publication Date: 2019-02-26
TIANJIN UNIV
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[0002] Engine plastic parts play an important role in engine noise reduction due to their excellent damping properties. Fiber-reinforced plastics are mostly used in engine plastic parts to ensure that plastic parts have sufficient strength. The mechanical properties of fiber-reinforced plastics vary with fiber Therefore, different results will be obtained in static analysis and dynamic response calculation based on isotropic material model and anisotropic material model, and there are certain differences, which means that based on each The calculation results of the isotropic material model will lead to obvious errors, especially for some thin-plate parts with large areas, the result error will be greater, so that not only can not get the correct performance analysis results of parts, but will also affect the subsequent optimization. The design is misleading, therefore, proposing a low-noise design method for engine plastic parts is of great significance to the low-noise design of the engine
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[0028] According to the fiber orientation results of the plastic oil cooling cover, the finite element model can be divided into 12 groups, including a total of 52 blocks, such as figure 2 As shown; different blocks in the same group have the same fiber orientation and the same color, and the fiber orientation of different blocks is defined by using the local coordinate system. In the simulation calculation, the bolt hole position of the plastic oil cooler cover Six degrees of freedom are constrained.
[0029] In order to compare the difference in modal characteristics between the isotropic material model and the anisotropic material model, free modal simulation analysis was carried out on the plastic oil cooler cover of the two models; The accuracy of the characterization modeling and simulation method, tested in a modal test on a plastic oil cooler cover;
[0030] The results of the calculated free modal frequencies and experimental modal frequencies of the isotropic and a...
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The invention relates to a low noise design method of engine plastics parts and components. The method comprises the steps of building an injection moulding model, wherein a pouring gate location is in the middle part, a flow direction of a fiber is from left to right, so that two different sample pieces with one in the fiber direction and the other one in the direction vertical to the fiber direction are thus obtained; conducting tensile tests on the established sample pieces in different directions, and obtaining elastic moduluses in the fiber direction and the direction vertical to the fiber direction respectively; constructing elastic constitutive equations of anisotropic materials; mapping surface vibration response results of the plastics parts and components to an acoustic envelope grid, conducting acoustic boundary element calculation, and obtaining radiation noise amplitude of the plastics parts and components; analyzing noise peak frequency according to the result of the radiation noise, finding out a modality order closest to the peak frequency by calculating constrained modality of the engine plastics parts and components, using the modality order as an optimization object, changing structures to improve modal frequency of the modality order, avoiding resonant frequency and lowering the radiation noise.
Description
technical field [0001] The invention relates to a low-noise design method for engine plastic parts. Background technique [0002] Engine plastic parts play an important role in engine noise reduction due to their excellent damping properties. Fiber-reinforced plastics are mostly used in engine plastic parts to ensure that plastic parts have sufficient strength. The mechanical properties of fiber-reinforced plastics vary with fiber Therefore, different results will be obtained in static analysis and dynamic response calculation based on isotropic material model and anisotropic material model, and there are certain differences, which means that based on each The calculation results of the isotropic material model will lead to obvious errors, especially for some thin-plate parts with large areas, the result error will be greater, so that not only can not get the correct performance analysis results of parts, but will also affect the subsequent optimization. The design is misle...
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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 王健张俊红
Owner TIANJIN UNIV