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120T / H boiling cooling bed structure of the dynamic characteristics of


But the main work is the vibration bed type work. Fourth-order vibration mode that is almost on the tank and the bottom beam as a whole, around the y-axis for the torsional vibration, the sand transport disadvantage, because the fourth-order natural frequency of the resonance frequencies are 9.521-Iz, so great harm . Fifth-order modes that are on the slot and the end of beam torsional vibration around the x-axis occurs, transport of sand on the negative, because the fifth-order natural frequency of l6.7 outer edge of the resonance region, so the work on the cooling bed, there are a number of . Direction before the die casting sand bottom tank pull one hundred and eleven floor beam of a ... ... ... ... ... at the end of a third-order beam wander pull bottom end of the second beam = Die;: = ~ A ==: A / / Figure 2 slot backplane and bottom beam 3, the first five vibration modes because of the cooling bed Sand fifth order vibration mode analysis shows that the sand accumulated in the bed, the end is inevitable in the design of the cooling bed, that the sand thickness is a uniform distribution Ideal situation: According to maintenance workers, operatives reflected. The actual thickness of the sand higher than the original design value is calculated as the amount of sand transport Q = t: 31p, when the amount of sand transported Q, sand density P, bed width B is constant, the increase in sand thickness will inevitably lead to transmission speed decreases. Material handling speed is reduced, the body Sand bed will increase the cooling bed natural frequency deviation from the original design value, a 244 bed Taiyuan Heavy Machinery Institute amplitudes of 1999, resulting in decreased amount of transported sand, more sand retention, caused further increase the quality of the bed, so the natural frequency and the greater the deviation from the original design value, resulting in excessive over bed Sand,[link widoczny dla zalogowanych], crushed to death bed, no vibration. 4 Reconstruction Design of the initial program known by the above analysis, since the original design of the uniform thickness of sand layer is assumed, resulting in structures with local design is unreasonable, therefore, should first be based on actual, proper simulation of accretion on the sieve distribution. Then using dynamic optimization methods or modify the method of dynamic structure of the cooling bed to redesign some components to ensure that the work of the third-order modes corresponding to the natural frequency with the design value as far away from resonance. Large complex structure cooling bed, the main part of the bed, bottom beam shape and quality are not easy to change, if the resonance through the debugging in a good spring so that the mechanical structure of the state, then both convenient and economical to implement. In fact, installed in the structure of components such as springs in large part controls the structure of the main modes. Therefore, the resonance spring cut the body, as a re-design the layout and the number of variables is a reasonable choice. Spring layout and the number of resonance changes, you must cause the whole structure of the finite element network changes, this calculation when the dynamic characteristics of the cooling bed,[link widoczny dla zalogowanych], although the interface can be connected substructure fixed mode synthesis method, but it needs to structure A and sub-structure pairs c re-calculated and integrated. If only the degree of re-election cut design variables, the substructure with fixed interface connection mode synthesis method to calculate dynamic characteristics, simply connected sub-structure of the information in the modified B adjourned to count, because consolidated small, so moving Characteristics of a time can be greatly reduced. Thus, structural dynamic optimization and structural changes in local parameters to calculate the dynamic characteristics will significantly improve the computational efficiency. Through the above analysis, the preliminary design of the cooling bed the following program of reform: dynamic optimization using dynamic modification method or spring rigidity of the resonance re-designed to ensure that the work of the third-order modes corresponding to the natural frequency as close as possible with the original design value, the corresponding work modes rather than two, four natural frequencies far away from resonance. Calculation of the dynamic characteristics of which can be connected substructure fixed interface modal synthesis method. References: 1] Liang fragrance, Baishang Wang and other dynamic characteristics of the cooling bed model of Taiyuan Heavy Machinery Institute,[link widoczny dla zalogowanych], 1996,17 (4): 294 ~ 297:2 Department of Engineering Mechanics, Xi'an Jiaotong University boiling cooling bed transformation group on I20T / H boiling cooling bed assessment and preliminary report of amendments 1988,1 ~ 2:3] complex fragrance resonant beam optimal design and its 120T / H boiling cooling bed Structures;: Dissertation]. Xi'an: Xi'an Jiaotong University, Civil Engineering and Mechanics Institute, 19954] Liu Xiaojian, complex dynamic optimization; [Ph.D. Thesis, Dalian: Dalian University of Technology,[link widoczny dla zalogowanych], 1988DynamicCharcteristicsAnalysisforthe120T/HBoiling--coolingLatheLiangQingxiangBaiShangwangNieYuntu (TaiyuanHea ~, 3'MachInst, Taiyuan0300241WangGuilian (TaiyuanHeavyMachineryGroup (, Taiyuan030024) (continued on page 256)

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