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40t m door design of the hand calculation and Machine Operators


. O0. O20.020.02 error (%) All of the load 5.24.75. O0.020.020.02 heavy Technology Review 1990 * * 302, the overall structure of the half-door of the structure calculation diagram, as shown in Figure 4 Figure 4 in accordance with the structural mechanics, this is a space 24 times just statically indeterminate frame structure, whether by force method, displacement method or the moment distribution method, hand-counted very complicated and difficult, so that no one was willing to count on such a diagram. * Using the finite element method can solve this problem, the finite element diagram shown in Figure 5. 3 ● 4, Figure 5, this diagram of the CPC by 54 nodes, 53 beam elements of space and 4 boundary elements, which 39,33,3 l, 29,24 and in Figure 3 nodes 1,2,3,4 , 5 the same node location. In order to compare with the single beam, the finite element machine count results 33,3 l, 29 calculated the three wrapped 2 displacement (mm) STRESS (N / mm) Z direction of linear displacement 3l node 29 node 33 node 33 node 3l nodes 29 nodes 12.8013.6012.3882.1376.9370.97 the displacement and stress conditions (just to name a line of Z direction shift), are listed in Table 2. Third, the results of analysis and conclusions from Table I, we can clearly see, the use of linear elastic structure theory of the hand calculation and finite element method program the results are basically the same machine operators, especially in stress, support reaction force, weight of the structure is almost equal. Calculation in the displacement slightly different, but the difference is about 5%, which is allowed in the project. Caused some differences due to the finite element method is a numerical method, use it to solve, the solution accuracy by the computer word length limit and linear equations such as accuracy of solution, can be seen from the above,[link widoczny dla zalogowanych], then the amount is approximate solution, but in engineering can meet the requirement. The overall structural analysis, from Table 2, we can see, considering the door legs and so on, some of the main beam on the beam to withstand a certain degree of bending, thus reducing the span ● ● '● t6 so I Technical Guidelines Report 1990 · № · 3 of the moment values, [1, P561]. This makes the beam 33,3 l, 29 nodes in the displacement and stress are all smaller than the primary beam as the beam tube the result of calculation, which also proves that the main beam computed as the simple beam safer side. Through effective finite element analysis, can be designed to modify the design as a reference for further structural design of more good to meet performance and economic requirements. To further validate the finite element method, the unit, how much whether the impact on the calculation results, we have the finite element model in Figure 3 changes into a finite element model of Figure 6. Figure 6 and the end result is much more and nothing less. See the finite element from the flexible, convenient, can be calculated with the requirements of those who set the nodes and elements to achieve the required parts to understand the situation. Through the above calculation and analysis,[link widoczny dla zalogowanych], the following conclusions: 1, based on the theory of linear elastic structure of the hand calculation and finite element method based program between the results of machine the same foot,[link widoczny dla zalogowanych], as long as the calculation diagram is reasonable, the results of full finite element method reliable. 2, the use of finite element method,[link widoczny dla zalogowanych], can handle difficult to calculate by hand, the problem can not be calculated, and the high efficiency of machine operator, effort to save time, we should vigorously promote the use of structural design. 3, the designer should master the theory and the finite element program, making the structure design and calculation of an effective tool to improve our design capabilities. In Figure 3, based on an increase of 6 nodes and 6 units, and other conditions are not changed. After calculation, 4 reference nodes all cases 6,8 and Figure 3 『{: 2,3, [1]\This means that the unit Press, 1980, thermal expansion coefficient of multiple system calculated at the Taiyuan Heavy Machinery wide smithery wide Wei Zhe Abstract Multi systems derived ideal formula of coefficient of thermal expansion, a number of alloy systems were verified, confirmed the formula is reasonable. I. Introduction phenomenon is a natural law of thermal expansion and contraction of human life and have a wide range of production. We used all kinds of very different thermal expansion properties. Identified as projects with the structure must take into account the tolerance allowed by the different thermal expansion coefficients. Therefore, to understand and study the performance of thermal expansion, is the indispensable materials science topics. Establishment of thermal expansion of this discipline on an experimental basis, with the rapid development of modern science and technology, measuring thermal expansion coefficient method more accurate. But in the experiment towels,[link widoczny dla zalogowanych], inevitably will be the interference of the relevant factors, to measure with

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