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Structural parameter optimization design method for open type TBM

A technology for structural parameters and optimized design, applied in design optimization/simulation, electrical digital data processing, instruments, etc., can solve problems such as complex problems, reduced solution efficiency, model solution efficiency, intuitiveness, practicality, and lack of applicability

Pending Publication Date: 2020-04-14
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At the same time, there are also some technical difficulties in establishing a reasonable model. For example, if there are many factors considered in the modeling, a multi-concentrated parameter and multi-degree-of-freedom model can be established to analyze the dynamic performance of the mechanism, and it can indeed be more accurate. However, there are also the following problems: First, there are many factors to consider, which will make the problem more complicated, which will increase the computational workload and reduce the solution efficiency, which is not conducive to the realization of programming calculations, etc.; secondly, Failure to ignore the influence of secondary factors to the greatest extent will greatly reduce the intuition and practicability of the model. If the model is used to guide the design, it will not be conducive to grasping the key factors, which will lead to the blindness of the design and thus the design efficiency. low; finally, when it is necessary to study the complex nonlinear vibration problem of the mechanism, some nonlinear factors such as clearance and friction must be added on the basis of the existing linear model, then the problem becomes more complicated at this time, if If it cannot be simplified, it may not be possible to obtain accurate convergence results
Scholars currently consider many factors when modeling, and there are many secondary factors among them. Among them, the support-propulsion-step change mechanism dynamics model with four concentrated parameters is the most classic, and it is preliminarily proved by experiments that this model can indeed be more accurate. Describe the dynamic characteristics of the mechanism accurately, but at the same time, there are also the following shortcomings, that is, the model solution efficiency, intuition, practicability and applicability are slightly insufficient

Method used

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  • Structural parameter optimization design method for open type TBM
  • Structural parameter optimization design method for open type TBM
  • Structural parameter optimization design method for open type TBM

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Taking the Robbins M264-311 TBM prototype used in Liaoning Dahuofang water delivery project as an example, its basic parameters are shown in Table 1; the stiffness, size and The inertial parameters are shown in Table 2.

[0104] Table 1

[0105]

[0106] Table 2

[0107]

[0108]

[0109] Taking the parameters given in Table 1 and Table 2 as an example, the first 4 natural frequencies and mode shapes of the mechanism are analyzed by numerical simulation according to the eigenvalue equation, and the results are shown in Table 3 and Figure 3 respectively. In Figure 3, A represents the size of the mode shape vector, and l represents the number of degrees of freedom (generalized coordinates).

[0110] table 3

[0111]

[0112] It can be seen from Fig. 3(a), Fig. 3(b), Fig. 3(c) and Fig. 3(d) that the first four vibration modes of the mechanism are mainly torsional vibration around the z-axis, and vibration along the x, z, and y directions respectively. trans...

Embodiment 2

[0117] The effectiveness analysis of the simplified six-degree-of-freedom dynamics model established in the present invention

[0118] Taking the above TBM model and the parameters given in Table 1 and Table 2 as an example, the finite element model of the support-propulsion-step change mechanism was established by SAMCEF and the modal analysis was carried out to obtain the first four natural frequencies and their modal vibration shapes, respectively. As shown in Table 4 and from Figure 5(a), Figure 5(b), Figure 5(c) and Figure 5(d).

[0119] Table 4

[0120]

[0121] From Figure 5(a), Figure 5(b), Figure 5(c) and Figure 5(d), it can be seen that the first four vibration modes of the mechanism are torsional vibration around the x-axis and translational vibration along z, x, and y, respectively.

[0122] The relative error of the calculated frequency value is shown in Table 5.

[0123] table 5

[0124]

[0125] From Table 5, Fig. 3(a), Fig. 3(b), Fig. 3(c) and Fig. 3(d...

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Abstract

The invention discloses a structural parameter optimization design method for an open type TBM. The method comprises the steps that a six-degree-of-freedom dynamics simplified model of a TBM supporting-propelling-step changing mechanism is established according to the rigidity topological relation between all components of the mechanism; an external excitation load and internal damping of the model are neglected accordingly and an undamped linear free vibration equation of the mechanism is established; the first four orders of natural frequencies and vibration modes of the mechanism are solvedbased on the characteristic value problem of the undamped linear free vibration equation of the mechanism, and the change rule of the natural frequencies along with parameters is simulated and analyzed; and finally the TBM structure parameters are optimized by taking increase of the low-order natural frequency of the mechanism and improvement of the dynamic performance of the mechanism as designobjectives. The method is high in solving efficiency and is beneficial to realizing programming calculation; and secondly, the method can reflect the influence of structural parameters on the dynamiccharacteristics of the mechanism more intuitively and facilitates grasping key points during design and improves the design efficiency.

Description

technical field [0001] The invention relates to the technical field of a full-face rock tunnel boring machine (TBM for short), in particular to a structural parameter optimization design method for an open TBM. Background technique [0002] Full-face rock tunnel boring machines (Tunnel boring machines, TBMs) are widely used in infrastructure construction such as rail transit. The TBM host mainly includes the cutter head drive system and the propulsion system. Among them, the propulsion system is mainly composed of the Gripping-thrusting-regripping mechanism (GTRM), which is the core transmission mechanism for TBM to achieve continuous, efficient and precise excavation operations. It directly affects the tunneling efficiency of the TBM machine. Therefore, it is necessary to establish an accurate dynamic model of TBM support-propulsion-step change mechanism, analyze the dynamic performance of the mechanism and its variation with parameters, and provide a theoretical basis fo...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/20G06F119/14
Inventor 汪菲钟鹏杨玉虎沈兆光胡自昂解然
Owner TIANJIN UNIV
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