Papers by Keyword: Mechanical Model

Abstract: Come up with of pile-soil-(foundation) pile cap interaction grounded upon penetration deformation of pile ends and compression of soil between piles. Hyperbolic model is adopted to simulate the development of tip resistance and side resistance in accordance with deformation to reflect the nonlinearity of pile-soil work, Boussinesq solution is utilized to calculate the stresses generated in soil by foundation (pile cap) plate, Mindlin stress solution is used to calculate the stress produced in the soil between piles by side resistance and end resistance, and the stress of soil is the superposition of the two solutions.

Abstract: An axial symmetry elasticity model of the concrete short column which is pushed out from over-thick steel tube is set up, and the equations of displacement method are derived. The experiment of push-out test of the short column was carried out. On the base of the test, the adhesive thin-layer between the concrete and the over-thick steel tube is introduced. The experimental results show that the shearing stress in the adhesive thin-layer is uniform along the height, which is coincide with the results obtained by the axial symmetry elasticity model of the concrete short column set up in this paper. Therefore, the adhesive shearing stress between steel tube and concrete can be precisely measured by the push-out test of the concrete short column and the relation of shearing stress-shearing strain of the adhesive thin-layer can be determined.

Abstract: The pregnant and sliding mechanism was firstly compared between Vajont and Qianjiangping large rock landslides, which happened in the chair-shaped cataclinal bank slopes. And then the essence of the landslides occurred was deduced. The pregnant and sliding process of the landslides was showed two stages. First, after the first impoundment of the reservoir, the soil and shallow rock at the front of the landslides were slipped and then caused posterior margin of the deep latent sliding surface cracks. So the groundwater supply condition was significantly changed. Second, with the rapidly increase of the groundwater recharge, its pressure on the front of the landslides was also rapidly rise to the critical value which the landslides occurred. Afterwards, the stability mechanical model of the chair-shaped cataclinal bank slopes and critical value formula of the groundwater pressure were established on the basis of the stability mechanical model of general chair-shaped cataclinal slopes, added reservoir water level which was a dynamic load. While working procedures to determine the groundwater pressure was put forward. Last, the theory was certified validity take Liangshuijing rock landslide of the Three Gorges Project area as an example and the monitoring methods and control measures for the landslide were proposed.

Abstract: Aiming at the problem that complex systems mechanical model is difficult to set up and analyze accurately, a certain type of electromagnetic high frequency fatigue tester as engineering background, setting up its mechanical model and carrying on the reasonable simplified. Through analyzing the effect of system mechanical properties causing by system main large stiffness parts, and determining the design principle of the engine's stiffness components, it provides scientific theoretical foundation for the design of this type host.

Abstract: This paper introduces basic working principle of electromagnetic inertial actuators and establishes the mechanical model of actuator. With the method of three-level series permanent magnet, the actuator structure design was completed. According to the structure of the actuator, the magnetic circuit model of actuator was determined, and the design of magnetic circuit was completed. Through the comparison and analysis, the type of both ends of the cage was determined. The simulation analysis of actuators’ magnetic field was studied by using ANSYS, and then the parameters were optimized. The parameters of the optimal solution are concluded, and a way to the actuator parameters is found. This provides a theoretical basis for the production, development of the actuator, and provides a train of thought for the design of the new type of actuators in active vibration control.

Abstract: For the problem of balance bearing of universal spindle in rolling mill being prone to damage, the paper established mechanical model and finite element model of universal spindle. The paper has analyzed that the shear and bending moment in the middle of the shaft is the largest. The fillet near shoulder of balance bearing of the spindle is dangerous part. In order to reduce principal stress of universal spindle caused by moment, the paper improved balance mode of the spindle. The equilibrant was applied from in one place of shaft to put in two places. After optimizing, equivalent stress of the spindle is slight smaller than before under the same loading condition, which illustrates that the strength of the spindle is appropriately improved. Although the effect is not obvious, this has played a guiding role for the optimization of balance mode of universal spindle.

Abstract: Most of traditional manipulator does not meet experimental requirements of micromanipulation for its large structure and complicated driven mode. Comparatively speaking, using actuating and sensing performance of IPMC gripper can well be applied to specific micro operations and mechanical testing environment. This paper designs one kind of IPMC gripper of actuating and sensing performance based on micro operation and micro assembly, which is applied to grab the cells and fix under a microscope.

Abstract: In this paper, the structure, the characteristics and the working principle of vibrating cone crusher with dual exciters were introduced. The hysteretic features of material layers were analyzed. The hysteretic force model with bidirectional symmetrical clearances for the material layer was presented. The mechanical model of two-degree of freedom with bilinear hysteresis and the nonlinear vibration equations of the system were proposed. The equivalent damping and stiffness coefficients of the vibrating system were calculated by asymptotic method. The displacement responses of the system were computed by numerical method and asymptotic method. The results showed that the system responses obtained by an approximate analytical solution were basically identical with the numerical simulation results of the original system.

Abstract: According to the design requirements of the chain conveyor of the material storage and transportation box of automatic loading and unloading vehicle, the 3D and mechanical models of chain conveyor were created. The strength of bearing square tube of chain conveyor was checked base on both models and the result shows that bearing square tube was strong enough and laid the foundation of following chassis structural design. The needed driving force and driving power of chain conveyor were obtained in working condition of full-load unloading transportation and rapid transportation by built calculation model and mechanical formula of the container material loading unit. The maximum driving force and driving power which are 63.25KN and 4.31KW appeared in working condition of full-load unloading transportation and the result provided important basis for the overall design of the automatic loading and unloading vehicle.

Abstract: The movement model of self-adjusting bolt is built in this paper, then the kinematical and mechanical analysis is taken to determine the movement of bolt under the converters working condition.Via the mechanical model analysis of self-adjusting bolts, the load applied to the self-adjusting bolt support including the static weight load of converter and steel liquid, the tilting torque, the dynamic load produced by frequent startup, brake, impact, and the boiling of steel liquid is calculated to determine the distribution of load forcing on the three groups of the self-adjusting bolt. According to the results of stress analysis, the bolt facing tapping hole is the most dangerous when converter tilts 63°. The maximum torque is 281.5101tm.