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Gas insulated switchgear (GIS) is widely used for its good economic benefits. But mechanical faults caused by electromagnetic force occur occasionally. The conducting wire and the metal shell are exposed in the alternating electromagnetic field, which is caused by the load current and vortex. This leads to electromagnetic force because of electromagnetic induction. So it is necessary to analyze the...
Precision centrifuge is an important test equipment in inertial navigation. In this paper, the problem of the accuracy of 2-DOF precision centrifuge is investigated and the unbalance balancing problem is completed while the precision centrifuge rotor unbalance exists. Firstly, based on the institutional arrangements of precision balancing centrifuge system, the existing forms of the unbalance of the...
Cartridge flow valves, widely applied in heavy machine and equipment, have the advantages of low leakage, large flow capacity, and simple structure. However, in the existence technologies, in order to reduce the influence of load variety on valve flow, a pressure differential compensator or a cartridge type flow sensor should be added to proportional throttle valve. This method reduces valve flow...
That recent years in China found a spate of 6 accidents of bridge collapse due to failure of suspenders arouses reflection of the industry. But the existing suspender models in researches are either too simple and rough or too complicated and inefficient. This paper therefore presents a support spring model based on a real bridge. The model is then applied to an actual bridge to analyze the impact...
Screw-driven clamping fixture, it's external or internal force and deformation may be the direct cause of manufacturing precision, is one of absolutely necessary parts for manufacturing process. An effective way of predicting the movement and force of the screw-driven clamping is proposed in this paper based on mathematical methods and numerical simulation. As an example, a kind of screw-driven fixture...
The research of load distribution is not only an important part of bearing theory but the basis of studying the other performance indicators of bearings as well. Based on the contact theory of Hertz, the relation of geometric deformation of slewing bearing under certain loads is analyzed, and an analytical formula of load distribution for the slewing bearing under the action of radial force, axial...
To meet the needs of rapidly changing roll. A factory cold rolling mill uses sliding type for Roll changing car to replacement of rolling mill roll. If the lack of stiffness in the work, Roll changing car often occurs deviation in working, Led to the replacement roll can not into the rolling mill, changing roll time can be extended. In order to get the displacement and stress distribution of frame,...
The necessity of developing an automatic high performance exertion system for the type approval test of tank GCS is expounded. The composition and working principle of exertion system are introduced. Studies on exertion security and non-overshot exertion control performance are carried on using simulator and simulation methods, which draw the conclusion that control method using shift and force bi-closed-loop...
Due to the ignorance of the instability of hydraulic cartridge sequence valve and the resulting accidents, this paper presents stability analysis of the cartridge sequence valve. First, the operation of the valve was illustrated, then a theoretical analysis was given, and simulation under AMESim environment was carried out, hence the variations of the control variables during the dynamic process were...
In this paper, the models of the base of a type vertical motor were adopted to MSC. NASTRAN software to analysis modes and transient response, get transient response, natural frequencies and vibration shape based on element finite simulation, and the mechanics capability was proved, these main destroy forms and locations were gained. The effect of the vibration of the motor was also discussed according...
The superfluous force seriously affects the dynamic load precision of the electro-hydraulic load simulator. Aiming at this question, the work principle of the electro-hydraulic load simulator was analyzed, and the bond graph models of the flow servo valve, hydraulic cylinder and load were established. These models sufficiently contain the higher-order nonlinear dynamic character of the electro-hydraulic...
In the paper, the characteristics of mode and harmonic response of the axis of the high-speed motorized spindle are presented with the FEM (Finite Element Method). A dual-dimension model with the FEM is developed and simulated using ANSYS commercial software. The result shows that the rated rotating speed of the high-speed motorized spindle is far smaller than the first-order natural resonance speed,...
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