Papers by Keyword: Displacement Response

Abstract: The paper uses modern control theory and mechanical and structural vibration theory to study a mass-spring system of three degrees. Using Newton's first law analyzing the force of the object, drawn the simulation diagram from the control perspective. Reflecting all changes of the independent variables and their relationships. And revealing the characteristics of the system. We also analyzed the system can not only be controlled but also can be observed, understanding the inherent nature of the system further. About the dynamic characteristics of the system, we use the main formation method to calculate the natural frequency, the main formation and displacement response of the system^[1].

Abstract: The Haokou power station is located in the south of Wu Long in chongqing, which is a medium-sized hydropower project given priority to electricity. The Dam located in south bank of Wujiang river downstream of Furong river has the catchment area of 7400 km², total capacity of 94.12 million m³, installed capacity of 125 MW power . After the excavation of the main building, trailing edge to form 30 m high rock slope is tangential. Slope rock mass is given priority to with weakly weathered shale, mudstone, shallow accumulation horizon, thickness is about 0.5 m to 6.0 m. In analysis of slope stability, the FLAC 3d and the strength subtraction method was used. Considering of gravity, the shore web of pressure, water pressure and reinforcement bolt load combination, the stress response, displacement response, plastic zone as well as the safety factor of slope was analyzed. The calculation results show that the slope is stable.

Abstract: Pressure of the liquid is used as power source of hydraulic vibration exciter. Rotary directional control valve is the realization of oiling-way veversing components . The piston is reciprocated under the influence of the change of the hydraulic. The reciprocating movement of the piston is a result of fluid pressure.Working area of the piston multiplied by the pressure of the liquid is equal to the thrust of the piston.Displacement response of the vibration exciter can be simplified to the second-order vibration systems.Elastic beam is used as limit components of piston of vibration exciter,the piston vibration waveform is a sine wave .The volume of elastic beam is smaller than the volume of fluid elastic element . The hydraulic circuit is a dual pump fuel supply circuits.Pumps are used to supply rotary valve and hydraulic cylinder .Dual pumps fuel supply system is conducive to control fluid pressure and flow of the rotary valve and vibration piston.

Abstract: According to the structure of a solenoid actuator, transient field mathematic model of two-dimension is established. Based on model, relationship between transient current of the coil and the motion of the armature is analyzed. Compared to experimental results, simulated results are proved, which are able to provide theory basis for displacement detection of electromagnet valve and fault diagnosis of valve and system by inner parameters of solenoid actuator. The results show that the rising current characteristic has the change process of increase-decrease-increase, and separating motion time of the solenoid actuator could be estimated to be 20 ms (18 v). The solenoid actuator is pulled back approximately in 8 ms under the action of the spring.

Abstract: In order to get the displacement response curve of the Gantry Crane Girder under three stage of lifting process, the vibration differential equation and displacement response expression were deduced, combining with the actual case, the displacement response expression and displacement response curve were deduced in the load duration time 0.8 s and 0.2 s. The results show that: the lifting process is an important factor affecting the structural vibration; Displacement peak and load duration time are inversely proportional; Increase the load duration time can reduce the vibration of the structure.

Abstract: Sensorineural hearing loss is caused by the damage of hair cells in the inner ear, the transmission of acoustical signal is disrupted without hair cells. In order to solve the problems exist in electrical cochlea,the idea of develop bionic microphone is proposed using the special property of piezoelectric material. Primary design of the size of bionic microphone is given with the reference of advanced manufacturing methods. According to the scope of human hearing threshold, Acoustical-structural coupling property of the bionic microphone is researched when the microphone is immersed in lymph. And the results shows that the displacement is going up at first and then down with the increasing of the frequency within 1000Hz, the displacement is 0.28mm when the frequency is 500Hz,and goes down to 0.205mm when frequency is 1000Hz. When frequency is varied from 1000Hz to 10000Hz, the displacement is changing apparently. The displacement has been changed from 0.208mm when the frequency is 1000Hz to 2.6um when the frequency is 10000Hz. Frequency selectivity is not clearly presented from the point of the location of maximum displacement,and this phenomenon may caused by the fasten mode of designed microphone and high Young modulus of silicon.

Abstract: In order to get the displacement response curve of the Portal Crane under four phase of unloading process, the vibration system was built, the vibration differential equation and displacement response expression were deduced, combining with the actual case, the displacement response expression and displacement response curve were deduced in the open grab time 1.5 s and 4 s. The results show that: the unloading process is an important factor affecting the structural vibration; Displacement peak and open grab time are inversely proportional; Increase the open grab time can reduce the vibration of the structure.

Abstract: The safety response of joint rock underground tunnels is one of the many problems that draw the attention of geology specialists and scholars. Adopting two dimensional discrete element method, a numerical model of joint rock underground cavern is established to study its stability. The buried depth and the lateral pressure coefficient are considered respectively. The result shows: when the lateral pressure coefficient is identical, the depth is bigger the displacement is more bigger, and the displacement is strong influenced by the buried depth when the lateral pressure coefficient is big; In the same depth the tunnel is buried, the tunnel rocks displacement is slightly influenced by the lateral pressure coefficient when it is small, but the influence is seriously as the lateral pressure coefficient is big. The simulation in the context can be used to provide guide for joint rock tunnel excavation and supporting.

Abstract: This paper presents a method for analytical prediction of displacement response and the results from virtual vibrating tests of a washing machine cabinet model. The cabinet was modelled with finite element method in ANSYS software. The input excitation used during the test was from the records obtained from the virtual prototype of a front-loading washing machine during the spin-dry cycle. The simulation results indicated good agreement with the mechanical performance of the actual test system, which could afford better support for designers to explore the robustness of the cabinet.

Abstract: We report numerical simulations of the interactions between sea ice and the off-sea bridge pier by using the explicit dynamic analysis software ANSYS/LS-DYNA. The simulated propagation of cracks in ice, ice force, and bridge pier displacement response are consistent with both theoretical and field experimental results. We find that the displacement response is not sensitive to the variations of the ice velocity, while the ice force is approximately inverse linear proportional to the ice velocity.