scholarly journals Analysis model of restoring force of a rubber air spring

2021 ◽  
Author(s):  
T. D. Le ◽  
N. Y. P. Vo
Keyword(s):  
Analysis Model ◽  
Air Spring ◽  
Restoring Force

A STUDY ON THE EARTHQUAKE RESPONSE CHARACTERISTIC OF HYSTERESIS DAMPER USING SLY120 AND SS400

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2809-2814
Author(s):  
JAE HYOUK CHOI ◽  
RYOUICHI TAKISHITA
Keyword(s):  
Numerical Analysis ◽  
Vibration Suppression ◽  
Response Characteristic ◽  
Test System ◽  
Earthquake Response ◽  
Force Characteristic ◽  
Analysis Model ◽  
Loading Test ◽  
Restoring Force ◽  
Response Test

To examine earthquake response characteristics of hysteresis damper using SLY120 and SS400 steel panel damper, earthquake response test were performed. In this paper, restoring force characteristic of hysteresis damper which is obtained by loading test are assessed using numerical analysis model. A skeleton shift model, which has been used frequently in conventional analysis, is applied. Using a hybrid earthquake response test system, various characteristics of structural components that are difficult to model and to express mathematically are detected by test and incorporated into the computer system to promote numerical analysis of the whole system. In this research, hybrid earthquake response simulation of the linked vibration suppression structure is carried out, whereas hysteresis damper at the linked vibration control structure are selected as the actual loading test part and the peripheral frame is considered to be the virtual structure part.

Investigation of the restoring force model of through-tenon and half-tenon of timber with a certain level of universality

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 5313-5328
Author(s):  
Zhongwei Gao ◽  
Donghui Ma ◽  
Ziyi Wang ◽  
Xiaodong Guo ◽  
Shidong Fang ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Seismic Performance ◽  
Stiffness Degradation ◽  
Coefficient Of Determination ◽  
Percentage Error ◽  
Force Model ◽  
Analysis Model ◽  
Restoring Force ◽  
Element Analysis ◽  
Restoring Force Model

A restoring force model of through-tenon and half-tenon joints was studied with a certain level of universality. To address the differences among data collected under different test conditions, test data collected via through-tenon and half-tenon joints were counted and fitted, and their similarities were then generalized. To better simulate the gap and stiffness degradation between the through-tenon and half-tenon joints, the skeleton curves frameworks were simplified into four phases, namely sliding, elastic, yielding, and failure. The normalized control parameters collected through the characteristics of the framework of through-tenon and half-tenon joints, as well as the different coefficients of strength degradation and stiffness degradation were calculated. The hysteretic rules of the restoring force model of through-tenon and half-tenon joints were developed. Through case study, the results show that the MAPE (mean absolute percentage error) and R2 (coefficient of determination) of experimental data in the references and simulated data of through-tenon are respectively 12.570% and 0.735, while those of half-tenon are respectively 11.763% and 0.772; and the restoring force model of through-tenon and half-tenon joints being constructed had a certain level of universality. The results demonstrated that the construction of refined finite element analysis model of Chinese ancient timber architectures can be simplified to a certain extent to meet the pressing time for seismic performance analysis of many ancient timber architectures. It provides researchers with an innovative pathway to enhance the efficiency of seismic performance analysis of ancient timber architectures.

Study on Analytical Model of Nonlinear Vibration for Elastic Plates With Gaps Under Random Waves

2004 ◽  
Vol 126 (4) ◽  
pp. 504-509 ◽  
Author(s):  
Masanori Shintani ◽  
Manabu Hamai
Keyword(s):  
Nonlinear Vibration ◽  
Analytical Model ◽  
Force Characteristic ◽  
Solid Model ◽  
Random Waves ◽  
Elastic Plates ◽  
Analysis Model ◽  
Restoring Force ◽  
Elasto Plasticity ◽  
Force Characteristics

In this paper, an analytical model for the nonlinear elastic-plastic vibration for long plates with gaps subjected to random vibrations is considered. The nonlinear vibration is caused by the collision phenomena between a mass through a gap and plates with thickness of 0.5, 0.6, and 0.8 mm. An elastic perfectly plastic solid material is assumed in some cases, which adds another aspect to the nonlinear behavior of the system. The material characteristic of the steel is assumed to be an elasto-plasticity solid model. A restoring force characteristic is obtained as the nonlinear vibration of a cubic equation for 0.5, 0.6, and 0.8 mm, the thickness of the plates by experiments. Now the analytical model is proposed by the elasto-plasticity solid model. The relation between the displacement and the force is described by a complicated equation. The curve from the analytical model is called a deflection curve. The results by the analytical model are compared with the results by the experimental model. The restoring force characteristics by the analysis agree with those of the experiment. The restoring force characteristics of the analysis are described using cubic equations. The simple analysis model for evaluation of the vibration characteristic of the nonlinear vibration system, which performs collision vibration with gaps, is proposed by elasto-plasticity solid model in this paper. The results of this proposed analytical model agree with the experimental results better than the results of the minimum of error of square.

Disturbance Suppression in Attitude Control of Raft System Using Air Spring

2012 ◽  
Vol 184-185 ◽  
pp. 155-160
Author(s):  
Zhi Qiang Lv ◽  
Liang Shi ◽  
Ying Long Zhao
Keyword(s):  
Attitude Control ◽  
Technological Problem ◽  
Analysis Model ◽  
Air Spring ◽  
Isolation System ◽  
Load Variation ◽  
Disturbance Suppression ◽  
Set Up

Though air spring greatly improves the isolation efficiency of raft isolation system, the technological problem occurs as how to maintain raft attitude balance. This paper set up an analysis model of raft attitude disturbance, and analyzed the influence of various disturbance sources on raft attitude, including hull rolling, systematic load variation, and air spring leakage. It proposed to control raft attitude through adjusting the pressure of air spring isolator, and then studied the feasibility of this method. The results show that the influence of various disturbance sources could be canceled effectively by adjusting the pressure of air spring isolator, thus maintaining attitude balance.

Study on Isolation Device for Decrease of Displacement by Using Control of Friction

2007 ◽  
Author(s):  
Masanori Shintani ◽  
Naoya Taguchi
Keyword(s):  
Coefficient Of Friction ◽  
Frictional Force ◽  
Seismic Waves ◽  
Simulation Analysis ◽  
Relative Displacement ◽  
Analysis Model ◽  
Restoring Force ◽  
Seismic Isolator ◽  
Compression Spring ◽  
The Coefficient Of Friction

This paper deals with reduction of horizontal relative displacement by using a frictional force for a seismic isolator. First, a compression spring is attached to the base. Next, a slope plate is superimposed on it. The frictional force acts on the slope plate. The restoring-force is given to the seismic isolator by the compression spring attached to the base. In the equation of motion of the analytical model, the frictional force changes in proportion to the displacement. The restoring-force is also proportional to the displacement. The restoring-force always works in the direction of the center. Therefore, the frictional force and the restoring-force are both proportional to the displacement. Simulation analysis was performed under various conditions using this analysis model. As a result of conducting the analysis and an experiment with this model, it was shown that response acceleration and relative displacement can be reduced successfully. In order to reduce response acceleration and relative displacement more, analysis was carried out with the actual earthquake waves under the conditions to change the coefficient of friction by relative displacement. As a result, the coefficient of friction that reduces relative displacement most effectively without impairing the performance of the seismic isolator was established. However, the coefficient of friction that reduces the response acceleration and relative displacement effectively depends on by seismic waves. Therefore, in this report, the coefficient of friction that reduces response acceleration and relative displacement most effectively is determined by using white noise. It is analyzed with actual seismic waves by using the decided parameters. The performance of the seismic isolator is examined.

Study on Two-Dimensions Base-Isolating Device for Reduction of Displacement by Using Friction Force

2009 ◽  
Author(s):  
Tomoyuki Makino ◽  
Masanori Shintani
Keyword(s):  
Friction Force ◽  
Friction Surface ◽  
Seismic Waves ◽  
Simulation Analysis ◽  
Vertical Direction ◽  
Relative Displacement ◽  
Two Dimensions ◽  
Analysis Model ◽  
Restoring Force ◽  
Isolation Device

This paper deals with research of new isolation device with reduction of horizontal relative displacement by using friction force and reduction of vertical response acceleration and relative displacement by using spring and friction force. The isolation device is using a friction surface. The friction surface is subjected to acts on the slope plate. The restoring-force of horizontal direction is given to the isolation device from elastic force of a compression spring attached to the base. The restoring-force always works in the direction of the center. Therefore, the frictional force and the restoring-force are both proportional to the displacement. The restoring-force of the vertical direction is given to the isolation device from compression springs and draft springs. Simulation analysis was performed under various conditions using this analysis model. Condition reducing both response acceleration and displacement effectively is calculated on various conditions using the analysis model. Furthermore, an experiment is conducted using the experimental device. The experiment is conducted by an imagination wave. Analysis is also conducted on the same conditions. The results of the experiment are compared with the results of the analysis. The performance of the isolation device is examined. The validity of an analysis model is examined. As a result of conducting the analysis and an experiment with this model, it was shown that response acceleration and relative displacement can be reduced successfully. The validity of an analysis model is shown. Next, it analyzes by actual seismic waves. The performance of isolation equipment in actual seismic waves is examined and shown.

scholarly journals Research on nonlinear model and fuzzy fractional order PIλDμ control of air suspension system

2021 ◽  
pp. 146134842110518
Author(s):  
Jingyue Wang ◽  
Kun Lv ◽  
Haotian Wang ◽  
Sheng Guo ◽  
Junnian wang
Keyword(s):  
Fractional Order ◽  
Control Strategy ◽  
Pid Control ◽  
Ride Comfort ◽  
Suspension System ◽  
Fuzzy Pid Control ◽  
Air Spring ◽  
Restoring Force ◽  
Air Suspension ◽  
Simulation Results

To improve the ride comfort of wheeled armored vehicles, air springs are used. To describe the vehicle motion more accurately, a nine-degree-of-freedom air suspension system for the whole vehicle was established, and its equations of motion were derived. Through theoretical analysis of the stiffness characteristics and forces on the air springs, the nonlinear restoring force was obtained as a cubic polynomial of the air spring displacement. The simulation results obtained by fitting the polynomial and radial basis function curves with MATLAB/Simulink software are consistent with the actual test results, thus verifying the correctness of the nonlinear air spring polynomial model. Finally, a fuzzy fractional order PIλDμ controller is designed and simulated for the vehicle-seat-body model in terms of wheel dynamic load, suspension dynamic deflection, body acceleration, and other indicators. The simulation results show that the fuzzy fractional order PIλDμ Proportion Integral Differential (PID) control strategy has better overall performance than the PID control strategy, fuzzy control strategy, and fuzzy PID control strategy.

scholarly journals Experimental Verification of Analysis Model of Seismic Isolation With High-Static-Low-Dynamic Stiffness

2021 ◽  
Author(s):  
Kou Miyamoto ◽  
Jun Iba ◽  
Koichi Watanabe ◽  
Ken Ishii ◽  
Masaru Kikuchi
Keyword(s):  
Seismic Isolation ◽  
Dynamic Stiffness ◽  
Time History ◽  
Analysis Model ◽  
Restoring Force ◽  
Maximum Displacement ◽  
Natural Period ◽  
Absolute Acceleration ◽  
Seismic Force ◽  
Allowable Range

Abstract This paper verifies the model of high-static-low-dynamic stiffness (HSLDS) for seismic isolation based on an experiment. Seismic isolation is widely used in several countries. Moreover, the number of seismically isolated buildings has rapidly increased in these few decades. Seismic isolation extends a natural period of a building and decreases the absolute acceleration to re-duce a seismic force. However, as there is a trade-off between displacement and absolute acceleration, it might result in the maximum displacement be-yond an allowable range. HSLDS is nonlinear, and its restoring force can be approximated cube of a displacement. Thus, HSLDS applies a large restoring force for significant displacement, and the force is small for small perturbation around an equilibrium position. To improve the control performance of seismic isolation for displacement, we apply HSLDS for seismic isolation. This paper conducts an experiment and compares the results with a time-history analysis to verify a numerical model of HSLDS

NONLINEAR ANALYSIS OF JAPANESE TRADITIONAL WOODEN FRAMES WITH FITTING-TYPE JOINT

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Naoto Idate ◽  
Yukimasa Yamada ◽  
Noriko Takiyama
Keyword(s):  
Sensitivity Analysis ◽  
Analysis Model ◽  
Restoring Force ◽  
Beam Elements ◽  
Four Frames ◽  
Test Pieces ◽  
Restoring Forces ◽  
Loading Tests ◽  
Cyclic Loading Tests ◽  
Analysis Models

This paper reports our research project on the seismic performance of traditional wooden frames with large-section beams. First, based on past cyclic loading tests on four frames, a simple analysis model of a fitting-type joint was constructed using beam elements. Next, past experimental results were simulated by the model. Finally, a sensitivity analysis was performed to study about the effect of height arrangement of beams on the performance of the whole frame. The major findings of this study are as follows: (a) Some material tests are conducted for wooden test pieces cut down from all column of specimens. The compressive spring properties are decided. (b) Analysis models are constructed, and the restoring forces of frame specimens are simulated precisely. (c) The relation between height arranging beams and the change in restoring force is considered by sensitivity analysis.

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