scholarly journals Dynamic Characteristics Analysis of the Six-Axis Force/Torque Sensor

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Liyue Fu ◽  
Aiguo Song
Keyword(s):  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Dynamic Models ◽  
Dynamic Range ◽  
Model Identification ◽  
Step Response ◽  
Fe Model ◽  
De Algorithm ◽  
Characteristics Analysis ◽  
Experimental Values

In this study, dynamic characteristics of a robot six-axis wrist force/torque (F/T) sensor with crossbeam elastomer are analyzed by two methods of model identification, a method for simultaneous identification of order and parameters of the model (SIM) and a method based on the differential evolution (DE) algorithm. Firstly, by establishing the simplified mechanical model and finite element (FE) model, respectively, natural frequency of the six-axis wrist F/T sensor is calculated. Secondly, dynamic calibration experiment is conducted. Lastly, two dynamic models of the sensor are identified by SIM and DE methods and the dynamic characteristics of the sensor, such as natural frequency and working band, are further analyzed. Comparing experimental values with the theoretical values, the results show that this sensor has a wide dynamic range with the first natural frequency at more than 1600 Hz, working bands (±5%) are more than 400 Hz, and the step response oscillation is intense. This study can provide a reference for the application of the six-axis F/T sensor in the field of dynamic measurement.

Dynamic Characteristics Analysis and Optimization Design of Spindle Box with FEA

2012 ◽  
Vol 490-495 ◽  
pp. 2273-2277 ◽  
Author(s):  
Xiao Peng Li ◽  
Wei Wang ◽  
Mi Que Zhao ◽  
Xiao Chen Meng
Keyword(s):  
Finite Element ◽  
Shape Optimization ◽  
Objective Function ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Optimization Design ◽  
Static And Dynamic Characteristics ◽  
Maximum Deformation ◽  
Characteristics Analysis ◽  
Dynamic Characteristics Analysis

The simplified finite element modal was established with ANSYS aiming to study the spindle box. The changing regularity of the first 6-order natural frequency of spindle box was studied after the static and modal analysis. Shape optimization design was carried out by taking the maximum deformation of the direction of X，Y，Z as the objective function. The results show that the structure of spindle box after optimization can effectively reduce the maximum deformations of the direction of X，Y，Z，and has better static and dynamic characteristics.

Dynamic Characteristics Analysis of a Combined Gantry Milling Machine

2011 ◽  
Vol 105-107 ◽  
pp. 553-560
Author(s):  
Duan Wei Shi ◽  
Can Pei Liu ◽  
Zhi Yuan Wang ◽  
Yan Zhang ◽  
Xiao Qing Sun
Keyword(s):  
Harmonic Analysis ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Dynamic Stiffness ◽  
Joint Stiffness ◽  
Ball Screw ◽  
Fe Model ◽  
Milling Machine ◽  
Feed System ◽  
Characteristics Analysis

The FE model of a combined gantry milling machine was constructed. The joint stiffness of bolt fastening, ball screw, and roller guideway were calculated. The static analysis, modal analysis and harmonic analysis of the whole machine were carried out. The results indicated that the static stiffness and minimum dynamic stiffness of the spindle could satisfy the accuracy requirements of milling, but the stiffness of the X-axis feed system was comparatively low, while the stiffness of the rest and the cross-beam could be relatively abundant. The result of “considering joint stiffness” modal analysis was more accurate than “unconsidering joint stiffness”, especially the 5th-order natural frequency had a difference of up to 52.2%. The harmonic analysis result showed that the response amplitude of the spindle center was comparatively large in three directions when the 1st-order and the 17th-order natural frequency were working, so the frequencies should be avoided while working.

Stress and Dynamic Characteristics Analysis of Multilayer Composite Flywheel

2013 ◽  
Vol 655-657 ◽  
pp. 185-189
Author(s):  
Guang Xi Li ◽  
Fan Xin Kong ◽  
Lin He ◽  
Li Yang
Keyword(s):  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Element Model ◽  
Calculation Model ◽  
Multilayer Composite ◽  
Composite Flywheel ◽  
Characteristics Analysis ◽  
Rotor Structure ◽  
Symmetric Theory ◽  
Dynamic Characteristics Analysis

Stress and dynamic characteristics analysis of Multilayer composite flywheel to study its natural frequency, stress and displacement distribution was investigated in this paper. Combined with the rotor structure characteristics, a calculation model was established on the basis of anisotropy symmetric theory. The analytic formulas with flywheel rotor at working speed were obtained. Established the finite element model of the rotor. The radial , hoop stress, radial displacement and dynamic characteristics at a random point were analyzed completely．The results indicate that the safety factor and the natural frequency meet the design requirements.

Finite Element Modal Analysis of the Cable-Stayed Bridge

2013 ◽  
Vol 438-439 ◽  
pp. 883-885
Author(s):  
Ji Lin Wu ◽  
Chun Cao Song
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Natural Vibration ◽  
Vibration Mode ◽  
Beam Elements ◽  
Cable Stayed Bridge ◽  
Characteristics Analysis ◽  
Natural Vibration Mode ◽  
Dynamic Characteristics Analysis

In the process of modeling, ignoring the displacement of the pier directly replaced with fixed constraint, beam elements were adopted to simulate girder and pylon, and link elements were adopted to simulate the cable. The first ten order natural vibration mode and natural frequency were obtained, and the dynamic characteristics analysis of a single pylon cable-stayed bridge was discussed, which can provide certain reference and guidance for solving the problem of the cable-stayed bridge design.

Dynamic Characteristics Analysis for the Bed of CNC Machine Tool

2010 ◽  
Vol 37-38 ◽  
pp. 370-373
Author(s):  
S.R. Zhang ◽  
X.G. Li ◽  
L.F. Yang ◽  
B. Yu
Keyword(s):  
Machine Tool ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Pulse Excitation ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Main Mode ◽  
Characteristics Analysis ◽  
Dynamic Characteristics Analysis ◽  
Made In

The experimentation modal analysis is made in the bed of the CNC machine tool with the hammering method of the pulse excitation. Then the dynamic characteristics of this bed are studied and the natural frequency of the bed in the specified frequency band. It supplies a clear reference for the structured optimum design of the bed through the analysis of the main mode on every rank.

Investigation of Strength and Dynamic Characteristics for the Rolling Mill

2013 ◽  
Vol 706-708 ◽  
pp. 1405-1408
Author(s):  
Xi Ping Guo ◽  
Shuang Zhou
Keyword(s):  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Rolling Mill ◽  
Maximum Stress ◽  
Weak Link ◽  
Deformation Analysis ◽  
Vibration Model ◽  
Strength And Stiffness ◽  
Stress And Deformation ◽  
Diagram Analysis

Stress and deformation analysis of 950 mill housing was done by means of ANSYS to calculate the maximum stress and deformation. Strength and stiffness of the mill roll were checked to meet requirements. Carries on the modal analysis to the rolling-mill housing, obtains its first 10 steps the natural frequency and the mode of vibration, through the vibration model diagram analysis frame of the weak link,and it is significant for similar mill housing designs.

Dynamic Characteristics Analysis of Cable-Rib Tension Deployable Antenna

2016 ◽  
Author(s):  
Liu Ruiwei ◽  
Hongwei Guo ◽  
Zhang Qinghua ◽  
Rongqiang Liu ◽  
Tang Dewei
Keyword(s):  
Dynamic Characteristics ◽  
Structural Parameters ◽  
Element Model ◽  
Structure Design ◽  
Antenna Structure ◽  
Characteristics Analysis ◽  
New Type ◽  
Dynamic Characteristics Analysis ◽  
The Finite Element Model ◽  
Weight Dynamic

Balancing stiffness and weight is of substantial importance for antenna structure design. Conventional fold-rib antennas need sufficient weight to meet stiffness requirements. To address this issue, this paper proposes a new type of cable-rib tension deployable antenna that consists of six radial rib deployment mechanisms, numerous tensioned cables, and a mesh reflective surface. The primary innovation of this study is the application of numerous tensioned cables instead of metal materials to enhance the stiffness of the entire antenna while ensuring relatively less weight. Dynamic characteristics were analyzed to optimize the weight and stiffness of the antenna with the finite element model by subspace method. The first six orders of natural frequencies and corresponding vibration modes of the antenna structure are obtained. In addition, the effects of structural parameters on natural frequency are studied, and a method to improve the rigidity of the deployable antenna structure is proposed.

Study of Temperature Effect on Servovalve-Controlled Fuel Metering Unit

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Bin Wang ◽  
Haocen Zhao ◽  
Ling Yu ◽  
Zhifeng Ye
Keyword(s):  
Steady State ◽  
Temperature Variation ◽  
Dynamic Characteristics ◽  
Numerical Study ◽  
Step Response ◽  
Fuel Temperature ◽  
Wide Range ◽  
Fuel Rate ◽  
Testing Condition ◽  
The Given

It is usual that fuel system of an aero-engine operates within a wide range of temperatures. As a result, this can have effect on both the characteristics and precision of fuel metering unit (FMU), even on the performance and safety of the whole engine. This paper provides theoretical analysis of the effect that fluctuation of fuel temperature has on the controllability of FMU and clarifies the drawbacks of the pure mathematical models considering fuel temperature variation for FMU. Taking the electrohydraulic servovalve-controlled FMU as the numerical study, simulation in AMESim is carried out by thermal hydraulic model under the temperatures ranged from −10 to 60 °C to confirm the effectiveness and precision of the model on the basis of steady-state and dynamic characteristics of FMU. Meanwhile, the FMU testing workbench with temperature adjustment device employing the fuel cooler and heater is established to conduct an experiment of the fuel temperature characteristics. Results show that the experiment matches well with the simulation with a relative error no more than 5% and that 0–50 °C fuel temperature variation produces up to 5.2% decrease in fuel rate. In addition, step response increases with the fuel temperature. Fuel temperature has no virtual impact on the steady-state and dynamic characteristics of FMU under the testing condition in this paper, implying that FMU can operate normally in the given temperature range.

Investigation of Sensitivity Effect Based on Mass and Stiffness Modification in Automobile Crankshaft

2015 ◽  
Vol 752-753 ◽  
pp. 839-844
Author(s):  
R.M.S. Zetty ◽  
B.A. Aminudin ◽  
L.M. Aung ◽  
M.K. Khalid ◽  
H.M.Y. Norfazrina ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Differential Analysis ◽  
Partial Differential ◽  
Mechanical Parts ◽  
Stiffness Reduction ◽  
Experiment And Simulation ◽  
Good Agreement

A modeling through sensitivity analysis is one of the promising methods to investigate the dynamic characteristics of complex mechanical parts. This study aimed to investigate the effect of sensitivity based on mass and stiffness modification in automobile crankshaft as a function of natural frequency. Verification for the crankshaft model that is used in the experiment and simulation was done and both results showed good agreement and small errors percentage. The modification was also done by reducing the different percentage of crankshaft’s mass and stiffness. Partial differential analysis was used in the sensitivity analysis in order to figure out the natural frequency after every set of modification. According to the results, we also found that there were changes of sensitivity value by changes in mass value but the stiffness value remains unchanged. However, there is no significant effect of stiffness reduction on vibration was found in this research.

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