Contact Force/Torque Prediction and Analysis Model for Large Length-diameter Ratio Peg-in-hole Assembly

2018 ◽  
Author(s):  
Yuchen Wang ◽  
Peng Wang ◽  
Changchun Liu ◽  
Gaoming Hao ◽  
Zhao Xiong ◽  
...  
Keyword(s):  
Contact Force ◽  
Diameter Ratio ◽  
Analysis Model ◽  
Large Length

scholarly journals Optimization and Tuning of Passive Tuned Mass Damper Embedded in Milling Tool for Chatter Mitigation

2020 ◽  
Vol 5 (1) ◽  
pp. 2
Author(s):  
Wenshuo Ma ◽  
Jingjun Yu ◽  
Yiqing Yang ◽  
Yunfei Wang
Keyword(s):  
Tuned Mass Damper ◽  
Structural Features ◽  
Milling Process ◽  
Diameter Ratio ◽  
Depth Of Cut ◽  
Receptance Coupling ◽  
Milling Tool ◽  
Mass Damper ◽  
Large Length ◽  
Deep Depth

Milling tools with a large length–diameter ratio are widely applied in machining structural features with deep depth. However, their high dynamic flexibility gives rise to chatter vibrations, which results in poor surface finish, reduced productivity, and even tool damage. With a passive tuned mass damper (TMD) embedded inside the arbor, a large length–diameter ratio milling tool with chatter-resistance ability was developed. By modeling the milling tool as a continuous beam, the tool-tip frequency response function (FRF) of the milling tool with TMD was derived using receptance coupling substructure analysis (RCSA), and the gyroscopic effect of the rotating tool was incorporated. The TMD parameters were optimized numerically with the consideration of mounting position based on the maximum cutting stability criterion, followed by the simulation of the effectiveness of the optimized and detuned TMD. With the tool-tip FRF obtained, the chatter stability of the milling process was predicted. Tap tests showed that the TMD was able to increase the minimum real part of the FRF by 79.3%. The stability lobe diagram (SLD) was predicted, and the minimum critical depth of cut in milling operations was enhanced from 0.10 to 0.46 mm.

Design of a turning cutting tool with large length–diameter ratio based on three-element type vibration absorber

2020 ◽  
Vol 234 (6-7) ◽  
pp. 1032-1043
Author(s):  
Yiqing Yang ◽  
Haoyang Gao ◽  
Wenshuo Ma ◽  
Qiang Liu
Keyword(s):  
Frequency Response ◽  
Cutting Tool ◽  
Vibration Suppression ◽  
Diameter Ratio ◽  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Target Mode ◽  
Large Length ◽  
Element Type ◽  
Structural Parts

The vibration absorber has been effective in vibration control. From the demand of manufacturing structural parts with a deep hole, the design of a turning cutting tool with large length–diameter ratio is presented. An analytical approach of acquiring frequency response of primary structure equipped with typical single-degree-of-freedom vibration absorbers is formulated, and background modes are incorporated with the purpose of achieving an accurate tuning of vibration absorber. Specifically, the three-element type is investigated as the damping element of the vibration absorber embedded in the cutting tool contributes to the stiffness, although it demonstrates medium performance of vibration suppression according to non-dimensional analysis. The experimentally tuned frequency response function of the turning cutting tool with three-element vibration absorber achieves 87.1% reduction on the amplitude of the target mode. Finally, several configurations of internal turning operations are carried out to validate the design of the vibration absorber.

Fabrication and properties of MnZn ferrite with large length-diameter ratio

2020 ◽  
Vol 554 (1) ◽  
pp. 204-211
Author(s):  
Zhongxia Duan ◽  
Haozhang Chen ◽  
Xiyue Tao ◽  
Hongxing Mi ◽  
Shuxun Lou ◽  
...  
Keyword(s):  
Diameter Ratio ◽  
Mnzn Ferrite ◽  
Large Length

scholarly journals The safety analysis of transportation vehicles carrying prefabricated units under the action of gusts

2019 ◽  
Vol 259 ◽  
pp. 03001
Author(s):  
Gang Yao ◽  
Mingpu Wang ◽  
Yang Yang
Keyword(s):  
Contact Force ◽  
Synthesis Method ◽  
Safety Analysis ◽  
Wind Load ◽  
The Body ◽  
Windward Side ◽  
Superposition Method ◽  
Analysis Model ◽  
Lateral Deviation ◽  
Road Surfaces

The prefabricated-unit industry has developed rapidly and the safety of vehicles carrying prefabricated units has received extensive attention. In order to evaluate the safety of vehicles carrying prefabricated units under the action of gusts, the roughness of road surfaces was simulated by the sinusoid superposition method. Furthermore, the wind load was simulated by the harmonic synthesis method. The analysis model of the 13-DOF vehicle was established, and the wind-vehicle-road system was formed. In addition, the safety of the vehicles carrying prefabricated units under gusts was analyzed. It is demonstrated that when a vehicle encounters a sudden gust during driving, lateral deviation of the body will occur. The contact force on the windward side wheel will drop sharply and the wheel is easy to get off the ground, which decides whether a rollover accident happens or not. It sheds light on the safety analysis for ultra-wide and overweight vehicles under gust action.

scholarly journals Most recent developments in electrospun magnetic nanofibers: A review

2020 ◽  
Vol 15 ◽  
pp. 155892501990084 ◽  
Author(s):  
Tomasz Blachowicz ◽  
Andrea Ehrmann
Keyword(s):  
Material Properties ◽  
Bulk Material ◽  
Basic Research ◽  
Diameter Ratio ◽  
Cell Manipulation ◽  
One Dimensional ◽  
Magnetic Structures ◽  
Recent Developments ◽  
Large Length ◽  
Magnetic Nanofibers

One-dimensional materials, such as nanowires, nanotubes, or nanofibers, have attracted more and more attention recently due to their unique physical properties. Their large length-to-diameter ratio creates anisotropic material properties which could not be reached in bulk material. Especially one-dimensional magnetic structures are of high interest since the strong shape anisotropy reveals new magnetization reversal modes and possible applications. One possibility to create magnetic nanofibers in a relatively simple way is offered by electrospinning them from polymer solutions or melts with incorporated magnetic nanoparticles. This review gives an overview of most recent methods of electrospinning magnetic nanofibers, measuring their properties as well as possible applications from basic research to single-cell manipulation to microwave absorption.

scholarly journals Halloysite nanotubes in polymer science: purification, characterization, modification and applications

2020 ◽  
Vol 9 (1) ◽  
pp. 323-344 ◽  
Author(s):  
Cong Cheng ◽  
Weihua Song ◽  
Qiang Zhao ◽  
Hailei Zhang
Keyword(s):  
Spatial Structure ◽  
Environmental Protection ◽  
Polymer Composites ◽  
Halloysite Nanotubes ◽  
Diameter Ratio ◽  
Polymer Science ◽  
Lumen Volume ◽  
Large Length

AbstractHalloysite nanotubes (HNTs) are natural tubular materials, which show a number of attractive advantages such as the unique micro-spatial structure, large length-diameter ratio, high lumen volume, nontoxicity and widespread. The development of HNTs-based polymer composites expanded their applications in the fields of energy, catalysis, biomedicine, environmental protection and many others. This review will briefly summarize the purification, characterization and modification methods upon HNTs, in which the preparation and application of the HNTs-based polymer composites are emphasized. This paper may be beneficial for the development of novel strategies for the preparation of new libraries of HNTs-based polymer composites and the exploration of their applications.

Optimal Parameters Analysis of Dynamical Vibration Absorption Lathe Tool with Large Length to Diameter Ratio

2011 ◽  
Vol 121-126 ◽  
pp. 2146-2150
Author(s):  
Bai Qin ◽  
Bo Zhang ◽  
Xiao Dong Yu ◽  
Yan Qin Zhang ◽  
Gui Hua Han ◽  
...  
Keyword(s):  
Frequency Response ◽  
Diameter Ratio ◽  
Flexible Body ◽  
Equivalent Viscous Damping ◽  
Vibration Absorption ◽  
Large Length ◽  
Relationship Of ◽  
System Frequency ◽  
Lathe Tool ◽  
Length To Diameter Ratio

The multi flexible body dynamical simulation model of dynamical vibration absorption lathe tool with large length to diameter ratio is built up according to the actual experiment lathe tool by using the software ADAMS and ANSYS. The experiment data which are consistent with the simulation result verify the correctness of the multi flexible body dynamical model. Aiming at reducing the peak value of system frequency response, the dynamical vibration absorption system is optimized. The optimized frequency curve shows that the system frequency response is improved obviously. On this basis the influence of the mass of heavy turning body on the vibration system is discussed. Also, the relationship of the mass of heavy turning body and the optimal system parameters including equivalent stiffness coefficient and equivalent viscous damping coefficient is studied. This offers the design considerations about the structure of the dynamical vibration absorption lathe tool with large length to diameter ratio.

An Examination of the Repeatability of Combustion Processes in a Homogeneous Stream of a Gaseous Fuel and Air

1976 ◽  
Author(s):  
G. A. Karim ◽  
G. S. Sarpal
Keyword(s):  
Combustion Process ◽  
Tubular Reactor ◽  
Flow Characteristics ◽  
Diameter Ratio ◽  
Controlled Environment ◽  
Flow Conditions ◽  
Factors Influencing ◽  
Large Length ◽  
Combustion Processes

The present paper reviews some of the findings of an experimental investigation of flame initiation and spread characteristics in the controlled environment of a flowing homogeneous stream of fuel and air within a smooth cylindrical tubular reactor with a large length-to-diameter ratio; both steady and controlled pulsating flow conditions were considered with methane as a fuel. The role of some of the important factors influencing the combustion process, such as the flow characteristics and the imposition of pulsation of known frequency and amplitude, could be established. Particular attention was given to the extent of variations observed in these processes when tests were repeated under otherwise identical conditions.

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