Evaluation on 3D micro-ground profile accuracy of micro-pyramid-structured Si surface using an adaptive-orientation WLI measurement

2013 ◽  
Vol 37 (4) ◽  
pp. 918-923 ◽  
Author(s):  
J. Xie ◽  
X.R. Liu ◽  
K.K. Wu ◽  
Y.J. Lu ◽  
P. Li
Keyword(s):  
Ground Profile ◽  
Profile Accuracy

scholarly journals Evaluation of Different Tools of Precision Finishing for Cold Extruded Sun Gear With Internal-External Tooth Shapes

2021 ◽  
Author(s):  
Zuofa Liu ◽  
Xi Wang ◽  
Wenjie Feng ◽  
Jie Zhou ◽  
Zhiyuan Qu ◽  
...  
Keyword(s):  
Finite Element ◽  
Metal Flow ◽  
Commercial Production ◽  
Cold Extrusion ◽  
Forming Load ◽  
Tool Stress ◽  
Distribution Laws ◽  
Profile Accuracy ◽  
Precision Finishing ◽  
Prediction Strategy

Abstract Due to the complex metal flow in the cold extrusion of sun gear, the teeth accuracy of formed sun gear is poor. In order to improve the accuracy of the extruded sun gear, a novel precision finishing method with different tools was proposed in this study. Finite element simulations were performed using DEFORM, and a new finite element (FE) prediction strategy was developed to obtain an in-depth understanding of the deviation distribution laws of the finished sun gear. Then, the influences of different finishing tools on tooth deformation, tool stress, forming load and tooth accuracy were examined. The investigation results show that the profile accuracy of external gear can be improved from ninth to seventh class, lead accuracy can be enhanced from tenth to eighth class, and total M value deviation of internal spline is reduced to 72.3 μm by the precision finishing method with interference mandrel. Therefore, the interference mandrel is recommended as the optimal reshaping tool for commercial production of sun gears. The simulation results are well agreed with the experimental results, which verifies the feasibility of the precision finishing method and the reliability of the FE prediction strategy.

Influence of the road profile accuracy on disturbance compensation in active suspension systems

2021 ◽  
Vol 69 (6) ◽  
pp. 485-498
Author(s):  
Felix Anhalt ◽  
Boris Lohmann
Keyword(s):  
Ride Comfort ◽  
Feedforward Control ◽  
Active Suspension ◽  
Disturbance Compensation ◽  
Critical Factors ◽  
The Road ◽  
Suspension Systems ◽  
Active Suspension Systems ◽  
Road Profile ◽  
Profile Accuracy

Abstract By applying disturbance feedforward control in active suspension systems, knowledge of the road profile can be used to increase ride comfort and safety. As the assumed road profile will never match the real one perfectly, we examine the performance of different disturbance compensators under various deteriorations of the assumed road profile using both synthetic and measured profiles and two quarter vehicle models of different complexity. While a generally valid statement on the maximum tolerable deterioration cannot be made, we identify particularly critical factors and derive recommendations for practical use.

Analytical Study on Tooth Profile of Non-Circular Gear Based on Hobbing Process Simulation

2019 ◽  
Author(s):  
Jiang Han ◽  
Dazhu Li ◽  
Lian Xia ◽  
Xiaoqing Tian
Keyword(s):  
Process Simulation ◽  
Analytical Study ◽  
Profile Analysis ◽  
Tooth Profile ◽  
Feature Points ◽  
Analysis Method ◽  
High Convergence Rate ◽  
Envelope Method ◽  
Profile Accuracy ◽  
Uniform Accuracy

Abstract Based on the hobbing process simulation of non-circular gears, a method for obtaining the precise tooth profile and evaluating the undercutting characteristics according to the profile generated after the finite number of envelop is proposed. The profile points formed by different hobbing strategies are compared, then the envelope method with uniform accuracy for all teeth is selected. The formation rule of tooth profile morphology is analyzed, and the pickup method with high convergence rate is proposed. The influences of the envelope number and gear parameters on the tooth profile accuracy are analyzed inductively, and the reasonable number of envelopes for expected accuracy is given. The results show that the tooth profile analysis method based on the hobbing process simulation can accurately acquire all feature points of the tooth profile and analysis the undercutting phenomenon.

scholarly journals Identification of Natural Frequency of Low Rise Building on Soft Ground Profile using Ambient Vibration Method

2018 ◽  
Vol 995 ◽  
pp. 012100
Author(s):  
A F Kamarudin ◽  
M H Zainal Abidin ◽  
S N Mokhatar ◽  
M E Daud ◽  
A Ibrahim ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Ambient Vibration ◽  
Soft Ground ◽  
Vibration Method ◽  
Ground Profile

scholarly journals Design and Fabrication of Wafer-Level Microlens Array with Moth-Eye Antireflective Nanostructures

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 747 ◽  
Author(s):  
Shuping Xie ◽  
Xinjun Wan ◽  
Bo Yang ◽  
Wei Zhang ◽  
Xiaoxiao Wei ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Production Efficiency ◽  
Low Cost ◽  
Microlens Array ◽  
Wafer Level ◽  
Lens Array ◽  
Wafer Level Packaging ◽  
High Production ◽  
Aspherical Lenses ◽  
Profile Accuracy

Wafer-level packaging (WLP) based camera module production has attracted widespread industrial interest because it offers high production efficiency and compact modules. However, suppressing the surface Fresnel reflection losses is challenging for wafer-level microlens arrays. Traditional dielectric antireflection (AR) coatings can cause wafer warpage and coating fractures during wafer lens coating and reflow. In this paper, we present the fabrication of a multiscale functional structure-based wafer-level lens array incorporating moth-eye nanostructures for AR effects, hundred-micrometer-level aspherical lenses for camera imaging, and a wafer-level substrate for wafer assembly. The proposed fabrication process includes manufacturing a wafer lens array metal mold using ultraprecise machining, chemically generating a nanopore array layer, and replicating the multiscale wafer lens array using ultraviolet nanoimprint lithography. A 50-mm-diameter wafer lens array is fabricated containing 437 accurate aspherical microlenses with diameters of 1.0 mm; each lens surface possesses nanostructures with an average period of ~120 nm. The microlens quality is sufficient for imaging in terms of profile accuracy and roughness. Compared to lenses without AR nanostructures, the transmittance of the fabricated multiscale lens is increased by ~3% under wavelengths of 400–750 nm. This research provides a foundation for the high-throughput and low-cost industrial application of wafer-level arrays with AR nanostructures.

scholarly journals Ground Profile Recovery from Aerial 3D LiDAR-Based Maps

2019 ◽  
Author(s):  
Adelya Sabirova ◽  
Maksim Rassabin ◽  
Roman Fedorenko ◽  
Ilya Afanasyev
Keyword(s):  
Ground Profile ◽  
3D Lidar
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