scholarly journals Structure Parameters Optimization Analysis of Hydraulic Hammer System

2012 ◽  
Vol 02 (04) ◽  
pp. 137-142 ◽  
Author(s):  
Guoping Yang ◽  
Jian Fang
Keyword(s):  
Parameters Optimization ◽  
Structure Parameters ◽  
Optimization Analysis ◽  
Hydraulic Hammer

Optimization Design and Analysis for Pre-Shift Control Parameters of Wet Dual Clutch Transmissions Based on Dynamic Modeling of Synchronizer

2019 ◽  
Author(s):  
Ke Zheng ◽  
Jianjun Hu ◽  
Bangzhi Wu ◽  
Yin Wang
Keyword(s):  
Energy Loss ◽  
Optimization Design ◽  
Cone Angle ◽  
Optimization Method ◽  
Parameters Optimization ◽  
Hydraulic Loss ◽  
Structure Parameters ◽  
Control Parameters ◽  
Shift Quality ◽  
Trigger Time

Abstract The DCTs have increased in prevalence for achieving power uninterrupted shifting and pre-shift process significantly influences the DCTs shift quality. Research on the multistage and nonlinear characteristics of the gear preselect process is not comprehensive so that there are shortcomings such as high impact, long synchronization time and poor economy. In view of above detrimental phenomenon, control parameters optimization is conducted in order to realize fast, smooth and economic pre-shifting on the basis of analyzing the sensitivity of the factors affecting pre-shift process. Considering the engagement of sleeve, synchro ring and dog gear, the multi-body dynamics theory is applied to establish an accurate synchronizer dynamics model. Based on the model, simulations are conducted to confirm factors like sleeve mass, cone angle fluctuating the pre-shift quickness and smoothness, sorting structure parameters according to factors sensitivity. Furthermore, the formula of energy loss characteristics relating to two control parameters which are pre-shift force and pre-shift trigger time is obtained, deriving from exploring the hydraulic loss caused by pre-shift force and the drag torque energy loss created by pre-shift trigger time. The optimal synchronizer structure parameters are obtained by adopting multi-objective optimization method. Simulation results indicate the optimal control parameters improve pre-shift comprehensive performance including quickness, smoothness and economy compared with conventional scheme.

The Optimization Analysis on Piezoelectric Micromixer With Modified Tesla Tubes

2011 ◽  
Author(s):  
Xiuhua He ◽  
Hongcai Zhuo ◽  
Xulian Deng ◽  
Jian Wang ◽  
Fu Li
Keyword(s):  
Numerical Analysis ◽  
Piezoelectric Actuator ◽  
Structure Parameters ◽  
Optimization Analysis ◽  
Two Fluids ◽  
Mesh Model ◽  
Perfect Mixing ◽  
Working Principle ◽  
Working Performance ◽  
L1 And L2

With consideration of the good configuration of Tesla tube and its perfect performance used in micromixer and micropump, an integration of micromixer and micropump, a novel type of piezoelectric micromixer has been designed. In order to improve the performance of the micromixer, analysis on structure parameters of the Tesla tube, and the optimization on it is the chief work in this paper. Firstly, a novel type of piezoelectric micromixer with Tesla tubes and piezoelectric actuator has been designed, and its structure and working principle were described. Secondly, the numerical analysis on the micromixer with prearranged parameters was carried out to analyze its pumping and mixing performances. Thirdly, an optimization on the structure to improve its performance was carried out. The values of three main structure parameters of the Tesla tube, K = W1/W3, L1 and L2 were changed to analyze their effects on λ and σ which stand for pumping and mixing performances respectively, then two groups perfect values of those three parameters were selected for optimization. Finally, a perfect design scheme was selected to be structure of mixer; numerical analysis was carried out on it in application of dynamic mesh model. Two fluids arrived perfect mixing after 0.4s with the value of Reynolds number 200, at driven frequency 100Hz, middle displacement amplitude of piezoelectric actuator 15μm. This result demonstrates that, pumping and mixing performances of the piezoelectric micromixer were validated, and its working performance has been improved with the optimization on Tesla tubes, which can be reference for study afterward.

Design and Simulation of Bi-Directional Hydraulic Lock Used in Hydraulic System for Controllable Pitch Propeller

2012 ◽  
Vol 468-471 ◽  
pp. 852-856
Author(s):  
Shuai Huang ◽  
Jing Li ◽  
Jin Feng Zhang ◽  
Yun Chen ◽  
Yao Bao Yin
Keyword(s):  
Modeling And Simulation ◽  
Hydraulic System ◽  
Dynamic Performance ◽  
Hydraulic Cylinder ◽  
Parameters Optimization ◽  
Structure Parameters ◽  
Large Flow

This paper designs a bi-directional hydraulic lock used in a large flow hydraulic system for controllable pitch propeller. The lock is used to resist the hydraulic cylinder shifting when the pitch reaches the presetting situation. The structure parameters of the lock are obtained by static design, and the dynamic performance of it is analyzed by modeling and simulation with the system on rated load. The dynamic simulating discovers the faults of the lock designing by static calculating and the results provide sufficient supports for its parameters optimization.

Study of a Lithium Battery Automatic Shell Control System Algorithm

2015 ◽  
Vol 738-739 ◽  
pp. 1039-1047
Author(s):  
Xian Ming Liu ◽  
Guo Ping Liu
Keyword(s):  
Lithium Battery ◽  
Parameters Optimization ◽  
Practical Significance ◽  
Kinematics And Dynamics ◽  
Structure Parameters ◽  
Important Process ◽  
Nsga Ii ◽  
Core Set ◽  
Complete Set ◽  
Machine Structure

set of shell is an important process on lithium battery production line. Research is applicable to automatic set of lithium battery shell of an organization, the installed baffle set into the very core of battery shell, do not harm the very core, set into the very core of the exposed aluminum shell of the same length. This article put forward from the aspects of kinematics and dynamics of multiple optimization objectives, work in a given space and a variety of constraint conditions, with the aid of the NSGA - II algorithm to complete set of shell machine structure parameters optimization, experiments show that the casing precision of the equipment, set of shell and the percent of pass is up to 99 above, has a certain practical significance.

scholarly journals Optimization of Structure Parameters of the Grouser Shoes for Adhesion Reduction under Black Soil

Agriculture ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 795
Author(s):  
Jun Fu ◽  
Jian Li ◽  
Xinlong Tang ◽  
Ruixue Wang ◽  
Zhi Chen
Keyword(s):  
Adhesion Force ◽  
Reference Method ◽  
Soil Mass ◽  
Black Soil ◽  
Parameters Optimization ◽  
Structure Parameters ◽  
Tracked Vehicles ◽  
Average Value ◽  
Adhesion Ability ◽  
Adhesion Performance

The black soil of Northeast China has a strong adhesion ability because of its unique physical properties, and the soil often adheres to the surface of the grouser shoes of tracked vehicles during the operation. The adhesion performance depends largely on structure parameters of the grouser shoes. The grouser height, the grouser thickness, and the grouser splayed angle were selected as structure parameters. The adhesion force and adhesive soil mass were selected as indicators of adhesion performance. Therefore, the mathematical model between structure parameters and response indicators was established by the response surface method (RSM). The optimal parameters combination was that the grouser height was 20 mm, grouser thickness was 6.34 mm, and grouser splayed angle was 40.45°. The average data of verification experiments occurred when the adhesion force reached 1.11 kPa and adhesive soil mass reached 22.68 g. Compared with the average value of un-optimized experiment results, the adhesion force and adhesive soil mass reduced by 12.84% and 4.63%, respectively. The relative error of the predicted values and measured values was less than 5%, proving the reliability of the regression models. This study could provide a reference method for parameters optimization, and a new structure of the grouser shoes of tracked vehicles will be designed to reduce adhesion.

Optimization analysis of structure parameters of steam ejector based on CFD and orthogonal test

Energy ◽  
2018 ◽  
Vol 151 ◽  
pp. 79-93 ◽  
Author(s):  
Yifei Wu ◽  
Hongxia Zhao ◽  
Cunquan Zhang ◽  
Lei Wang ◽  
Jitian Han
Keyword(s):  
Orthogonal Test ◽  
Structure Parameters ◽  
Optimization Analysis ◽  
Steam Ejector

Optimization analysis of structure parameters of downhole vortex tool based on CFD and orthogonal studies

2020 ◽  
Vol 190 ◽  
pp. 107030
Author(s):  
Yonghui Liu ◽  
Chuan Xie ◽  
Xiaoping Li ◽  
Guangliang Lu ◽  
Lei Tang ◽  
...  
Keyword(s):  
Structure Parameters ◽  
Optimization Analysis
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