scholarly journals Competing failure analysis of aircraft connecting-rod-type cabin door retraction mechanism with intermission considered

2021 ◽  
Vol 39 (5) ◽  
pp. 1105-1113
Author(s):  
Jingyi LIU ◽  
Yugang ZHANG ◽  
Xinchen ZHUANG ◽  
Huan PANG
Keyword(s):  
Working Condition ◽  
Degradation Process ◽  
The Novel ◽  
Failure Model ◽  
Connecting Rod ◽  
Engineering Project ◽  
Wear Model ◽  
Failure Characteristics ◽  
Degradation Failure ◽  
Working Principle

A novel competing failure model considering intermission is established in this paper, which is appropriate for aircraft connecting-rod-type cabin door retraction mechanism. Poisson process, Archard wear model and failure functions are integrated to describe the catastrophic failure and degradation failure of the aircraft mechanism. Intermission is introduced in the novel competing failure model after considering the actual working condition and working factors. Based on the analysis of mechanism working principle and failure characteristics, a certain aircraft connecting-rod-type cabin door retraction mechanism is studied as an example. The case results indicate that this mechanism has an unusual degradation process. Besides, the novel competing failure model with intermission is effective in engineering project.

A PCOT Monitoring System Based on Virtual Instrument Technology

2013 ◽  
Vol 823 ◽  
pp. 241-246
Author(s):  
Ting Guo ◽  
Man Gong ◽  
Lei Xin Nie ◽  
Gen Ming Zhou
Keyword(s):  
Monitoring System ◽  
Experimental Verification ◽  
Virtual Instrument ◽  
Working Condition ◽  
Technical Support ◽  
Temperature Monitoring ◽  
Connecting Rod ◽  
Experimental Prototype ◽  
Working Principle ◽  
Instrument Technology

in order to monitoring connecting rod and crank pin bearings working condition, the PCOT monitoring system which was named crank pin oil temperature monitoring system was developed based on virtual instrument technology. The bearings working condition was estimated by testing oils temperature splashed from the connecting rod and crankshaft. The function, working principle and structure composition were described, and corresponding experimental prototype was researched. After experimental verification, this system could monitoring the crank pin oil temperature in a steady and reliable state, provided technical support for testing bearings faults.

CAD AND CAE TECHNOLOGIES OF A NOVEL PLANE SIX-BAR SWAYING MACHINE

2008 ◽  
Vol 07 (01) ◽  
pp. 65-67
Author(s):  
CHANGPING ZOU ◽  
LI DU ◽  
XIANDE HUANG
Keyword(s):  
High Pressure ◽  
Kinetic Analysis ◽  
Rotational Speed ◽  
Preliminary Analysis ◽  
Unit Weight ◽  
The Novel ◽  
Parameterized Modeling ◽  
New Type ◽  
Working Principle ◽  
Key Dimensions

A new type of six-bar swaying machine was put forward, which is an ingenious combination of plane multi-bar mechanism and high pressure oil cylinder. Preliminary analysis shows that this machine has many advantages, such as the torque produced by its unit weight, its small size, its light deadweight, etc. Thus it can be applied to situations that need swaying mechanism with low rotational speed and great torque. Firstly, the mechanism composition and working principle of the swaying machine were introduced. Secondly, parameterized modeling of the mechanism was carried out by utilizing software ADAMS. Then kinematic analysis and kinetic analysis were completed by using ADAMS. Finally, key dimensions were adjusted according to kinetic analysis. These tasks are believed to be beneficial to the development of the novel transmission.

scholarly journals Removal of Microcystin-LR by a Novel Native Effective Bacterial Community Designated as YFMCD4 Isolated from Lake Taihu

Toxins ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 363 ◽  
Author(s):  
Fei Yang ◽  
Jian Guo ◽  
Feiyu Huang ◽  
Isaac Massey ◽  
Ruixue Huang ◽  
...  
Keyword(s):  
Bacterial Community ◽  
High Performance ◽  
Lake Taihu ◽  
Degradation Process ◽  
Alcaligenes Faecalis ◽  
Natural Ecosystem ◽  
The Novel ◽  
Bacterial Strains ◽  
Different Temperatures ◽  
Cost Efficient

Microcystin-LR (MC-LR) is the most toxic and frequently detected monocyclic heptapeptide hepatotoxin produced by cyanobacteria, which poses a great threat to the natural ecosystem and public health. It is very important to seek environment-friendly and cost-efficient methods to remove MC-LR in water. In this study, the MC-degrading capacities of a novel indigenous bacterial community designated as YFMCD4 and the influence of environmental factors including various temperatures, MC concentrations and pH on the MC-degrading activities were investigated utilizing high-performance liquid chromatography (HPLC). In addition, the MC-degrading mechanism of YFMCD4 was also studied using HPLC coupled with a mass spectrometry equipped with electrospray ionization interface (HPLC-ESI-MS). The data showed MC-LR was completely removed at the maximum rate of 0.5 µg/(mL·h) under the optimal condition by YFMCD4. Two pure bacterial strains Alcaligenes faecalis and Stenotrophomonas acidaminiohila were isolated from YFMCD4 degraded MC-LR at a slower rate. The MC-degrading rates of YFMCD4 were significantly affected by different temperatures, pH and MC-LR concentrations. Two intermediates of a tetrapeptide and Adda appeared in the degradation process. These results illustrate that the novel YFMCD4 is one of the highest effective MC-degrading bacterial community, which can completely remove MC-LR and possesses a significant potential to treat water bodies contaminated by MC-LR.

scholarly journals Mechanical Vibration Mechanism Motion Simulation of Ultrasonic Composite Vibration Polishing Equipment

2018 ◽  
Vol 237 ◽  
pp. 01014
Author(s):  
Wan Hongqiang ◽  
Han Peiying ◽  
Ge Shuai ◽  
Fancong Li ◽  
Zhang Simiao
Keyword(s):  
Theoretical Analysis ◽  
Theoretical Basis ◽  
Mechanical Vibration ◽  
Motion Simulation ◽  
Connecting Rod ◽  
Adams Software ◽  
Piston Mechanism ◽  
Working Principle ◽  
Vibration Mechanism ◽  
Ansys Workbench

In order to design a kind of mechanical vibration part with stable motion in ultrasonic composite vibration polishing equipment. firstly, the main working principle of ultrasonic composite vibration polishing equipment is briefly introduced. Secondly, the mechanical vibration structure of the design is analyzed theoretically, again, using ADAMS software to simulate the crankshaft connecting rod piston mechanism. When the crankshaft speed is 750r/min, the stroke of the piston is 90mm, which is similar to the theoretical analysis value. Finally, using ANSYS Workbench software to analyze the crankshaft statics. The analysis shows that the design of the mechanical vibration structure is reasonable, which provides a theoretical basis for the study of the mechanical vibration structure of ultrasonic composite vibration polishing equipment.

Research on Dynamic Characteristics of Anti-Reverse Valve for Hydraulic Excavator Rotary Motor

2013 ◽  
Vol 871 ◽  
pp. 290-295
Author(s):  
Yan Lei Luo ◽  
Cong Guo Xu ◽  
Qiu Yan Zhang
Keyword(s):  
Dynamic Characteristics ◽  
Hydraulic System ◽  
Working Condition ◽  
Great Influence ◽  
Hydraulic Excavator ◽  
Middle Chamber ◽  
Working Principle ◽  
The Impact ◽  
Rotary Motor ◽  
Amesim Simulation

Hydraulic excavator slewing system is an important component of the excavator and its core-component is the rotary motor. When the rotary hydraulic system starts, stops, and reciprocating works, dynamic characteristic of rotary motor anti-reverse valve has a great influence for working condition of the whole system. Through researching working principle of hydraulic system anti-reverse valve, establish dynamic mathematical model of anti-reverse valve, analyze dynamic response of the model, and get the theoretical foundation of the impact of anti-reverse valve middle chamber throttle opening on hydraulic system. According to the actual working condition of the excavator slewing hydraulic system, establish the system AMESim simulation model, take different parameters of the anti-reverse valve throttle opening, conduct simulation and analysis of the anti-reverse valve characteristics, and validate throttle opening has a great influence on dynamic characteristics of the hydraulic system.

The Static Analysis of the Parallel Bars of the Crankshaft of a Mini Air Compressor on ANSYS

2013 ◽  
Vol 397-400 ◽  
pp. 344-354
Author(s):  
Yao Bing Wei ◽  
Zhen Zhen Qu
Keyword(s):  
Static Analysis ◽  
Mechanical Model ◽  
Working Condition ◽  
Stress And Strain ◽  
Reciprocating Compressor ◽  
Static Characteristics ◽  
Connecting Rod ◽  
Air Compressor

Mechanical model of crankshaft and connecting rod mechanism of reciprocating compressor was built. Then the order of stress was obtained every ten degrees while crankshaft turning. The larger stress of crankshaft initial turnings was utilized to calculate the whole model and the unreliable region and destructive working condition then was determined. The situation was simulated with ANALYS and the static characteristics, i.e. stress and strain, of the crankshaft was also obtained. The simulated results testify the analysis and the results of the paper have great value for reference when designing crankshafts.

The Analysis and Treatment to Lube Oil Separator’s Leakage

2011 ◽  
Vol 328-330 ◽  
pp. 734-737
Author(s):  
Shu Ye Sun ◽  
Guo Yong Zhang
Keyword(s):  
Working Condition ◽  
Basic Structure ◽  
Oil Leakage ◽  
Good Working ◽  
Failure Point ◽  
Working Principle ◽  
Working Performance ◽  
Sealing Elements

The lube oil separator is widely used in lube oil system of merchant vessel. The lube oil separator functions to purify the lube oil to ensure its good working performance. The working condition of the oil separator will greatly influence the normal running of many plants. The lube oil separator used in our laboratory is Mitsubishi SJ700. In the processing of purifying, oil leakage from the water outlet is found. In order to find failure point, the basic structure and the working principle of the separator is introduced. The separator is dismantled according to the procedure. After cleaning some parts found dirty and replacing some sealing elements, the separator is reassembled. When starting the separating process again, the failure remains. Through further analyzing the structure and working principle of the separator, the trouble spot is found out. After removing the failure, the separator finally is repaired. To prevent similar accident occurring again, some suggestions are presented.

scholarly journals Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self-Propelled Round Bit

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Kun Bo ◽  
Siyuan Sun ◽  
Yong Hu ◽  
Maosen Wang
Keyword(s):  
Oil And Gas ◽  
Vertical Section ◽  
Dynamics Simulation ◽  
Chamber Pressure ◽  
Design Parameters ◽  
The Novel ◽  
Directional Drilling ◽  
Pressure Impact ◽  
Working Principle ◽  
And Performance

Although pneumatic down-the-hole (DTH) hammers have good performance of high penetration rate and minimal deviation tendency in the vertical section of oil and gas wells, they have not been successfully used in directional drilling due to drill tool wear and wellbore disturbance. Herein, we developed a novel type of pneumatic DTH hammer with a self-propelled round bit to overcome the technical difficulties of directional drilling. Nonlinear dynamic modeling developed by the authors was used to analyze the working principle and performance of the novel DTH hammer. The kinematics and dynamics simulation of this hammer were carried out using MATLAB language, and the motion law of the piston was revealed. The performance of the novel hammer was numerically simulated and evaluated by considering fluctuations of the front and rear chamber pressure, impact energy, acceleration, and frequency. The results show that our novel DTH hammer’s working principle is feasible and has an adequate structural design. The simulation results demonstrate reasonable design parameters. Compared to the numerical results for conventional DTH hammers, the velocity and acceleration of the piston of the novel hammer changed smoothly. The frequency was slightly higher than that of conventional hammers, while other parameters were nearly equal. The novel DTH hammer can be used in directional drilling, trenchless drilling, and seabed sampling drilling.

scholarly journals In-Situ Bubble Stretching Assisted Melt Extrusion for the Preparation of HDPE/UHMWPE/CF Composites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2054
Author(s):  
Xiaochun Yin ◽  
Youhua Yin ◽  
Di Cheng ◽  
Yanhong Feng ◽  
Guizhen Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
The Novel ◽  
Melt Extrusion ◽  
Ultrahigh Molecular Weight ◽  
The Matrix ◽  
Method Effects ◽  
Working Principle ◽  
Extrusion Method

In this work, a novel melt extrusion method under synergy of extensional deformation and in-situ bubble stretching (ISBS) and corresponding apparatus were reported. The structure and working principle were introduced in detail. Polymer composites composed of high density polyethylene (HDPE)/ultrahigh molecular weight polyethylene (UHMWPE)/carbon fiber (CF) were prepared by using this new method. Effects of CF and Azodicarbonamide (AC) contents on composites’ morphology, rheological, thermal, and mechanical properties were experimentally investigated. SEM results showed that the CFs dispersed evenly in the matrix when the AC content was relatively high. DSC results showed that co-crystallization of HDPE and UHMWPE occurred in the composites, and the Xc of the composites decreased with the addition of AC or under high CF loadings. TGA results showed that the thermostability of the composites increased markedly with increasing CF loading. Mechanical properties showed that tensile strength increased by 30% with 9 wt % CF and 0.6 wt % AC added. The results aforementioned indicate that the novel melt extrusion method is a green and effective way to prepare HDPE/UHMWPE/CF composites.

Simulation-Based Performance Degradation Prognostics of Electro-Hydraulic Servo Valve

2014 ◽  
Vol 716-717 ◽  
pp. 1114-1117
Author(s):  
Zi Tan Zhao ◽  
Jian Bin Guo
Keyword(s):  
Degradation Process ◽  
Performance Degradation ◽  
Simulation Experiments ◽  
Servo Valve ◽  
Model Based ◽  
Degradation Failure ◽  
Simulation Based ◽  
Hydraulic Servo

Simulation-based performance degradation prognostics should firstly obtain the judgment criterion to predict degradation failure, how systems or its components degenerate, and then how to display effect of degradation process on performance. In this paper, we presented a model-based performance degradation prognostic method to address this problem. For Electro-Hydraulic servo valve case, it has strict demands on performance. Degradation of the valve is propagated forward in time and influence on performance output. The proposed degradation prognostics method is illustrated through performing comprehensive simulation experiments.

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