With recent enhancements in vehicle electrification, electric sliding doors have received significant research attention; however, the testing methods for the sliding doors components need to be improved. Herein, according to the durability evaluation index of sliding doors, a miniaturized durability test bench is designed for the electronic lock system and sliding door power output mechanism assembly. The motion trajectory of the electronic lock system can be fitted as a circular arc curve through dynamic characteristics analysis; therefore, a four-bar linkage with a flexible link is used to simulate the trajectory. Through the finite element simulation method, the test-bench stress is calculated at room temperature and a high temperature (75°C); this facilitates the selection of an appropriate material (GCr15). This experimental method is an economical, reliable, and accurate scheme to standardize the durability test of the electronic lock system and power output mechanism assembly.
In order to facilitate research and improve application efficiency, scales based on various functions were designed and developed. However, in the process of using the scale, people often ignore the validity of the scale for a specific purpose, resulting in the loss of significance of subsequent studies. This paper briefly introduces the application of correlation analysis and factor analysis in scale validity test, which is enlightening to improve people’s understanding of statistical analysis methods.
With the rapid development of automobile industry, electric door locks have widely used in various vehicle doors, especially for sliding doors. Among all performances, durability performance for electric locks is virtual for safety, so miniaturized durability test bench has been designed in the research according to the national standard of electric lock. Firstly, four-bar linkage mechanism has been adopted as the main actuator for the motion track achievement, the real motion track of sliding door can be guaranteed through the verification of ADAMS simulation. Secondly, the compression test has been carried out to calculate the reaction force of door sealing strips, thus the resistance device of test bench for simulating reliable locking process of electric lock has been designed. The miniaturized durability test bench can replace the existing durability test method which only performed by the whole vehicle testing, thus providing a low-cost and reliable test device for relevant manufacturers.
The breech mechanism is a very important part of artillery with a high failure rate. It is planned to build a test-platform for the investigation of the breech mechanism. By this test-platform the motion of the breech, while the artillery is shooting, can be simulated as the same. While the artillery is shooting, the energy for the opening and shutting action of the breechblock comes from the impact between the breechblock operating cam and crank, when the breech is returning. But this action of a hugely heavy thing is very difficult to simulate. So the negative direction action is considered, which makes the breechblock operating cam moved to impact the crank. In this paper the virtual prototype model based on ADAMS is used to measure the load etc. of the key-parts of the breech mechanism by simulation experimentations.
Pendulum mill is a widely used grinding equipment in powder processing industry. Less in-depth studies have been carried out especially for grinding efficiency and wear. Through theoretical analysis, the main influencing parameters were screened, among which spindle speed and spade degree mainly affect the grinding efficiency, but wind velocity mainly causes the main duct wear. The Fluent-DEM co-simulation method is used for the study of the complex physical field of mill operation. The simulation shows that grinding efficiency increases with spindle speed, but the increase from 110 to 120 rev/min is not significant, so the choice of spindle speed should consider both grinding efficiency and energy consumption. The spade degree determines the spade position, the closer the spade is to the grinding roller, the higher the grinding efficiency. Wind velocity has little effect on grinding efficiency, but it does affect the likelihood of particles entering the main duct and causing wear. Multi-objective optimization determines a spindle speed of 110 rev/min and a spade angle of −12° at a wind velocity of 46 m/s to achieve maximum grinding efficiency and minimum wear. This study provides a digital analysis basis for optimizing the operating parameters of the pendulum mill.
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