An innovative torsional vibration absorber of vehicle powertrain system: Prototype design, performance test, and control experiment

2021 ◽  
pp. 1-33
Author(s):  
Pu Gao ◽  
Hongcai Li ◽  
Hui Liu ◽  
Changle Xiang
Keyword(s):  
Torsional Vibration ◽  
Performance Test ◽  
Control Experiment ◽  
Vibration Absorber ◽  
Design Performance ◽  
Powertrain System ◽  
And Control ◽  
System Prototype ◽  
Prototype Design ◽  
Vehicle Powertrain

scholarly journals A new magnetorheological elastomer torsional vibration absorber: structural design and performance test

2021 ◽  
Vol 12 (1) ◽  
pp. 321-332
Author(s):  
Pu Gao ◽  
Hui Liu ◽  
Changle Xiang ◽  
Pengfei Yan ◽  
Taha Mahmoud
Keyword(s):  
Magnetic Field ◽  
Torsional Vibration ◽  
Performance Test ◽  
Magnetic Circuit ◽  
Circuit Simulation ◽  
Variable Stiffness ◽  
Vibration Absorber ◽  
Vibration Exciter ◽  
Magnetorheological Elastomer ◽  
The Magnetic Field

Abstract. The semi-active torsional vibration absorber can effectively reduce the torsional vibration of the power-train system. In this paper, a new type of variable stiffness torsional vibration absorber with a magnetorheological elastomer (MRE) as an intelligent controlling element is designed, and the modal analysis, frequency-tracking scheme, and damping effects have been studied. A transient dynamic simulation is utilized to validate the rationality of the mechanical structure, the magnetic field parameters of the absorber are matched, and the magnetic circuit simulation analysis and the magnetic field supply analysis are carried out to verify the closed magnetic circuit. The principle prototype of the innovative vibration absorber is manufactured, the magnetic field strength of the absorber is tested by a Gauss meter, and the results show the efficacy of magnetizing the vibration absorber with a conductive slip ring by solving the magnetizing problem of the rotating parts of the vibration absorber. A special-purpose test rig with a torsional vibration exciter as a power source has been implemented. A comparative experiment has been carried out to test the frequency shift characteristics and authenticate the vibration-reduction effect of the new MRE torsional vibration absorber.

Optimization strategy of physical education teaching from the perspective of safety education

2021 ◽  
pp. 002072092110052
Author(s):  
Huibin Niu ◽  
Lefang Wang
Keyword(s):  
Control Experiment ◽  
Processing Method ◽  
Control Group ◽  
Optimization Strategy ◽  
Safety Education ◽  
Knowledge And Skills ◽  
Safety Knowledge ◽  
And Control ◽  
Experimental Group ◽  
Sports Activities

In this paper, from the perspective of safety education, we focus on sports the optimization strategy of curriculum teaching is studied. This paper adopts the methods of questionnaire survey and control experiment. In the study, 770 students' acceptance of safety education and acceptance content were investigated. At the same time, the students were divided into control group and experimental group. In addition, we use the adjustment processing method to analyze the experimental data, through the analysis of the students' safety knowledge, obstacle ability, attitude and frequency of participating in sports activities, and the preferred sports project selection. The results show that 62.1% and 36.6% of the subjects in the control group like and prefer to participate in sports activities, while 75.4% and 81.6% of the subjects in the experimental group like to participate in sports activities and prefer to participate in sports activities, Therefore, safety education can not only help students acquire safety knowledge and skills, but also improve students' enthusiasm to participate in sports activities.

A Comprehensive Test System for Precision Transmission Performance of CORT Reducer

2013 ◽  
Vol 333-335 ◽  
pp. 2448-2451
Author(s):  
Yong Li ◽  
Guang Ma ◽  
Yun De Shen ◽  
Tai Hong Cheng ◽  
Zhen Zhe Li ◽  
...  
Keyword(s):  
Performance Test ◽  
Velocity Ratio ◽  
Test System ◽  
Test Method ◽  
Transmission Performance ◽  
Test Bed ◽  
Comprehensive Test ◽  
Return Difference ◽  
And Control ◽  
Torque Angle

To meet the needs of test for compound oscillatory roller transmission (CORT) reducer, A comprehensive test system for precision transmission performance was designed, the test-bed structure and control principal of which were introduced. First, a transmission performance test method was proposed and focused on the transmission performance of velocity ratio, accuracy, and efficiency. Then, user interface based on LabVIEW program was designed, and the transmission performance of torque, angle, velocity, velocity ratio, return difference, efficiency could be displayed. Finally, measurement example on an E80 type CORT reducer has been made, and shows that the proposed test system is suitable for test for these reducers of high-precision drive, high stiffness, high load characteristics.

scholarly journals Design and Analysis of Trash Monitoring System Prototype Based On Internet of Things (IoT) Using MQTT Protocol

2018 ◽  
Vol 10 (3) ◽  
pp. 113
Author(s):  
Achmad Auliyaa Zulfikri ◽  
Doan Perdana ◽  
Gustommy Bisono
Keyword(s):  
Internet Of Things ◽  
Monitoring System ◽  
System Performance ◽  
Performance Test ◽  
Advanced Technology ◽  
Android Application ◽  
Packet Delivery ◽  
End To End Delay ◽  
System Prototype ◽  
Maximum Limit

On this research,Internet of Things (IoT) as an advanced technology is used to monitor the height of trash from a trash can in order to give notification whether the height of trash is already reach the maximum limit or not yet.To support those needs,we used NodeMCU as microcontroller,ultrasonic sensor,MQTT as IoT protocol,and also Android application to show the data.After we did the system performance test,we got the biggest result of end-to-end delay which is 2.06875 seconds when the packet delivery is set to 1000 ms with 3 active nodes and the smallest result which is 0.26055 seconds when the packet delivery is set to 100 ms with 1 active mode.The biggest result of throughput is 597.17 Bytes/s when the packet delivery is set to 100 ms with 1 active mode and the smallest result is 75.86 Bytes/s when the packet delivery is set to 1000 ms with 3 active nodes.The biggest result of availability and reliability is 99.905% when the packet delivery is set to 1000 ms and the smallest result is 99.833% when the packet delivery is set to 100 ms.

scholarly journals Research on Real Working Condition Simulation and Performance Test of Wind Power Main Bearing Based on Test Bench

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Guodong Zhai ◽  
Xujie Qin ◽  
Xing Yang
Keyword(s):  
Wind Power ◽  
Performance Test ◽  
Test Bench ◽  
Test Results ◽  
Main Bearing ◽  
Loading System ◽  
Modeling Software ◽  
And Performance ◽  
Drive And Control ◽  
And Control

As a renewable energy source, wind energy has received more and more attention, and the wind power industry has also been advocated and developed by countries all over the world. In the production and use of wind turbines, the design and manufacturing technology of wind turbine bearings is very important. In order to ensure the reliable operation of the wind power main bearing after installation and realize the longest life of it, this paper designs a bearing test bench that can test the performance of the wind power main bearing. It can analyze the temperature, displacement, load, and moment of the key parts of the 5 MW wind power main shaft bearing. The solid modeling of the experimental platform was carried out using the 3D modeling software SolidWorks. Hydraulic loading system and test monitoring system are designed to realize the drive and control of the test bench. Through the established mathematical model, the central load of the hub is converted into the axial cylinder load and the radial cylinder load of the test bench to simulate the actual working conditions of the tested bearing. The test results show that the test bench meets various loading requirements and can reliably complete the task of testing wind power main bearings.

Analysis and Control of Unknown In-Vehicle Network System

2012 ◽  
Vol 184-185 ◽  
pp. 1521-1525
Author(s):  
Yu En Wu ◽  
Yu Hui Hu ◽  
Ya Ying Jin ◽  
Jun Qiang Xi
Keyword(s):  
Dynamic Analysis ◽  
Static Analysis ◽  
Effective Control ◽  
Hybrid Powertrain ◽  
Verification Method ◽  
Gateway System ◽  
Powertrain System ◽  
Analytical Protocol ◽  
Key Aspects ◽  
And Control

A CAN-Bus protocol analysis and verification method with three key aspects which are static analysis, dynamic analysis and verification &control is put forward. Static analysis ascertains the communication information of each node by bus residual method; Synchronous contrast method is put in use to obtain practical and effective control protocol in the dynamic analysis; Verification &control is to verify the correctness of the analytical protocol and to achieve the control of the critical subsystems by bus gateway system. This scheme has been used to analyze a foreign parallel hybrid powertrain system, and it proves the correctness of the designed static analysis and dynamic analysis, the applicability of verification &control.

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