Decoupled Controller Design of an Autonomous Underwater Vehicle and Performance Test Results

Predicting the hydrodynamic coefficients of an autonomous underwater vehicle (AUV) is important during vehicle design. SUT-2 is an AUV, being developed by the Marine Engineering Research Center of Sharif University of Technology in Iran (MERC). Model tests are done in the marine engineering laboratory towing tank. In this research, hydrodynamic coefficients are calculated using model test results of an autonomous underwater vehicle. Hydrodynamic forces are also analyzed. These coefficients are used for dynamic modeling and autonomous controller design.

Download Full-text

Physical and performance characteristics related to starter status, position, and division in Japanese collegiate American-football players

Isokinetics and Exercise Science ◽

10.3233/ies-200222 ◽

2021 ◽

pp. 1-8

Author(s):

Junta Iguchi ◽

Minoru Matsunami ◽

Tatsuya Hojo ◽

Yoshihiko Fujisawa ◽

Kenji Kuzuhara ◽

...

Keyword(s):

Performance Test ◽

Vertical Jump ◽

American Football ◽

Football Players ◽

Jump Height ◽

Test Results ◽

Repetition Maximum ◽

Vertical Jump Height ◽

Division 1 ◽

And Performance

BACKGROUND: Few studies have investigated the variations in body composition and performance in Japanese collegiate American-football players. OBJECTIVE: To clarify what characterizes competitors at the highest levels – in the top division or on the starting lineup – we compared players’ body compositions and performance test results. METHODS: This study included 172 players. Each player’s body composition and performance (one-repetition maximum bench press, one-repetition maximum back squat, and vertical jump height) were measured; power was estimated from vertical jump height and body weight. Players were compared according to status (starter vs. non-starter), position (skill vs. linemen), and division (1 vs. 2). Regression analysis was performed to determine characteristics for being a starter. RESULTS: Players in higher divisions and who were starters were stronger and had more power, greater body size, and better performance test results. Players in skill positions were relatively stronger than those in linemen positions. Vertical jump height was a significant predictor of being a starter in Division 1. CONCLUSION: Power and vertical jump may be a deciding factor for playing as a starter or in a higher division.

Download Full-text

Initial Operation and Performance Test Results of The Accelerator System String Test (Asst) Cryogenic System

Supercollider 5 ◽

10.1007/978-1-4615-2439-7_109 ◽

1994 ◽

pp. 455-458

Author(s):

Ted Kobel ◽

Roberto Than

Keyword(s):

Performance Test ◽

Cryogenic System ◽

Test Results ◽

Initial Operation ◽

String Test ◽

And Performance ◽

Accelerator System

Download Full-text

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

Mathematical Problems in Engineering ◽

10.1155/2021/6623988 ◽

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.

Download Full-text