On vibration control with Stewart parallel mechanism

Ren, Gexue; Qiuhai, Lu; Hu, Ning; Ren, Nan; Peng, Bo

doi:10.1016/s0957-4158(02)00092-2

Cited by 39 publications

(11 citation statements)

References 12 publications

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“…Since the high cost of the ultrasonic application, the sub-sonic vibration was firstly applied by a high-speed motor through a harmony vibration process of the solid cover. It is believed that the harmony vibration shall be able to remove the solid cover [7,8].…”

Section: Thermocouple Vibration (Ultrasonic and Sub-sonic) Cleaning Amentioning

confidence: 99%

Innovative Instrumentation and Analysis of the Temperature Measurement for High Temperature Gasification

Lee¹

2004

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The systematic tests of the gasifier simulator were conducted in this reporting period. In the systematic test, two (2) factors were considered as the experimental parameters, including air injection rate and water injection rate. Each experimental factor had two (2) levels, respectively.A special water-feeding device was designed and installed to the gasifier simulator. Analysis of Variances (ANOVA) was applied to the results of the systematic tests. The ANOVA shows that the air injection rate did have the significant impact to the temperature measurement in the gasifier simulator. The ANOVA also shows that the water injection rate did not have the significant impact to the temperature measurements in the gasifier simulator. The ANOVA analysis also proves that the thermocouple assembly we proposed was immune to the moisture environment, the temperature measurement remained accurate in moisture environment.Within this reporting period, the vibration application for cleaning purpose was explored.Both ultrasonic and sub-sonic vibrations were considered. A feasibility test was conducted to prove that the thermocouple vibration did not have the significant impact to the temperature measurements in the gasifier simulator. This feasibility test was a 2 2 factorial design. Two factors including temperature levels and motor speeds were set to two levels respectively. The sub-sonic vibration tests were applied to the thermocouple to remove the concrete cover layer (used to simulate the solid condensate in gasifiers) on the thermocouple tip. It was found that both frequency and amplitude had significant impacts on removal performance of the concrete cover layer.iii

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Section: Thermocouple Vibration (Ultrasonic and Sub-sonic) Cleaning Amentioning

confidence: 99%

Innovative Instrumentation and Analysis of the Temperature Measurement for High Temperature Gasification

Lee¹

2004

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“…Generally, burrs have been removed by method of physics and chemistry. There are a few publications in the area of applying ultrasonic to deburring [16][17][18].…”

Section: Experimental Designmentioning

confidence: 99%

Innovative Instrumentation and Analysis of the Temperature Measurement for High Temperature Gasification

Lee¹

2006

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The results show that the ultrasonic approach is one of the best methods to clean the thermocouple tips during the routine operation of the gasifier. In addition, the real time data acquisition system was also designed and applied in the experiments. This advanced instrumentation provided the efficient and accurate data acquisition for this project.In summary, the accomplishment of the project provided useful information of the ultrasonic cleaning method applied in thermocouple tip cleaning. The temperature measurement could be much improved both in accuracy and duration provided that the proposed approach is widely used in the gasification facilities.v

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“…Researches on the reduction vibration of parallel mechanism around the world concentrate on the followed aspects. Emdadul Hoque, Gexue R, Lvzhong M and Qizhi Y [1][2][3][4] replaced the traditional active vibration isolation system with the parallel mechanism and carried on the theoretical analysis and experimental verification. Thomas H, Lvzhong M and Wenjiang D [5][6][7] designed parameters of damping devices of the suspension system based on the parallel mechanism according to the sensitive frequency range of the human body and the natural frequency of the vehicle.…”

Section: Introductionmentioning

confidence: 99%

Test and Simulation Analysis on the Multidimensional Reduction

Min¹

2015

TOAUTOCJ

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Abstract:The vibration velocities of the seat platform and traditional mechanical reduction vibration device were measured through tests, which provided certain basis for proposing and design of the parallel mechanism with six degree of freedom in subsequent paragraphs. Adopting the parallel mechanism as the main part of the seat and the active joints with spring damping elements as the reduction vibration actuator, the reduction vibration seat model with the 3-PRPS parallel mechanism with six degree of freedom was established. With position and attitude of the mechanism as the premise, stability indexes of the reduction vibration seat in motion were put forward, and then getting the task space of moving platform by the inverse solution of the mechanism position. To achieve reduction vibration effectively, branched chain velocity matrix was built by vector method. Optimal parameter values were obtained by MATLAB numerical calculation to improve the reduction vibration space and flexibility. Finally, simulation analysis was carried out on the results. Meanwhile, comparison was carried out on the reduction vibration effects of the parallel mechanism with six degree of freedom and traditional mechanical reduction vibration device. The results show that this mechanism has a better vibration reduction performance, which provides a new thought for designing reduction vibration seat. Meanwhile, it also provides important reference for application and research of other parallel mechanisms.

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On vibration control with Stewart parallel mechanism

Cited by 39 publications

References 12 publications

Innovative Instrumentation and Analysis of the Temperature Measurement for High Temperature Gasification

Innovative Instrumentation and Analysis of the Temperature Measurement for High Temperature Gasification

Innovative Instrumentation and Analysis of the Temperature Measurement for High Temperature Gasification

Test and Simulation Analysis on the Multidimensional Reduction

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