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Test analysis on relationship between anti-vibration performanceand chaos characteristics of vehicle suspension

Journal of Southeast University(English Edition) 2006年第1期22卷 64-68页

作者：张雨任成龙南京工程学院机械工程系南京210013 长沙理工大学载运工具运用工程研究所长沙410076

Based on the primary principle of anti-vibration on vehicles, a chaos description on the vibration in suspensions is put forward. The vibration curve of the suspensions of test vehicles is obtained based on the data from a test rig for vehicle braking vs. suspension anti-vibration efficiency. The system parameters such as first inherent frequency and damp rate, as well as the chaos parameters such as the minimum embedding dimension and correlation dimension, are calculated by the vibration curve. The relationship among anti-vibration performance, chaos parameters and system parameters of vehicle suspension is presented. The research results show that the minimum embedding dimension Mmin can be used to estimate the change of the anti-vibration performance of the front suspension of the off-road jeep. The smaller Min is, the worse anti-vibration performance is. The corresponding stiffness and damp of the front suspension of the off-road jeep is smaller. Correlation dimension D2 can be used to identify different suspension types such as those of the off-road jeep and the car. The D2 of the off-road jeep is larger than the one of the car.

关键词： vehicle suspension anti-vibration chaos

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Design and experiment of anti-vibrating and anti-wrapping rotary components for subsoiler cum rotary tiller

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International Journal of Agricultural and Biological Engineering 2019年第4期12卷 47-55页

作者： Kan Zheng Allen D.McHugh Hongwen Li Qingjie Wang Caiyun Lu Hongnan Hu Wenzheng Liu Zhiqiang Zhang Peng Liu Jin He College of Engineering China Agricultural UniversityBeijing 100083China International Maize and Wheat Improvement Centre(CIMMYT) Dhaka 1213Bangladesh

The commonly used subsoiling cum rotary tiller machine(SRT)in Northern China is a combination of subsoiler and horizontal rotary tiller,however backfilling of the subsoiling slot,excessive vibration and plant residue wrapping on rotary components has been rarely ***,the rotary components and assembly were redesigned to address these issues and to an SRT fitted with IT225 short curve rotary blades behind the V-shape subsoiling slots and IIT245 long curve rotary blades between the *** and short blades were fitted on a rotor in a double helix,with optimal spiral angles of 65° and 90°,and phase angle of 147°and 180°,*** with the commonly used SRT(CSRT),the additional anti-wrapping cutting blades in the circumferential and axial direction of ASRT could remove hanging residue on the blade holders,wrapping on the rotor and formation of an isolation ***,the cutting edge curve of anti-wrapping cutting blades was an exponential *** tests demonstrated that the redesigned SRT with anti-vibrating and anti-wrapping rotary components(ASRT)had was a significant advancement over the ***,the working depth of rotary tillage was more stable,while other observations confirmed that backfilling of the subsoiling slot was also improved.

关键词： subsoiling rotary tiller anti-vibration anti-wrapping backfill tillage

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A Magnetically Levitated Precise Pointing Mechanism for Application to Optical Communication Terminals

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Optics and Photonics Journal 2012年第2期2卷 85-97页

作者： Thomas Edward Donaldson Frame Alexandre Alexandre Pechev Surrey Space Centre University of Surrey Guildford UK

Increasing data bandwidth requirements from spacecraft systems is beginning to pressure existing microwave communications systems. Free-Space optical communications allows for larger bandwidths for lower relative power consumption, smaller size and weight when compared to the microwave equivalent. However optical communication does have a formidable challenge that needs to be overcome before the advantages of the technology can be fully utilized. In order for the communication to be successful the transmitter and receiver terminals need to be pointed with a high accuracy (generally in the order of ≤10 μradians) for the duration of communication. In this paper we present a new concept for the precise pointing of optical communications terminals (termed the Precise Pointing Mechanism). In this new concept we combine the separate pointing mechanisms of a conventional optical terminal into a single mechanism, reducing the complexity and cost of the optical bench. This is achieved by electromagnetically actuating the whole telescope assembly in 6 degrees-of-freedom with an angular resolution of less than ±3 μradians within a 10 (Az. El.) field of view and linear resolution of ±2 μm. This paper presents the new pointing mechanism and discusses the modelling, simulation and experimental work undertaken using the bespoke engineering model developed.

关键词： Optical Communications Magnetic Levitation Control Pointing Active anti-vibration

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