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Mechanical systems and signal processing 24건

  1. [해외논문]   Editorial Board   SCIE SCOPUS


    Mechanical systems and signal processing v.109 ,pp. ii - ii , 2018 , 0888-3270 ,

    초록

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  2. [해외논문]   Performance-oriented controls of a novel rocker-pushrod electromagnetic active vehicle suspension   SCIE SCOPUS

    Gu, Cheng (Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China ) , Yin, Jun (Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China ) , Luo, Jie (Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China ) , Chen, Xinbo (Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China ) , Wang, Junmin (Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus, OH 43210, USA)
    Mechanical systems and signal processing v.109 ,pp. 1 - 14 , 2018 , 0888-3270 ,

    초록

    Abstract This paper presents a novel active vehicle suspension rocker-pushrod electromagnetic actuator (EMA) that has the features of easy manufacturing and modular design. Considering the nonlinear influence of the reducer on unsprung mass and the nonvertical arrangement of the spring, parameter perturbation bounds are determined through analysis. To provide drivers with more choices and driving pleasure, performance-oriented controllers are designed by frequency shaping in the sense of H ∞ norm, generating comfort mode, sport mode and hybrid mode respectively. Vehicle suspension performances under different modes are compared in both frequency and time domains, while the system robustness against parametric variations is verified by 81 perturbed systems. To verify the improvement of ride comfort and handling stability, a quarter-vehicle prototype is constructed. Test results show that when driving over certain bumps at speed of 1.4 m s −1 , the average regenerated power of the designed EMA is 50.11 W with the system efficiency of 60%–70%. Highlights A novel rocker-pushrod electromagnetic active vehicle suspension is proposed. Performance-oriented controllers are designed, including comfort mode, sport mode and hybrid mode. The average regenerated power of the designed EMA is 50.11 W with the system efficiency of 60%–70% by test.

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

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  3. [해외논문]   Active interior noise control for rail vehicle using a variable step-size median-LMS algorithm   SCIE SCOPUS

    Guo, H. (Corresponding author at: School of Automotive Engineering, Shanghai University of Engineering Science, No. 333, Longteng Road, Songjiang District, Shanghai 201620, China.) , Wang, Y.S. , Liu, N.N. , Yu, R.P. , Chen, H. , Liu, X.T.
    Mechanical systems and signal processing v.109 ,pp. 15 - 26 , 2018 , 0888-3270 ,

    초록

    Abstract A variable step-size median least-mean-square (VS-MLMS) algorithm, for active noise control (ANC) of rail vehicle interior noises is presented in this paper. Firstly, the interior noises of an urban rail vehicle under normal operating conditions are measured and analysed. Results show that the interior noise includes obvious impact noise components, and the sound energy of this noise is mainly concentrated in a low-frequency range below 1000 Hz. Utilising the measured interior noises, the adaptive filter order, median window length, and the optimal step size of the MLMS algorithm are determined. According to the step-size scope, the VS-MLMS algorithm is developed using a Sine step-size adjusting function. The MLMS, VS-MLMS and other algorithms are applied to the measured interior noise signals. Results suggest that the proposed VS-MLMS, which can balance the convergence speed and the steady-state error well, is more suitable for active control of a low-frequency noise with impact noise components. The VS-MLMS algorithm can be directly used in an ANC system of the sample urban rail vehicle, which is helpful to improve the ride comfort of the passengers. Highlights A novel variable step-size median-LMS (VS-MLMS) algorithm is proposed. Parameters in VS-MLMS for active noise control of rail vehicle are determined. The VS-MLMS algorithm is compared with other 2 improved LMS algorithms. The VS-MLMS shows advantages for suppressing interior noise of a rail vehicle. The VS-MLMS can be used for ANC of other noises with impact components.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [해외논문]   Adaptive sliding mode control with moving surface: Experimental validation for electropneumatic system   SCIE SCOPUS

    Ayadi, Assil (Laboratory Lab-STA, LR11ES50, National School of Engineering of Sfax, University of Sfax, PB 1173, 3038 Sfax, Tunisia ) , Smaoui, Mohamed (Laboratoire Ampère, UMR CNRS 5005, INSA-Lyon, Université) , Aloui, Sinda (de Lyon, Lyon F-69621, Villeurbanne, France ) , Hajji, Soufien (Laboratory Lab-STA, LR11ES50, National School of Engineering of Sfax, University of Sfax, PB 1173, 3038 Sfax, Tunisia ) , Farza, Mondher (Laboratory Lab-STA, LR11ES50, National School of Engineering of Sfax, University of Sfax, PB 1173, 3038 Sfax, Tunisia )
    Mechanical systems and signal processing v.109 ,pp. 27 - 44 , 2018 , 0888-3270 ,

    초록

    Abstract In this work, an Adaptive Sliding Mode Control (ASMC) is proposed for a class of nonlinear MIMO system with external disturbances. Although the Sliding Mode Control (SMC) is known for its precision and robustness against disturbance and uncertainties, it suffers from a chattering phenomenon and the choice of sliding surface parameters. To solve such problems, the SMC discontinuous term was replaced by a proportional derivative term and a moving sliding surface was used. The adaptive parameters were obtained by Lyapunov stability analysis to guarantee the stability of the closed loop system. In order to illustrate the efficiency of the proposed controller, experimental results on electropneumatic system were presented and compared to a classic sliding mode controller. Highlights Adaptive sliding mode control using moving sliding surface is applied to an electropneumatic system. The proposed controller is designed to track the position and pressure of pneumatic actuator. Experimental results are presented to show the efficiency of Adaptive sliding mode control compared to sliding mode control.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [해외논문]   Prognosability study of ball screw degradation using systematic methodology   SCIE SCOPUS

    Li, Pin (NSF I/UCR Center for Intelligent Maintenance Systems, Department of Mechanical Engineering, University of Cincinnati, PO Box 210072, Cincinnati, OH 45221-0072, USA ) , Jia, Xiaodong (NSF I/UCR Center for Intelligent Maintenance Systems, Department of Mechanical Engineering, University of Cincinnati, PO Box 210072, Cincinnati, OH 45221-0072, USA ) , Feng, Jianshe (NSF I/UCR Center for Intelligent Maintenance Systems, Department of Mechanical Engineering, University of Cincinnati, PO Box 210072, Cincinnati, OH 45221-0072, USA ) , Davari, Hossein (NSF I/UCR Center for Intelligent Maintenance Systems, Department of Mechanical Engineering, University of Cincinnati, PO Box 210072, Cincinnati, OH 45221-0072, USA ) , Qiao, Guan (ShanXi Engineering Laboratory for Transmissions and Controls, Northwestern Polytechnical University, Xi'an, China ) , Hwang, Yihchyun (HIWIN Technologies Corp., No. 7, Jingke Rd., Taichung Precision Machinery Park, Taichung 40852, Taiwan ) , Lee, Jay (NSF I/UCR Center for Intelligent Maintenance Systems, Department of Mechanical Engineering, University of Cincinn)
    Mechanical systems and signal processing v.109 ,pp. 45 - 57 , 2018 , 0888-3270 ,

    초록

    Abstract As a critical mechanical component that converts rotary motion to linear motion with high precision, the ball screw has drawn a lot of attention in the field of Prognostics and Health Management (PHM). However, prognosis of the ball screw degradation has not been fully discussed yet in the current literature. This paper first justifies the prognosability of a ball screw via experimental studies, then proposes a systematic methodology for ball screw prognosis to implement the fault diagnosis, early diagnosis, health assessment and remaining useful life (RUL) prediction. Meanwhile, sensor-less and sensor-rich strategies are investigated and benchmarked in the experimental studies. The results demonstrate that the ball screw degradation behavior is available for prognosis and the proposed methodology can effectively help users to implement PHM analysis. Besides, the benchmark studies between sensor-less and sensor-rich strategies also achieve several practical conclusions that are valuable for real-world applications. Highlights Two experiments are designed to study the prognosability of ball screw. A systematic methodology for ball screw prognosis is proposed. Sensor-less and sensor-rich strategies are investigated and benchmarked. 98.9% accuracy for fault diagnosis and an observable degradation trend for prognosis.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  6. [해외논문]   Locating and imaging contact delamination based on chaotic detection of nonlinear Lamb waves   SCIE SCOPUS

    Liu, Xiaofeng (The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China ) , Bo, Lin (The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China ) , Yang, Kangjun (The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China ) , Liu, Yaolu (College of Aerospace Engineering, Chongqing University, Chongqing 400044, China ) , Zhao, Youxuan (College of Aerospace Engineering, Chongqing University, Chongqing 400044, China ) , Zhang, Jun (College of Aerospace Engineering, Chongqing University, Chongqing 400044, China ) , Hu, Ning (The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China ) , Deng, Mingxi (College of Aerospace Engineering, Chongqing University, Chongqing 400044, China)
    Mechanical systems and signal processing v.109 ,pp. 58 - 73 , 2018 , 0888-3270 ,

    초록

    Abstract We propose a novel method for locating and imaging contact delaminations in composite plates, using a network of PZT transducers and the nonlinear Lamb waves. Being immune to noise and sensitive to weak signal, the Duffing chaotic oscillator is utilized to detect the nonlinear harmonics of Lamb waves generated at the contact delamination interfaces. The Lyapunov exponent of the Duffing system output is calculated to quantify the relative intensity of nonlinear second harmonic. Its normalized value is taken as the damage index to locate and image the delaminations by combining with the probabilistic imaging algorithm. The numerical simulation study on the proposed method is performed. Compared with the nonlinearity parameter and the conventional damage index, the Lyapunov damage index (LDI) can image the single delamination or multiple delaminations more effectively, especially under the noise interference. The experiment using the LDI is also conducted on a composite laminated plate with multiple internal delaminations. The results show that the proposed imaging method based on LDI is also valid to the practical delaminations in the composite plate. It has the following advantages: immunity to noise, needlessness of baseline data, high imaging resolution and location accuracy. Highlights The nonlinearity parameter is invalid under the noise interference. The chaotic detection is sensitive to the nonlinear harmonic and robust to the noise. The Lyapunov exponent is taken as the damage index to locate the delamination. The higher quality of delamination image can be achieved with Lyapunov exponent.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  7. [해외논문]   Nonlinear model predictive controller design based on learning model for turbocharged gasoline engine of passenger vehicle   SCIE SCOPUS

    Hu, Yunfeng (State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130012, China ) , Chen, Huan (Department of Control Science and Engineering, Jilin University, Changchun 130025, China ) , Wang, Ping (State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130012, China ) , Chen, Hong (State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130012, China ) , Ren, Luquan (Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China)
    Mechanical systems and signal processing v.109 ,pp. 74 - 88 , 2018 , 0888-3270 ,

    초록

    Abstract In this paper, a neural-network-based nonlinear model predictive control (NMPC) scheme is investigated to realize coordinated control over the throttle and wastegate of a turbocharged gasoline engine of a passenger vehicle. First, due to the presence of MAPs and the complex structure of the turbocharged engine, establishing a mechanism model for controller design is very complicated. Benefiting from a large amount of experimental data, a predictive model is learned by a neural network to predict the future dynamics of the engine air-path system, and the accuracy of this model is verified. Second, to address the system constraints and coupling, a nonlinear model predictive controller is proposed to track the desired intake manifold pressure and boost pressure for meeting the engine torque demand. Third, quantum-behaved particle swarm optimization (QPSO) is applied for optimization of the NMPC objective function to obtain a more accurate solution. Finally, the performance of the control system is tested using the commercial simulation software AMESim. Highlights A predictive model is learned by neural network of turbocharged air-path system. A nonlinear model predictive controller is designed for air-path system. The QPSO is applied to solve the nonlinear constrained optimization problems.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  8. [해외논문]   Quantifying uncertainty in parameter estimates of ultrasonic inspection system using Bayesian computational framework   SCIE SCOPUS

    Ben Abdessalem, Anis (The French Alternative Energies and Atomic Energy Commission, CEA-LIST, Laboratory Methods for the Control, 91191 Gif-sur-Yvette, France ) , Jenson, Fré (The French Alternative Energies and Atomic Energy Commission, CEA-LIST, Laboratory Methods for the Control, 91191 Gif-sur-Yvette, France ) , dé (The French Alternative Energies and Atomic Energy Commission, CEA-LIST, Laboratory Methods for the Control, 91191 Gif-sur-Yvette, France) , ric , Calmon, Pierre
    Mechanical systems and signal processing v.109 ,pp. 89 - 110 , 2018 , 0888-3270 ,

    초록

    Abstract This paper will aim to characterise statistically the uncertain parameters in an ultrasonic (UT) inspection system from limited signal measurements and prior information in order to enhance the confidence on the probability of detection (POD) curve. The POD curve is widely used in industry to quantify the capability of a non-destructive testing technique to detect a defect with a given specifications. A realistic estimation of the POD requires to consider the uncertainty in the input parameters. However, in practice the uncertainties are seldom well quantified, which may cause problems for the POD estimation and its reliability to qualify robustly an inspection system. To address this issue, one proposes to characterise the uncertain parameters based on the information content in the UT signal. One of its distinctive features which can be used to solve the challenging inverse problem is the amplitude of the signal. A Bayesian approach seems a convenient framework for coping with limited number of measurements and prior information from experts’ judgement to keep POD cost as low as possible. An illustration which consists to control a tube with an embedded defect is provided to demonstrate the efficiency of the proposed methodology to quantify uncertainty in the input parameters. The nested sampling (NS) algorithm is used to make Bayesian inference for an efficient exploration of the posterior space. To reduce the computational requirements, the UT physical model is replaced by an emulator based on the least square support vector machines method. The obtained results show that by combining a limited number of measurements with priors may be a promising way to characterise statistically the uncertain parameters within reasonable computational time and acceptable accuracy. The study is carried out numerically by exploiting synthetic data generated from an UT physical model. Highlights A Bayesian inversion scheme using distinctive feature from UT signal is proposed. The efficiency of the method is investigated through different scenarios. GSA is performed to estimate the effect of each parameter on the UT signal amplitude. The choice of the probability distribution model on the POD curve is investigated.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

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  9. [해외논문]   Accurate modeling and analysis of a bio-inspired isolation system: with application to on-orbit capture   SCIE SCOPUS

    Dai, Honghua (College of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China ) , Jing, Xingjian (Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China ) , Sun, Chong (College of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China ) , Wang, Yu (Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China ) , Yue, Xiaokui (College of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China)
    Mechanical systems and signal processing v.109 ,pp. 111 - 133 , 2018 , 0888-3270 ,

    초록

    Abstract The accurate dynamical model of a bio-inspired isolation (BII) system with complete consideration of the kinetic and potential energies of all components is established for the first time. Owing to the inclusion of energies pertaining to the rods and joints in the modeling process, the equations of motion of the accurate BII model are virtually governed by a set of implicit ordinary differential equations (IODEs), which is totally different from the simplified model whose governing equations are standard ODEs. Since the accurate model cannot be transformed into the explicit form, viz. x ̇ = f ( x , t ) , it cannot be handled via the traditional numerical integration methods, e.g. the Runge-Kutta method. In order to conquer this difficulty, the harmonic balance method and the Matlab’s ODE15i code are employed to solve the periodic and aperiodic solutions, respectively. More importantly, the comparisons of dynamical responses as well as isolation performance between the accurate and simplified BII models are conducted in two situations. For the situation when system exhibits simple responses, the accurate and the simplified models generate qualitatively the same pattern of results. The only discrepancy is that the latter model produces an overestimated vibration. For the complex responses, an essential distinction occurs between the two models, indicating that using the accurate BII model is extremely important. Furthermore, the efficiency of the BII isolator is verified through comparing with the traditional spring-mass-damper (SMD) system. The influences of system parameters, such as damping, layer number, assembly angle, spring stiffness, etc., on the isolation performance have been investigated. Finally, numerical examples verify the efficiency of the present BII isolator in both ground and space environments. Highlights The accurate model of a bio-inspired isolation (BII) system is established. Using the simplified model provides an overestimated vibration value by about 5%. The accurate model is able to predict the long-lasting transient phase. The BII system shows a better performance in both ground and space environments.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  10. [해외논문]   Multi-dimensional signal processing and mode tracking approach for guided wave based damage localization in X-COR sandwich composite   SCIE SCOPUS

    Li, Guoyi (School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, USA ) , Chattopadhyay, Aditi (Mechanical and Aerospace Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, USA)
    Mechanical systems and signal processing v.109 ,pp. 134 - 149 , 2018 , 0888-3270 ,

    초록

    Abstract This paper presents a real-time signal processing and damage localization framework for ultrasonic guided wave based structural health monitoring of X-COR sandwich composites with a reference-free perspective. The high attenuation nature of X-COR composite significantly limits the ability to detect damage-induced reflected waveforms. Therefore, a novel multi-dimensional signal processing technique, coupled with a mode tracking approach for identifying trajectories and locating wave sources of all wave modes, including damage-induced converted modes, is proposed. The developed framework is experimentally validated using two internal damage scenarios: facesheet delamination and foam core separation. Results indicate that the framework offers not only high accuracy for locating internal damage positions, but also insights into guided wave propagation behaviors in highly complex composites such as the X-COR sandwich composite. Highlights Reference-free guided wave based damage localization of X-COR sandwich composite. A novel multi-dimensional signal processing technique has been developed. A mode tracking approach developed for localizing wave sources. Developed framework has been experimentally validated and shows high accuracy.

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