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A dynamic model of mobile concrete pump boom based on discrete time transfer matrix method

Wu REN, Yunxin WU, Zhaowei ZHANG

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4,   Pages 360-366 doi: 10.1007/s11465-013-0280-8

Abstract: A dynamics model of a mobile concrete pump boom is established based on discrete time transfer matrixmethod (DTTMM).The overall dynamic equation and transfer matrix of the model can be assembled by sub-structures A andThe displacement and rotation angle curves of the proposed method fit well with the ADAMS model.Besides it is convenient in modeling and saves time.

Keywords： multi-body     mobile concrete pump boom     discrete time transfer matrix method (DTTMM)     kinematic     dynamic     tip    

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A model reference adaptive control based method for actuator delay estimation in real-time testing

Cheng CHEN, James M. RICLES

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 3,   Pages 277-286 doi: 10.1007/s11709-010-0072-8

Abstract: Real-time testing provides a viable experimental technique to evaluate the performance of structuralHowever, these adaptive methods all require time duration for actuator delay adaptation.This paper presents a model reference adaptive control based method to identify the parameter of a simplifieddiscrete model for servo-hydraulic dynamics and the resulting compensation method.numerical analysis and experimental results to evaluate the effectiveness of the proposed estimation method

Keywords： real-time testing     actuator delay     compensation     adaptive control     MIT rule     discrete transfer function    

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Gained switching-based fuzzy sliding mode control for a discrete-time underactuated robotic system with

Hui LI, Ruiqin LI, Jianwei ZHANG

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 2,   Pages 353-362 doi: 10.1007/s11465-020-0620-4

Abstract: This study proposes a gained switching-based discrete-time sliding mode control method to address thechattering issue in disturbed discrete-time systems, which suffer from various unknown uncertaintiesThrough the new structure of the designed reaching law, the proposed method can effectively increaseperformance and robustness of the proposed reaching law in the studied system and prove the proposed method

Keywords： sliding-mode control     robot control     discrete-time uncertain systems     fuzzy logic    

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Application of coupled multi-body dynamics–discrete element method for optimization of particle damper

Danhui DAN, Qianqing WANG, Jiongxin GONG

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 244-252 doi: 10.1007/s11709-021-0696-x

Abstract: In this paper, a coupled multi-body dynamics–discrete element method is proposed to simulate the dampingThe analyses are done by combining the discrete element method in EDEM and multi-body dynamics in ADAMS

Keywords： granular material     vibration control     discrete element method     particle damper     cable vibration    

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Improving existing “reaching law” for better discrete control of seismically-excited building structures

Zhijun LI, Zichen DENG

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 111-116 doi: 10.1007/s11709-009-0022-5

Abstract: In this paper, a novel “composite reaching law” was explained in details: 1) the equation of discretemotion for a control system; 2) the design of discrete-time variable structure control.the model of a three-storey shear-type building structure was used to verify the effectiveness of the discretevariable structure control method.

Keywords： discrete-time variable structure control     composite reaching law     chattering effect     saturated control law    

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3D mode discrete element method with the elastoplastic model

Wei HU, Feng JIN, Chong ZHANG, Jinting WANG

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 1,   Pages 57-68 doi: 10.1007/s11709-012-0139-9

Abstract: The three-dimensional mode-deformable discrete element method (3MDEM) is an extended distinct element

Keywords： mode discrete element method     elastoplastic     numerical method     discontinuum     contact    

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A “Sequential Design of Simulations” approach for exploiting and calibrating discrete element simulations

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6,   Pages 874-885 doi: 10.1007/s11705-021-2131-1

Abstract: The flow behaviours of cohesive particles in the ring shear test were simulated and examined using discreteelement method guided by a design of experiments methodology.

Keywords： discrete element method     cohesive materials     parameter calibration     ring shear cell     design of experiments    

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Subspace-based identification of discrete time-delay system Article

Qiang LIU,Jia-chen MA

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 6,   Pages 566-575 doi: 10.1631/FITEE.1500358

Abstract: We investigate the identification problems of a class of linear stochastic time-delay systems with unknownA time-delay system is expressed as a delay differential equation with a single delay in the state vectorWe first derive an equivalent linear time-invariant (LTI) system for the time-delay system using a stateThen a conventional subspace identification method is used to estimate augmented system matrices andNumerical examples are to show the effectiveness of the proposed method.

Keywords： Identification problems     Time-delay systems     Subspace identification method     Alternate convex search    

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numerical framework for underground structures in layered ground under inclined P-SV waves using stiffness matrix

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 10-24 doi: 10.1007/s11709-022-0904-3

Abstract: The free-field responses are first obtained using the stiffness matrix method based on plane-wave assumptionsThen, the domain reduction method was employed to reproduce the wavefield in the numerical model of the

Keywords： underground structures     seismic response     stiffness matrix method     domain reduction method     P-SV waves    

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New Cuk Matrix Converter with High Voltage Transfer Ratio

Zhang Xiaoping,Zhu Jianlin,Tang Huaping,Zhang Binggen,Liu Shasha

Strategic Study of CAE 2008, Volume 10, Issue 4,   Pages 78-83

Abstract:

The drawback of classical matrix converter having low voltage transferratio is studied and a topology of a new matrix converter called as a Cuk matrix converter is proposedfundamental are firstly introduced, the analytic expression concerning functions relation of voltage transferratio to duty cycle is deduced, and the basic design method of double-loop control strategy is expoundedThus the inherent problem of classical matrix converter having low voltage transfer ratio is effectively

Keywords： Cuk matrix converter     circuit topology     voltage transfer ratio     double-loop control     simulation    

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Buffer capacity of granular matter to impact of spherical projectile based on discrete element method

Ying YAN, Pengfei LI, Shunying JI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 1,   Pages 50-54 doi: 10.1007/s11709-013-0186-x

Abstract: To investigate the impact-absorbing capacity of granular matter, the discrete element method (DEM) is

Keywords： granular matter     impact peak     buffer capacity     discrete element method     critical thickness    

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Discrete element method modeling of corn-shaped particle flow in rectangular hopper

He TAO, Baosheng JIN, Wenqi ZHONG, Xiaofang WANG,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 2,   Pages 267-275 doi: 10.1007/s11709-010-0035-0

Abstract: Discrete element method (DEM) was developed to simulate the corn-shaped particles flow in the hopper.

Keywords： discrete        element          method        (DEM)             non-spherical    

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Launch dynamics of multibody system and its applications

Rui Xiaoting

Strategic Study of CAE 2011, Volume 13, Issue 10,   Pages 76-82

Abstract:

Bad firing precision, huge consumption of projectiles in test and launch unsafety are the three difficult technology problems constraining the development of modern rockets and gun weapons. Firing precision and the launch safety of weapon system depend on dynamics style of weapon system. As a engineering subject of multidisciplinary approach studying the motion styles of weapon system and the force acting on it during launch process, launch dynamics has been a new technological breakthrough in improving firing precision and launch safety of rockets and gun weapon system in the world, provided new theory and technology for design and test of firing precision and launch safety. In this paper, theory and technology of launch dynamics of multibody system and its applications in design and test of firing precision and safety for rockets and gun weapons are studied.

Keywords： firing precision     consumption of projectile in test     launch safety     launch dynamics of multibody system     transfermatrix method of multibody system    

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Model test and discrete element method simulation of shield tunneling face stability in transparent clay

Huayang LEI, Yajie ZHANG, Yao HU, Yingnan LIU

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 147-166 doi: 10.1007/s11709-020-0704-6

Abstract: The stability of the shield tunneling face is an extremely important factor affecting the safety of tunnel construction. In this study, a transparent clay with properties similar to those of Tianjin clay is prepared and a new transparent clay model test apparatus is developed to overcome the “black box” problem in the traditional model test. The stability of the shield tunneling face (failure mode, influence range, support force, and surface settlement) is investigated in transparent clay under active failure. A series of transparent clay model tests is performed to investigate the active failure mode, influence range, and support force of the shield tunneling face under different burial depth conditions, whereas particle flow code three-dimensional numerical simulations are conducted to verify the failure mode of the shield tunneling face and surface settlement along the transverse section under different burial depth conditions. The results show that the engineering characteristics of transparent clay are similar to those of soft clay in Binhai, Tianjin and satisfy visibility requirements. Two types of failure modes are obtained: the overall failure mode (cover/diameter: / ≤1.0) and local failure mode ( / ≥2.0). The influence range of the transverse section is wider than that of the longitudinal section when / ≥2.0. Additionally, the normalized thresholds of the relative displacement and support force ratio are 3%–6% and 0.2–0.4, respectively. Owing to the cushioning effect of the clay layer, the surface settlement is significantly reduced as the tunnel burial depth increases.

Keywords： shield tunneling face     stability     transparent clay     model test     numerical simulation    

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High-efficiency inspecting method for mobile robots based on task planning for heat transfer tubes in

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 2, doi: 10.1007/s11465-022-0741-z

Abstract: Many heat transfer tubes are distributed on the tube plates of a steam generator that requires periodicpaper introduces the structure and control system of a dexterous robot and proposes a task planning methodThis method proceeds into three steps: task allocation, base position search, and sequence planning.To allocate the task regions, this method calculates the tool work matrix and proposes a criterion toThe results show that the proposed method can accomplish full task coverage with few repetitive or redundant

Keywords： steam generator transfer tubes     mobile robot     dexterous structure     task planning     efficient inspection    

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Title Author Date Type Operation

A dynamic model of mobile concrete pump boom based on discrete time transfer matrix method

Wu REN, Yunxin WU, Zhaowei ZHANG

Journal Article

A model reference adaptive control based method for actuator delay estimation in real-time testing

Cheng CHEN, James M. RICLES

Journal Article

Gained switching-based fuzzy sliding mode control for a discrete-time underactuated robotic system with

Hui LI, Ruiqin LI, Jianwei ZHANG

Journal Article

Application of coupled multi-body dynamics–discrete element method for optimization of particle damper

Danhui DAN, Qianqing WANG, Jiongxin GONG

Journal Article

Improving existing “reaching law” for better discrete control of seismically-excited building structures

Zhijun LI, Zichen DENG

Journal Article

3D mode discrete element method with the elastoplastic model

Wei HU, Feng JIN, Chong ZHANG, Jinting WANG

Journal Article

A “Sequential Design of Simulations” approach for exploiting and calibrating discrete element simulations

Journal Article

Subspace-based identification of discrete time-delay system

Qiang LIU,Jia-chen MA

Journal Article

numerical framework for underground structures in layered ground under inclined P-SV waves using stiffness matrix

Journal Article

New Cuk Matrix Converter with High Voltage Transfer Ratio

Zhang Xiaoping,Zhu Jianlin,Tang Huaping,Zhang Binggen,Liu Shasha

Journal Article

Buffer capacity of granular matter to impact of spherical projectile based on discrete element method

Ying YAN, Pengfei LI, Shunying JI

Journal Article

Discrete element method modeling of corn-shaped particle flow in rectangular hopper

He TAO, Baosheng JIN, Wenqi ZHONG, Xiaofang WANG,

Journal Article

Launch dynamics of multibody system and its applications

Rui Xiaoting

Journal Article

Model test and discrete element method simulation of shield tunneling face stability in transparent clay

Huayang LEI, Yajie ZHANG, Yao HU, Yingnan LIU

Journal Article

High-efficiency inspecting method for mobile robots based on task planning for heat transfer tubes in

Journal Article