scholarly journals Design and Equivalent Mechanical Modeling of New Deployable Cabin Segment

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Chuang Shi ◽  
Lingbin Zeng ◽  
Zijie Chen ◽  
Hongwei Guo ◽  
Yongyong Li ◽  
...  
Keyword(s):  
Structural Design ◽  
Continuous Model ◽  
Equivalent Model ◽  
Mechanical Modeling ◽  
Large Space ◽  
Static And Dynamic Characteristics ◽  
Equivalent Mechanical Model ◽  
Element Simulation ◽  
Comprehensive Performance ◽  
Depth Study

With the in-depth study of the construction of space bases, the demand for super-large deployable manned cabins in space is becoming increasingly urgent. In this study, a brand-new large space modular expandable cabin mechanism is proposed, and equivalent mechanical modeling research is conducted based on its modular characteristics. First, the overall configuration and the deployment driving scheme of the cabin section with the best comprehensive performance are optimized. In addition, a detailed structural design of the cabin section mechanism is carried out. Second, the mechanical equivalent continuous model of the cabin mechanism is established. The static and dynamic characteristics of the cabin mechanism are studied based on finite element simulation and equivalent model calculation, respectively. The correctness of the equivalent mechanical model established in this study is verified through comparative analysis. Finally, a scaled prototype is developed to verify the feasibility of the configuration and the new drive proposed in this study.

Model-Based Discrete Linear State Estimator for Nonlinearizable Systems With State-Dependent Noise

1990 ◽  
Vol 112 (4) ◽  
pp. 774-781 ◽  
Author(s):  
R. J. Chang
Keyword(s):  
Discrete Time ◽  
Continuous Model ◽  
Equivalent Model ◽  
State Estimator ◽  
Time Model ◽  
State Dependent ◽  
Present Technique ◽  
Linear State ◽  
Noisy Measurement ◽  
Time Linear

A practical technique to derive a discrete-time linear state estimator for estimating the states of a nonlinearizable stochastic system involving both state-dependent and external noises through a linear noisy measurement system is presented. The present technique for synthesizing a discrete-time linear state estimator is first to construct an equivalent reference linear model for the nonlinearizable system such that the equivalent model will provide the same stationary covariance response as that of the nonlinear system. From the linear continuous model, a discrete-time state estimator can be directly derived from the corresponding discrete-time model. The synthesizing technique and filtering performance are illustrated and simulated by selecting linear, linearizable, and nonlinearizable systems with state-dependent noise.

Numerical Analysis of Ship Wave Loads and Structure Strengthen Analysis on a Wind Power Installation Ship

2011 ◽  
Vol 90-93 ◽  
pp. 2521-2527
Author(s):  
Gang Qiang Li ◽  
Yan Yan Zhao ◽  
Yong He Xie
Keyword(s):  
Wind Power ◽  
Structural Design ◽  
Three Dimensional ◽  
Load Condition ◽  
Wave Loads ◽  
Element Simulation ◽  
Wind Power Installation ◽  
Wave Induced ◽  
Term Response

In a typical load condition of wind power equipment Installation ship, using the three-dimensional potential flow theory to prediction the long-term response of wave induced loads. then using the main load control parameters as a basis for the design wave selection, then application of DNV's SESTRA program make the wave-induced directly to the structure to finite element simulation. The results show that the hull structural design can meet the requirements.

Static Characteristics of Micro Disc Magneto Electric Generator – Simulation and Experiment

2013 ◽  
Vol 365-366 ◽  
pp. 356-359
Author(s):  
Lin Du ◽  
Geng Chen Shi ◽  
Jing Jing Zhao
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Experimental Result ◽  
Static Characteristics ◽  
Element Analysis ◽  
Electric Generator ◽  
Design And Optimization ◽  
Element Simulation ◽  
Simulation And Experiment ◽  
3D Software

Maxwell 3D software of finite-element analysis in electromagnetic fields is used to model and simulate the micro disc magneto electric generator. Distribution characteristics of magnetic induction are required and theoretical analysis and calculation is presented. Error between the simulation result and experimental result is about 6% which verify the rationality and accuracy of finite-element simulation. It can be used to guide the structural design and optimization of this type of generator.

scholarly journals A Theoretical Method for Structural Design and Analysis of Crankshafts

2015 ◽  
Vol 7 (3) ◽  
Author(s):  
Sergio Baragetti
Keyword(s):  
Finite Element ◽  
Theoretical Model ◽  
Structural Design ◽  
Finite Element Modelling ◽  
Theoretical Method ◽  
Simple Theoretical Model ◽  
Element Simulation ◽  
Strain Behaviour ◽  
Numerical Finite Element ◽  
Theoretical Procedure

The crankshaft is the crucial mechanical component in many machines and engines and its fatigue assessment is often very time consuming and expensive. The machine designer usually needs a simple theoretical model that would allow choosing the best material and the dimensions of the component in a quick and reliable way. The numerical finite element simulation of crankshafts should follow the first step of theoretical dimensioning with the aim of evaluating the stress-strain behaviour at the notched area to verify the component against fatigue failure. The development of an intermediate theoretical model would prove effective to reduce the time needed to reach a second approximation design of the crankshaft. The aim of this paper is to give the designer a theoretical procedure that allows determining the strain and stress state for verification of crankshafts. The model was developed in the case of crankshafts with two connecting rods and validated by means of numerical finite element modelling and analysis.

Bio-Inspired Fast Actuation by Mechanical Instability of Thermoresponding Hydrogel Structures

2016 ◽  
Vol 83 (7) ◽  
Author(s):  
Xuxu Yang ◽  
Guorui Li ◽  
Tingyu Cheng ◽  
Qian Zhao ◽  
Chunxin Ma ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Finite Element ◽  
Control System ◽  
Structural Design ◽  
Multilayered Structure ◽  
Mechanical Instability ◽  
Triggering Mechanism ◽  
Element Simulation ◽  
Ca Alginate ◽  
Poly Acrylamide

Inspired by natural plants, thermoresponding hydrogel (TRH) structures have been designed to trigger mechanical instability with fast actuation. Tough Ca-alginate/poly(N-isopropylacrylamide) (PNIPAM) hydrogel has been synthesized by the hybrid of physically cross-linked alginate and covalently cross-linked PNIPAM. The tough Ca-alginate/PNIPAM hydrogel exhibits 30 kPa of elastic modulus, 280 J/m2 of fracture energies, and fivefold of uniaxial stretch. A multilayered structure made of (Ca-alginate/PNIPAM)/(Ca-alginate/poly (acrylamide)) hydrogels demonstrate fast actuation induced by mechanical instability. A finite-element simulation model is developed to investigate the deformation and to guide the structural design of the hydrogels. The instability-triggering mechanism can enhance the actuation performances of hydrogel structures in applications, such as drug delivery, microfluid control system, and soft biomimetic robotics.

Electroplated Diamond Wire Saw Applying Ultrasonic Vibration to Cut Polysilicon Experiment and Simulation Analysis

2013 ◽  
Vol 395-396 ◽  
pp. 1044-1048
Author(s):  
Liao Yuan Zhang ◽  
Shuo Wang ◽  
Zhong Qing Shao ◽  
Zhong Xiu Lv
Keyword(s):  
Ultrasonic Vibration ◽  
Simulation Analysis ◽  
Ultrasonic Action ◽  
Diamond Wire ◽  
Element Simulation ◽  
Technology Process ◽  
Wire Saw ◽  
Diamond Wire Saw ◽  
Depth Study ◽  
Wire Cutting

In this paper, on the basis of a large number of literature at home and abroad are summarized, we used the complete with independent intellectual property rights ultrasound wire-cutting processing machine tool to carry out machining experiment , and the ultrasonic wire cutting mechanism and process was carried out in-depth study. The results showed: compared with ordinary sawing, the cutting efficiency of applying ultrasonic action was high, its cutting force and surface roughness was small, at the same time ,used the software of ABAQUS finite element simulation analysis, and further studied on the law of electroplated diamond wire saw ultrasonic vibration cutting of composite processing technology process.

scholarly journals Multi-layer composite mechanical modeling for the inhomogeneous biofilm mechanical behavior

2016 ◽  
Vol 14 (04) ◽  
pp. 1650014 ◽  
Author(s):  
Xiaoling Wang ◽  
Jingshi Han ◽  
Kui Li ◽  
Guoqing Wang ◽  
Mudong Hao
Keyword(s):  
Composite Model ◽  
Bacterial Biofilms ◽  
Alternative Theory ◽  
Experimental Measurements ◽  
Mechanical Modeling ◽  
Biofilm Thickness ◽  
Simulation Procedure ◽  
Element Simulation ◽  
Layer Composite ◽  
Multiple Component

Experiments showed that bacterial biofilms are heterogeneous, for example, the density, the diffusion coefficient, and mechanical properties of the biofilm are different along the biofilm thickness. In this paper, we establish a multi-layer composite model to describe the biofilm mechanical inhomogeneity based on unified multiple-component cellular automaton (UMCCA) model. By using our model, we develop finite element simulation procedure for biofilm tension experiment. The failure limit and biofilm extension displacement obtained from our model agree well with experimental measurements. This method provides an alternative theory to study the mechanical inhomogeneity in biological materials.

Discussion on Modern Coach Station Design

2013 ◽  
Vol 689 ◽  
pp. 211-215
Author(s):  
Hong Yan Li
Keyword(s):  
Traffic Flow ◽  
Structural Design ◽  
Three Dimensional ◽  
Architecture Design ◽  
Large Space ◽  
Planar Model ◽  
Architecture Modeling

China's transportation is developing rapidly, the design of the modern coach station has changed a lot compared with the traditional coach station. In response to these changes, architecture and structural design was discussed in this paper in order to guide the modern coach station design. In the field of architecture design, large space is often used; the traffic flow develops to three-dimensional mode on the base of planar model; commercial facilities are getting more attention, and architecture modeling design is novel; at the same time, structural design also changes accordingly

scholarly journals Modeling Problem of Equivalent Mechanical Models of a Sloshing Fluid

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Yu-Chun Li ◽  
Hong-Liang Gou
Keyword(s):  
Traditional Method ◽  
Equivalent Model ◽  
Flat Bottom ◽  
Modeling Methods ◽  
Equivalent Models ◽  
Modified Method ◽  
Equivalent Mechanical Model ◽  
Mechanical Models ◽  
Correct Location ◽  
Cylindrical Tanks

Because the defects in the existing modeling methods for the equivalent mechanical model of a sloshing fluid have led to incorrect or inaccurate results in the existing equivalent models, this paper discusses three different modeling methods for the equivalent models: the traditional method, Housner’s method, and the modified method. The equivalent models obtained by the three methods are, respectively, presented and compared with each other for a liquid in rectangular and upright cylindrical tanks. The results show that the traditional method cannot provide the correct location expressions of the equivalent masses because the two types of different excitations are simultaneously used in one equivalent model. An equivalent model is exclusively applicable to a certain excitation (a translational excitation in a certain direction or a rotational excitation about a certain axis). Housner’s method is based on physical intuition, instead of fluid dynamics theory, therefore the calculation precision of Housner’s solution is not satisfactory. Housner’s method is only suitable for vertical tanks with a flat bottom subjected to a horizontal excitation. Based on a conceptual mistake in the traditional method, the concept of the equivalent model is reclarified, and the modified equivalence method is therefore suggested. A supplementary solution for the equivalent model in a cylindrical tank is presented. The correct models can be acquired using the modified equivalence method, which is applicable to tanks of arbitrary shape.

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