Zuowei Wang

Xidian University · School of Mechano-Electronic Engineering

Internal parameters of non-smooth systems, such as hysteresis and gap systems, are unable to be measured when the system is enclosed. For a non-smooth gap system, the actual system state is difficult to be evaluated due to state transitions and the coupled internal mechanical and geometric parameters. Moreover, the system state evaluation directly...

Modular space structure has become a research hotspot in the aerospace field. In the microgravity and weak damping space environment, modular space structures may continuously vibrate due to the transient excitation caused by satellite attitude adjustment or space debris impact, which will make the structure unstable. Therefore, a passive vibration...

Purpose The inchworm actuator is widely applied in space industry. One of the major issues in space instrumentation is the reliability, especially under space thermal load. The purpose of this paper is to present a numerical calculation method for the inchworm actuator reliability with considering the effect of space temperature. Design/methodolog...

State jump has been experimentally observed in space deployable structures working in alternating temperature environments. State jump is a phenomenon in which the geometric shape of the structure changes after the temperature loading and unloading process, which makes the working accuracy of the space deployable structure intrinsically unpredictab...

Due to kinematic function requirements, deployable structures inevitably have many clearance joints. The existence of clearance joints not only reduces the structural stiffness but also leads to complex nonlinear dynamic characteristics. This paper proposed a general numerical method based on the wave motion theory, which is able to analyze these c...

In this paper, single material beams as the basic structural members in the traditional periodic frame structure were extended to the ones of multi-material composite beam with locally resonant (LR) unit. Based on the spectral element method and the topological characteristics of structure, an assembly method of the stiffness matrix for virtual ful...

This paper proposes a semi-analytical method for flexural wave scattering by cylindrical annular inclusions of varying thickness on an infinite thin plate. The thickness of inclusions is assumed to vary in arbitrary power form along the radial direction. In the numerical method, analytically linear relationships between expansion coefficients of ex...

During assembly of a cable-net reflector, surface adjustments must be made to meet the stick accuracy requirement of a space mission by changing the lengths of adjustable cables. It is desirable to find the optimum adjustment amount based on the current state of the cable-net reflector. However, all data needed to establish an accurate simulation m...

The main purpose of this paper is to present a pretension design method for space deployable mesh reflectors under multi-uncertainty. There exist multi-source errors in space deployable structures, such as dimensional error, imperfect material properties, and thermal error in space environment. The error which results in the structural uncertaintie...

The main purpose of this paper is to design the geodesic cable net for space deployable mesh reflectors by means of the geodesic differential equation, which is different from the traditional quasi-geodesic cable net. In order to generate the geodesic cable net, two main problems must be addressed. One is to generate the geodesics on the paraboloid...

In this paper, the linear dynamic analysis and active control of prestressed taut cable net structures are investigated by the wave scattering method. Wave motion equations of cables are firstly derived to obtain the wave dispersion characteristics, which are the combinations of the longitudinal tensile wave equations of bars and transverse wave eq...

Large deployable high-frequency mesh antennas are being envisioned for future space missions. The static determinacy is required to ensure the long-term dimensional stability of cable net reflectors of mesh antennas under extreme space environments. In this paper, the design methodologies for creating statically determinate cable net topology confi...

A pretension design method based on the projection principle is proposed for space deployable mesh reflector antennas. First, the equilibrium tension of the plane cable net structure is obtained by a force equilibrium method. Then, the obtained cable tensions of the plane cable net structure are projected to the spatial cable net reflector to obtai...

The knitted wire mesh is often used as a reflecting surface of large deployable antennas. Because different wire meshes have different electrical properties, it is very important and necessary to research the analysis method of mechanical properties of wire meshes. The mechanical analysis of the wire mesh is very difficult because of the complex st...

Cable-beam structures characterized by variable stiffness nonlinearities are widely found in various structural engineering applications, for example in space deployable structures. Space deployable structures in orbit experience both high temperature caused by sun's radiation and low temperature by Earth's umbral shadow. The space temperature diff...

The objective of this study is to analytically investigate the nonlinear response and nonlinear power distribution of parametrically excited space cable-beam structures under the effects of simultaneous internal and external resonances. The general coupled thermo-elastic equations of cable-beam structures considering geometrically nonlinearity of c...

This paper performs an analysis to the systematic surface figure error influenced by three factors including errors of faceted paraboloids, fabrication imperfection and random thermal strains in orbit. Firstly, the computational formulas for root-mean-square surface deviations caused by these factors are presented respectively. The stochastic finit...

The nonlinear dynamic analysis of cable net structures becomes more and more significant for their space applications required high surface accuracy, especially mesh reflector antennas. In this work, the resonant multi-modal dynamics due to 1:1 internal resonances in the finite-amplitude vibrations of cable net structures subjected to harmonic load...

Active vibration control of cable net structures is becoming significant when large-size cable net structures are widely applied in various engineering fields, especially in satellite antennas. The placement of actuators and sensors will have a major influence on the control efficiency. This paper develops an H-2-norm strategy for the optimal place...

High-precision cable net reflectors are widely required for future communications and observations. Concerning the improvement of their surface accuracy, the active cable structure constructed by incorporating a piezoelectric (PZT) actuator into flexible cables has been proposed to achieve active shape control or active correction of the reflector...

Deployable high-frequency mesh reflector antennas for future communications and observations are required to obtain high gain and high directivity. In order to support these new missions, reflectors with high surface accuracy are widely required. The form-finding analysis of deployable mesh reflector antennas becomes more vital which aims to determ...

Active shape adjustment of cable net structures is becoming significant when large-size cable net structures are widely applied in various fields, especially in satellite antennas. The main objective of this paper is three-fold. First, the finite element model of cable net structure with active cables is established. The active cable is constructed...

Distributed control is a promising method for large-scale interconnected systems that are composed of several subsystems. This paper considers the design of distributed active vibration control for tensegrity structures. Based on the distributed control theory, the simplified subsystem model of the tandem interconnected system is proposed. A contro...

Deployable mesh reflectors for future communication and observation applications are required to have high gain and high directivity. In order to support these new missions, high surface accuracy reflectors are necessitated. The form-finding analysis for deployable mesh reflectors becomes more vital. It is to determine the equilibrium tension-force...

This paper describes a prototype and analytical studies of a spherical rolling robot, a new design of a nonholonomic robot system. The spherical robot is driven together by an internal linearmotor, continuously changing the center of gravity, and external wind thrust. A mathematical model of the robot's motion was developed using Maggi's equations...