Optimization design of radar antenna array structure and study on its mechanical performance based on ANSYS

Based on the principle of axial active magnetic bearing system with single degree of freedom, the difference between magnetic system vibration mode and the traditional bearing system vibration mode were described. Initial four order natural frequencies and vibration mode were calculated by the module of modal analysis of ANSYS11. Axial displacement and control current influence on natural frequencies and vibration mode were also analyzed. At last they were compared with the results of experimental modal analysis. Analysis shows that there was a certain difference between the results of finite element method and experimental model analysis, but the difference was small. It provided theoretical basis for flexible system design and dynamic design.

Through the dynamic and static analysis of SMF6020 precision grinder bed, the maximum deformation is obtained in the machining process of the bed, and the natural frequency and vibration mode. It provides a theoretical basis for improving the design of the whole structure of precision grinding machine.

Purpose This research presents a design method for designing greenhouse structures based on topology optimization. Moreover, the structural design of a gothic greenhouse is proposed in which its structural strength has been improved by using this proposed method. In this method, the design of the structure is done mathematically; therefore, in the design process, more attention can be focused on the constraint space and boundary conditions. It was also shown how the static reliability and fatigue coefficients will change as a result of the design of the greenhouse structure with this method. Another purpose of this study is to find the weakest part of the greenhouse structure against lateral winds and other general loads on the greenhouse structure. Design/methodology/approach In the proposed method, the outer surface and the allowable volume as a constraint domain were considered. The desired loads can be located on the constraint domain. The topology optimization was used to minimize the mass and structural compliance as the objective function. The obtained volume was modified for simplifying the construction. The changes in the shape of the greenhouse structure were investigated by choosing three different penalty numbers for the topology optimization algorithm. The final design of the proposed structure was performed based on the total simultaneous critical loads on the structure. The results of the proposed method were compared in the order of different volume fractions. This showed that the volume fraction approach can significantly reduce the weight of the structure while maintaining its strength and stability. Findings Topology optimization results showed different strut and chords composition because of the changes in maximum mass limit and volume fraction. The results showed that the fatigue was more hazardous, and it decreased the strength of structure nearly three times more than a static analysis. Further, it was noticed that how the penalty numbers can affect topology optimization results. An optimal design based on topology optimization results was presented to improve the proposed greenhouse design against destruction and demolition. Furthermore, this study shows the most sensitive part of the greenhouse against the standard loads of wind, snow, and crop. Originality/value The obtained designs were compared with a conventional arch greenhouse, and then the structural performances were shown based on standard loads. The results showed that in designing the proposed structure, the optimized changes increased the structure strength against the standard loads compared to a simple arch greenhouse. Moreover, the stress safety factor and fatigue safety factor because of different designs of this structure were also compared with each other.

Based on some space camera structure as the research subject, the statics analysis and modal analysis were studied using HyperMesh software. With the first order natural frequency being as constraint object, the topology optimization design of the original structure was made using OptiStruct software, which made the static deformation decrease by 42.4%; the fundamental frequency increase by 12.1%, effectively resolving the problem of the vibration of the circuit board components. Some further studies are necessary for the structure design of space camera.

In this study, a 3D model of a two‐step sine movable tooth drive is developed in the UG software. The finite element model (FEM) analysis package, ANSYS, is used to calculate the natural frequencies and vibration modes of the drive system. The results show that the first twenty natural frequencies can be classified into five families, including the total system vibration mode, single‐element vibration mode, two‐element vibration mode, three‐element vibration mode, and four‐element vibration mode. The effects of the system parameters on the natural frequencies and the vibration modes are investigated. The track amplitude, the movable tooth radius, the radius of the movable tooth rotation, and the number of movable teeth affect the natural frequencies and vibration modes of the drive system.

With constant development of machine tools toward the direction of high speed, high precision, high efficiency and high compound rapidly. The performance of high-speed machine tools is affected by the dynamic characteristic of machine tools in the very great degree. More and more attention is played to them and higher and higher demands are proposed. Finite element method is a kind of fast and efficient auxiliary tools in modern engineering analysis and design. Three-dimensional finite element model of spindle box is established in this paper based on large finite element analysis software ANSYS. Through modal analysis, the first five order natural frequency, vibration mode and various order vibrating modal characteristics are obtained. These results are verified by using the method of experimental modal. Harmonic response analysis is carried after doing modal analysis on spindle box. Response and stress under different frequency are obtained. Continuous dynamic characteristics are forecasted.

According to the actual needs of rehabilitation training after knee joint replacement surgery, and based on ergonomics, the idea of personification design and the basic design idea of force transfer between human body and exoskeleton are discussed, objective to develop a rehabilitation exoskeleton robot for leg rehabilitation after knee joint replacement surgery. The robot can detect the movement trend of the human body, judge the motion intention in use, and promote the movement of the hind leg, so as to achieve the purpose of rehabilitation training of the knee joint. The modal analysis of the lower limb rehabilitation exoskeleton robot is carried out, and the first six order natural frequencies and vibration modes are obtained.

In this paper, based on Ansys the deformation and stress for high pressure long cylindrical natural gas storage tank are analysed. And obtain the stress distribution of the storage tank. The changes of stress are analysed in thickness direction and along the rigid wall. The results and theoretical results are accordance. On this basis, the modal analysis of tank is completed too. Obtained the tank various order natural frequency and vibration mode. The calculation results show that the method is effective and provide the theoretical basis for high pressure tank design

A novel compliant mechanism with three degree of freedom (DOF) is proposed, based on the method of Freedom and Constraint Topology (FACT). One movement and two rotations are obtained in Case 3, Type 2 freedom space. A redundant constraint is added to improve the symmetry. The finite element modal (FEM) is established and static force analysis is conducted. Results demonstrate that the compliant mechanism is decoupled. Modal analysis is carried out with the finite element method. And four orders natural frequency and main vibration mode are obtained.

Aims: This study aims to conduct a comprehensive static analysis and lightweight multi-objective optimization of the spiral sorting device (auger) used in coal mine roadway concrete pavers. The primary objective is to fundamentally enhance the economic efficiency, structural reliability, and operational stability of the equipment under the harsh, confined, and demanding underground environments typical of modern coal extraction facilities. Study Design: A rigorous numerical computational design combining advanced Finite Element Analysis (FEA) and statistical Response Surface Methodology (RSM) was deployed to systematically evaluate and optimize the mechanical structure. Methodology: Initially, a rigorous mesh independence verification was discussed to ensure the absolute accuracy and computational efficiency of the numerical solutions. Subsequently, a detailed static analysis was performed by fixing both ends of the spiral shaft to simulate bearing constraints, applying a substantial surface load of 15000 N on the active faces of the spiral blades to simulate concrete resistance, and subjecting the spiral shaft to a driving torque of 573 N·m. Building upon the baseline static analysis results, a central composite design (CCD) was employed to construct a accurate mathematical response surface model. The spiral shaft diameter and blade thickness were selected as independent design variables, while the total structural mass, maximum total deformation, and maximum equivalent stress were established as the targeted objective functions. Finally, a Multi-Objective Genetic Algorithm (MOGA) was utilized to navigate the complex design space for global optimal searching based on Pareto efficiency. Results: The initial comprehensive static analysis indicated that the maximum equivalent stress of the spiral sorting device was intrinsically located at the root of the blade, peaking at 126.46 MPa. Concurrently, the maximum deformation was recorded at 1.2891 mm at the outermost blade tip. Both baseline values fully met the rigorous safety design requirements. Detailed sensitivity analysis subsequently revealed that the spiral shaft diameter possessed the most significant dominant impact on both total mass and structural deformation, whereas the blade thickness exerted a more pronounced, localized influence on the stress distribution at the blade roots. Through extensive MOGA optimization iterations, the optimal geometric parameters were mathematically determined and engineering-rounded to a shaft diameter of 44 mm and a blade thickness of 4 mm. Consequently, the mass of the newly optimized device was remarkably reduced from an initial 28.411 kg down to 23.056 kg. Simultaneously, the maximum stress increased to 196.56 MPa and the maximum deformation shifted to 2.4121 mm, both of which dynamically remain strictly and safely within the allowable physical limits of the selected material. Conclusion: The optimized design strategy successfully and significantly reduced the unnecessary dead mass of the spiral sorting device, achieving the coveted lightweight construction without compromising the essential structural strength and operational stiffness. This in-depth research provides a solid theoretical foundation, robust numerical validation, and a practical engineering reference for the future development, upgrading, and manufacturing of intelligent paving equipment operating under severely constrained underground conditions.

Using finite element software ADINA, three coupling models on fluid-structure interaction among internal fluid—pipe—external fluid in the lifting pipeline were researched. Firstly, coupling finite element model on fluid structure interaction of lifting pipeline was established and the first sixth order natural frequencies and principal vibration modes were attained at different ore conveying volume concentration and cross-section size of pipeline;Then natural frequencies of three couplings were compared with two couplings and no coupling according to the above condition, and FSI effect on natural frequency of pipeline was discussed. The calculation results were shown that the natural frequency of the pipe and its relative error reduced with the volume concentration and the relative wall thickness increased, which explain the reason that has better accuracy considering three couplings than other .These results have certain directive significance on the dynamic response, structure design and study of reduction vibration of lifting pipeline.

The system of shear wall as an additive in retrofitting of soft storey structure has been investigated in previous and present research to improve the strength of structures due to seismic load. The aim of this research is to conduct comparative study on Equivalent Static Analysis (ESA), Response Spectrum Analysis (RSA) and Time History Analysis (THA) of structure between reference sample and shear wall systems was performed in order to determine the strength and stiffness of soft storey structure. The locations and shapes of shear wall system were used as retrofitting method. The retrofitting of soft storey structure was done for fives (5) models consist of one (1) model without shear wall as reference sample and the other four (4) models of different location and shape of shear wall systems. The models were tested by using SAP200 computer software to performed strength of structure. The models had been checking by value of lateral displacement and base shear resistance. Based on the collected data, the additional of shear wall was found to increase the strength and stiffness of soft storey structure. The swastika shape of shear wall and provide at centre experienced the maximum base shear resistance in all X, Y and Z direction and the least displacement compared to other model. Through this study had shown the improvement of strength of soft storey structure by applying shear wall system as an additive strength and stiffness of structure due earthquake event.

There is a difficult technology problem of high-pressure differential multi-layer separate injection, which had given birth to after using the technology of water injection in the process of oil extraction, the electrical control type water distributor has been designed for the solving of this difficult technology problem. The dynamic characteristics for the executive body of electrical control water type distributor had been studied based on the technology of virtual prototyping and the theories of multi-rigid-body kinematics and modal analysis. The three-dimensional model and dynamics model had been established firstly using UG software, then the kinematics analysis and modal analysis of its key components had been simulated using ADAMS software, its kinematics discipline and natural frequencies and vibration modes have been simulated at last. Therefore, the simulation results provide theory data for its structural optimization design.

Based on the principle of static and modal analysis, carry on the static and dynamic characteristics analysis to the spindle of CK61125 machine tool using the finite element method (FEM). Then, got the static stress and deformation cloud, solve the first six order natural frequency and mode shape of the structure, provides a reference of engineering design and application for the machine tool spindle.

Free Vibration Modes Analysis of Femur Bone Fracture Using Varying Boundary Conditions based on FEA