Structural Design and Simulation Analysis of Two-Dimensional Space Turntable

In order to respond to the national goal of “carbon neutralization” and make more rational and effective use of photovoltaic resources, combined with the actual photovoltaic substation project, a fixed adjustable photovoltaic support structure design is designed. By comparing the advantages and disadvantages of the existing support, an innovative optimization design is proposed, and the mechanical structure of the support is analyzed by ANASYS to check the rationality of the design. Saving construction materials and reducing construction costs provide a basis for the reasonable design of photovoltaic power station supports, and also provide a reference for the structural design of fixed and adjustable supports.

With the improvement of national living standard, electricity consumption has become an important part of national economic development. Under the influence of “carbon neutral” target in recent years, many power companies have combined the construction of substations with new energy solar energy to achieve low carbon emission reduction and bring profit for the company. In order to achieve the effective use of resources and the maximum conversion rate of photovoltaic energy, this project designs a fixed adjustable photovoltaic bracket structure which is easy to adjust and disassemble, and compares the advantages and disadvantages of existing photovoltaic brackets in actual use, proposes an innovative and optimized design, and uses finite element analysis software to carry out mechanical Structural analysis was conducted to verify the rationality of the design. Save construction materials, reduce construction cost, provide a basis for the reasonable design of PV power plant bracket, and also provide a reference for the structural design of fixed adjustable bracket in PV system.

Brushless doubly-fed generator (BDFG) has a good application prospect on the wind power generation field. In order to improve the power density, a new type of dual-stator brushless doubly-fed generator (BDFG) with magnetic-barrier rotor is presented in this paper. The overall structure design method and mechanical performance of DSBDFG is put forward and analyzed. In this paper, the stress analysis is carried out on the magnetic ring, the stationary shaft, end cover and chassis, and is determined its reasonable size and thickness, in order to achieve the purpose of stress analysis of this motor.

School buildings play a vital role in the development of a country's infrastructure, serving as key facilities for education and community growth. These structures must fulfill essential criteria, including structural safety, functionality, and cost-effectiveness. This study explores the structural analysis and design of a four-story primary school building located in Dhorenda, Savar Upazila, Dhaka. The site, encompassing 7.68 Katha, is approximately 12 meters southeast of the Dhaka-Aricha National Highway and 100 meters southeast of Nabinagor market. The primary goal of the project is to develop a multi-story school building that enhances student capacity and provides improved facilities. Various floor plan configurations are evaluated to ensure optimal performance under these forces. The study is organized into two main components: structural analysis and structural design. For structural analysis, the Load and Resistance Factor Design (LRFD) method is applied to determine the impact of various loads, including self-weight, live loads, and wind forces, on the building. Finite element software, ETABS, is utilized to simulate the structure’s behavior and validate its response to these loads. The structural design involves determining the dimensions and reinforcements of key components, such as beams, columns, slabs, and foundations, to ensure the stability and strength of the building. This research highlights the complexities involved in designing and constructing a robust educational facility and offers recommendations for improving the efficiency of similar projects in the future. The findings serve as a resource for professionals seeking to implement sustainable and resilient designs in school infrastructure development.

The pneumatic proportional pressure reducing valve is the main pressure control component in the fuel cell gas supply system, which directly affects the performance of the entire fuel cell system. Based on the research background of the hydrogen oxygen fuel cell gas supply system, a set of pneumatic proportional pressure reducing valves suitable for hydrogen oxygen gas environments was designed. Through structural design and multi-parameter analysis, the structural parameter design optimization and characteristic analysis of the proportional valve were proposed. It can provide high-precision and high stability gas control capabilities for fuel cell systems, and provide support for engineering applications.

In order to solve the problem that a traditional articulated arm coordinate measuring machine (AACMM) cannot measure automatically, a self-driven AACMM is proposed. Based on the self-driven AACMM design indicators, the length of the connecting rods of the self-driven AACMM was allocated. The self-driven AACMM virtual prototype was designed and assembled based on joint module selection and joint component design, and its measurement space range was also verified. The key components of the structural optimized design and dynamic performance analysis of motion parameters are adopted, respectively, to correct the positioning error of the self-driven AACMM’s probe caused by static and dynamic deformations. The static deformation of the structure caused by the self-driven AACMM’s weight was analyzed. The influence of the dynamic flexible deformation on the positioning error of the probe of the self-driven AACMM during the variable-speed approach and the constant-speed touch measurement stage was studied. The results show that the measurement space range of the self-driven AACMM designed in this paper can meet the design index of the measuring radius. The probe position error caused by static deformation of the measuring machine after structural optimization is reduced by an order of magnitude, and the equivalent stress of the mechanical structure of the self-driven AACMM is within the allowable stress of the material. The positioning error of the probe caused by the dynamic deformation of the self-driven AACMM structure meets the positioning accuracy index. During the stage of self-driven AACMM constant-speed touch measurement, the instantaneous position error of the probe changes linearly with the touch time and the optimal touch speed (6.6 mm s−1, 6.4 mm s−1) exists to minimize the probe positioning error. During the variable-speed approach stage, the influence of the angular acceleration and the angular velocity of each joint on the positioning error of the probe is negligible when the self-driven AACMM is in the typical posture. In the extreme posture, with the optimal joint angular acceleration ( 0.00055∘s−2 ) and angular velocity ( 0.0185∘s−1 ), the inertial force of the measuring machine structure and the instantaneous position error of the probe are the smallest, and the movement stability is the best. The structural optimization design and motion parameter performance analyses of the self-driven AACMM can provide a theoretical research foundation for subsequent motion parameter optimization and dynamic error compensation modeling.

In performing structural design or demonstrating the reliability of electronic devices, it is necessary to take various scatters into consideration which are induced in the load assessment, material characteristics, stress analyses and manufacturing. Therefore, a new method for probabilistic reliability design for electronics packages is proposed in this paper. In this method, firstly the probability distributions of the characteristic values such as stress values are calculated by combining stress analysis, response surface methodology and the Monte Carlo method. Consequently, the fracture probability can be derived by comparison of the probability distributions with the design criteria. Secondly, the probability on many assumptions can be updated using a new method based on Bayes theory for the purpose of estimating the reliability of the packages more accurately in combination with actual data or reliability tests. The new method was applied for the structural design of flip-chip BGA packages. The results of the application fro flip-chip BGA package design indicate that the new method is useful for the structural reliability design.

There are some asynchronous web-based courses available in the civil engineering technology field but to the author’s knowledge, very few courses exist in structural analysis and design. The advantages of web-based online learning include flexibility and the ability to accommodate various learning styles such as visual and auditory learners, with the visual learning style being the most common among people of college age and older. The Civil Engineering Technology program at RIT recently developed a suite of web-based courses as part of the new Certificate in Structural Design. The online courses available include Structural Analysis, Timber Design, Reinforced Concrete Design, Structural Steel Design, and Applied Mechanics. The web-based course management software used to create the e-learning environment is the Prometheus (or myCourses at RIT) platform developed at the University of Washington. This platform includes an integrated e-mail list, discussion boards, live chat rooms and an online grade book. The purpose of this paper is to present a simple and effective approach used by the author in teaching a structural analysis distance-learning course. Structural analysis is a very analytical course that involves a lot of problem solving, diagrams and figures; consequently, a combination of web-based and text-based delivery formats was used in this course. The course was divided into several modules with each module having its own Intended Learning Outcomes (ILO’s). The course modules serve as a benchmark and compass to guide and measure student learning throughout the quarter. After the completion of each module, the students were asked to provide quantitative feedback on the ILO’s for that module to the instructor, thus enabling the instructor to reinforce any concept that may not have been fully grasped by the students. Student-toinstructor interaction was maintained through the use of the discussion board in myCourses and by e-mail. The syllabus, course modules, homework assignments and other pertinent information were posted on the course web site. Weekly homework was assigned and the students submitted their homework to the instructor by fax. A proctor that was pre-approved by the RIT Office of Online Learning proctored all the tests and the final exam in this course in the student’s locality. In this paper, the author discusses the organization of the course, the course modules and ILO’s, student-to-student and student-to-instructor interactions, feedback and guidance, and students’ responses and lessons learned. Based on the student feedback and performance in this course, we conclude that the structural analysis course has been successfully delivered via a combination of web-based and text-based delivery formats.

Micromechanical gyroscope is one of the important applications of attitude control platform and inertial navigation system. However, domestic gyroscope research and development is not highly integrated at present, and the main research focuses on the design of micro-gyroscope with a single detection axis (especially z-axis detection). In order to realize the monolithic triaxial gyro which can be used in the field of intelligent ammunition, a wheel ring gyro structure is designed. The gyro structure was modeled on the SolidWorks software, and then modal analysis, transient impact response analysis and harmonic response analysis were carried out in the finite element analysis software ANSYS respectively. According to the natural frequency of each mode, the structure size of the gyroscope is optimized. Through the simulation results, it is observed that the frequency split between the working modes is relatively small, and the structure has high mechanical sensitivity. The transient impact simulation of the gyro structure shows that the maximum stress of the sensitive structure under the impact of 10000g@5ms is 394.34Mpa, which proves that the structure has good impact resistance.

In this paper, an instrument is designed for the detection of transmission error of medium and large-sized worm gear pair based on the FMT system, which has the advantages of large size and dynamic measurement. The working principle of the instrument is introduced, and the concept of integrated processing of the time-grid sensor and related parts of the instrument is proposed. The key components are designed using SolidWorks, and the structural layout and virtual assembly are completed; the finite element analysis of the beam assembly is carried out and the structure optimization is carried out through Ansys Workbench, and the 1st-order intrinsic frequency is increased by 24.71% after the optimization and the amplitudes corresponding to the intrinsic frequencies are significantly reduced in each order. After optimization, the 1st order intrinsic frequency is increased by 24.71%, and the amplitude corresponding to each order of intrinsic frequency is significantly reduced.

The structural analysis and design of the Heidrun tension leg platform presented many technical Challenge a that had to be overcome in a fast and efficient manner to meet the demands of a very tight schedule. Some are inherent in the nature of a compliant structure such as a TLP with its complicated interaction between the structure, the mooring system and the environment and the importance of proper weight and at ability control during the different phase a of construction and operation. However, many other a were unique to the Heidrun platform. The Heidrun hull is the first large offshore structure built entirely of high strength lightweight aggregate (LWA) concrete. The topside modules form an integral component of the structural system of the platform. The interface between the steel topside modules and the concrete hull proved to be a very complex engineering task requiring very detailed analyses, tight fabrication and installation tolerances as well as testing of a number of key components. Ringing loads were included in the structural design of the platform for the first time in an offshore structure. The transportation of the large topside modules, mounted transversely on barges, and their mating to the hull was unique. The reserve capacity built into the design to provide additional safety in the critical components of the structure. The paper presents an overview of the multitude of challenges encountered during the detail design of the platform. Introduction The Heidrun TLP introduced several structural innovations not seen previously on any offshore platform. Examples of these include the concrete Module Support Beams (MSBS) as a main structural member of the platform and for supporting the topside modules, unique solutions for connecting the topside modules to the substructure, exclusive use of high strength LWA concrete in the construction of the hull, design and fabrication of very large diameter columns, and design of the platform for the structural effects of ringing. This paper gives an overview of the structural analysis and design activities required in connection with the development of the Heidrun TLP and concentrates on design aspects which are novel or required more extensive consideration due to the nature of the TLP configuration or construction method. A short description of the platform is provided followed by the most significant aspects of thehydrodynamic and structural analyses. Special analyses and some of the unique design considerations associated with the hull and topsides design are presented. For completeness brief descriptions are given of the construction sequence of the hull, the foundations and the independent design verification performed for the structural design.

Research on multidisciplinary fatigue optimization design method in structural design of high speed train

A concrete gravity based structure (GBS) which supports production and drilling facilities, over 1 million barrels of oil storage, and has been designed to withstand iceberg and 100 year return period wave loads in the Grand Banks offshore Newfoundland. A comprehensive structural analysis and design has resulted in moderate reinforcement and post tensioning quantities. Simple construction techniques, where as much as 75% of the total concrete volume is based on the cost effective slip form technique, has been utilized. This paper describes the design premise, design basis, and analysis leading to the development of a cost effective concrete GBS for the Grand Banks. Introduction Prior to the drilling of the first exploration well at West Bonne Bay, Amoco Canada engaged in a Front End Loading (FEL) study to consider several possible options for development of the field. West Bonne Bay (WBB) field which is located in 95 to 100 m of water approximately 50 kilometers southeast of the Hibernia field. Several different drilling and production systems were considered including subsea, disconnectable floaters, and gravity based structures. Conceptual designs for both steel and concrete GBS were completed. A part of the FEL study a conceptual design of a concrete GBS was developed. This paper describes the conceptual design of a concrete GBS. Given their extensive CONDEEP experience in the NorthSea and the Hibernia GBS, Amoco engaged Aker Norwegian Contractors to perform the conceptual design. To provide further confidence in the design, two independent structural design audits were performed by the Offshore Division of Lloyd's Register1 and by Bernt Jakobson2. Considerations for the design of a concrete GBS included: iceberg and hydrodynamic force resistance, a narrow neck to reduce wave loads, structural components which maximize the advantages of concrete, oil tanks surrounded by ballast water, an outer ice wall, local constructability, towing, installation, and schedule. This paper briefly describes the conceptual design of the concrete GBS for West Bonne Bay. Interested readers should note that a detailed comparison of the WBB GBS described herein and the Hibernia GBS is given in another paper in this volume3. Design Premise and Basis The design premise for the WBB field development required a manned drilling, production, and quarters system for year round operations in the harsh environment of the Grand Banks. Amoco Canada estimated the need for 28 wells having a maximum production rate of 125,000 BOPD with produced gas reinjected into the reservoir. Minimum internal oil storage requirements were 750,000 bbl of 40°C oil while a generic operational topsides load of 35,000 tonnes was assumed for the conceptual design. An operating life of 25 years was assumed. A tow out topsides weight of 30,000 tonnes was assumed. The concrete structure was designed according to Norwegian Petroleum Directorate (NPD) Regulations for the Structural Design of Load Bearing Structures Intended for the Exploitation of Petroleum resources and Norwegian Standard NS 3473: Concrete Structures - Design Rules. As part of the conceptual design, a comparison was made of the Norwegian4 and CSA5 codes and were found to be largely compatible with slight differences in minimum reinforcement quantities. The environmental design basis for the GBS was adopted from the nearby Terra Nova field. The basic criteria are given in Table 1 while the pressure versus area curve for iceberg loading is given in Table 2. It is important to note that the Grand Banks location has some of the harshest environmental conditions in the world. An offshore

Structural performance of the Nigerian grown Abura timber bridge beam subjected to compression and shearing forces

Algorithms-Aided Design, a computational design methodology, has seen a seen an increased interest in the past decades. Especially for complex free-form geometries such as gridshells. The growing potential of controlling the design through algorithms allows for merging structural and architectural design methods by creating customised design tools according to the project requirements. In this paper, a plugin for Grasshopper based on the Finite Element Method is presented with a study case in which it was used and developed. We hope this plugin will help close the gap between the disciplines by quickly verifying boundary representation objects in real-time during conceptual design. A general discussion about gridshell connectors regarding their structural design and digital fabrication is provided.