Design Verification Method Research Articles

Model-Based Digital Overall Integrated Design Method of AUVs

Autonomous underwater vehicles (AUVs) have the characteristics of a high performance, a complex coupling mechanism, a compact, complex system composition, as well as high requirements for design constraints, quality, and reliability. In the traditional overall design process, numerous design tools and software programs are used, which results in poor model data sharing, a lack of uniqueness and synchronization between system levels, and difficulty in process tracing. Moreover, it is challenging to meet the technical requirements for close collaboration and rapid iteration of multiple positions. To address the aforementioned limitations, this study proposes a digital overall integrated design method for the design and simulation integration of AUVs and defines a unified architecture and interface for system-level design simulation models, thus solving the interoperability and consistency problems in multiple tools and models. In addition, a model-based AUV system integration design verification method that combines different processes, specifications, and models is designed, and software similar to Cameo, which can provide technical means for system-level integrated design and achieve rapid modeling and simulation verification based on system design solutions, is developed. Finally, a practical system design is conducted by taking specific AUV equipment as a research object, and the proposed methods are compared with traditional methods to prove the improvement effect of the technical route on the equipment and development efficiency.

Research on Intrinsic and Environmental Conditions Hazard Analysis Methods for Civil Aircraft

SAE ARP 4761 stipulates that an area safety analysis must be performed in every area of the aircraft to ensure the safety requirements of the equipment. The study proposes the Intrinsic Hazard Analysis and environmental conditions hazard analysis methods to identify potential neighboring hazard sources, assess the weakness of the area, and solve the problem of incomplete input of area safety analysis. The IEHA analysis method has been verified and applied in the actual type of work, which plays the role of systematic and comprehensive identification of hazard sources and discovery of potential risks, and has practical engineering application for the development of domestic large aircraft. It provides a good theoretical basis and technical reserve for establishing the method and process of civil aircraft safety design verification.

System design and verification of the space station Feitian extravehicular activity spacesuit

<p indent="0mm">According to the mission profile of the space station extravehicular activity (EVA), the functional requirements of the space station EVA spacesuit are analyzed regarding life support and human-suit ability support, and a functional baseline is proposed. The development principle of the space station Feitian EVA spacesuit is described in detail, and the design scheme and verification method of the system and main functional units are given. Compared with the first-generation EVA spacesuit, the innovations and technological breakthroughs of the space station Feitian EVA spacesuit in human-suit ability, service life, safety and reliability, and maintainability are summarized. Moreover, the improvement directions of the EVA spacesuit regarding ergonomic performance, working efficiency, service life, electronic information technology, and a lightweight property are proposed, which can be applied to the subsequent improvement design of the EVA spacesuit and can provide a reference for the system design of lunar spacesuits and future planetary exploration spacesuits.

Analysis of the Influence of Slope Sliding on the Stability of Underground Diaphragm Wall Bridge Foundation Based on Wireless Sensor Network

Real-time monitoring, condition assessment, early warning processing, and damage identification of underground diaphragm wall bridge structures are the current research trends. Based on the wireless sensor network theory, this paper constructs the stability model of the slope sliding on the underground diaphragm wall bridge foundation. The model builds a complete set of underground diaphragm wall bridge vibration signal acquisition and monitoring platform through wireless sensor network node data acquisition and solves the problem of data accuracy measurement by using theoretical analysis, software and hardware design, software simulation, and experimental verification methods. During the simulation process, experiments were designed such as slope sliding vibration signal acquisition data accuracy test, sensor node wireless charging power test and modeling, lithium battery charging power test and modeling, wireless rechargeable sensor node system work test, and other experiments. The experimental results show that the accuracy of the collected vibration signals of the underground diaphragm wall bridge is high, the main working frequency bands are 868 MHz, 915 MHz, and 2.4 GHz, the maximum data transmission rate is 250 Kbps, and the communication distance reaches 100 m, which can meet the requirements of the underground diaphragm wall. The power of wireless charging of lithium batteries reaches 4.5 mW, which effectively improves the stability measurement accuracy of underground diaphragm wall bridge foundations.

Novel step-down topologies of star-connected autotransformer

PurposeThis paper aims to obtain a symmetrical step-down topology with lower equivalent capacity and wider step-down range under the condition of the same output. Two new symmetrical step-down topologies of star-connected autotransformers are proposed in this paper. Taking the equivalent capacity as the main parameter, the obtained topologies are modeled and analyzed in detail.Design/methodology/approachThis paper adopts the research methods of design, modeling, analysis and simulation verification. First, the star-connected autotransformer is redesigned according to the design objective of symmetrical step-down topology. In addition, the mathematical model of two topologies is established and a detailed theoretical analysis is carried out. Finally, the theoretical results are verified by simulation.FindingsTwo symmetrical star-connected autotransformer step-down topologies are designed, the winding configurations of the corresponding topology are presented, the step-down ranges of these three topologies are calculated and the influence of step-down ratio on the equivalent capacity of autotransformer are analyzed. Through analysis, the target step-down topologies are obtained when the step-down ratio is [1.1, 5.4] and [1.1, 1.9] respectively.Research limitations/implicationsBecause the selected research object is only a star-connected autotransformer, the research results may lack generality. Therefore, researchers are encouraged to further study the topologies of other autotransformers.Practical implicationsThis paper includes the implications of the step-down ratio on the equivalent capacity of autotransformers and the configuration of transformer windings.Originality/valueThe topologies designed in this paper enable star-connected autotransformer in the 12-pulse rectifier to be applied in step-down circumstances rather than situations of harmonic reduction only. At the same time, this paper provides a way that can be used to redesign the autotransformer in other multi-pulse rectifier systems, so that those transformers can be used in voltage regulation.

Research on the verification method of flyback high-frequency transformer (FHFT) based on field-circuit coupling model

In view of the current status of research on verification of the correctness and effectiveness of FHFT design, a field-circuit coupling based FHFT design verification method is proposed in this paper. This paper proposes a FHFT design verification method based on field-circuit coupling. The steps of FHFT verification using field-circuit coupling method are elaborated in detail. A three-dimensional physical model of FHFT based on AP method is established. The calculation of FHFT flux density and the verifying of transformer output waveform are completed by using the field-circuit coupling method of alternating iteration of non-linear magnetic field solution and circuit. On the basis of completing the flux density calculation, the field circuit coupling method is used to verify the output waveform of the transformer. It is found that the output waveform of FHFT is not an ideal square wave, but has some distortion, which is caused by neglecting the leakage inductance of transformer in the design process. This shows that the influence of transformer leakage inductance is very important and should be paid attention to.

Widebandlog‐periodicphase shifters

This paper presents concept of wideband log-periodic phase shifter (LPPS) and also three novel microstrip phase shifters using a log-periodic structure for the first time. The process of achieving the goal of wideband releases three main-line models with different characteristics. The design process follows a log-periodic phase shifter theoretical analysis and optimization algorithm of the desired designing platform for circuit tuning. Three proposed main-line log-periodic phase shifters are short-circuited stub LPPS (SS-LPPS), double-sided LPPS (DS-LPPS), and Multilayer coupling LPPS (MC-LPPS). Compact size, planar, ease of fabrication, and wideband are the critical characteristics of the proposed structures. The broadband characteristic of the MC-LPPS is due to top and bottom Log-Periodic microstrip patches broadside coupling of 2 dB through an elliptical slot placed in a ground plane as a middle layer of a structure. Even-odd model analysis of design verification method employed. The optimized overall dimension of the final wideband proposed structure on the low-cost Rogers RO4003C substrate is 35 mm × 20 mm, Fabricated and tested. Experimental and simulation results have good agreement. S11 and S21 are better than −10 and − 1.45 dB in considered 141% fractional bandwidth (1.40-8.11 GHz) for a 130° continuous phase gradient, respectively.

Numerically and Experimentally Verified Design of a Small Wind Turbine with Injection Molded Blade

Although mega-watt class onshore and offshore wind power systems are used to generate power due to their cost-effectiveness, small wind power systems are important for household usages. Researchers have focused on aerodynamic characteristics as a conceptual design from their previous studies on Archimedes spiral wind turbines. Here, we verified the design of a small wind turbine AWM-750D (100 W capacity) via both numerical simulation and experimentation. We used commercial code ANSYS CFX for numerical simulation and compared turbulence models and surface roughness for determining the performance. To obtain reliable and robust blades, we analyzed the effective manufacturing method with Moldflow. Through a test with an open-suction type atmospheric boundary layer wind tunnel, we varied wind speed from 4.0 m/s to the rated value of 12.5 m/s and obtained 106 W, equivalent to a power coefficient of 0.205. In addition, we compared the numerical and experimental power vs. rotational speed and found the former is 6.5% lower than the latter. In this study, we proved that numerical simulations can act as design verification methods to predict wind turbine performances and reliable manufacturing. Through our research, we provided the prototype of a small wind turbine with 100 W to act as an efficient electric power supplier for households and also the stable manufacturing process for complex spiral blades using injection molding.

Research on the Verification Method of Flyback High-Frequency Transformer (FHFT) Based on Field-Circuit Coupling Model

In view of the current status of research on verification of the correctness and effectiveness of FHFT design, a field-circuit coupling based FHFT design verification method is proposed in this paper. This paper proposes a FHFT design verification method based on field-circuit coupling. The steps of FHFT verification using field-circuit coupling method are elaborated in detail. A three-dimensional physical model of FHFT based on AP method is established. The calculation of FHFT flux density and the verifying of transformer output waveform are completed by using the fieldcircuit coupling method of alternating iteration of non-linear magnetic field solution and circuit. On the basis of completing the flux density calculation, the field circuit coupling method is used to verify the output waveform of the transformer. It is found that the output waveform of FHFT is not an ideal square wave, but has some distortion, which is caused by neglecting the leakage inductance of transformer in the design process. This shows that the influence of transformer leakage inductance is very important and should be paid attention to.

Design Verification Method of Offshore Separation Systems Based on System Dynamics

Design Verification Method of Offshore Separation Systems Based on System Dynamics

IEC 61439: Alternate Design Verification Methods

Design verification for low-voltage power switchgear and control gear assemblies is intended to verify compliance of the design of an assembly or assembly system with the requirements of IEC61439 series of standards. There are 3 methods of verification. 1. Verification testing 2. Verification comparison with a tested reference design 3. Verification assessment by calculations and design rules including use of appropriate safety margins. The normally preferred verification method is verification by testing. However, verification by assessment and verification by comparison are also alternate verification methods provided by IEC 61439, which are still unexplored. This is in spite of the fact that IEC 61439 states: “ all the permitted means of design verification which includes comparison and assessment are equivalent in terms of performance achieved.” Here, we shall elaborate on the verification assessment and verification comparison methods for Low voltage switchgear and control gear assemblies.

Design and Verification of Acoustic Room for Consumer Product Safety Testing

Sound Producing Toys consists the sound emitting characteristics to attract children’s attention, such as emitting music or simulating animal’s call. The excess sound pressure level (SPL) could damage the human hearing. The international toy safety standards are established to limit the maximum sound pressure level emitted from the product. The Chief Executive of the Hong Kong SAR established the Task Force on Economic Challenges (TFEC) on October 2008. In early 2009, the TFEC has identified six economic areas where Hong Kong enjoys clear advantages. The Six Industries are (i) testing, inspection and certification (TIC), (ii) medical services, (iii) innovation and technology, (iv) cultural and creative industries, (v) environmental industries, and (vi) educational services. The Open University of Hong Kong is offering the undergraduate degree programmes in testing and certification. For the teaching and research purpose, an acoustic room was built to support the areas of sound pressure level measurement in the Open University of Hong Kong. The acoustic room was primarily designed to serve the sound pressure level measurement of the consumer products, including toys and children’s products and gain the Hong Kong Laboratory Accreditation Scheme (HOKLAS) with reference to ISO/IEC 17025. This paper describes the flow of design, consideration of design factors, verification method, applications and limitations of acoustic chamber.

Novel symmetrical step-down topologies of zigzag autotransformer

PurposeThis paper aims to obtain a symmetrical step-down topology with lower equivalent capacity and wider step-down range under the condition of the same output. Three new symmetrical step-down topologies of zigzag autotransformer are proposed in this paper. Taking the equivalent capacity as the main parameter, the obtained topologies are modeled and analyzed in detail.Design/methodology/approachThis paper adopts the research methods of design, modeling, analysis and simulation verification. First, the zigzag autotransformer is redesigned according to the design objective of symmetrical step-down topology. Second, the mathematical model of the designed topology is established, and the detailed theoretical analysis is carried out. Finally, the theoretical results are verified by simulation.FindingsThree symmetrical zigzag autotransformer step-down topologies are designed, the winding configurations of the corresponding topology are presented, the step-down ranges of these three topologies are calculated and the influence of step-down ratio on equivalent capacity of autotransformer is analyzed. Through analysis, the target step-down topologies are obtained when the step-down ratio is [0.969, 1.414] and [1.414, 8].Research limitations/implicationsBecause the selected research object is only zigzag autotransformer, the research results may lack generality. Therefore, researchers are encouraged to further study topologies of other autotransformers.Practical implicationsThis paper includes the implications of step-down ratio on the equivalent capacity of autotransformer and the configuration of transformer windings.Originality/valueThe topologies designed in this paper enable zigzag autotransformer to be applied in step-down circumstances.

ASIC STA Path Verification Using Semi-Supervised Learning

To counter manufacturing irregularities and ensure ASIC design integrity, it is essential that robust design verification methods are employed. It is possible to ensure such integrity using ASIC static timing analysis (STA) and machine learning. In this research, uniquely devised machine and statistical learning methods which quantify anomalous variations in Register Transfer Level (RTL) or Graphic Design System II (GDSII) format are discussed. To measure the variations in ASIC analysis data, the timing delays in relation to path electrical characteristics are explored. It is shown that semi-supervised learning techniques are powerful tools in characterizing variations within STA path data and have much potential for identifying anomalies in ASIC RTL and GDSII design data.

Perpendicular to grain stress concentrations in glulam beams of irregular shape – finite element modelling in the context of standard design

ABSTRACTThe present paper focuses on the analysis of tensile stresses perpendicular to the grain in both standard and non-standard simply supported beams made of glued laminated timber. The beams are analysed using two methodology approaches: a code design verification method and a finite element method (FEM) in terms of the linear theory of elasticity with plane stress assumption. The analysis is performed for various material parameters both isotropic and orthotropic, proving that both methodologies lead to consistent results in the case of standard glulam beams and therefore the FEM can be used in the case of non-standard structures, which are not included in Eurocode 5.

Use of STPA as a diverse analysis method for optimization and design verification of digital instrumentation and control systems in nuclear power plants

Nuclear power plant operators increasingly face the task of replacing their instrumentation and control (I&C) systems with modern digital systems. This raises the question of safety as the characteristics of the new systems differ from those of the old ones, although they realize the exact same functionality. In the form of a research project and case study, the question about the safety of modern I&C systems was addressed using the risk analysis method Systems-Theoretic Process Analysis (STPA). STPA handles safety as an emergent system property and specifically investigates risks generated by functional interaction between system components. The method does not restrict safety only to component failures, and therefore it seems well suited to address the characteristics of today’s I&C systems adequately. The STPA method was adapted and amended. The verification on a case study showed that STPA is very appropriate for the analysis of digital I&C systems, especially as the method takes a more holistic viewpoint than others. It supports the handling of functional redundancies – a very common design pattern in I&C systems – and allows priorities to be set at any point of the analysis. Focus of this research project was put on the methodology and not on the completeness of the findings resulting from the case study.

Some considerations on perpendicular to grain stress in double-tapered glulam beams

The present paper focuses on the analysis of tensile stresses perpendicular to the grain in simply supported double-tapered beams made of glued laminated timber. Two approaches are compared: a code design verification method and a finite element method (FEM) in terms of the linear theory of elasticity with plane stress assumption. The values and distributions of the analysed stresses are determined, depending on the apex height and orthotropic properties of wood.

Design verification methodology for a solenoid valve for industrial applications

Solenoid operated valves (SOV) are widely used in many applications due to their fast dynamic responses, cost effectiveness, and less contamination sensitive characteristics. In this paper, we tried to provide a convenient method of design verification of SOV to design engineers who depend on their experiences and experiment during design and development process of SOV. First, we summarize a detailed procedure for designing SOVs for industrial applications. All of the design constraints are defined in the first step of the design, and then the detail design procedure is presented based on design experiences as well as various physical and electromagnetic relationships. Secondly, we have suggested a verification method of this design using theoretical relationships, which enables optimal design of SOV from a point of view of safety factor of design attraction force. Lastly, experimental performance tests using several prototypes manufactured based on this design method show that the suggested design verification methodology is appropriate for designing new models of solenoids. We believe that this verification process is novel logic and useful to save time and expenses during development of SOV because verification tests with manufactured specimen may be substituted partly by this verification methodology.

ICONE23-2003 THE RESEARCH FOR THE DESIGN VERIFICATION OF NUCLEAR POWER PLANT BASED ON VR DYNAMIC PLANT

This paper studies a new method of design verification through the VR plant, in order to perform verification & validation the design of plant conform to the requirements of accident emergency. The VR dynamic plant is established by 3D design model and digital maps that composed of GIS system and indoor maps, and driven by the analyze data of design analyzer. The VR plant could present the operation conditions and accident conditions of power plant. This paper simulates the execution of accident procedures, the development of accidents, the evacuation planning of people and so on, based on VR dynamic plant, and ensure that the plant design will not cause bad effect. Besides design verification, simulated result also can be used for optimization of the accident emergency plan, the training of accident plan and emergency accident treatment.

Design of FPB about Bridge in High-Intensity Earthquake Area

In this paper, a seismic isolation scheme by FPB about bridge in high-intensity earthquake area is introduced. Typical methods and calculation examples of using dynamic time-history analysis in this scheme as well as the process and methods of parameter determination and design verification of FPB are put forward. All these methods play guiding roles in the seismic isolation design of bridges and the design and application of FPBs.