Reverse Engineering Technology Research Articles

Assessment of the accuracy of 3D printed medical models through reverse engineering

The dimensional accuracy of additively manufactured (3D printed) medical models can be affected by various parameters. Although different methods are used to evaluate the accuracy of additively manufactured models, this study focused on the investigation of the dimensional accuracy of the medical model based the combination of reverse engineering (RE) and additive manufacturing (AM) technologies. Human femur bone was constructed from CT images and manufactured, using Fortus 450mc Industrial material extrusion 3D Printer. The additive manufactured femur bone was subsequently 3D scanned using three distinct non-contact 3D scanners. MeshLab was used for mesh analysis, while VX Elements was used for post-processing of the point cloud. A combination of the VX Inspect environment and MeshLab was used to evaluate the scanning performance. The deviation of the 3D scanned 3D models from the reference mesh was determined using relative metrics and absolute measurements. The scanners reported deviations ranging from −0.375 mm to 0.388 mm, resulting in a total range of approximately 0.763 mm with average root mean square (RMS) deviation of 0.22 mm. The results indicate that the additively manufactured model, as measured by 3D scanning, has a mean deviation with an average range of approximately 0.46 mm and an average mean value of around 0.16 mm.

Approaches to Extend FPGA Reverse-Engineering Technology from ISE to Vivado

SRAM-based FPGA(Field Programmable Logic Arrays) requires external memory since its internal memory gets erased when power is cut off. The process of transmitting the circuit netlist in bitstream from external memory during power-up in FPGA is vulnerable to malicious attacks such as bitstream theft and tampering. Previous FPGA reverse-engineering methods focus on FPGAs, supported by ISE (ISE Design Suite). This is because ISE provides XDLRC (Xilinx Design Language Routing Configurable logic) and XDL (Xilinx Design language) files, which are essential for reverse engineering. However, Vivado Design Suite (Vivado) does not offer those files, making it impossible to extend the coverage of reverse engineering to the FPGAs supported by Vivado. In this paper, we propose a method to generate XDLRC and XDL through Vivado. According to experimental results, the XDLRC and XDL generated through Vivado, respectively, match 99% and 75% with those generated in ISE for Artix-7 100T. As a result, this paper has expanded the scope of reverse engineering from being mainly focused on ISE to now also include Vivado. It is important to note that this paper does not encourage bitstream attacks through reverse engineering but rather highlights the risk associated with malicious attacks and emphasizes the importance of security.

Sustainable Restoration and Remanufacturing Solution of Obsolete Spare by Advanced Reverse Engineering Technology: A Three-Dimensional Digitization Approach

Sustainable Restoration and Remanufacturing Solution of Obsolete Spare by Advanced Reverse Engineering Technology: A Three-Dimensional Digitization Approach

DESIGN FOR ADDITIVE MANUFACTURING IN THE MEDICAL SECTOR. TOOLS AND STUDY CASE

This work presents a review of the three main axes that constitute the knowledge base when designing products for additive manufacturing in the medical industry: technology, materials and design tools. Through four different study cases of diverse medical products that match the existing categories in the established classification of standards, different design approaches and strategies are presented and suggested as feasible solutions that generate medical products. These cases studies intend to cover some categories where additive manufacturing can be used in the medical sector: a post-surgery protection cast developed using reverse engineering technologies and free-form modelling tools customized not only regarding anatomic shapes but also in terms of aesthetics, a surgical simulator that improves the surgeon’s education process in a non-expensive manner, which could also be shared and spread combining soft and hard parts, a hip surgery retractor designed together with experts that increase the performance of the commercial solutions and a bone replacement implant with an innovative approach that combines engineering polymers with metallic surface coatings. All these case studies present the diversity of possible applications when working with the medical industry, as well as the required skills and knowledge needed to start with this task. Beside this, it has been stated the convenience of engineers to work hand by hand with medical professionals, combining skills and visions to innovate and improve the patient’s journey.

Integration and Development of Reverse Engineering and Digital Manufacturing Technology

Integration and Development of Reverse Engineering and Digital Manufacturing Technology

Optimization of construction parameters for salt cavern underground energy storage using horizontal multi-stage leaching method under different geological conditions

In the thinly bedded rock salt in China, the horizontal multi-stage leaching method can solve the problem of constructing an enormous salt cavern in a limited-thickness salt layer. This study aims to investigate how the final morphology of the salt cavern is affected by critical parameters of the horizontal multi-stage leaching method in different geological conditions, such as the injection rate of freshwater, tubing withdrawal distance, and the presence of an air cushion. These parameters will directly affect the shape of the salt cavern and thus influence the stability of the underground energy storage during operation. We developed an experimental device to simulate salt cavern construction using the horizontal multi-stage leaching method. By varying the parameters in the physical simulation experiments, horizontal salt cavern models with different morphologies and sizes were obtained. The experiments showed that the injection rate of freshwater significantly affects the salt cavern height, length, and maximum width. The tubing withdrawal distance mainly affects the shape of the roof of the salt cavern. Introducing an air cushion to protect the salt cavern roof during the construction of a salt cavern results in a “flat-top” morphology. According to these salt cavern models, three-dimensional geomechanical models for different geological conditions are established by using reverse engineering technology. After analyzing the stability of the salt cavern using these models and combining them with economic factors to recommend values for the critical parameters of horizontal multi-stage leaching method in different geological conditions are provided. This study provides reference value and a theoretical basis for the construction of horizontal salt cavern storage in China.

A novel optimization approach for bio-design of therapeutic compression stockings with pressure fit

For physical-based compression therapeutic modalities, especially compression stockings (CSs), their pressure performances are necessarily evaluated by the standardized cylinder leg mannequins before biological applications. However, the insufficient pressure supply caused by morphological shape diversities between circular leg mannequins and irregular bio-bodies limits the clinical effectiveness and user compliance of CSs. Therefore, an operable and efficiency approach for optimization bio-design and digital development of CSs with enhanced compression performances needs to be proposed. The present study has adopted three-dimensional (3D) body scanning and reverse engineering technologies for lower limb cross-sectional geometric characterization and morphological classification. The irregularity of biological leg circumferential slices was determined and clustered as four levels relating to individual curvature variations. Sequentially, a new pressure prediction model was constructed through characterized geometric variations for bio-based bodies, then its acceptability was validated with good agreement by wearing trials (mean prediction accuracy was 2.53 ± 0.52 mmHg). Thus, the digital pressure reshaped development guidance was obtained based on the classified irregular levels and established pressure prediction models. Consequently, this study provides a novel reliable optimization bio-design solution for manufacturing of therapeutic compression textiles and facilitates the medical efficacy and precision of compression therapy in practical use.

Digital Inheritance of Traditional Mongolian Robes of the Nayman Tribe

Abstract The Mongolian robe is the crystallisation of the wisdom of Mongolian people after a long period of social practice and one of the intangible cultural heritages of humanity. With the gradual disappearance of the nomadic lifestyle in the steppe, it is not easy to protect and pass on traditional Mongolian dress culture and traditional handicraft technology. This study used the digital twin concept to construct a digital twin to try on clothes for a model in a virtual environment, to realise a mirror image presentation of the target physical entity, and to use effective modern technology to protect and pass on the traditional clothing. The experiment used an AlphaM4 3D body scanner to obtain a 3D human body model, as well as reverse engineering technology to process the initial data, such as noise reduction, streamlining, hole patching and smoothing to build a personalised human body model. The traditional black cotton robe of the Nayman tribe researched in the field was mapped by the planar structure design method, and its structure and 2D samples were recovered. A 3D model of the traditional cotton robe of the Nayman tribe was established based on 3D simulation technology to achieve a 3D virtual display effect, enable better dissemination and inheritance, and give a new vitality to non-heritage clothing in the digital era. The research results can provide fresh ideas and technical support for the digital estate and development of other traditional costumes, as well as contribute to the construction of digital resources for intangible cultural heritage.

Research on Secondary Innovation Design of Valve Products based on 3D Printing Technology and Reverse Engineering

This study will take simple valves as the research object, the data extraction of some parts of valves, explore the research idea of three-dimensional model reconstruction of valves based on reverse engineering technology using forward and reverse integration modeling method, and deeply analyze the application prospect of 3D printing technology and reverse engineering technology in the valve industry. For domestic and foreign valve product users to provide rapid prototyping, secondary innovation design can be used for reference ideas.

Use of reverse engineering methods in the process of restoration of machine parts

The paper considers the peculiarities of creating digital copies of objects using reverse engineering technology. The main process used in reverse engineering is the processing of digital copies of objects, which is called photogrammetry. The reverse engineering process consists of the following stages. First, a 3D scan of the product and scan data processing is performed. The received digital data (polygonal mesh) is converted into a CAD file, which can be used to change the shape and topology of the model in accordance with the project. Based on this, an analysis of the two main technologies on which photogrammetry is based was performed: 1) laser triangulation method (laser scanners are used), 2) structured light method (optical scanners are used). The main disadvantages of using laser triangulation when scanning machine parts and methods of reducing their negative impact on the final result are given. The process of determining the position of a point when scanning parts by the laser triangulation method is considered in detail. Equations for normalizing the position of the point and equations that remove the distortion of the point due to the aberration of the camera lens are given. An equation for determining the width of a laser beam is presented, on the basis of which its main geometric characteristics are determined. A general diagram of the influence of the main factors on the quality of the process of scanning parts by the method of laser triangulation is constructed. One of the varieties of scanning objects using structured light is the range imaging (SfM) technique. The SfM technique is a process of estimating a three-dimensional structure from a sequence of two-dimensional images that can be associated with local traffic signals. The position of the camera in space is used to find the x,y,z coordinates of each pixel. An overview of the main software for creating and editing a structured polygonal mesh based on scan data is carried out. As a study of the process of reverse engineering technology, a connecting rod of a car engine was scanned by the SfM method and its digital model was created.

Reverse engineering technology in the process of automotive component innovation

Reverse engineering technology in the process of automotive component innovation

Fracture surface morphology characterization and its influence on plugging performance of granular lost circulation materials

The irregularity and complexity of formation fracture morphology lead to great uncertainty in lost circulation control. At present, the fracture morphology is simplified to be smooth in the process of fracture plugging investigation, thus the influence of fracture surface morphology on the retention behavior and pressure bearing capacity of granular lost circulation materials (LCMs) remains unknown. To fill this gap, the reverse engineering technology was utilized for investigating the influence of fracture surface morphology on plugging performance. In this study, the three-dimensional (3D) reverse reconstruction and quantitative characterization of fracture surface were realized based on the 3D coordinates of real fracture surfaces, which were obtained through the 3D structured light scanning. A new parameter “particle size matching factor” was established to analysis the retention behavior of LCM particles. A new method for fracture plugging experiments was established based on 3D printing technology, which can obtain the structure of the sealing zone in fracture with real morphology. The results show that the irregularity of the real fracture surface leads to the local shrinkage of the flow channels, while provide support force to LCMs, which has an important influence on the plugging performance of LCMs. The larger the “particle size matching factor”, the easier to form retention in fractures. With the increase of Joint Roughness Coefficient (JRC) and fractal dimension, the pressure bearing capacity of the sealing zone is significantly improved. The research results are helpful to more accurately realize the plugging mechanism of granular LCMs, which contributes to improve efficiency of lost circulation control.

Assessment of physiological posterior-tooth displacement under habitual occlusal force by intraoral scanning using implant-supported crowns as the reference

Statement of problemStudies that have used digital methods to quantitatively evaluate physiological tooth displacement under occlusal force are sparse. PurposeThe purpose of this clinical study was to measure physiological posterior tooth displacement under occlusal force by intraoral scanning and reverse engineering technology by using implants as the reference. Material and methodsA total of 14 participants received 15 implant-supported single mandibular first molar crowns. The surface data of maxillary and mandibular posterior teeth (U1 and L1) and the buccal occlusal data in the maximum intercuspal position (MIP) with habitual occlusal force were obtained by using an intraoral scanner (TRIOS 3, v20.1.2). The U1 and L1 data were segmented into single teeth, which were then aligned to the buccal occlusal data by using the “best-fit alignment” command to build the data under occlusal force (U2 and L2). U1 and L1 data were compared with U2 and L2 data to calculate the centroid and functional cusp vertex displacements and the long axis deflections of the second premolars and second molars, taking the first molar as the reference. The medians, and first quartile (Q1), third quartile (Q3) of the above data were reported, and the Shapiro-Wilk and Wilcoxon tests were used to analyze the differences (α=.05). ResultsUnder occlusal force, the median (Q1, Q3) centroid displacements of posterior teeth ranged from 61 (52, 101) μm to 146 (80, 186) μm; the functional cusp vertex displacements ranged from 82 (62, 117) μm to 146 (98, 189) μm, and the long axis deflections ranged from 0.45 (0.25, 0.87) degrees to 1.03 (0.52, 1.41) degrees. Mandibular second premolars displaced lingually, mesially, and apically; mandibular second molars displaced distally and apically; and maxillary second premolars and second molars displaced lingually and apically. ConclusionsA digital method taking implant-supported single crowns as the reference was used to demonstrate physiological posterior-tooth displacement under habitual occlusal force.

Application of rapid prototyping technology in pump engineering

The article presents the results of the use of rapid prototyping technology when modifying the impeller of a centrifugal pump in order to increase efficiency. As a result of the implementation of the technology, the influence of parameters such as the printing speed of the main layers, the printing speed of the current layers, the thickness of the layers on the geometric accuracy of printed products was studied. According to the results of experiments, it was revealed the effect of the feed rate on the OZ axis, an increase in speed will lead to lower surface quality, higher roughness. The distance between the layers is 0,15 mm/s, getting a roughness of Ra 6,3 microns, and in the right case we used a distance of 0,05 mm/s between the layers, getting a roughness of Ra1,6 microns. The article presents the results of the analysis of the effect of exposure time and exposure time in the UV chamber on the hardness of printed products. The article presents a method for determining and compensating the geometry of prototypes based on reverse engineering technology based on the use of an optical scanner. The tests of a centrifugal pump with a prototype of a modified wheel confirm the need for such innovations as rapid prototyping to shorten the design cycle of new products, as well as reduce the cost of their development.

From Reverse Engineering Software to CAD-CAM Systems: How Digital Environment Has Influenced the Clinical Applications in Modern Dentistry and Orthodontics

Background: Reverse engineering (RE) or back engineering is a process that analyzes a physical object to obtain the primary data of the same project. RE technologies have different applications in industrial settings and productive chains; however, with the advent of digital technologies in dentistry and orthodontic fields, they are involved in the new diagnostic and clinical digital workflow. For example, 3D model scanning, 3D facial scanning, models superimposition, digital orthodontic setup, anatomical volumetric assessment, soft tissue analysis, orthodontic digital guided systems, and prototyped orthodontic appliances represent a few examples of the application of RE in orthodontics. Moreover, clinicians can manipulate the data derived from original digital file to enhance diagnosis and communication with other clinicians and dental technicians; however, RE and digital technologies systems are not exempt from shortcomings, including costs and knowledge curve. In this regard, the aim of the present manuscript was to describe the use of reverse engineering technologies in modern digital orthodontics and provide helpful information for those specialists who are at the beginning of the transition from analogic to digital orthodontic workflow.

Chinese Digital Arm (CDA): A High-Precision Digital Arm for Electrical Stimulation Simulation

To effectively analyze the diffusion and accumulation of signals on the surface and inside the human body under electrical stimulation, we used the gray threshold of the Chinese Digital Human image dataset to segment an arm image and reconstruct the tissue to obtain its three-dimensional cloud point dataset. Finally, a semirefined digital arm entity model with the geometric characteristics of the actual human arm tissue was constructed using reverse engineering technology. Further input of the current signal stimulation under tDCS and tACS with additional analysis of the signal diffusion in the transient mode via model calculation revealed that DC electrical stimulation is likely to cause high-voltage burns. The effective depth achieved using the AC stimulation signal is considerable, and provides reference for the electrical stimulation selection. Simultaneously, in the digital arm model, the signal diffusion and tissue damage inside the arm can be analyzed by changing the field, which provides a theoretical basis for the experimental study of the human body.

Research on The Interaction and Correction Strategy of Building Completion Information for Digital Twin

<p>BIM is the core of construction information technology in the current construction industry, and also the main information means in the whole construction cycle, however, BIM has many defects in practical application. The lack of building completion information in the BIM model and the current lag of building information are the main reasons for restricting the intellectualization and digitalization of the construction industry, Thus, the building construction stage is not smooth, and the later operation and maintenance are difficult. Therefore, by referring to the reverse engineering technology of manufacturing industry, this paper expands the building information into real-time and accurate building information by means of Digital twin technology, and reversely guides the construction, operation and maintenance of buildings. Finally, the effectiveness of the strategy discussed in this paper is proved by the actual case analysis.</p> <p> </p>

Collision simulation of potato tubers for mechanized harvesting

AbstractThe economic losses caused by collision damages during mechanical potato harvesting are significant. In this study, the simulation analysis method was used to investigate the factors affecting these mechanical damages. Taking the typical early maturing potato variety Zaodabai as an example, our test results indicated that its elastic modulus is 3.148 MPa, Poisson's ratio is 0.45, and biological yield stress is 1.183 MPa. An accurate three‐dimensional potato model was created using reverse engineering technology. On this basis, the effects of drop height, collision mode, and collision material on the mechanical potato damage were investigated using finite element analysis. The results indicated that the potato damage characteristics become more evident as the drop height increased. Analyzing the collision mode of mechanized potato harvesting revealed that the potato damage degree is the lowest in the double‐rod long axis collision mode. The collision damage degree between a potato and four common collision materials was determined from highest to lowest as follows: 65 Mn rod, 65 Mn rubber‐coated rod, potato, and soil. This research provides a data basis and reference for the design and development of potato harvester equipment, particularly for low‐damage potato harvesters.Practical applicationsAs the fourth largest food crop in the world, potatoes have high economic value and are of great importance for food security. Collision damage in mechanized harvesting seriously reduces the quality and value of potatoes and causes large economic losses. Therefore, we aim to clarify the key factors affecting collision damage in mechanized harvesting. The influence of motion mode, collision height, collision method, and collision material on potato damage characteristics was investigated through simulation experiments. This study provides a data basis and reference methods for developing key components of high‐performance and low‐damage potato harvesters and serves as a reference for researching damage characteristics of other tuber, root, and bulb crops.

Реверсивный инжиниринг – эффективный инструмент обучения инженерной графике

This study proposes the introduction of reverse engineering technology into a graphic workshop in the discipline «Engineering Graphics». The purpose of this study was the scientific and methodological substantiation of the need to use reverse engineering in the methodology of teaching engineering graphics. The article considers the concept of «reverse engineering», its application for solving engineering problems and in the educational process. It is shown that reverse engineering of a part and a sketch of a part are used in solving issues of production organization, in pilot production, repair and other cases, to solve similar and sometimes identical engineering problems. It has been suggested that the technology of reverse engineering in production conditions can replace the function of sketching a part. In the educational process for some areas of training, it is proposed to consider reverse engineering of the part in addition to the topic “part sketch”. A comparison is made of the use of reverse engineering technology and part sketching to solve the engineering problem of obtaining a three-dimensional digital model of a part. As part of the educational process, it is proposed to consider it as a situational or complex task. The scientific and methodological substantiation of the need to use reverse engineering in the methodology of teaching engineering graphics is based on the results of the experiment, which included parallel operations of reverse engineering and part sketching.

Exploration and Application of Loose Leaf Teaching Material Reverse Engineering and Rapid Prototyping Technology under the Background of "Three Education" Reform

Based on the background of the "three education" reform, this project explores the application of loose leaf teaching materials of Reverse Engineering and Rapid Prototyping Technology, fully implements the National Vocational Education Reform Implementation Plan, closely combines the four in one talent training goal of "values+knowledge+skills+innovation", and aims at the teaching materials in the "three education" reform task. In the classroom construction research of Reverse Engineering and Rapid Prototyping Technology, combined with the specific situation of the professional students and their own teaching experience, this paper puts forward the application and exploration of teaching materials for the course of Reverse Engineering and Rapid Prototyping Technology. In view of the characteristics of vocational education, one is to change the proportion of theory and practice in the content of teaching materials, strengthen the connection with production and life, highlight the integration of theory and practice, and pay attention to the renewal and change of learning methods by technological development. The second is to improve the form of teaching materials, supplement the classical paper teaching materials with loose leaf teaching materials to new technologies and processes, build new teaching materials, and break through the status quo of traditional teaching materials, to build a complete curriculum teaching system by constantly improving the digital and information resources of curriculum teaching. In addition, through the improvement of loose leaf teaching materials and innovative research on the teaching mode of combining online and offline courses, we can achieve complementary advantages and promote the optimization of curriculum teaching.