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Digital mockup

A digital mockup (DMU), also known as a digital mock-up, is a three-dimensional representation of a product, , or , created using (CAD) software to simulate its structure, attributes, and functionality without the need for physical prototypes. It serves as a comprehensive digital environment that integrates geometric models, product structures, and for the entire lifecycle of complex engineering projects, from initial design to maintenance and configuration control. Originating in the mid-1980s with the advent of CAD systems, DMUs evolved from earlier physical mock-ups (HMUs) and mock-ups (EMUs), which were labor-intensive and costly models used primarily until the for design verification in industries like . This transition addressed inefficiencies in traditional 2D drawing-based processes, enabling , early issue detection, and iterative improvements under tight timelines, as seen in and commercial programs like the and Airbus A400M. In practice, DMUs facilitate , kinematic , clash detection, and simulations; for example, in certain programs, studies have shown reductions in development time by up to 18% and non-recurring costs by over 50% compared to physical mock-ups, while minimizing issues by approximately 94%. They are widely applied in , automotive, and sectors to support collaborative reviews, planning, maintainability assessments, and even training or marketing, with tools like and Enovia enabling seamless data exchange and variant management. By providing a "sanction-free" space for trade studies and reactivity to changes, DMUs enhance overall product quality and complexity management for systems involving millions of parts.

Overview

Definition

A digital mockup (DMU) is a representation of a product or , created using (CAD) software, that allows for simulation, analysis, and validation without the need for physical construction. This digital prototype integrates detailed geometric models to replicate the physical structure and form of the object, enabling engineers to evaluate design feasibility early in the development process. Key characteristics of a DMU include the incorporation of geometric and kinematic behaviors, like joint movements and assembly dynamics, to support realistic simulations and predictive testing. These elements allow for comprehensive validation of product performance, including checks and , within a fully . In contexts, particularly and industries, DMUs focus on functional and structural validation of complex assemblies. The term "DMU" was coined in the late , coinciding with the widespread adoption of CAD systems, marking the shift from physical to digital prototyping practices.

Importance in product development

Digital mockups play a pivotal role in product lifecycle management () by enabling the early detection of design flaws through virtual simulations and analyses, which minimizes errors before they propagate to later stages. This integration within PLM systems allows for , where design, , and validation occur in a unified digital environment, reducing the need for physical prototypes in terms of both time and cost associated with rework. A key benefit of digital mockups is their facilitation of among multi-disciplinary teams, including , , and experts, who can review and iterate on shared models in via cloud-based platforms. This approach ensures instant and alignment, reducing miscommunications and enabling seamless coordination across global teams without the logistical challenges of physical assemblies. In quantitative terms, the adoption of digital mockups has led to notable efficiencies, such as up to 50% faster time-to-market in projects as of 2025, driven by rapid virtual testing that accelerates development while cutting costs by approximately 30%. Compared to traditional methods reliant on iterative physical builds, digital mockups shift toward virtual simulations that enhance by minimizing material waste, emissions from transportation, and , thereby supporting more efficient and eco-friendly product development processes.

History

Origins in 3D CAD systems

The concept of digital mockup (DMU) emerged in the mid- to late 1980s, closely tied to the widespread adoption of computer-aided design (CAD) systems, which allowed engineers to create virtual representations of complex products for validation and analysis. One pivotal system was , developed by starting in 1977 but gaining significant traction in the 1980s for advanced surface modeling in and automotive applications. By the late 1980s, 's capabilities supported the initial formation of digital mockups by enabling the integration of surface and solid models into cohesive virtual prototypes, marking a shift toward fully digital product development workflows. This development represented a critical transition from traditional 2D drafting practices, where engineers relied on flat drawings and physical prototypes, to techniques that facilitated virtual assemblies. Wireframe modeling, an early 3D method, outlined basic geometries but lacked volume representation, while the introduction of in the 1980s provided parametric, fully defined 3D objects that could be assembled digitally. In the automotive sector, these advancements enabled the replacement of costly physical mockups—such as full-scale clay models—with virtual ones, allowing for earlier detection of design issues and iterative refinements without material waste. A key milestone in this era was the contributions from and , who developed DMU functionalities as add-on modules to existing CAD systems, primarily for clash detection to identify s in virtual . , through its distribution of and integration with systems like CADAM, advanced DMU by emphasizing automated checks that improved validation efficiency. Similarly, advanced 3D CAD capabilities in the through platforms like Unigraphics, supporting workflows for digital prototypes. However, early DMUs faced significant limitations due to hardware constraints prevalent in the , including low power and limited memory in workstations and minicomputers, which restricted the handling of complex simulations and large assemblies. These systems often struggled with rendering detailed interactions or performing clash detections on intricate models, confining DMU applications to simpler validations until advancements in speed and in the 1990s enabled more sophisticated uses.

Evolution in major industries

In the , the adoption of digital mockups (DMUs) began to transform , particularly at , where they were integrated into the planning and design phases of the A380 program launched in late 1999. This enabled the creation of full virtual aircraft mockups, replacing costly physical engineering mockups (EMUs) and allowing for early validation of complex assemblies involving millions of parts. By shifting to DMUs, achieved approximately 50% cost savings compared to traditional EMUs, while improving design iteration efficiency and reducing major issues by up to 94% in subsequent campaigns. During the 2000s, the automotive sector saw expanded DMU integration, with () and advancing approaches that incorporated 3D CAD-based DMUs within broader digital workflows to support vehicle development and minimize physical prototyping needs. The 2010s brought standardization efforts for DMU interoperability, exemplified by the publication of ISO 10303-242 (STEP AP242) in 2014, which defined managed model-based 3D engineering protocols to facilitate seamless data exchange between CAD systems in and automotive applications. This merged prior ISO modules like AP203 and AP214, enabling consistent DMU sharing across supply chains and reducing integration errors in multi-vendor environments. In , applied advanced DMU capabilities during the 787 Dreamliner's development, using and CATIA-based virtual simulations from 2006 onward for assembly planning, which optimized production lines with exact 3D models and cut rework through global engineer collaboration. Post-2020, enhancements in -based DMUs accelerated due to pandemic-driven demands for remote , with platforms like ' 3DEXPERIENCE enabling secure, real-time access to 3D mockups in and automotive sectors. This shift allowed distributed teams to conduct reviews and simulations without physical presence, as seen in Volkswagen's adoption of the -hosted 3DEXPERIENCE for vehicle as of February 2025, which integrated tools for enhanced coordination. In overall, the crisis acted as an , boosting adoption for digital tools by over 50% in some industries to maintain amid disruptions.

Components and processes

Core elements of a digital mockup

A mockup (DMU) is composed of fundamental building blocks that enable its use in product representation and analysis, primarily revolving around geometric and non-geometric integrated within structured hierarchies and varying levels of detail. These elements ensure the mockup serves as a comprehensive digital surrogate for physical prototypes, supporting tasks like and functional in industries such as and automotive. Geometric models form the primary visual and spatial foundation of a DMU, consisting of 3D solids, surfaces, and assemblies that capture the precise shapes and relationships of product components. These models are typically generated from (CAD) systems and exchanged using neutral formats like STEP () or to facilitate interoperability between different software platforms and stakeholders during collaborative development. For instance, STEP files preserve boundary representations and hierarchies, allowing seamless integration of exact without loss of in multi-vendor environments. In applications, such models evolve from preliminary rough shapes to basis-level final geometries, enabling early clash detection and refinements. Complementing the geometry, non-geometric data provides critical contextual attributes that imbue the mockup with realistic behavioral properties for simulation and validation. This includes material properties such as , elasticity, , which inform physical responses under load; tolerances that specify allowable dimensional variations to account for manufacturing imprecision; and kinematic constraints that define motion paths, joints, and degrees of freedom for dynamic interactions. In complex assemblies, kinematic data is categorized by sophistication—ranging from static () to advanced rotations and translations ()—to model mechanisms like flaps or , ensuring the DMU accurately predicts interferences during operation. Tolerances, often integrated via (GD&T) schemas, are essential for assessing stack-up effects in high-precision sectors, where deviations can impact system performance. Material attributes, embedded as part metadata, further enable finite element analysis linkages without altering core geometry. The structure organizes these geometric and non-geometric elements into a logical, multi-level framework, scaling from individual parts to full system assemblies for efficient management of . This structure, often represented as a product tree, defines parent-child relationships, enabling from subcomponents (e.g., fasteners or brackets) to overarching modules (e.g., or sections). aids like exploded views—where components are along axes to reveal internal arrangements—and sectioning—cutting planes to cross-sections—leverage this hierarchy to facilitate studies and checks. In DMUs, for example, a assembly might hierarchically integrate thousands of parts, with exploded representations highlighting cable routing or bolt placements, while section views assess spatial density (e.g., 19.3 parts per cubic meter in certain programs). Such organization supports scalable analysis, reducing navigation challenges in models with millions of elements. Fidelity levels dictate the and of the DMU, balancing computational demands with analytical needs across stages. Low-fidelity representations, such as wireframes or tessellated approximations, use simplified line or polygonal meshes for rapid conceptual validation and space allocation, omitting detailed surfaces to prioritize speed in early iterations. In contrast, high-fidelity models incorporate full representations with textures, lighting, and photometric rendering to simulate photorealistic appearances, supporting advanced and aesthetic reviews. Evolution from low to high mirrors product maturity: initial configured DMUs (CDMUs) focus on basic , progressing to functional DMUs (FDMUs) with and finally industrial DMUs (iDMUs) integrating for near-physical accuracy. In practice, programs achieve high through 100% digital replicas, reducing physical mockup issues by up to 94% compared to traditional methods.

Steps in creation and validation

The creation of a digital mockup commences with initial modeling, where individual parts are developed or imported using methods to define geometric features, dimensions, and attributes that ensure among cross-functional teams in projects. This phase emphasizes the use of standardized formats and , such as product structures and bills of materials, to facilitate seamless and maintain during collaborative development. Once parts are modeled, the assembly process integrates them into a cohesive product representation by applying constraints, including joints, mates, and specifications for , which simulate real-world interactions and enable kinematic analyses of motion. These constraints define relational behaviors, such as alignments and rotations, allowing engineers to replicate sequences and verify functional compatibility without physical prototypes. Validation follows assembly to confirm the mockup's integrity through targeted techniques, including clash detection algorithms that systematically scan for interferences or overlaps between components using geometric computations like NURBS-based clearance analysis. Complementing this, section analysis employs virtual cutting planes to generate cross-sectional views, revealing internal geometries, material distributions, and hidden visibilities for detailed inspection of fit and structural viability. The workflow incorporates an iterative loop where validation outcomes, such as detected clashes or section discrepancies, inform design refinements through feedback mechanisms, prompting modifications to part geometries or constraints. Upon achieving validation criteria, the finalized mockup is exported in manufacturing-compatible formats, like STEP or JT, to support downstream processes including tooling and production planning. This cycle repeats as needed to align the digital representation with evolving project requirements.

Tools and technologies

Primary software platforms

, developed by , stands as a leading platform for digital mockups (DMUs), particularly dominant in the industry where it excels in kinematics simulation and space analysis. These capabilities allow engineers to simulate assembly motions and detect interferences in complex structures, supporting virtual prototyping from concept to validation stages. CATIA's DMU tools handle large-scale assemblies, enabling precise clash detection and measurement in multi-disciplinary environments typical of design. Siemens NX is another primary commercial platform, widely used for automotive simulations within digital mockups. It features advanced tools for evaluating and compartment designs through virtual mockups, facilitating rapid iteration of subsystems and components. NX includes sophisticated meshing capabilities in its advanced module, supporting automatic and manual for and boundary condition applications in contexts. SolidWorks, also from , serves as an entry-level option for DMU creation, ideal for smaller projects requiring straightforward assembly validation. Its built-in interference detection tool identifies clashes between components in assemblies, helping users evaluate and resolve design issues efficiently without advanced setup. This feature is particularly accessible in the standard package, supporting real-time checks for parts and motion-based analyses in compact workflows. For open-source alternatives, provides basic capabilities for creating digital mockups, suitable for non-proprietary assemblies in educational or small-scale applications as of 2025. It offers parametric modeling and assembly tools for sketching to conversions, but remains limited in handling complex, large-scale simulations compared to commercial platforms due to its community-driven development and lack of enterprise-level optimization.

Integration with PLM systems

Digital mockups integrate with product lifecycle management (PLM) systems through bidirectional data exchange, enabling seamless synchronization between digital mockup (DMU) tools and PLM platforms such as ENOVIA and Teamcenter. This exchange supports by automatically propagating updates from design modifications to mockup assemblies, while also transferring like part attributes and assembly hierarchies to maintain across the product development process. Collaborative features in these integrations leverage cloud-based platforms for sharing of DMU files, allowing multi-site teams to conduct reviews and annotations without physical prototypes. This approach reduces silos by providing a unified access point to mockups within the environment, facilitating concurrent edits and feedback loops that accelerate decision-making in distributed workflows. To ensure interoperability, integrations adhere to industry standards, including APIs for direct connectivity and lightweight formats like JT for efficient visualization of complex assemblies in PLM viewers. The JT format, an ISO-standardized 3D data exchange protocol, supports high-fidelity rendering of digital mockups while minimizing file sizes, making it ideal for embedding within PLM systems without compromising performance. In 2025, advanced integrations such as the 3DEXPERIENCE xPDM Adapter for Teamcenter enable bi-directional asynchronous exchange of design and engineering data between ENOVIA/ and Teamcenter, supporting synchronized data coexistence for collaborative processes like part management and manufacturing planning, which minimizes manual data propagation for end-to-end validation.

Applications

Design and assembly validation

Digital mockups enable engineers to verify product designs and assess assembly feasibility in the virtual domain, allowing for early detection of mechanical and geometric issues before committing to physical builds. This validation process integrates models of components to simulate real-world assembly conditions, facilitating iterative refinements that minimize downstream errors and costs. Interference and clash detection represents a core function in this validation, employing automated scanning algorithms to identify overlapping or conflicting geometries among parts. These tools perform static and dynamic analyses to flag potential collisions, such as those between tightly integrated elements, thereby preventing assembly errors that could arise later. In engine component design, for instance, clash detection scans reveal interferences in crankshaft assemblies, enabling designers to resolve issues proactively and ensure smooth integration. Tolerance stack-up analysis further enhances assembly validation by modeling the cumulative effects of dimensional variations across multiple parts. Through simulations or worst-case scenarios, digital mockups propagate along assembly chains to predict whether the final product will meet fit requirements under variability. This approach ensures compliance with specified limits, such as gap tolerances in structural joints, without requiring iterative physical testing. Virtual fit checks complement these methods by simulating insertion paths for components, using path planning to verify unobstructed sequences. In automotive design, this involves mapping trajectories for installing elements like axles or cross-members, confirming clearance during motion and reducing the risk of on-line failures. Pre-physical validation via digital mockups has been shown to reduce physical prototyping and rework costs by 30-50% through early issue resolution, as demonstrated in analyses of virtual prototyping workflows.

Simulation and ergonomics analysis

Digital mockups enable kinematic simulations to analyze the motion of mechanisms without physical prototypes, allowing engineers to study joint movements, trajectories, and interferences in complex assemblies such as robotic arms or automotive suspensions. These simulations compute positions, velocities, and accelerations based on defined constraints like revolute or prismatic joints, providing quantitative insights into mechanism performance under varying conditions. Dynamic simulations extend this by incorporating forces, torques, and inertial effects, enabling the evaluation of stress distributions, power requirements, and stability in systems like aircraft landing gear, where reaction forces and energy dissipation are critical for safety validation. Ergonomics analysis within digital mockups utilizes digital human models, or manikins, to simulate operator interactions and assess physical demands in real-world scenarios. These parametric models, adjustable for anthropometric variations such as height, weight, and distributions, facilitate reachability evaluations by calculating distances and joint angles to determine if controls in cockpits are accessible without excessive . Posture analysis tools within the mockup environment identify awkward positions that could lead to musculoskeletal disorders, such as forward bending in tasks, by applying biomechanical criteria like the Rapid Upper Limb Assessment (RULA) scores. For instance, in automotive lines, manikins help optimize layouts to reduce repetitive , ensuring compliance with standards like ISO 11228 for manual handling. Maintenance simulations leverage digital mockups for virtual disassembly sequences, testing serviceability by simulating access and part removal paths in confined spaces like fuselages. Engineers can iterate on designs to minimize disassembly time and requirements, such as verifying accessibility in engine compartments without physical mockups, thereby reducing lifecycle costs and improving maintainability indices. In civil engineering, these simulations integrate and force feedback to ensure technicians can perform repairs efficiently. As of 2025, advancements in (VR) integration with digital mockups have enhanced immersive ergonomics reviews, allowing stakeholders to interact with human models in a first-person perspective for more intuitive assessments of and reach in dynamic environments. This approach bridges the gap between simulations and real-world usability, enabling collaborative reviews where multiple users evaluate ergonomics or layouts in shared virtual spaces, leading to more accurate predictions of . Recent implementations, such as those combining with digital human modeling, have demonstrated improved fidelity in ergonomic evaluations, particularly in industries like and .

Advantages and challenges

Key benefits

Digital mockups provide significant cost and time savings in workflows by eliminating the need for multiple physical prototypes, which can account for a substantial portion of development expenses. In complex projects, such as those in and automotive industries, the adoption of digital mockups has been shown to reduce design time by up to 45% and lead times by 25%, allowing teams to iterate designs more rapidly without incurring material or fabrication costs. Overall, these virtual representations can cut physical prototyping costs by 50-90%, enabling organizations to allocate budgets more efficiently toward innovation and refinement. The enhanced accuracy of digital mockups stems from their ability to facilitate virtual testing and , which detects a high of potential issues before physical begins. Industry analyses indicate that such virtual prototyping methods can identify a substantial portion of design flaws and errors early in the development cycle, minimizing costly rework and ensuring higher product reliability. This precision is particularly valuable in validation applications, where early detection prevents downstream complications in assembly and performance. From a sustainability perspective, digital mockups contribute to environmental benefits by drastically reducing material waste associated with traditional prototyping. By simulating designs virtually, engineers avoid the consumption of raw materials and energy required for building and discarding physical models, with some implementations achieving up to 30% less material usage in product development. Additionally, digital collaboration tools integrated with mockups decrease the need for and in-person reviews, further lowering carbon emissions and supporting greener practices. Digital mockups enhance scalability by enabling across distributed global teams, fostering collaboration without the risks of version conflicts or data silos. This approach allows multiple disciplines—such as , , and —to work in parallel on a shared model, streamlining workflows and accelerating time-to-market for complex systems.

Limitations and common issues

Digital mockups (DMUs) are susceptible to data accuracy risks stemming from incomplete or outdated CAD models, often resulting in a "" scenario where flawed inputs propagate errors throughout simulations and validations. For instance, missing or unmodeled components, such as bolts in checks, can lead to undetected clashes or false positives in interference analyses, necessitating costly redesigns and delaying project timelines. Poor , including wrong versioning or inconsistent product structures, exacerbates these issues by causing mismatches between design iterations and the virtual prototype. Separate design and review data repositories further compound challenges, increasing the likelihood of outdated information being used in DMU processes. High computational demands pose another significant limitation, particularly for complex assemblies involving large volumes of geometry and . These requirements overwhelm standard systems, with analyses such as clash detection or simulations often taking weeks per design alternative, hindering rapid iteration in dynamic development environments. Performance constraints frequently necessitate splitting models to manageable sizes, which limits the fidelity of full-scale representations and increases processing times for cross-impact evaluations. Consequently, this hardware-intensive nature restricts for small and medium-sized enterprises (SMEs), where insufficient infrastructure and capital act as key barriers to adopting advanced DMU tools. Emerging cloud-based solutions are beginning to address these hardware limitations by enabling scalable processing without local high-end infrastructure. Interoperability challenges arise from format incompatibilities across diverse CAD tools and platforms, complicating data exchange in collaborative environments involving externally sourced components. Heterogeneous toolsets and partial implementations of standards like STEP often result in information loss or mapping errors when integrating CAE data into DMUs, disrupting seamless workflows. These issues are commonly addressed through neutral formats such as STEP for precise geometric exchanges or JT for lightweight visualization and assembly validation, enabling better compatibility without proprietary dependencies. Training barriers represent a persistent hurdle due to the steep learning curves associated with advanced DMU features in software like , requiring specialized knowledge of , sectioning, and space analysis to avoid misuse. Organizations often invest in dedicated roles, such as DMU integrators, and multi-day courses to build expertise, yet gaps in workforce skills persist, leading to inefficiencies in adoption. As of 2025, emerging AI-assisted interfaces in industrial CAD modeling are beginning to mitigate these barriers by providing , intuitive guidance that automates routine tasks and reduces the need for extensive manual training.

Future trends

Transition to digital twins

The transition from digital mockups (DMUs) to digital twins (DTs) represents a fundamental evolution in product representation, shifting from static, design-phase models focused on idealized and validation to dynamic, replicas that mirror physical assets in real time across the entire . This change, accelerating post-2010s, integrates (IoT) sensors to enable continuous data synchronization between the physical product and its virtual counterpart, allowing for ongoing monitoring and adaptation beyond initial design. Unlike DMUs, which remain confined to pre-manufacturing simulations, DTs incorporate as-built variations and operational feedback, transforming them into living models for production, use, and maintenance phases. Key enablers of this shift include and , which extend DMU capabilities from isolated design reviews to comprehensive lifecycle operations. aggregates multi-source data from embedded devices, creating a unified virtual state that reflects real-world conditions with high fidelity. , powered by historical and live data streams, forecasts performance degradation and optimizes interventions, such as maintenance scheduling, thereby reducing and enhancing resource efficiency throughout the product's service life. These technologies build directly on DMU foundations by layering interactivity onto established geometries, enabling proactive decision-making in operational environments. A prominent industry example is General Electric's (GE) application of DTs for , which leverages DMU-derived models augmented with data to monitor asset health. GE's SmartSignal platform fuses data from thousands of s across over 7,000 assets, predicting failures and enabling preemptive repairs that have saved significant operational costs while reducing unplanned downtime. This approach extends traditional DMU validation—used in —to in-service operations, where simulate wear and recommend part replacements months in advance. The timeline of this transition gained momentum in the 2010s with the formalization of the DT concept by Michael Grieves in 2002 and early adoptions by NASA and the U.S. Air Force for aircraft lifecycle prediction. By the 2020s, adoption accelerated due to advancements in 5G connectivity, which supports low-latency IoT data transmission for continuous simulation updates, expanding DTs from episodic design tools to persistent lifecycle companions. The European market for digital twins reached approximately €7 billion as of 2024, aligning with 2022 projections and driven by these enablers that facilitate up to 50% faster time-to-market and 25% improvements in product quality.

Role of AI and emerging tech

Artificial intelligence is revolutionizing digital mockup (DMU) processes through tools that automate the creation of optimized virtual prototypes, particularly in applications where minimizing weight while maximizing structural strength is critical. These AI-driven systems employ algorithms to explore vast design spaces, generating multiple iterations based on constraints such as material properties, load conditions, and manufacturing feasibility, thereby enabling engineers to select superior configurations for integration into DMU assemblies. For instance, NASA's initiatives have demonstrated how AI can produce lightweight components that achieve significant mass reductions, facilitating faster validation in virtual environments. Augmented reality (AR) and virtual reality (VR) technologies enhance DMU validation by overlaying digital models onto physical spaces or prototypes, allowing for immersive real-world assessments that significantly improve ergonomics analysis. AR overlays enable designers to visualize assembly interactions in context, identifying human-factor issues early and reducing physical prototyping needs; studies show such integrations improve ergonomic compliance through precise motion tracking and feedback during validation sessions. In manufacturing settings, VR-based DMU reviews have been shown to cut error rates in ergonomic evaluations by providing interactive simulations that align virtual mockups with operator workflows, promoting safer and more efficient product designs. Machine learning advancements further bolster DMU capabilities by enabling predictive within simulations, automating the identification of deviations in virtual assemblies and thereby reducing reliance on manual inspections. ML models trained on historical simulation data can flag irregularities such as issues or stress concentrations in , with frameworks like those for digital twin-enabled systems achieving detection accuracies exceeding 90%. This approach not only accelerates DMU cycles but also enhances reliability in complex engineering scenarios, such as automotive or validations. Emerging technology addresses challenges in collaborative DMU environments by providing immutable ledgers for securing shared files across distributed teams in management () systems. By hashing DMU files and recording transactions on a , alterations are transparently tracked, preventing tampering and ensuring in multi-stakeholder projects; as of 2025, this is gaining traction as an emerging standard for collaborative CAD/ workflows, with implementations demonstrating reduced dispute resolution times. These integrations complement broader transitions to digital twins by safeguarding the foundational mockup data that feeds into live models.

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