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Process-Based Digital Twin for Industrialized Construction Efficiencies

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Construction in the United States has long been a profitable industry with little meaningful innovation over the last 100 years with the intention to increase the speed, and lower the cost, to build. Growing labor and supply chain challenges, as well as the overwhelming need to build better buildings has provided an opportunity for industrialized construction (IC) to gain a greater portion of the market share. Optimizing factory processes and material improvements to increase productivity through the use of digital twins will be crucial for enabling stakeholders to analyze potential expenses and disruptions in a factory line.

This article discusses the process and tools used to create a modular construction factory digital twin and how it can be used to improve overall factory production. We'll also present preliminary results from an ongoing project using a digital twin to integrate energy efficiency technologies into modular buildings with little or no additional lead time and first cost.

The Need for Industrialized Construction

While the United States struggles to keep up with the necessary speed of construction, projects are being offshored to companies in other countries who are able to complete jobs in less time. Modernizing the U.S. construction industry has never been more important for keeping local jobs and billions of dollars in the states. In 2019, off-site construction represented only $50 billion of the $1.3 trillion value of U.S. total construction put-in-place (with materials and labor representing the rest). There is obvious room for improvement; however, the construction industry is consistently risk averse with little to no R&D investment.

Off-site Advantage: Twice the Speed / Half the Cost
Off-site advantage: twice the speed, half the cost.

The U.S. construction process is still largely a manual one, including inside modular factories. Many modular units are still stick-framed very much like the on-site process. This is not to say that modular is not more efficient, but many of the 200+ modular factories in the U.S. need to consider new processes and products in order to move away from their current on-site mentality to a more controlled, standardized, and repeatable manufacturing mentality.

Related: Extending the Value of BIM to Owners with a Digital Twin

Typically, one or more of the following elements would be found in off-site construction:

  • Components: Elements that can be combined together to comprise full systems and/or assemblies such as trusses or mullions.

  • Assemblies: Large building elements that require minimal finishes after installation such as flooring or façade panels.

  • Modules: Complete building modules requiring little to no additional finishes after on-site installation. This can include, but is not limited to, hotels, hospital rooms, multifamily buildings, and dormitories.

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Manufacturing centricity: embracing productization and prefabrication.

The goal of any factory is to continuously optimize production in order to increase throughput, while managing cost and quality. There is very little factory data collected related to the production process on the manufacturing floor making it very difficult to know where to begin the optimization process. This gap, The Invisible Factory Dilemma, is where a virtual digital twin, along with sensors, can start to inform better decision making and remove bottlenecks.

Digital Twin

A digital twin is simply a virtual model of a process, product, or service that enables the pairing of virtual and physical worlds. It is useful in the analysis of data and the monitoring of systems to mitigate costly expenses or disruptions before they occur. Digital twins are used to develop future processes or new opportunities by using simulations and have been used in many industries including space, energy, automotive, oil and gas, healthcare, farming, and even city planning (there’s a digital twin of Singapore).

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Current usage of digital twins in AEC primarily surrounds building operation and maintenance (Qiuchen et al., 2020) and construction schedules for project management (Yusen et al., 2018) and focuses mainly on the built product. We are focused on the building process.

Novel Capabilities of Advanced Time-and-Motion Study and Process-Based Digital Twin
Novel capabilities of advanced time-and-motion study and process-based digital twin.

The figure above shows a high-level concept for collecting various types of data from a factory, its resources, and the module that is ultimately built. That information is used to update a digital twin of the entire factory process. All of this is done with the goal of improving the construction of modules by analyzing data from the real world and performing various optimizations within the digital twin.

Until recently there was no real way to analyze how the various elements of a factory come together and work to create the modules. In order to develop a process digital twin for a modular factory, four elements need to be taken into consideration: the space in the factory, the equipment available, the labor or human workers, and the materials involved.

The result is discrete event simulation (DES), a method for simulating processes as discrete activities that are dependent on the availability of resources. DES is a highly detailed and faithful virtual representation of what happens on the factory floor (image below) depicting how human workers handle materials and interact with the equipment in the factory. With the basic virtual model, factory managers can change the number of workers or stations and receive real data on how the change would affect both the build time, as well as the usage of space and resources.

Screenshot of detailed modeling of work processes
Screenshot of detailed modeling of work processes.

Steps to Measuring and Optimizing Baseline Performance With Discrete Event Simulation

1. A Factory Information Model (FIM) is first created using discrete event simulation and virtual reality. A FIM is a digital representation of a modular construction factory that integrates information regarding its physical layout, interaction between multiple heterogeneous resources, and underlying process maps. More precisely, it is a dynamic virtual model of the factory that is more than the sum of its individual components including static 3D CAD models of the IC factory floor and equipment, and nonvisual schematics of process flows.

2. A library of physical activities commonly performed in the factory must be produced and cataloged and would include activities such as:

    a. Human laborers hammering, using nail guns, walking, carrying loads

    b. Cranes lifting, moving, and lowering loads

    c. Forklifts loading, moving, and unloading material

3. A station library is created of every clearly marked physical workspace on the factory floor that is reserved for the performance of a specific set of activities in the construction of a modular unit. Computer vision is being tested to track the presence of modular units in different stations. This allows a high level of insight into the allocation of resources and process performance in a factory, and provides data that can be input directly into the factory models to enable further analysis and forecasting.

4. The model can be updated using a variety of sensors that can automatically measure and report performance to the digital model to provide insights and forecasts. We are currently testing inertial measurement units (IMUs) to detect the vibrations and movements of modules. The obtained data was trained with machine learning methods to determine if the current station and state (idle/ busy/ moving) of the units could be determined. This enables the calculation of time of each box at each station and could be directly used as input for the overview model to forecast factory performance (94% prediction accuracy using test data).

Left: Primary elements for DES model; Middle: Small portion of a DES model using available resources; Right: Activities and resources can be added to build up larger operations. In live mode the simulation would demonstrate how activities start, how they are interdependent on previous activities ending, as well as the availability of resources.
Primary elements for DES model (left); a small portion of a DES model using available resources (center); activities and resources added to build up larger operations (right). In live mode, the simulation would demonstrate how activities start, how they are interdependent on previous activities ending, and the availability of resources.
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Computer vision being employed to track modules and provide data for the DES.

Leveraging Process-Based Digital Twin to Improve Factories and Products

Visualizing factory processes in a digital twin will enable all stakeholders to interact on a greater level with the decision-making process. Whether a material change, a factory process, or automation implementation, they will have the ability to virtually see the benefits or consequences in a real-time scenario and make performance improvements to the factory.

Integrating Energy Efficiency into Industrialized Construction

We are not only developing approaches to benefit the industrialization of construction to increase productivity. In addition to advanced manufacturing tools and process efficiency strategies, we are also looking at integrating energy efficiency strategies into our research. This novel, integrated workflow can be leveraged across the industry to ensure wider adoption of energy efficiency integration during permanent modular construction.

Road Map for Process Analysis

The envisioned workflow for the holistic analysis of modular construction factories is presented in the figure below. The goal is to quantify performance of the production line in terms of time and cost for producing modules, along with the energy benefits provided by the energy efficiency (EE) strategy. The Factory Information Model will work alongside the existing Building Energy Models (BEM) to provide analysis of the process performance. The FIM will be preloaded with a library of common activities, stations, and underlying processes, along with the layout of the factory itself.

Overview of envisioned workflow for holistic analysis of EE strategy intro to modular factory
Overview of envisioned workflow for holistic analysis of EE strategy for the modular factory.

The FIM will then take as input the Industry Foundation Classes (IFC)-based Building Information Model (BIM) of the modular units to be constructed, along with the EE strategy under consideration. Note that IFC facilitates the sharing and exchange of information among IFC-compatible software applications such as the ability to import BIM directly to other tools (Unity3D and EnergyPlus, for example). BIM technology allows users to create a digital representation of a physical building. Virtual Design and Construction (VDC) is a similar technology but differs in purpose as it allows companies to analyze construction plans from start to finish before breaking ground.

The results of the FIM will be provided in terms of cost and time implications for the manufacturer when they introduce the EE strategy into the assembly line. The following subsections will describe the role of each component of the FIM in producing the desired results for analysis.

An Integrated Workflow to Deliver Efficient Buildings

Inputs from designed BIM models, including geometric and nongeometric data of energy efficiency strategies and building components, can be effectively analyzed using discrete event simulation modeling. The key performance metrics of cost, time, and energy efficiency improvements are outputs specific to each strategy.

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The selected strategies currently under study leveraging a process-based digital twin are easy to integrate in an off-site modular construction factory. These strategies include advanced envelope techniques, smart apartment controls platform, integrated mechanical pods, and factory assembled building solar systems. As part of this research project, led by the National Renewable Energy Laboratory, we are analyzing product-process improvements for each of these strategies.

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In-Factory Aerosol-Based Sealing Process for Improved Air-Tightness of Built Product

Sensors and cameras are being utilized to perform time and motion studies during in-factory air sealing of modular units in partnership with Volumetric Building Companies. The in-,factory data collection serves as inputs of time, cost, and final air-tightness to the discrete event simulation model. Using a baseline of on-site sealing, the analysis showed a lower starting ACH than on-site as well as reduced prep and sealing time of 40%-60%. Due to significantly faster sealing time, off-site sealing brings costs down by 40%.

Such comparative analyses using data from in-factory pilot demonstrations, discrete event simulation modeling, and process-based digital twin are being performed for other identified strategies as well.

In-Factory Wall Framing

Another envelope strategy being researched is adding insulation in-factory using thermally-broken studs as opposed to adding continuous insulation on-site. The key performance metrics remain the same given the strategy meets the same or better product efficiency versus the baseline envelope.

Centralized MEP System Versus In-Unit Integrated MEP Pods

In-unit integrated MEP pods would enable apartment compartmentalization, as opposed to centralized MEP systems. Unlike traditional construction, almost all MEP systems could be fabricated at a single off-site facility prior to in-unit installations on-site. We are moving towards data collection of this strategy through pilot demonstration and prototyping at the National Renewable Energy Laboratory campus.

Automation Integration and Continuous Improvement

As part of this research, we are developing an inherent capability with the process-based digital twin to provide guidance on introducing automation to a primarily manual construction process in the factory. Process engineers of modular construction factories can phase-in increasing levels of automation by first understanding its implications to performance metrics in the digital twin environment. For example, the capability would allow the user to drag-drop-swap between a fully manual framing station and a human- supervised machine-meditated framing station for the same factory line.

The ongoing research project is an attempt to kick off a shared development platform of process-product innovation within the building industry through which a broad range of stakeholders can engage and leverage learnings from digital twin-based optimized improvements. Through this, we aim to ensure wider adoption of such means, methods, and novel tools to deliver products that are healthier, more affordable, and energy efficient by ensuring improved productivity, quality, and affordability of building construction processes.

In conclusion, the United States construction industry is skewed towards on-site construction. A rebalancing towards more off-site practices is essential to dealing with the current industry challenges. The off-site construction industry has the ability to more effectively perform highly repetitive construction activities at significant cost, labor, and time savings but powerful tools like the process-based digital twin are needed to truly transform and industrialize our industry.

Learn more with the full class.

Dr. Joseph Louis’s research interest lies at the intersection of simulation, visualization, and automation within the context of construction operations. He draws upon concepts in these areas to provide construction managers with better means of planning, monitoring, and controlling their operations to improve safety, maximize productivities, and minimize equipment idle times. Dr. Louis is passionate about engaging with the broader community and has organized university-level TEDx talks.

Ankur Podder joined the Industrialized Construction Innovation (ICI) team at NREL in 2019 with a focus on advanced manufacturing of buildings and integration science. His research work aims to facilitate the integration of a wide range of energy efficiency strategies and distributed energy resources during factory production of permanent modular buildings. His work involves strategizing the blending of factory information modeling and building information modeling into NREL's building energy modeling capabilities as well as accelerating whole building systems integration in upcoming modular net-zero energy buildings.

Colby Swanson is a serial entrepreneur, innovation strategist, and construction technologist who has spent over 20 years in the building industry gaining a 360-degree understanding of the construction space. He is currently the managing partner at Momentum Innovation Group (MIG), an innovation consulting firm helping clients drive transformation in their business and find unseen areas of opportunity and growth. He also serves as the director of the Modular Mobilization Coalition, 15+ modular construction companies with a nationwide network of two dozen factories.

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We use ADC Media to deploy digital advertising on sites supported by ADC Media. Ads are based on both ADC Media data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that ADC Media has collected from you. We use the data that we provide to ADC Media to better customize your digital advertising experience and present you with more relevant ads. ADC Media Privacy Policy
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We use AgrantSEM to deploy digital advertising on sites supported by AgrantSEM. Ads are based on both AgrantSEM data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that AgrantSEM has collected from you. We use the data that we provide to AgrantSEM to better customize your digital advertising experience and present you with more relevant ads. AgrantSEM Privacy Policy
Bidtellect
We use Bidtellect to deploy digital advertising on sites supported by Bidtellect. Ads are based on both Bidtellect data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Bidtellect has collected from you. We use the data that we provide to Bidtellect to better customize your digital advertising experience and present you with more relevant ads. Bidtellect Privacy Policy
Bing
We use Bing to deploy digital advertising on sites supported by Bing. Ads are based on both Bing data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Bing has collected from you. We use the data that we provide to Bing to better customize your digital advertising experience and present you with more relevant ads. Bing Privacy Policy
G2Crowd
We use G2Crowd to deploy digital advertising on sites supported by G2Crowd. Ads are based on both G2Crowd data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that G2Crowd has collected from you. We use the data that we provide to G2Crowd to better customize your digital advertising experience and present you with more relevant ads. G2Crowd Privacy Policy
NMPI Display
We use NMPI Display to deploy digital advertising on sites supported by NMPI Display. Ads are based on both NMPI Display data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that NMPI Display has collected from you. We use the data that we provide to NMPI Display to better customize your digital advertising experience and present you with more relevant ads. NMPI Display Privacy Policy
VK
We use VK to deploy digital advertising on sites supported by VK. Ads are based on both VK data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that VK has collected from you. We use the data that we provide to VK to better customize your digital advertising experience and present you with more relevant ads. VK Privacy Policy
Adobe Target
We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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