Hardware-in-the-Loop Simulation

Comprehensive development and testing tools for any simulation

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Real-Time Simulation for Complex, Mission-Critical Systems 

In industries where precision, reliability, and safety are paramount such as aerospace, defense,  and transportation the ability to simulate real-world conditions in real time is essential. Hardware-in-the-Loop (HiL) and X-in-the-Loop (XiL) simulations enable engineers to validate embedded systems, control logic, and complex algorithms under conditions that closely mirror live operation without the risk or cost of full deployment. 

Concurrent Real-Time provides a powerful platform for developing and executing real-time simulations that demand deterministic, low-latency behavior. At the core of our simulation solutions is SIMulation Workbench running on RedHawk Linux, a real-time operating system proven in the most demanding environments. 

From avionics systems to autonomous vehicles, our HiL and XiL solutions help reduce development cycles, improve product integrity, and accelerate certification and deployment timelines. Our platforms are designed to scale across simulation types and support integration with a wide range of modeling, visualization, and control tools. 

Comprehensive Real-Time Simulation Tools for HiL and XiL Workflows 

Concurrent Real-Time offers a complete suite of tools and platforms for developing, executing, and analyzing real-time simulations across all forms of X-in-the-Loop (XiL) testing. Built on our RedHawk Linux operating system and powered by SIMulation Workbench, these solutions are engineered to support deterministic behavior, seamless model integration, and rapid test development. From embedded software validation to full-system integration, our real-time simulation environment is designed to scale with your needs enabling reliable, high-performance testing in safety-critical and performance-driven industries. 

Concurrent’s simulation framework is purpose-built to deliver real-time performance across all layers of a simulation stack. RedHawk Linux ensures deterministic response times for time-critical signal processing and simulation synchronization, while SimWB manages real-time execution of complex models with sub-millisecond accuracy. 

A modular, high-performance real-time simulation environment for HiL and XiL applications. SimWB supports: 

  • Software-in-the-Loop (SiL) 
  • Model-in-the-Loop (MiL) 
  • Hardware-in-the-Loop (HiL) 
  • Main-in-the-Loop (HiTL) 
  • AI-in-the-Loop (AIiL) 

SimWB enables rapid model deployment, real-time scheduling, multi-rate simulation execution, and seamless I/O integration. It is compatible with models written in C, C++, Fortran, and with major simulation environments such as: 

Simulink, CarSim, rFPro, SIMPACK, DYNA4, PreScan, VIGrade, FlightGear, ADAMS, MapleSim, Dymola, and more. 

Learn More about Simulation WorkBench

Our solutions are fully customizable and support a variety of simulation workflows. Whether you’re developing new control logic or validating AI-driven systems, our tools integrate easily with your existing toolchain. Simulation models can be built using commercial tools or custom code and executed deterministically on Concurrent’s iHawk systems. 

Proven Use Cases MiL 

  • Ares I Launch Vehicle System Integration Laboratories selected RedHawk Linux to power real-time simulation and integration of critical systems for spaceflight operations. 
  • VI-Grade’s AutoHawk system, a configurable HiL solution for automotive testing, uses Concurrent Real-Time platforms to run high-fidelity vehicle dynamics models in real time. 

Professional Services MiL 


Our team offers expert support for: 

  • Custom I/O integration and test stand development 
  • Simulation model porting and optimization 
  • Real-time system configuration and tuning 
  • Consulting for certification and safety-critical workflows