Recent Developments in Hardware-in-the-Loop Testing

Millitzer, Jonathan; Mayer, Dirk; Henke, Christian; Jersch, Torben; Tamm, Christoph; Michael, Jan; Ranisch, Christopher

doi:10.1007/978-3-319-74793-4_10

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…Similarly, testing is one of the vital approaches for assessing and improving software quality (Orso and Rothermel, 2014). Testing, especially the "field testing", is the critical method for validation and reliability analysis of complex mechatronic systems (Millitzer et al, 2019). Therefore, testing has become essential in product design development (PD).…”

Section: Testing Practice/training In Designmentioning

confidence: 99%

Testing in Engineering Design: What Are We Teaching

et al. 2022

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Although testing is critical in industries, the general approaches of testing in engineering design are under-represented in academia. This research investigates the current state of testing based on design textbooks. The findings suggest there is no clear definition of testing. Testing appears in different design stages with adjacent concepts such as prototyping, experimentation, verification, and validation. The processes of testing and its role within engineering design are ambiguous. Recommendations to design educators are provided, and the limitations of the study are discussed.

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Section: Testing Practice/training In Designmentioning

confidence: 99%

Testing in Engineering Design: What Are We Teaching

et al. 2022

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“…Secondly, due to its iterative adaptation process the adaptive controller is able to minimize the controller's objective function even if slight deviations within the system occur. For an overview on possible mHIL control approaches, the reader is kindly referred to [20,21].…”

Section: The Mechanical Hardware-in-the-loop (Mhil) Systemmentioning

confidence: 99%

Tuning and Emulation of Mechanical Characteristics – Tunable Mounts and a Mechanical Hardware-in-the-Loop Approach for More Efficient Research and Testing

Millitzer

Hansmann

Lapiccirella

et al. 2021

Lecture Notes in Mechanical Engineering

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Numerical simulations offer a wide range of benefits, therefore they are widely used in research and development. One of the biggest benefits is the possibility of automated parameter variation. This allow testing different scenarios in a very short period of time. Nevertheless, physical experiments in the laboratory or on a test rig are still necessary and will still be necessary in the future. The physical experiments offer benefits e.g. for very complex and/or nonlinear systems and are needed for the validation of numerical models.Fraunhofer LBF has developed hardware solutions to bring the benefit of rapid and automated parameter variation to experimental environments. These solutions allow the tuning and emulation of the mechanical properties, like stiffness, damping and eigenfrequencies of structures.The work presents two approaches: First a stiffness tunable mount, which has been used in laboratory tests in the field of semi-active load path redistribution. It allowed the researcher to test the semi-active system under different mechanical boundary conditions in a short period of time. Second, a mechanical Hardware-in-the-loop (mHIL) approach for the NVH development of vehicles components is presented. Here a mHIL-system is used to emulate the mechanical characteristics of a vehicle’s body in white in a wide frequency range. This allows the experimental NVH optimization of vehicle components under realistic boundary conditions, without actually needing a (prototype) body in white.

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“…Due to the coupling, the critical components are tested with realistic boundary impedance, and the loading of the components in the test is the same as it will be in real operation. In this work, mechanical-level HiL (denoted as HiL) was employed, which is also called real-time hybrid substructuring/simulation in the literature [13]. In mechanical-level HiL, the dynamical interaction between components of a system is analyzed by the exchange of force and displacement/velocity information.…”

Section: Fundamentals Of Hardware-in-the-loopmentioning

confidence: 99%

Hardware-in-the-Loop Test of a Prosthetic Foot

et al. 2021

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For a targeted development process of foot prostheses, a profound understanding of the dynamic interaction between humans and prostheses is necessary. In engineering, an often employed method to investigate the dynamics of mechanical systems is Hardware-in-the-Loop (HiL). This study conducted a fundamental investigation of whether HiL could be an applicable method to study the dynamics of an amputee wearing a prosthesis. For this purpose, a suitable HiL setup is presented and the first-ever HiL test of a prosthetic foot performed. In this setup, the prosthetic foot was tested on the test bench and coupled in real-time to a cosimulation of the amputee. The amputee was modeled based on the Virtual Pivot Point (VPP) model, and one stride was performed. The Center of Mass (CoM) trajectory, the Ground Reaction Forces (GRFs), and the hip torque were qualitatively analyzed. The results revealed that the basic gait characteristics of the VPP model can be replicated in the HiL test. Still, there were several limitations in the presented HiL setup, such as the limited actuator performance. The results implied that HiL may be a suitable method for testing foot prostheses. Future work will therefore investigate whether changes in the gait pattern can be observed by using different foot prostheses in the HiL test.

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Recent Developments in Hardware-in-the-Loop Testing

Cited by 12 publications

References 20 publications

Testing in Engineering Design: What Are We Teaching

Testing in Engineering Design: What Are We Teaching

Tuning and Emulation of Mechanical Characteristics – Tunable Mounts and a Mechanical Hardware-in-the-Loop Approach for More Efficient Research and Testing

Hardware-in-the-Loop Test of a Prosthetic Foot

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