http://yetl.yabesh.ir/yetl1/handle/yetl/19051 2026-08-24T04:19:07Z 2026-08-24T04:19:07Z Letting, Cynthia Ali Ahmed, Nour Masters, Bart Dudas, Patrick M. Parkinson, Matthew Menold, Jessica http://yetl.yabesh.ir/yetl1/handle/yetl/4316897 2026-08-23T08:41:17Z 2026-01-01T00:00:00Z

The Incubator: A Serious Game to Study Decision-Making in Product Development Letting, Cynthia; Ali Ahmed, Nour; Masters, Bart; Dudas, Patrick M.; Parkinson, Matthew; Menold, Jessica Abstract. The study of design decision-making, specifically, and design cognition, more broadly, is dependent upon the researcher’s ability to balance the authenticity of the research task and the level of intervention needed to accurately measure the construct of interest. They must either commit to ethnographic long-term studies of design teams, which require extensive time and resources and are not feasibly scaled, or commit to smaller, more controlled studies that often sacrifice the authenticity of the design task itself. To mitigate some of this research burden, researchers have explored alternative methods for data collection, one of which is serious games. Serious games have emerged as a novel way to study human decision-making and provide a controlled yet flexible environment to conduct studies and automate data collection. Little work has explored the use of serious games as a platform for design studies. The objective of this technical brief is to introduce a novel simulation environment, “The Incubator,” a serious game that mimics the product development process under controlled conditions. The Incubator provides a data-rich platform for analyzing how designers allocate resources, negotiate trade-offs, and adapt to changing constraints during new product development. The goal of this technical brief is to describe the theoretical and computational underpinnings of the game and encourage the use of The Incubator as a platform to study design decision-making at large scales.

2026-01-01T00:00:00Z Ahi, T. Kahraman, A. Donmez, A. http://yetl.yabesh.ir/yetl1/handle/yetl/4316894 2026-08-23T08:41:13Z 2026-01-01T00:00:00Z

Dynamic Behavior of Helical Gear Pairs: Model and Experiments Ahi, T.; Kahraman, A.; Donmez, A. Abstract. While helical gears are critical components of many power transmission systems, their dynamic behavior has not been studied extensively, perhaps due to their complex vibratory motions and lack of experimental data to guide sound modeling efforts. This study proposes a general dynamic model of a helical gear pair supported by realistic shaft-bearing structures. Aiming at the examination of main assumptions regarding the modeling of helical gears, two versions of the model are constructed, a nonlinear time-varying (NTV) version with gear backlash and time variation of gear mesh stiffness included, and a linear time-invariant (LTI) version, both subject to nonproportional damping. An extensive experimental study is performed covering a large portion of the helical gear design space. Simulations of these experiments indicate that the LTI version of the model with both backlash and mesh stiffness variations ignored compares well with the experiments. The model predictions and measurements collectively show that a helical gear pair acts as a linear system with the loaded motion transmission error as its main excitation. They also indicate that the helical gear motions are three-dimensional, requiring an accurate description of the support structures in the model.

2026-01-01T00:00:00Z Li, Fan Deng, Xingqiao Dai, Jiansheng Zeng, Liyuan Wang, Shisong Wang, Haowen Zeng, Zhulin http://yetl.yabesh.ir/yetl1/handle/yetl/4316893 2026-08-23T08:41:11Z 2026-01-01T00:00:00Z

A Design Method for Logarithmic Spiral Movable Tooth Drive to Avoid Curvature Interference Li, Fan; Deng, Xingqiao; Dai, Jiansheng; Zeng, Liyuan; Wang, Shisong; Wang, Haowen; Zeng, Zhulin Abstract. Logarithmic Spiral Movable Tooth Drive (LSMTD) is a novel type of precision heavy-duty transmission that possesses a wide array of potential applications in the field of robotic joints. Due to the unique transmission principle, the influence of design parameters on tooth profile curvature is significant. Inappropriate design parameters can lead to curvature interference, resulting in tooth profile top cutting and subsequent transmission failure. However, the lack of research on the curvature interference characteristics of LSMTD seriously restricts the development of forward design methods. To solve this problem, this study proposes a design method to avoid curvature interference. First, a curvature interference analysis model for LSMTD is established based on coordinate transformation and the meshing principle. This model is used to analyze the relationship between top cutting and curvature interference. On this basis, the influence of design parameters on tooth profile curvature is quantitatively analyzed through orthogonal experiments. A curvature interference boundary equation is established. With the validity of the equation verified, the distribution of curvature interference boundary lines is analyzed. Finally, the effectiveness of the proposed design method is validated through a design example, and a robotic joint component is manufactured. This study holds significant implications for the forward design of LSMTD.

2026-01-01T00:00:00Z Park, So-Jeong Lee, Sang-June Jung, Gwang-Pil Lee, Dae-Young http://yetl.yabesh.ir/yetl1/handle/yetl/4316892 2026-08-23T08:41:06Z 2026-01-01T00:00:00Z

A Curvature-Tunable Deployable Origami Boom With Facet-Integrated Self-Locking Mechanism Park, So-Jeong; Lee, Sang-June; Jung, Gwang-Pil; Lee, Dae-Young Abstract. Recent advances in technology have expanded the space industry, but there are still volume limitations on carriers, which translates directly into cost. Deployable structures can overcome these limitations and are used especially in space in a variety of ways. In this article, this study proposes a curvature-adjustable origami boom incorporating a plane-induced based self-locking mechanism. The Kirigami locker, which deploys with the pattern and is self-locking, can increase rigidity while minimizing the increase in storage volume. By utilizing the characteristics of the Miura pattern, the results show a difference in compressive and bending stiffness of up to 6.29 and 3.5 times, respectively, with and without the locking segment. In addition, the curvature can be freely designed through pattern variation, and booms with multiple curvatures can be produced. This enables the design of a variety of highly rigid and deployable structures, ranging from small sizes such as tables to large structures, including shelters and masts, which can be deployed with few degrees-of-freedom.

2026-01-01T00:00:00Z