Ariens of Brillion, WI uses True-Load to understand the complex loading on their tractors. This article shows the application of True-Load on a tractor frame. The article includes a link to an interview with an Ariens Engineer.
This is a peer-reviewed article published in the Journal of Vibration and Acoustics. The paper demonstrates the mathematical foundation for the True-Load technology.
This paper documents the application of the True-Load technology to engine mounts on a Chrysler vehicle. The paper was written in conjuction with the Chrysler Tech Center.
This paper describes the use of True-Load, and FEA based fatigue weld analysis to evaluate the durability of a front-end loader linkage. True-Load software along with unit load FEA was used to determine time history loads for a field operation with dynamic loading that resulted in fatigue failures of the linkage. The time history loading was then used to compare the durability of design alternatives and determine a design that met the simulation criteria.
This peer-reviewed paper was used to measure the loads on high speed train wheel / axle system. True-Load software provides a proven mathematical method combined with the finite element technique to obtain loads from strain measurement. This paper studies a wheel set using this algorithm. This paper provides reference values for the reliable application of this load calculation from strain gauge measurement method.
This paper presents the application of True-Load to K-Tec Earth Movers' 1243 ADT Scraper. A full explanation of the approach is shown. Non-intuitive results were obtained about the loading events with the most severe damage.
This peer-reviewed SAE paper shows the application of the True-Load methodology to a student SAE Baja car. The UW-Milwaukee students were able to use the loading from True-Load to reduce the weight of their suspension arm by 25%. For the students this was the first time they had ever built a real FEA model, used a strain gauge, or performed data collection. They were able to complete the project in 6 weeks with coaching from Wolf Star Technologies.
This peer-reviewed paper illustrates the application of True-Load to a modal dynamic problem. Illustrated in the paper is back calculation of modal participation factors and operating deflection shapes. A simple cantilever beam and a motorcyle headlamp are shown as examples in the paper.
Trek bicycles uses True-Load to understand the road loading on their frames and components. Shown in this paper are loading from extreme events including jumps. Correlation plots between measured strain and simulated strain along with operating deflection shapes are referenced in the paper.
In this study presented at the NAFEMS CAASE conference in 2018, Wolf Star Technologies True-Load software along with unit load FEA analysis was used to determine time history loads for in service operation with dynamic loading on a Razor™ scooter. Using traditional methodology, the test article would need to be substantially modified in order to use commercial load transducers which would ultimately change the mass and stiffness of the system and render the the scooter inoperable. The True-Load technique presented here required no changes to the underlying structure and only used simple uniaxial strain gauges.
Brice Willis, Steve Walters. Honda R&D Americas, Inc. True-Load was used in conjunction with measured strain data to determine the root cause of a stress failure on a steel tube press-fit into an aluminum casting installed on a Honda car engine. Traditionally, the many loads on an engine during operation cannot be measured without completely changing the system. True-Load enabled identification of the cause of failure, facilitating future design.
Nathan Marks, Sr. Mechanical Engineer. Applied Technology, Cummins Power Systems, Fridley USA. The addition of True-Load to ANSYS simulation tools increased the speed and accuracy of simulations. True-Load informed strain gauge placement to ensure reliable data was collected during testing. True-Load modal participation functions also helped streamline redesign evaluation.
Mathieu Lussier ing. M.SC.A. MBA (Optimec Consultants inc., Canada); David Paquette ing. (Agnico Eagle, Canada); Tim Hunter, PhD, PE (Wolf Star Technologies, LLC, USA); In such a dynamic application, accurate loads assessment is almost impossible unless measuring them during operations. Furthermore, when fatigue is studied, understanding of loads variations is very important as it can have a large impact on results. True-Load technology combined with ABAQUS was a big help to understand the dynamic loads on the car, which is an important step in order to improve the design and solve the problem.
Digital Twin applications that integrate in-situ load measurements with periodically updated simulations of remaining fatigue life hold great promise for creating huge value in maintenance and logistical operations. In this work, the authors implement two commercially available, off-the-shelf solutions to create a closed loop pogo stick digital twin that tracks damage accumulation due to actual loads experienced from the steel pogo stick.
针对机械结构在复杂工况下载荷边界条件难以确定的问题，提出一种仿真与实测多信息融合的外载荷反演技术。首先建立待研究结构的有限元模型，在结构外载荷作用位置施加单位载荷，计算构件全场应变响应；然后基于Ｄ-最优设计原则得到应变测试的测点最佳布置方案和最优载荷系数矩阵，据此建立外载荷与应变间的动态响应关系；根据得到的测点布置方案，在结构上粘贴应变片，测得机械结构在实际工作过程中的动态应变历程，基于该实测应变历程以及载荷与应变的响应关系，反演结构的动态外载荷历程。以液压挖掘机工作装置为例，通过提出的方法确定其动臂的铰点载荷，并将载荷反演结果作为动臂瞬态动力学分析的输入，计算得到基底测点和非基底应变仿真值，将实测值与仿真值进行对比分析，证明了提出方法的有效性...
When modelling automotive applications, the need to understand real world loading is imperative for proper simulations. Traditional approaches may use company standards or even MBD simulations. However, these approaches are at best approximations of the actual load conditions. If using an approximation of loading in a simulation, the results are only as accurate as the approximation. Companies often use experimental load transducers to measure real world loading. There are two major disadvantages with this approach. The first is that the load transducers often cannot measure all desired load inputs for a simulation. The second disadvantage is that the application of the load transducer forces physical modifications of the subject components. The measured loads may not be the actual loads because of the mass and stiffness changes to the subject components. Experimental Load Reconstruction is a non-invasive solution to this problem. The commercial True-Load® Load Reconstruction software will be demonstrated in this application. The unmodified trailer hitch is used in this application with only uniaxial strain gauges applied to the trailer hitch.