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This specification defines the requirements for A286 CRES T-bolts and eye bolts, with room temperature tensile strength of a minimum of 160000 psi, for use with clamps and V-band couplings at 1000 °F maximum ambient temperature.
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As demand for microcomponents has escalated in diverse areas of automotive, medicine, communications, electronics, optics, biotechnology, and avionics industries, there is a need for hybrid manufacturing techniques that can effectively micromachine hard and brittle materials. Electrochemical discharge machining (ECDM) is an advanced manufacturing process for machining difficult-to-cut materials. With a need for precision and accuracy, tool kinematics is a potential research area in ECDM for achieving geometrical dimensioning and tolerances (GD&T). Therefore, the present study reviews the ultrasonic vibration–assisted ECDM (UA-ECDM) hybrid process and the performance of its process parameters (voltage, electrolyte type and its concentration, electrode material, pulse duration, and amplitude) on the material removal rate (MRR), tool electrode wear (TEW), surface integrity, and difficult-to-cut materials. Also, the present work mentions current problems (debris and bubbles trapped
Prajapati, Mehul S.Lalwani, Devdas I.
To further improve the smoothness and robustness of lateral trajectory tracking for intelligent vehicles under complex operating conditions, this study proposes and experimentally validates a fuzzy adaptive dynamic model predictive control (FADMPC) strategy on the basis of model predictive control (MPC) framework. Thereinto, a three-degrees-of-freedom vehicle dynamics model serves as the predictive model, and a recursive least-squares algorithm with a forgetting factor is used to estimate tire cornering stiffness, thereby improving model fidelity. A whale optimization algorithm (WOA)–based adaptive horizon scheduler is devised to address the sensitivity of the prediction horizon to vehicle speed and road friction, and a fuzzy regulator adjusts the weight on the lateral displacement error in the objective function in real time. Hardware-in-the-loop tests on jointed and split-road surfaces show that compared with adaptive dynamic MPC, traditional MPC, and linear quadratic regulator, the
Teng, FeiJin, LiqiangWang, JunnianYang, ChenFan, JiapengQiu, NengLi, AndongZhou, Yanbo
The scope of this report will document the various voltage levels and provide a rationale for each level as discussed and agreed to in the AE-7 committee.
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The intent of this specification is for the procurement of the material listed on the QPL; therefore, no qualification or equivalency threshold values are provided. Users that intend to conduct a new material qualification or equivalency program must refer to the Quality Assurance section of the base specification, AMS6891.
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This specification establishes engineering requirements for electropolishing metallic parts and materials using Computer Aided Engineering simulation to reduce the process risks related to electropolishing.
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The scope of this report is to establish applicable definitions and terms prior to considering the application domain and use cases in HVDC applications. The report describes the specificities of the pyrotechnic actuator for use within a power-switching device with performances and main characteristics to consider for aerospace application.
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The intent of this specification is for the procurement of the material listed on the QPL; therefore, no qualification or equivalency threshold values are provided. Users that intend to conduct a new material qualification or equivalency program must refer to the Quality Assurance section of the base specification, AMS6891.
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The SAE J3211 procedure applies to squeal evaluation for foundation brakes using single-ended inertia dynamometers for friction couples used on vehicles with regenerative braking systems. This document applies to squeal noise occurrences for on-road passenger cars and light trucks with a gross vehicle weight rating of 4536 kg or below and with at least one rechargeable energy storage system as a source for propulsion. The procedure incorporates aspects related to (a) minimum inertia dynamometer capabilities, (b) fixture requirements and setup, and (c) test sequences with emphasis on brake temperatures, brake pressure profiles, and strategies to represent brake blending. For this document, squeal occurs when the peak noise level is at least 70 dB(A) between 1.25 and 16 kHz for tests using full suspension corners or complete axle assemblies, or between 2 and 16 kHz for brakes not using an entire suspension corner. Test facilities intending to use this document, building on their
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This SAE Recommended Practice was developed primarily for passenger car and truck applications but may be used in marine, industrial, and similar applications.
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This SAE Recommended Practice provides guidelines for the use, performance, installation, activation, and switching of marking lamps on Automated Driving System (ADS) equipped vehicles.
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This research paper proposes a framework based on lumped parameter thermal networks (LPTN) to understand the system behavior of thermally stressed component spaces in automotive vehicles. LPTNs offer an energy-based, low-degree-of-freedom model that can represent arbitrary thermal systems inside automotive vehicles. The time response of these low-order models can be calculated using standard ordinary differential equation solvers. The paper showcases the modeling of LPTNs and the calculation of their time response by using an electronic control unit (ECU) of a BMW 7 series. The use of LPTNs instead of exponential functions reduced the MAE in this example by 60.5%. Furthermore, a system identification approach for experimental temperature curves has been developed and implemented. System identification aims to mathematically model system behavior and predict system output. This paper compares least-square estimation (LSE) with constrained minimization (CM), where CM has a higher MAE by
Kehe, MaximilianEnke, WolframRottengruber, Hermann
2024–2025 Reviewers
Sandu, Corina
A passive control device to mitigate shock-induced separation in a generic supersonic inlet model is computationally studied. The simulations were based on the Favre-averaged Navier–Stokes equations with the Spalart–Allmaras (SA) turbulence model. The shockwave was generated by an 8° turn supersonic inlet. The Mach number in the inlet was varied between 2.1 and 2.46. The baseline shockwave/boundary layer interaction (SBLI) simulation results compare favorably with experimental data. The passive device, in the form of a splitter plate, eliminates both the separation and flow unsteadiness. The splitter plate causes reduction in the total pressure of the boundary layer at the exit of the inlet due to increased skin friction on the floor and due to wake of the plate.
Olcmen, SemihWahidi, RedhaHegde, AmruthkiranDatta, Narendra