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Book

The Evolution of Automotive Technology: A Handbook, Second Edition
2023-05-17
The idea of "understanding the present through its history" is based on two insights. First, it helps to know where a technology comes from: what were its predecessors, how did they evolve as a result of the continuous efforts to solve theoretical and practical problems, who were crucial in their emergence, and which cultural differences made them develop into divergent families of artifacts? Second, and closely related to the first insight, how does a certain technology or system fit into its societal context, its culture of mobility, its engineering culture, its culture of car driving, its alternatives, its opponents? Only thus, by studying its prehistory and its socio-cultural context, can we acquire a true ‘grasp’ of a technology.
Standard

Brazing, Silver for Use up to 400 °F (204 °C)
2023-05-17
CURRENT
AMS2665J
This specification covers the engineering requirements for producing brazed joints in parts fabricated from steels, iron alloys, nickel alloys, cobalt alloys, and copper alloys by use of silver alloys, and the properties of such joints.
Journal Article

Design Optimization of Four-Layer Fraction Slot Concentrated Winding Spoke-Type Interior Permanent Magnetic Machine for Range Extender
2023-05-15
Abstract In this article, the design optimization of a four-layer fractional slot concentrated winding (FSCW) interior permanent magnet (IPM) machine for range extender is proposed for high energy efficiency and excellent torque/back-electromotive force (EMF) performance. The design starts with the comparison of four-layer FSCW patterns in terms of efficiency distribution based on a predesign spoke-type rotor model. Magnet segments and rotor auxiliary notches (ANs) are applied and optimized to reduce eddy current losses and torque ripples in the permanent magnets (PMs). Then, an efficient two-step optimization of multiple performances for a machine is presented. The rotor parameters are designed by an analytical model with a Pareto optimizer for torque capacity and ripple.
Technical Paper

A Generalized Multiobjective Metamodel-Based Online Optimization Method for Engine Development
2023-05-15
2023-01-5027
Further advancing key technologies requires the optimization of increasingly complex systems with strongly interacting parameters—like efficiency optimization in engine development for optimizing the use of energy. Systematic optimization approaches based on metamodels, so-called Metamodel-Based Design Optimization (MBDO), present one key solution to these demanding problems. Recent advanced methods either focus on Single-Objective Optimization (SoO) on local metamodels with online adaptivity or Multiobjective Optimization (MoO) on global metamodels with only limited adaptivity. In the scope of this work, a fully online adaptive (“in the loop”) optimization approach, capable of both SoO and MoO, is developed which automatically approximates the global system response and determines the (Pareto) optimum.
Technical Paper

Multiobjective Metamodel-Based Design Optimization—A Review and Classification Approach Using the Example of Engine Development
2023-05-15
2023-01-5026
To cope with increasing, challenging requirements and shorter development cycles, more complex, often nonlinear, systems with high interactions have to be optimized in many fields of research, such as the energy sector. As this often goes beyond the classical parameter studies-based approach, systematic optimization approaches offer a key solution. In the context of the development of energy converters, like engines, such techniques are applied to enhance efficiency and enable optimal use of energy. This review provides a comprehensive overview of the field of optimization approaches, more precisely referred to as Metamodel-Based Design Optimization (MBDO). The MBDO approaches essentially comprise three main modules: the Design of Experiment (DoE), the Response Surface Modeling (RSM), and the Multiobjective Optimization (MoO), in varying compositions.
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