Low-cost Design Method Research Articles

Experimental and numerical study on mechanical behavior of hybrid multi-cell structures under multi-crushing loads

Thin-walled multi-cell structures are the most typical protective structures owing to their excellent energy absorption characteristics. Hybrid multi-cell structures (HMSs), a combination of circular and polygonal cross sections, are proposed to take crashworthiness advantage of different cross-section thin-walled structures. Their mechanical behaviors under multi-crushing loads are investigated experimentally and numerically. The experimental results show that the HMS can experience stable folding deformation and effectively absorb energy under 10° oblique load. Furthermore, the numerical analysis finds that the load curves of HMSs with outer circular section have a more stable plateau stage than those of structures with outer polygonal section. In addition, the connecting position of ribs also has an important effect on the force and displacement response of the HMS. Therefore, the comprehensive crashworthiness of HMSs under multi-crushing loads is further evaluated by the grey relation analysis (GRA). The HMS consisted of the circular and hexagonal section is an optimal hybrid scheme. Furthermore, the hybrid structure that ribs connect the outer circular section and the midpoint of the inner hexagon’s edge (CHM) exhibits the best crashworthiness. Then, the crashworthiness of a bumper system with the CHM is further investigated to reveal the protective performance of the hybrid multi-cell design under frontal and oblique impact conditions. The results show that the protective performance of the CHM bumper system is better than that of the original bumper system. This study provides a highly efficient and low-cost design method to improve the energy absorption of the protective structures.

Compact N-Band Tree-Shaped Multiplexer-Based Antenna Structures for 5G/IoT Mobile Devices.

This paper presents a simple, compact and low-cost design method that allows one to obtain low-profile multi-band antennas for the overcrowded future generation networks, which are widely versatile and very heterogeneous in the K/Ka bands. The proposed antennas comprise n radiating monopoles, one for each of the desired operating frequencies, along with a frequency selective feeding network fed at a single point. This concept enables a single antenna to be shared with different radio-frequency (RF) frontends, potentially saving space. Typically, with n-band structures the biggest challenge is to make them highly efficient and here this is assured by multiplexing the frequency, and thus isolating each of the monopoles, allowing the design of scalable structures which fit the 5G applications. Based on the vision proposed here, a dual-band and a tri-band structures were built and characterized by their main parameters. Both prototypes achieved peak efficiencies around 80%, with adequate bandwidths and gains, as well as great compactness.

Low Cost Design Methods to Enhance Resolution and Dimensions for Printed Electrodes

Low Cost Design Methods to Enhance Resolution and Dimensions for Printed Electrodes

Research on Low-Cost Design Method of Offshore Platform DPS before Construction

In this paper a description is given about the implementation of the Dynamic positioning system in the Seabex (special model ship) software of ship. The effectiveness of DPS is confirmed by numerical simulation and tank test using a model ship. This research is an effective approach to design an offshore platform DPS at one-tenth of cost of conventional method.

The Elastic Analysis of the Construction with Non-linear Stiffness Property and its Application to the Design

The elastic performance brings an appropriate flexibility and a restoring force for installing and maintaining the routing arrangement of the control cable which is widely used as machine elements for transmitting load and displacement. On the other hand, the non-linear elastic performance has also made it difficult to design the control cable theoretically. In this study, we considered the method of the elastic analysis for the construction with non-linear stiffness property, such as a control cable and its application for the actual design. Then, we obtained following conclusions.(1) We developed the precise FEA model for the construction with various non-linear stiffness property.(2) We developed the method to predict the routing arrangement, the performance and the durability performance.(3) This developed simulation technology have been widely used in our company as the optimal and the low-cost design method in the early stage of vehicle's development.