Zhipeng Wang, Zhiqin Qian, Ziye Song, Hongzhou Liu, Wenjun Zhang and Zhuming Bi
Even though multi-rotor aircrafts are becoming more and more prevalent in the fields of aerial photography, agricultural spraying, disaster searching and rescuing, how to achieve…
Abstract
Purpose
Even though multi-rotor aircrafts are becoming more and more prevalent in the fields of aerial photography, agricultural spraying, disaster searching and rescuing, how to achieve higher reliability and robustness of an aircraft still poses a big challenge. It is not a rare case that a multi-rotor aircraft is severely damaged or crushed when an actuator or sensor is malfunctioned. This paper aims at the resilience of an aircraft when a rotor is malfunctioned.
Design/methodology/approach
The reliability of a multi-rotor aircraft can be measured in terms of stability, robustness, resilience and fault tolerance. All of these four aspects are taken into consideration to improve overall reliability of aircrafts. When a rotor malfunction occurs, the control algorithm is cable of adjusting the operation conditions of the rest of rotors to achieve system stability.
Findings
In this paper, the authors first present a research topic on the development of a resilient multi-robot aircraft. A multi-rotor aircraft usually possesses more actuated motions than the required degrees of freedom.
Originality/value
The authors proposed to equip the multi-rotor aircraft with malfunction detecting sensors, and they developed the self-repairing algorithm to re-stabilize the aircraft when a malfunction of a rotor occurs. The design concept and methods were implemented on an eight-rotor aircraft, and the performance of the proposed instrumentation and self-repairing algorithm have been verified and validated.
Details
Keywords
Minling Chen, Ziye Tong and Jing Xue
Based on theories such as knowledge management and resource base, this paper explores the effect of knowledge domain coupling on R&D team innovation performance under the…
Abstract
Purpose
Based on theories such as knowledge management and resource base, this paper explores the effect of knowledge domain coupling on R&D team innovation performance under the perspective of technological innovation networks as well as the mediating role of digital transformation, and further validates the moderating role played by organizational innovation climate and environmental turbulence.
Design/methodology/approach
Taking the data of 239 Chinese enterprises with high R&D intensity and strong innovation ability as samples, SPSS and AMOS are used for empirical testing.
Findings
The findings suggest that knowledge domain coupling and its decomposition variables (complementary knowledge coupling and iterative knowledge coupling) have a significant positive effect on R&D team innovation performance, digital transformation partially mediates the relationship between knowledge domain coupling and R&D team innovation performance, and that there is a positive moderating effect of organizational innovation climate and environmental turbulence in the influence path.
Originality/value
The study has enlightening value for innovative enterprises and their R&D teams on how to effectively couple the knowledge, make reasonable use of iterative technologies and promote digital transformation practices to enhance innovation performance.
Details
Keywords
Wei Zhang, Shang Hao, Dandan Zhao, Guiqin Bai, Xin Zuo and Jiming Yao
This study aims to evaluate the thermal performance of phase change materials (PCMs) microcapsules (MCs) attached using SiO2 microspheres and investigate the thermal regulation…
Abstract
Purpose
This study aims to evaluate the thermal performance of phase change materials (PCMs) microcapsules (MCs) attached using SiO2 microspheres and investigate the thermal regulation effect on the coated denim fabric.
Design/methodology/approach
The PCM microcapsule was prepared by in situ polymerization using a mixture of solid paraffin and butyl stearate as core material (CM) and methyl methacrylate as a monomer. The SiO2 microparticles were attached to the outer layer of the membrane to enhance the thermal performance of MCs. The morphology, chemical structure, latent heat storage and thermal resistance of MCs were characterized. PCM MCs were coated on the denim fabric and thermo-gravimetric analysis was conducted; thermal insulation and thermal infrared imaging performance of the coated fabrics were also investigated.
Findings
The diameters of SiO2 particles and PCMs MCs were 300-500 nm and 1 μm, respectively. SiO2 was wrapped on single-wall PCMs MCs with the mass ratio of 1:5. With the addition of SiO2, the phase transition temperature range of MCs increased from 34°C to 39°C, and the endothermic and exothermic latent heat decreased by 5.35 J/g and 10.07 J/g, respectively. The degradation rate of MCs was significantly slowed down at high temperature. The denim fabric coated with MCs revealed thermal regulation property. After absorbing heat, the MCs slowed down the rate of heat loss and extended the heat release time.
Research limitations/implications
The phase transition temperature of the composite CM was wide, and the latent heat storage was reduced. The addition of SiO2 particles can significantly slow down the rate of heat loss, but it further reduces the latent heat storage performance.
Practical implications
The method developed provided a simple and practical solution to improve the thermal regulation performance of fabrics.
Originality/value
The method of adjusting the phase transition temperature range of the composite CM is novel and many applications could be found in preparation of PCMs and thermal management.