The purpose of this study is to address the concept and the step-by-step procedure of a high-precision optical alignment test for spacecrafts using digital theodolites. The…
Abstract
Purpose
The purpose of this study is to address the concept and the step-by-step procedure of a high-precision optical alignment test for spacecrafts using digital theodolites. The proposed scheme focuses on the non-contact alignment qualification of spacecraft components during the integration and test phases until the launch event.
Design/methodology/approach
The proposed approach is based on the exploitation of the auto-collimation feature of theodolites and several prisms attached to the requested component and satellite configuration. As soon as the misalignment measurement including the difference between the real and desired attitude or position aberration of an instrument is made, the results must be transformed from the component level to the system level for misalignment error identification in the spacecraft dynamic model.
Findings
The paper introduces the main instruments, the defined coordinate systems and the architecture of the optical spacecraft misalignment test. Moreover, the guideline of the test implementation and the resulting data process have been presented carefully.
Research limitations/implications
There is no limitation associated with this method because the procedure is applicable for high-precision typical missions.
Practical implications
This paper describes a fully implementable scheme to examine any possible inaccuracy in mounting of the spacecraft components both in position and orientation. The test can be performed without the need for a huge budget or complicated hardwares.
Originality/value
The contribution of this work revolves around illustrating the context and procedure of the spacecraft misalignment test which has remained unknown in literature despite the frequent implementation in the different satellite projects.
Details
Keywords
Ali Kaveh, Hossein Akbari and Seyed Milad Hosseini
This paper aims to present a new physically inspired meta-heuristic algorithm, which is called Plasma Generation Optimization (PGO). To evaluate the performance and capability of…
Abstract
Purpose
This paper aims to present a new physically inspired meta-heuristic algorithm, which is called Plasma Generation Optimization (PGO). To evaluate the performance and capability of the proposed method in comparison to other optimization methods, two sets of test problems consisting of 13 constrained benchmark functions and 6 benchmark trusses are investigated numerically. The results indicate that the performance of the proposed method is competitive with other considered state-of-the-art optimization methods.
Design/methodology/approach
In this paper, a new physically-based metaheuristic algorithm called plasma generation optimization (PGO) algorithm is developed for solving constrained optimization problems. PGO is a population-based optimizer inspired by the process of plasma generation. In the proposed algorithm, each agent is considered as an electron. Movement of electrons and changing their energy levels are based on simulating excitation, de-excitation and ionization processes occurring through the plasma generation. In the proposed PGO, the global optimum is obtained when plasma is generated with the highest degree of ionization.
Findings
A new physically-based metaheuristic algorithm called the PGO algorithm is developed that is inspired from the process of plasma generation.
Originality/value
The results indicate that the performance of the proposed method is competitive with other state-of-the-art methods.
Details
Keywords
Hossein Mansouri, Saeed Sadeghi Boroujerdi, Michael Polonsky, Maizaitulaidawati Md Husin and Mehdi Seydi
This study examines the role of market orientation in the relationship between internal marketing and entrepreneurial orientation within private sports clubs.
Abstract
Purpose
This study examines the role of market orientation in the relationship between internal marketing and entrepreneurial orientation within private sports clubs.
Design/methodology/approach
The research is a descriptive-correlational study based on private sports clubs employees within Iran (Sanandaj). A theoretical model was developed based on the literature and tested using SPSS and PLS-SEM software.
Findings
The findings indicate a positive relationship between internal marketing and employees' entrepreneurial orientation. Market orientation has also played a positive mediating role in the relationship between internal marketing and entrepreneurial orientation.
Originality/value
The results suggest a higher level of market orientation in the organization can increase teamwork and, consequently, entrepreneurship development among employees. This is important in sports clubs as employees have a significant role in the success of the sports club. Club employees' satisfaction, generated through internal marketing, provides is a prerequisite for customer satisfaction. This therefore creates an environment supportive of entrepreneurial orientation in the club.