Search results

The purpose of this paper is to develop a generalized observer and controller for brushless direct current (BLDC) motor to make the system more robust for parameter variations, load torque and speed tracking.

A robust interconnection and damping assignment passivity-based control (IDA-PBC) technique for BLDC motor is introduced in this paper. The IDA-PBC is used to obtain the reference voltages for pulse width modulation (PWM) control. The immersion and invariance (I&I) observer is used to estimate the load torque and speed of the BLDC motor. At the time of starting, the motor rotates in arbitrary direction, and sometimes, because of the cogging action, it may take a huge current. Therefore, a new start-up method is proposed for the BLDC motor, which maintains the alignment of the rotor.

From the simulation and experimental results, it can be seen that the proposed controller and observer satisfactorily work for parameter variations, load torque and speed tracking.

The authenticity of the proposed technique is tested experimentally on two different BLDC motors using low-cost 32-bit STM32F407VG microcontroller. The response of the proposed technique is evaluated by changing motor parameters such as stator resistance, inductance, flux linkage constant and torque constant.

Business Aviation (BA) is an important segment of nonscheduled air transport, providing personalized solutions for business trips by air. Unlike scheduled air transport or holiday charters, BA has hardly been dealt with in the academic literature. This chapter gives insight into the structure and key economic effects of the European (EU28 + EFTA) BA sector. Hereby, we differentiate between the sector’s macroeconomic footprint, in terms of jobs or gross value added (GVA), and the generation of business efficiencies and connectivity benefits for the users. Based on our own data collection and input-output analyses using data from the World Input-Output Database and Eurostat, we find that the effect of BA over the EU28 GVA is almost 0.2%. Also, some 374,000 European jobs are directly or indirectly dependent on the sector’s activities, which is more than the total number of jobs in, e.g., Cyprus. More than half of these jobs stem from the operation of business aircraft and from closely related operational services like maintenance (“MRO”) and handling (“FBO”), while the remaining employment occurs in the production of business aircraft and parts. Comparing actual European BA flights against their fastest commercial travel alternatives, key efficiencies came to light, such as average travel time savings of 127 minutes per flight, annual savings of about € 15 million in overnight hotel costs and an average 150% increase in productive work time for the travelers. Furthermore, we find that BA can significantly improve connectivity, as it serves about 25,000 city pairs not connected by nonstop scheduled air services.

The case collates secondary data pertaining to Maruti’s current position, Nexa, the premium retail sales channel of Maruti, and recent developments in the Indian automobile industry. It presents the facts and data published on websites, newspapers and magazines in the form of a case study.

Nexa was launched by Maruti in 2015 to enhance the buying experience of its premium customers and to re-position itself as a premium brand. It started offering customized services to car purchasers through its well-trained employees, attractive store environment and omni channel experience. Through all these facilities, though Nexa had a bumpy ride for selling its first product, it managed to pace up and perform better in the next few years. It remained to be seen how Maruti would handle competitor and cost challenges and how it would strategize its efforts to strengthen its footprint in the Indian automotive industry.

This case can be used in retail management, sales and distribution management, marketing management and related courses/modules at the master’s level.

Structural equation modeling was conducted, and a sample with 577 consumers was investigated.

Based on the stimulus–organism–response (SOR) model, this study aims to explore how channel integration affects usage intention through perceived value in food delivery platform (FDP) services. Moreover, the author also examines the moderating effects of personal innovativeness and experience on the relationships in the model.

The study found that channel integration affects usage intention through perceived usefulness, perceived enjoyment and perceived price. Moreover, the moderating effects of personal innovativeness and experience are both significant in the model.

This study found that perceived usefulness, perceived enjoyment and perceived price are three major values influencing the relationship between channel integration and usage intention in FDP services. Moreover, for consumers with high personal innovativeness, perceived usefulness, perceived enjoyment, social image and perceived risk affecting usage intention will be weaker than for consumers with low personal innovativeness. However, for highly experienced consumers, perceived usefulness, perceived enjoyment and perceived price affecting usage intention will be stronger than for less experienced consumers.

This study suggests that practitioners should develop value-driven innovative services and activities by integrating various channels for customers. Moreover, they should segment consumers on the basis of different levels of personal innovativeness and experience to provide different strategies for increasing the intention to use the service.

This study advances the extant knowledge of the SOR model in the context of online-to-offline commerce.

The quality of construction projects is mainly dependent on the process quality during the construction phase than product quality. The key factors that influence the process quality of building projects in Pakistan during the construction phase of building life cycle are evaluated from literature. This paper aims to discuss these issues.

The factors were ranked using the traditional relative importance index (RII) and the second synthetic grey relational analysis method. The findings indicate that during the construction phase the selection of an appropriate contractor is the most important factor. The existence of feedback system and quality of shop drawings received from subcontractors are also very significant factors, according to the grey relational model.

Measures for the improvement of process quality in Pakistan are suggested. The results from both methods are not entirely comparable; however, if one considers uncertainty in data, then the second synthetic GRA-based ranking should be preferred over RII in decision making.

The study is pioneer in the evaluation of key factors influencing process quality during building construction projects in Pakistan using a set of traditional and novel methods. The results of this study are significant in improving the process quality during different phases of construction.