Xinyu Zhang and Liling Ge
A multi-laser sensors-based measurement instrument is proposed for the measurement of geometry errors of a differential body and quality evaluation. This paper aims to discuss the…
Abstract
Purpose
A multi-laser sensors-based measurement instrument is proposed for the measurement of geometry errors of a differential body and quality evaluation. This paper aims to discuss the aforementioned idea.
Design/methodology/approach
First, the differential body is set on a rotation platform before measuring. Then one laser sensor called as “primary sensor”, is installed on the intern of the differential body. The spherical surface and four holes on the differential body are sampled by the primary sensor when the rotation platform rotates one revolution. Another sensor called as “secondary sensor”, is installed above to sample the external cylinder surface and the planar surface on the top of the differential body, and the external cylinder surface and the planar surface are high in manufacturing precision, which are used as datum surfaces to compute the errors caused by the motion of the rotation platform. Finally, the sampled points from the primary sensor are compensated to improve the measurement accuracy.
Findings
A multi-laser sensors-based measurement instrument is proposed for the measurement of geometry errors of a differential body. Based on the characteristics of the measurement data, a gradient image-based method is proposed to distinguish different objects from laser measurement data. A case study is presented to validate the measurement principle and data processing approach.
Research limitations/implications
The study investigates the possibility of correction of sensor data by the measurement results of multiple sensors to improving measurement accuracy. The proposed technique enables the error analysis and compensation by the geometric correlation relationship of various features on the measurand.
Originality/value
The proposed error compensation principle by using multiple sensors proved to be useful for the design of new measurement device for special part inspection. The proposed approach to describe the measuring data by image also is proved to be useful to simplify the measurement data processing.
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The purpose of this paper is to identify the critical components of a complex system by using survival signature. First, a complex system is abstracted with varying scales and…
Abstract
Purpose
The purpose of this paper is to identify the critical components of a complex system by using survival signature. First, a complex system is abstracted with varying scales and generates a multi-levels model. Then reliability evaluations can be conducted by survival signature from rough to fine for tracing and identifying them. Finally, the feasibility of the proposed approach is demonstrated by an actual production system.
Design/methodology/approach
The paper mainly applies a multi-level evaluating strategy for the reliability analysis of complex systems with components of multiple types. In addition, a multi-levels model of a complex system is constructed and survival signature also used for evaluation.
Findings
The proposed approach was demonstrated to be the feasibility by an actual production system that is used in the case study.
Research limitations/implications
The case study was performed on a system with simple network structure, but the proposed approach could be applied to systems with complex ones. However, the approach to generate the digraphs of abstraction levels for complex system has to be developed.
Practical implications
So far the approach has been used for the reliability analysis of a machining system. The approach that is proposed for the identification of critical components also can be applied to make maintenance decision.
Originality/value
The multi-level evaluating strategy that was proposed for reliability analysis and the identification of critical components of complex systems was a novel method, and it also can be applied as index to make maintenance planning.
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Reverse engineering methodology paves an efficient way for simulating and manufacturing existing objects with complex shapes, and a range of applications also has shown this…
Abstract
Reverse engineering methodology paves an efficient way for simulating and manufacturing existing objects with complex shapes, and a range of applications also has shown this approach to be feasible and efficient. However, in many applications, a lot of sub‐tasks in reverse engineering are usually not done in the same place, they need to be done cooperatively over the Internet or Intranet. So, this paper is concerned with developing a novel e‐service platform for remote service in reverse engineering applications based on mobile agent technology, and some correlative enabling technologies such as data compression, security considerations, agent models and so on. The framework was programmed using the Java Sevlets and Java Beans component models, and data transferring and processing were implemented based on the dispatch/retract mechanisms of mobile agents. The mobile agent is developed with IBM's Aglets Workbench, and the feasibility of the proposed method has been verified by a case.
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Jiehao Li, Shoukun Wang, Junzheng Wang, Jing Li, Jiangbo Zhao and Liling Ma
When it comes to the high accuracy autonomous motion of the mobile robot, it is challenging to effectively control the robot to follow the desired trajectory and transport the…
Abstract
Purpose
When it comes to the high accuracy autonomous motion of the mobile robot, it is challenging to effectively control the robot to follow the desired trajectory and transport the payload simultaneously, especially for the cloud robot system. In this paper, a flexible trajectory tracking control scheme is developed via iterative learning control to manage a distributed cloud robot (BIT-6NAZA) under the payload delivery scenarios.
Design/methodology/approach
Considering the relationship of six-wheeled independent steering in the BIT-6NAZA robot, an iterative learning controller is implemented for reliable trajectory tracking with the payload transportation. Meanwhile, the stability analysis of the system ensures the effective convergence of the algorithm.
Findings
Finally, to evaluate the developed method, some demonstrations, including the different motion models and tracking control, are presented both in simulation and experiment. It can achieve flexible tracking performance of the designed composite algorithm.
Originality/value
This paper provides a feasible method for the trajectory tracking control in the cloud robot system and simultaneously promotes the robot application in practical engineering.
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Salvador Antón i Clavé, Francisco López Palomeque, Manuel J. Marchena Gómez, Sevilla Vera Rebollo and J. Fernando Vera Rebollo
The Geography of Tourism in Spain is now at a par in terms of its scientific production with other European countries. Since the middle of the '80s the quality and volume of…
Abstract
The Geography of Tourism in Spain is now at a par in terms of its scientific production with other European countries. Since the middle of the '80s the quality and volume of contributions is analogous to the rest of the European Union, although as a part of University Geography in Spain it has not achieved the level of dedication reached by other subjects considering the importance of tourist activities to the economy, the society and the territory of Spain. It could be said that the Geography of Tourism in Spain is in the international vanguard in dealing with Mediterranean coastal tourism, with the relationships between the residential real estate and tourism sectors and with aspects related to tourism and leisure in rural and protected areas.
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D. Francis, J. Bessant and M. Hobday
For various reasons organisations can enter a condition that presents them with a “transformational imperative”. This happens when “old” ways of doing business cease to deliver…
Abstract
For various reasons organisations can enter a condition that presents them with a “transformational imperative”. This happens when “old” ways of doing business cease to deliver sustainable competitive advantage and usual ways of “putting things right” fail to restore business viability. In this article, we review ten companies that experienced at least one episode of a successful transformation. From cross‐case analysis we identify five competencies that appear to be common to successful transformations. We outline how organisations faced with a transformational imperative can build (often temporary) extraordinary management capabilities that facilitate multiple radical re‐shaping activities and enable them to undertake radical organisational transformation.
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This paper gives a review of the finite element techniques (FE) applied in the analysis and design of machine elements; bolts and screws, belts and chains, springs and dampers…
Abstract
This paper gives a review of the finite element techniques (FE) applied in the analysis and design of machine elements; bolts and screws, belts and chains, springs and dampers, brakes, gears, bearings, gaskets and seals are handled. The range of applications of finite elements on these subjects is extremely wide and cannot be presented in a single paper; therefore the aim of this paper is to give FE researchers/users only an encyclopaedic view of the different possibilities that exist today in the various fields mentioned above. An Appendix included at the end of the paper presents a bibliography on finite element applications in the analysis/design of machine elements for 1977‐1997.