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Article
Publication date: 15 February 2021

Yongxing Guo, Min Chen, Li Xiong, Xinglin Zhou and Cong Li

The purpose of this study is to present the state of the art for fiber Bragg grating (FBG) acceleration sensing technologies from two aspects: the principle of the…

Abstract

Purpose

The purpose of this study is to present the state of the art for fiber Bragg grating (FBG) acceleration sensing technologies from two aspects: the principle of the measurement dimension and the principle of the sensing configuration. Some commercial sensors have also been introduced and future work in this field has also been discussed. This paper could provide an important reference for the research community.

Design/methodology/approach

This review is to present the state of the art for FBG acceleration sensing technologies from two aspects: the principle of the measurement dimension (one-dimension and multi-dimension) and the principle of the sensing configuration (beam type, radial vibration type, axial vibration type and other composite structures).

Findings

The current research on developing FBG acceleration sensors is mainly focused on the sensing method, the construction and design of the elastic structure and the design of a new information detection method. This paper hypothesizes that in the future, the following research trends will be strengthened: common single-mode fiber grating of the low cost and high utilization rate; high sensitivity and strength special fiber grating; multi-core fiber grating for measuring single-parameter multi-dimensional information or multi-parameter information; demodulating equipment of low cost, small volume and high sampling frequency.

Originality/value

The principle of the measurement dimension and principle of the sensing configuration for FBG acceleration sensors have been introduced, which could provide an important reference for the research community.

Details

Sensor Review, vol. 41 no. 1
Type: Research Article
ISSN: 0260-2288

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Article
Publication date: 29 September 2020

Piotr Wójcik, Krzysztof Obłój, Aleksandra Wąsowska and Szymon Wierciński

The purpose of this paper is to explore the emotional dynamics of the corporate acceleration process, using the systems psychodynamics perspective.

Abstract

Purpose

The purpose of this paper is to explore the emotional dynamics of the corporate acceleration process, using the systems psychodynamics perspective.

Design/methodology/approach

The study applies inductive multiple case study of embedded 10 cases of corporate acceleration, covering both incumbent and startup perspectives, occurring in the context of a corporate accelerator.

Findings

We find that (1) the process of corporate acceleration involves three phases, each of them is dominated by a different emotional state (hope, anxiety and acceptance), triggering different behavioral responses; (2) as a means to deal with negative emotions, entrepreneurs and corporate acceleration program's team members develop different mechanisms of dealing with contradictories in subsequent acceleration phases (defense and copying mechanisms), which are reflected in their behaviors. Coping mechanisms with goal reformulation (i.e. refocus from the officially declared “open innovation” goals toward mainly symbolic ones) is an effective strategy to manage negative emotions in third phase of the acceleration.

Research limitations/implications

Our sample is limited to two relatively similar accelerators established by telecom companies, and therefore, our theoretical and practical conclusions cannot be generalized.

Practical implications

We supplement the studies of corporate accelerators that imply how to design them better and improve decision-making rules with recommendation that in order to improve their effectiveness in terms of learning and innovations, their managers need not only to learn how to manage structural and procedural differences but also how to overcome social defenses triggered by corporate–startups cooperation.

Originality/value

By documenting a multidimensional impact of acceleration process, and especially shedding light on psychodynamic aspects behind such liaisons, this paper contributes to richer understanding of corporate–startup relationships, typically examined through a rationalistic lens of strategy literature. The study contributes to interorganizational research and open innovation literature, by showing that corporate acceleration process is marked by phases based on the type of emotions intertwined with the nature and dynamism of its life cycle. It indicates how these emotions are managed depending on their type.

Details

Journal of Organizational Change Management, vol. 33 no. 6
Type: Research Article
ISSN: 0953-4814

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Book part
Publication date: 17 September 2020

Lorenzo Skade, Sarah Stanske, Matthias Wenzel and Jochen Koch

Acceleration’, that is, the performance of activities in ever-shorter periods of time, is a distinctive feature of contemporary organizations and societies that is…

Abstract

Acceleration’, that is, the performance of activities in ever-shorter periods of time, is a distinctive feature of contemporary organizations and societies that is reflected in, and driven by startups’ attempts to scale up their businesses in ever-faster ways. Although prior research has highlighted that temporary organizing is a key way to accelerate the startup process, little is known about how actors do so. Based on a one-year ethnographic study at a startup accelerator, the authors explore how actors enact temporary organizing to attempt to accelerate the startup process. Their analysis shows that this process involves a plurality of partly conflicting temporal structures. As their study shows, such conflicts invoke tensions that actors live out in their daily activities. The authors identify three temporal practices – sequencing, freezing, and merging – through which actors engaged in temporary organizing enact acceleration in the startup process by reconciling these temporal structures. Their study has implications for understanding time in the expanding literature on temporary organizing and acceleration.

Details

Tensions and paradoxes in temporary organizing
Type: Book
ISBN: 978-1-83909-348-7

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Article
Publication date: 15 March 2020

Mehmet Konar

The purpose of this paper is to present a novel approach based on the artificial bee colony (ABC) algorithm aiming to achieve maximum acceleration and maximum endurance…

Abstract

Purpose

The purpose of this paper is to present a novel approach based on the artificial bee colony (ABC) algorithm aiming to achieve maximum acceleration and maximum endurance for morphing unmanned aerial vehicle (UAV) design.

Design/methodology/approach

Some of the most important issues in the design of UAV are the design of thrust system and determination of the endurance of the UAV. Although propeller selection is very important for the thrust system design, battery selection has the utmost importance for the determination of UAV endurance. In this study, the calculations of maximum acceleration and endurance required by ZANKA-II during the flight are considered simultaneously. For this purpose, a model based on the ABC algorithm is proposed for the morphing UAV design, aiming to achieve the maximum acceleration and endurance. In the proposed model, the propeller diameter, propeller pitch and battery values used in morphing UAV's power system design are selected as the input parameters; maximum acceleration and endurance are selected as the output parameters. To obtain the maximum acceleration and endurance, the optimum input parameters are determined through the ABC algorithm-based model.

Findings

Considerable improvements on maximum acceleration and endurance of morphing UAV with ABC algorithm-based model are obtained.

Research limitations/implications

The endurance and acceleration due to the thrust are two separate parameters that are not normally proportional to each other. In this study, optimization of UAV’s endurance and acceleration is considered with equal importance.

Practical implications

Using artificial intelligence techniques causes fast and simple optimization for determination of UAV’s endurance and acceleration with equal importance. In the simulation studies with ABC algorithm, satisfactory results are obtained.

Social implications

The results of the study have showed that the proposed approach could be an alternative method for UAV designers.

Originality/value

Providing a new and efficient method saves time and reduces cost in calculations of maximum acceleration and endurance of the UAV.

Details

Aircraft Engineering and Aerospace Technology, vol. 92 no. 4
Type: Research Article
ISSN: 1748-8842

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Article
Publication date: 9 September 2019

Diamanto Politis, Jonas Gabrielsson, Nataliya Galan and Solomon Akele Abebe

This study aims to better understand entrepreneurial learning in the context of venture acceleration programs.

Abstract

Purpose

This study aims to better understand entrepreneurial learning in the context of venture acceleration programs.

Design/methodology/approach

A qualitative research strategy was used based on multiple in-depth interviews with 21 lead entrepreneurs complemented with participatory observations and secondary sources. The data were inductively analysed following the Gioia methodology (Gioia et al., 2012).

Findings

The authors build on experiential learning theory to generate a process-focussed model exploring the learning dynamics that venture acceleration programs can facilitate. In this model, the authors identify three catalysts that trigger processes of experiential learning and two contingencies that alleviate the effects of the catalysts on learning outcomes. The findings suggest that the potential of venture acceleration programs to be effective learning environments pends on the presence and quality of these catalysts and contingencies.

Originality/value

The findings provide novel insights on how venture acceleration programs trigger entrepreneurial learning, thereby offering a deeper understanding of the learning dynamics in this setting.

Details

The Learning Organization, vol. 26 no. 6
Type: Research Article
ISSN: 0969-6474

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Article
Publication date: 16 March 2012

Elder M. Hemerly, Benedito C.O. Maciel, Anderson de P. Milhan and Valter R. Schad

The purpose of this paper is to employ an extended Kalman filter for implementing an AHRS (attitude and heading reference system) with acceleration compensation, thereby…

Abstract

Purpose

The purpose of this paper is to employ an extended Kalman filter for implementing an AHRS (attitude and heading reference system) with acceleration compensation, thereby improving the reliability of such systems, since this removes the usual restrictive assumption that the vehicle is undergoing a non‐accelerated maneuver.

Design/methodology/approach

MARG (magnetic, acceleration and rate gyros) sensors constitute the basic hardware, which are integrated by the Kalman filter. The error dynamics for attitude and gyro biases is obtained in the navigation frame, providing a much simpler approach than usually taken in the literature, since it relies on direct quaternion differentiation. The state vector associated to the error dynamics possesses six components: three are associated to the quaternion error and three concern gyro bias estimates.

Findings

The AHRS is implemented in an ARM (Advanced RISC Machine) processor and tested with experimental data. The accelerated case is treated by two complementary approaches: by changing the noise variance in the Kalman filter, and by obtaining an acceleration information from GPS (global positioning system) velocity measurements. Experimental results are presented and the performance is compared with commercial ARHS systems.

Practical implications

The proposed AHRS can be implemented with low cost MARG sensors, and GPS aiding, with use for instance in UAV (unmanned aerial vehicle) and small aircrafts' attitude estimation, for navigation and control applications.

Originality/value

Usually the AHRS designs employ as states total gyro bias and Euler angles, or quaternion, and do not consider the accelerated case. Here the state is comprised by gyro bias and quaternion error variables, which attenuates the effect of nonlinearities, and two complementary procedures tackle the accelerated case: acceleration correction by using a GPS derived acceleration signal and change in the output noise covariance used by the Kalman filter.

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Article
Publication date: 2 November 2015

Ivan Balic, Ante Mihanovic and Boris Trogrlic

The purpose of this paper is to present a new modification of the multimodal pushover method, named the target acceleration method. The target acceleration is the minimum…

Abstract

Purpose

The purpose of this paper is to present a new modification of the multimodal pushover method, named the target acceleration method. The target acceleration is the minimum acceleration of the base that leads to the ultimate limit state of the structure, i.e., the lowest seismic resistance.

Design/methodology/approach

A nonlinear numerical model is used to determine the target acceleration, which is achieved using the iterative procedure according to the envelope principle. Validation of the target acceleration method was conducted on the basis of the results obtained by incremental dynamic analysis.

Findings

The influence of higher modes is highly significant. The general failure vector corresponding to the target acceleration differs from the first load vector and the form of the load with uniform acceleration according to the height of structure, as contained in the European Standard EN 1998-1. Comparison between the target acceleration, including the equivalent structural damping, and the failure peak ground acceleration obtained from the dynamic response of the structure exhibits notably good agreement. This result implies that the equivalent structural damping as calculated according to the formulation presented in this paper should be greater than that suggested in the literature.

Originality/value

The originally developed procedure named multimodal pushover target acceleration method can reasonably estimate the minimum acceleration of the base that leads to the ultimate limit state of the structure, and consequently provides a reliable tool for the assessment of the lowest seismic resistance.

Details

Engineering Computations, vol. 32 no. 8
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 2 May 2017

Wenjing Zhu, Dexin Zhang, Jihe Wang and Xiaowei Shao

The purpose of this paper is to present a novel high-precision relative navigation method for tight formation-keeping based on thrust on-line identification.

Abstract

Purpose

The purpose of this paper is to present a novel high-precision relative navigation method for tight formation-keeping based on thrust on-line identification.

Design/methodology/approach

Considering that thrust acceleration cannot be measured directly, an on-line identification method of thrust acceleration is explored via the estimated acceleration of major space perturbation and the inter-satellite relative states obtained from space-borne acceleration sensors; then, an effective identification model is designed to reconstruct thrust acceleration. Based on the identified thrust acceleration, relative orbit dynamics for tight formation-keeping is established. Further, using global positioning system (GPS) measurement information, a modified extended Kalman filter (EKF) is suggested to obtain the inter-satellite relative position and relative velocity.

Findings

Compared with the normal EKF and the adaptive robust EKF, the proposed modified EKF has better estimation accuracy in radial and along-track directions because of accurate compensation of thrust acceleration. Meanwhile, high-precision relative navigation results depend on high-precision acceleration sensors. Finally, simulation studies on a chief-deputy formation flying control system are performed to verify the effectiveness and superiority of the proposed relative navigation algorithm.

Social implications

This paper provides a reference in solving the problem of high-precision relative navigation in tight formation-keeping application.

Originality/value

This paper proposes a novel on-line identification method for thrust acceleration and shows that thrust identification-based modified EKF is more efficient in relative navigation for tight formation-keeping.

Details

Aircraft Engineering and Aerospace Technology, vol. 89 no. 3
Type: Research Article
ISSN: 1748-8842

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Article
Publication date: 12 October 2015

Alan Whaley, Brodie McAdam and Paul Crowe

The aim of this paper is to explore the hypothesis that a contractor is entitled to payment for “constructive” acceleration implemented to avoid liquidated damages when…

Abstract

Purpose

The aim of this paper is to explore the hypothesis that a contractor is entitled to payment for “constructive” acceleration implemented to avoid liquidated damages when denied a warranted time extension request by the employer or certifier under an English law construction contract. This claim is recognised in the US legal system, but not elsewhere.

Design/methodology/approach

This paper adopts a “black letter” approach to reviewing the claim of constructive acceleration within the context of English and Commonwealth case law, from the perspective of a claimant contractor.

Findings

The research presented in this paper concludes that whilst claims for constructive acceleration are unlikely to succeed in an English court on the basis of US law, a claim might be supportable on more orthodox common law grounds. These include implied instructions under the contract, breach of the contract based on the employer or certifier’s failure to operate the contract, mitigation of damages, unjust enrichment and tortious intimidation.

Research limitations/implications

The focus of this paper is placed on English, Unites States, Canadian and Australasian case law.

Practical implications

The range of potential legal grounds for constructive acceleration examined in this paper provides a toolkit for practitioners preparing to make or defend constructive acceleration claims. This paper also bring more clarity to a potential legal problem faced by practitioners in circumstances of significant tension and limited time.

Originality/value

This paper provides a useful information source for practitioners faced with the prospect of advancing or defending constructive acceleration claims, and it provides a foundation for future related studies examining a wider scope of jurisdictions.

Details

International Journal of Law in the Built Environment, vol. 7 no. 3
Type: Research Article
ISSN: 1756-1450

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Article
Publication date: 11 April 2016

Anna Pluta and Aleksandra Rudawska

The purpose of this paper is to propose holistic approach to human resources in the situation of organizational acceleration. Authors are postulating that the holistic…

Abstract

Purpose

The purpose of this paper is to propose holistic approach to human resources in the situation of organizational acceleration. Authors are postulating that the holistic approach to HR helps in maintaining sustainable individual resources of employees in the situation of continuous organizational changes and time pressure that further can prevent from the individual resources exhaustion.

Design/methodology/approach

This conceptual paper builds on the problem of occupational stress that is connected with organizational acceleration. Authors define stress as the individually perceived inability to match expectations caused by the deficiency of individual resources. They conceptualize the individual resources of employees basing on the concepts of human capital and the individual energy at work and propose a framework of individual resources of employees that enables holistic view of an individual in an organization.

Findings

In the situation of organizational acceleration HRM function plays important role in sustaining individual resources of employees in order to minimize threat of occupational stress and further burnout. HR practices should apply multidimensionality of individual resources and threat it holistically aiming at sustaining all four potentials – spiritual, intellectual, emotional and physical.

Research limitations/implications

Authors indicate that managers need to understand how to deal with the acceleration in order to overcome the negative consequences for individuals. There is still need for identifying HR practices that are the key success factors in the situation of organizational acceleration.

Originality/value

Authors take up the current problem of organizational acceleration from the individual perspective. They propose a concept of individual resources of employees and connected to it holistic approach to HR in the times of great time pressure, work overload, occupational stress and burnout threat.

Details

Journal of Organizational Change Management, vol. 29 no. 2
Type: Research Article
ISSN: 0953-4814

Keywords

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