Step Change Research Articles

Digital Twins in Agriculture: Orchestration and Applications.

Digital Twins have emerged as an outstanding opportunity for precision farming, digitally replicating in real-time the functionalities of objects and plants. A virtual replica of the crop, including key agronomic development aspects such as irrigation, optimal fertilization strategies, and pest management, can support decision-making and a step change in farm management, increasing overall sustainability and direct water, fertilizer, and pesticide savings. In this review, Digital Twin technology is critically reviewed and framed in the context of recent advances in precision agriculture and Agriculture 4.0. The review is organized for each step of agricultural lifecycle, edaphic, phytotechnologic, postharvest, and farm infrastructure, with supporting case studies demonstrating direct benefits for agriculture production and supply chain considering both benefits and limitations of such an approach. Challenges and limitations are disclosed regarding the complexity of managing such an amount of data and a multitude of (often) simultaneous operations and supports.

Reducing false damage detections in guided ultrasonic wave monitoring systems using a denoising autoencoder

ABSTRACT Guided ultrasonic wave (GUW) monitoring systems for pipeline structures are gaining much attention in critical sectors such as the petrochemical, nuclear and energy sectors. However, the effects of environmental and operational conditions (EOCs), especially temperature, may generate substantial false damage detections. The temperature effect may interfere with different coherent noise sources and generate unwanted peaks that are falsely identified as damage. In this paper, a denoising autoencoder (DAE) is proposed to reduce the frequency of false damage detections in GUW monitoring systems. A DAE decodes high dimensional data into low-dimensional features and reconstructs the original data from these low-dimensional features. By providing signals at a reference temperature with the fewest false damage detections, this structure forces the DAE to learn the essential features hidden within complex data. A database of GUW signals is formed based on the experimental measurements using a six-metre-long stainless steel Schedule 20 pipe. Variations in temperature and damage severity are applied to develop the database to mimic a simple step change in damage growth under EOCs. The outcomes obtained from this study show that the proposed methodology can reduce false damage detections during GUW monitoring and is valuable for pipeline safety evaluations.

PHYSICAL ACTIVITY AND MENTAL HEALTH IN AUSTRALIAN ADULTS WITH PSYCHOLOGICAL DISTRESS

INTRODUCTION & AIMS Adults with mental health concerns face compounded barriers to physical activity engagement. We recently conducted a randomised controlled trial to determine whether a lifestyle intervention targeting PA and nutrition was non-inferior to psychotherapy in managing depression (the CALM non-inferiority trial). While we demonstrated non-inferiority, participants assigned to the lifestyle intervention demonstrated improvements in dietary adherence and intake but not self-reported activity measures. The aim of this sub-study was to analyse actigraphy-derived measures to identify whether objective changes occurred and determine whether these were associated with mental health. METHODS This study included a sub-set of 36 of the 70 participants assigned to the lifestyle therapy intervention from the larger trial (ACTRN12621000387820) who were recruited based on indicative depression (Distress Questionnaire Scale 8+). A Fitbit Charge-2 measured daily steps (n), distance travelled (km), floors climbed (n) and minutes in sedentary, light, moderate and vigorous activity. Questionnaires measured psychological distress (Kessler-10), anxiety (Generalised Anxiety Disorder scale-7) and depressive symptoms (Patient Health Questionnaire-9). Linear mixed models determined within-group change over time. Spearman rank correlation coefficients examined associations between change scores over 8-weeks. RESULTS From baseline to 8-week follow-up, floors climbed increased 38% (mean change [95%CI]: 2.8 [0.0, 5.5], P=0.047) and minutes sedentary increased 9% (66.9 [20.8, 133.0], P=0.004). We found no change in daily steps, distance travelled, or minutes spent lightly, moderately, or vigorously active. Reducing sedentary time was associated with reduced depressive symptoms (rs=0.350, P=0.043), similarly increasing time spent in vigorous activity was associated with reduced psychological distress (rs=0.346, P=0.045). CONCLUSION Changes in activity were mixed, however vigorous physical activity and reduced sedentary time were associated with improved mental health in adults with psychological distress participating in a lifestyle therapy intervention for depression. Future investigations should seek to quantify minimum changes required to benefit mental health in this vulnerable population.

Decarbonisation of high-temperature endothermic chemical reaction processes using a novel turbomachine: robustness of the concept to feed variability

This paper presents a revolutionary turbomachinery concept, referred to as the turbo-reactor, which has the potential to replace gas-fired radiant furnaces and decarbonise a wide range of hard-to-abate, high-temperature endothermic chemical reaction processes. Although previous studies by the authors have confirmed the feasibility of using a turbo-reactor for steam cracking reactions, the numerical investigation presented in this work broadens the scope of potential applications for the machine to a variety of energy-intensive chemical processes, including those used for hydrogen production. This step change in technology could be the catalyst needed to enable rapid scale-up of low-carbon hydrogen technology. The innovative design of the turbo-reactor is fundamentally based on converting all of the imparted mechanical energy into internal energy, rather than pressure. This enables temperatures of up to 1,700°C to be achieved within an axial length on the order of one metre, resulting in an increase in the power density of 50 to 1,000 times compared to a surface heat exchanger. This paper presents the first comprehensive analysis of the turbo-reactor’s robustness and controllability across a broad spectrum of feeds, chemical reaction stages, Mach number regimes, and operating points, conclusively demonstrating the feasibility of a universal stage design strategy for repeatedly imparting and dissipating energy for various endothermic reaction processes.

Investigation on the reaction mechanism and stability of Ruddlesden-Popper structure Srn+1BnO3n+1 (B=Ru, Ir, n=1, 2) as an oxygen evolution reaction electrocatalyst in acidic medium

R–P structured catalysts have attracted attention due to their low noble metal content and long-term stability. In this paper, we calculated the synthesis difficulty, Sr segregation, and OER catalytic activity of SrBO3, Srn+1BnO3n+1 (BRu, Ir, n = 1, 2), taking into account the effects of perovskite layer numbers and strain. The synthesis difficulty was calculated: SrBO3 < Sr2BO4 < Sr3B2O7. The perovskite layer numbers of R–P catalysts were also found to affect the OER process, from n = 1 to 2, the rate-controlling step changes from O*→OOH* to OOH*→O2. Sr2IrO4 was calculated to have the best catalytic activity but is very prone to Sr segregation. Due to the unique layered nature, Sr2IrO4 is still considered the most promising OER catalyst. Furthermore, we also concluded that applying strain impairs the OER catalytic performance of R–P oxides. Our work investigated the OER catalytic mechanisms of R–P oxides, which is significant for the development of water electrolysis.

Optimization of BLDC-based electric vehicles: vehicle dynamics modelling through dual-motor approach and designing a novel augmented TLBO algorithm for PID control

Abstract Sample The work primarily focuses on increasing the efficiency of EV drive in electric two-wheeler by working on several aspects, such as modulating the vehicle's design, optimizing the control strategy, and increasing the speed range using a dual-motor approach. The dynamics of electric two-wheeler have been discussed with a mathematical vehicle model and further tuning of several aspects. Besides, this paper also introduces a novel Augmented Teaching and Learning based Optimization (ATLBO) technique designed exclusively to control BLDC motors for the electric two-wheeler vehicle. Besides, the designed technique has been implemented for the widely used commercial e-bike of Hero Company. Therefore, an analysis has been performed to increase the vehicle's speed range using a dual motor, from 45 km/hr to 62 km/hr, proving to be a viable alternative to a single motor generally used in an electric bike. ATLBO technique has been designed against a conventional TLBO to optimize the proportional-integral-derivative (PID) controller for the speed control of a linear brushless DC (BLDC) motor. Furthermore, the literature has validated the merits of the presented novel control technique. The only disadvantage of using a dual motor is the initial cost, but the overall cost is moderated in the long-term usage for its augmented performance parameters. The performance parameters of the above technique are analyzed against other optimization techniques like conventional Teaching and Learning based optimization (TLBO), Particle Swarm Optimization (PSO). MATLAB/Simulink models the brushless DC motor and implements ATLBO, TLBO, and PSO algorithms. It has been found that the response obtained from ATLBO is comparatively much faster than other optimization techniques, which supports the motor for quick acceleration as well as more efficient in improving the step response characteristics such as rise time, settling time, and steady-state error in the speed control of a linear BLDC motor.&amp;#xD;

UKIMA as red flag symptom of constitutional ill-health: devolved autonomy and legislative consent

Devolution is a fundamental principle of the United Kingdom (UK) constitution – a ‘new settlement’, as Tony Blair put it, that at once responded to the democratic demand to ‘[bring] decision-making … closer to the people who felt a strong sense of identity’ and also, in so doing, ‘to ward off the bigger threat of secession’. At the heart of that principle is respect for devolved autonomy; that, within the devolved sphere, it is the devolved authorities who are best placed to wield primary and secondary law-making powers free from interference from the centre. The constitutional safeguard for devolved autonomy is a political rule: that the UK Parliament will not normally legislate with regard to devolved matters without the consent of the relevant devolved legislature(s). Until the process to withdraw the UK from the European Union (EU) began, the convention was well defined, well understood and well respected. However, the UK Government’s centripetal approach to EU withdrawal and to the resulting realignment of the UK constitution has marked a significant step change. In this article I take seriously the claim made by the Institute for Government that the UK Internal Market Act 2020 is the most contentious example – a red flag symptom – of damaging new constitutional dynamics: the increased willingness of the UK Parliament and UK Government to intervene in devolved matters without devolved consent. At stake as a result is not only the efficient operation of the UK internal market but, recalling Blair, the very survival of the union itself.

Characteristics of Unsuccessful Balance Reactive Responses to Lateral Loss of Balance in Older Adults.

An effective reactive step response to an unexpected balance loss is an important factor that determines if a fall will happen. We investigated reactive step strategies and kinematics of unsuccessful balance recovery responses that ended with falls in older adults. We compared the strategies and kinematics of reactive stepping after a lateral loss of balance, i.e., perturbations, between 49 older female adults who were able to successfully recover from perturbations (perturbation-related non-fallers, PNFs) and 10 female older adults who failed to recover (perturbation-related fallers, PFs). In addition, we compared the successful versus unsuccessful recovery responses of PFs matched to perturbation magnitude. The kinematics of the first reactive step response were significantly different between PFs and PNFs, i.e., longer initiation time, step time, swing time, and time to peak swing-leg velocity, larger first-step length, and center of mass displacement. Incomplete crossover stepping and leg collision were significant causes of falls among PFs. Similar findings were found when we compared the successful versus unsuccessful recovery responses of PFs. The crossover step, which requires a complex coordinated leg movement, resulted in difficulty in controlling and decelerating the moving center of mass following a lateral perturbation, affecting the kinematics of the stepping response, leading to a fall.

Molecular Heterogeneity in Leiomyosarcoma and Implications for Personalised Medicine.

Leiomyosarcoma (LMS) is one of the more common subtypes of soft tissue sarcomas (STS), accounting for about 20% of cases. Differences in anatomical location, risk of recurrence and histomorphological variants contribute to the substantial clinical heterogeneity in survival outcomes and therapy responses observed in patients. There is therefore a need to move away from the current one-size-fits-all treatment approach towards a personalised strategy tailored for individual patients. Over the past decade, tissue profiling studies have revealed key genomic features and an additional layer of molecular heterogeneity among patients, with potential utility for optimal risk stratification and biomarker-matched therapies. Furthermore, recent studies investigating intratumour heterogeneity and tumour evolution patterns in LMS suggest some key features that may need to be taken into consideration when designing treatment strategies and clinical trials. Moving forward, national and international collaborative efforts to aggregate expertise, data, resources and tools are needed to achieve a step change in improving patient survival outcomes in this disease of unmet need.

Model refinements with experimental validation in piezoelectric plate actuators

The axisymmetric vibration analysis of circular plates with piezoelectric layers and step changes in plate thickness is conducted. For the chosen configurations, it is necessary to solve a coupled system of differential equations for extensional and flexural vibration to obtain accurate modal results. The adopted computational approach is based upon the classical transfer matrix method. Instead of employing analytical solutions in the form of e.g. Bessel functions, matrix exponentials of the system matrix are directly computed in the transfer matrices for finding highly accurate solutions. The developed approach has enabled the complete quantitative modal analysis in piezoelectric actuators. The procedure is firstly verified against available analytical results for natural frequencies and modes shapes in circular homogeneous plates, and by using finite element simulations for plates with asymmetric step changes in thickness. Ultimately, the developed approach is validated against experimental results of relevance to applications in piezoelectric synthetic jet actuation. The obtained numerical results for modal parameters and frequency response functions are in excellent agreement with the available analytical results, and with previous and newly presented in the paper experimental data, when considering the inherent uncertainty in parameter values. Based on extensive experimental results, realistic damping is introduced in the model of piezoelectric plate actuators. Importantly, it is shown that solutions of high accuracy can be obtained by a more general coordinate system than that traditionally linked to the plate neutral plane(s).

Dynamic behaviour and performance evaluation of a biomass-fired organic Rankine cycle combined heat and power (ORC-CHP) system under different control strategies

The dynamic behaviour and performance evaluation of a biomass-fired organic Rankine cycle combined heat and power (ORC-CHP) system under two different control strategies are investigated in this study. The dynamic model is established, while the dynamic characteristics of key operating parameters (superheat degree, evaporating pressure and mass flow rate) with the step change of heat source temperature are examined. The effects of controlled superheat degree and controlled expander shaft work on dynamic behaviours of thermodynamic, economic and environmental performance are discussed and compared under different control methods (feedforward active control, PID passive control and combined control). Results indicate that the superheat degree is significantly influenced by the heat source temperature under the without control strategy, with the variation reaching 8.4 K. The combined control method exhibits the best control performance with overshoot and control response times of 1.2 K and 12.3 s, respectively. Compared to without control, the expander shaft work and ORC thermal efficiency of the control strategy of superheat degree increase by 3.2 kW and 0.8 %, while that of the control strategy of expander shaft work increase by 1.0 kW and 0.3 %, respectively. The control strategy of superheat degree presents a significant improvement in the economic and environmental performance of the biomass-fired ORC-CHP system. This study is expected to provide better guidance for the practical operation and control of biomass-fired ORC-CHP systems.

“I never planned for it”—Exploration of expectations about caring for older parents

AbstractThe projected increase in older dependent adults will continue straining formal care services whilst increasing the reliance on unpaid carers, in England and internationally. While motivations and willingness to care among unpaid carers have been explored, expectations around the caregiving role remain under‐researched. This article delves into expectations of middle‐aged individuals around providing care to an older parent in the future. Data collected through six focus groups with 35 mid‐life individuals, a mix of individuals with and without caring experience, were analysed thematically, cross‐sectionally, and with reference to different phases in the caregiving trajectory. Participants showed predicted, in some cases normative, expectations about taking on the role of carer for an older parent. Such expectations were rooted in emotional and socio‐cultural factors and influenced how people self‐identified as a carer. Expectations about what the role would entail were unformed: they were described as conditional on the uncertain and changing care needs of the older parents (‘caregiving creep’). Those with caring experience highlighted that, in hindsight, their prior expectations did not match their actual experience of the role, requiring greater time commitment and impacting their life in ways they had not anticipated. When thinking about the future, participants envisaged stepped changes in care arrangements to meet increasing, albeit uncertain, care needs, but acknowledged their lack of awareness around the care options available to them. Policies aiming to improve general awareness about caregiving, support early identification of carers, and address their information need throughout their caregiving journey should be a priority.

Microstructural characterisation and compound formation in rapidly solidified SiGe alloy

Severe Ge segregation to grain boundaries was observed in a Si–14.2 at% Ge thermoelectric alloy rapidly solidified using a drop-tube facility, manifesting itself as a series of regions with uniform stoichiometric compositions. The step change in composition at the interface between adjacent regions was ascribed to the formation of different SiGe pseudocompounds and contradicted the accepted thermodynamic description of the SiGe system as a continuous random solid solution. Rapid solidification increased, rather than decreased, the inhomogeneity degree of the solid product, and the Ge content of the most Ge-rich regions was positively correlated with the cooling rate, which suggested the absence of solute trapping. The transmission electron microscopy/selected area electron diffraction analysis of the most Ge-rich regions revealed superlattice spots indicative of chemical ordering. However, simple chemical ordering within a single diamond cubic unit cell could not explain the fact that most stoichiometries had compositions that were multiples of 5 at% Ge, which indicated the presence of superstructural ordering.

Characteristics and Consequences of Falls in People Who Use Wheelchairs in Long-Term Care Settings

ObjectivesThe purpose of this study was to understand the characteristics and consequences of falls in individuals using wheelchairs in long-term care settings. DesignObservational analysis of real-world falls in long-term care. Setting and ParticipantsResidents using wheelchairs from 2 long-term care facilities in British Columbia, Canada (n = 32 participants, mean age = 84.7 years, 12 women). MethodsTwo raters used the validated Falls Video Analysis Questionnaire, adapted from the original version, to assess the causal, behavioral, and environmental aspects of falls from wheelchairs. ResultsA total of 58 wheelchair fall videos were identified out of 300 total videos that were collected from 2007 to 2014. Wheelchair falls were most often caused by incorrect transfer or shift of body weight (70.7%). Participants most often fell backward with 89.7% striking their pelvis. Individuals using wheelchairs had limited protective response, with only 10.3% demonstrating a step response. Improper brake position contributed to 67.2% of falls. No serious fall-related injuries were reported. Conclusions and ImplicationsThe findings highlight the unique nature of falls in older adults who use wheelchairs in long-term care settings. Overall, the results of this study support clinical practice and the critical need for developing specialized fall prevention and fall detection interventions for individuals who use wheelchairs in long-term care.

Microbe and bioprocess performances for sustainable production of biobased 2,3-butanediol in a sugarcane biorefinery; a technoeconomic and environmental analysis

AbstractIndustrial production of bio-based 2,3-butanediol via microbial conversion of sugars is intended to provide viable investment opportunities accompanied by reduced greenhouse gas emissions, compared to current fossil-based products. The potential impacts on the product minimum selling price and life cycle greenhouse gas emissions of further technology developments resulting in enhanced product yield, volumetric productivity and/or titres were assessed though a 33 full-factorial design. Aspen Plus® was employed to simulate multiple scenarios for 2,3-butanediol production from A-molasses in a biorefinery annexed to an existing sugarcane mill for subsequent techno-economic analysis. A 10% singular improvement in product yield, titre and volumetric productivity reduced the minimum selling price by 3.6%, 1.4% and 0.1%, whereas titre improvements reduced greenhouse gas emissions twice as much as product yield for a 10% step change. At the current state of technology, biobased 2,3-butanediol can achieve the minimum performance required to be a feasible alternative to fossil-based 2,3-butanediol with an estimated best minimum selling price of 1434$ t−12,3-BDO and greenhouse gas emissions 6.5 times less than those recorded for fossil-derived 1,4-butanediol. The minimum selling price and greenhouse gas emissions values can be reduced further by at least 16% and 14%, respectively, warranting further investment in strain and bioprocess performance enhancement. Overall, the research demonstrated that technological efforts intended to enhance the viability of biobased 2,3-butanediol production also minimized greenhouse gas emissions, integrating environmental and economic objectives for a sustainable bioeconomy. Graphical abstract

Interlaboratory study of the operational stability of automated sorption balances

AbstractAutomated sorption balances are widely used for characterizing the interaction of water vapor with hygroscopic materials. These instruments provide an efficient way to collect sorption isotherm data and kinetic data. A typical method for defining equilibrium after a step change in relative humidity (RH) is using a particular threshold value for the rate of change in mass with time. Recent studies indicate that commonly used threshold values yield substantial errors and that further measurements are needed at extended hold times as a basis to assess the accuracy of abbreviated equilibration criteria. However, the mass measurement accuracy at extended times depends on the operational stability of the instrument. Published data on the stability of automated sorption balances are rare. An interlaboratory study was undertaken to investigate equilibration criteria for automated sorption balances. This paper focuses on the mass, temperature, and RH stability and includes data from 25 laboratories throughout the world. An initial target for instrument mass stability was met on the first attempt in many cases, but several instruments were found to have unexpectedly large instabilities. The sources of these instabilities were investigated and greatly reduced. This paper highlights the importance of verifying operational mass stability of automated sorption balances, gives a method to perform stability checks, and provides guidance on identifying and correcting common sources of mass instability.

Design and Analysis Models with PID and PID Fuzzy Controllers for Six-Phase Drive

Due to their reliability, design and analysis models with PID and PID fuzzy controllers for six-phase drive are being applied in new areas in various industries, including transportation. First, the development of any system with multiphase motors requires an elaborate model to define the control mode and controllers. The modeling of a control system for six-phase drive is based on its conventional d-q mathematical model and indirect field-oriented control. In this study, a Simulink six-phase drive model is designed with indirect field-oriented control and simulated with two types of fuzzy controller, PID and PID fuzzy. The simulation results are presented and analyzed; these results reflect the step response and performance at the provided speed reference law while keeping the load application at a constant speed. A fuzzy controller with 49 rules is considered and applied. With field-oriented control and a well-tuned PID controller, the six-phase electric drive has good step response specifications: a short settling time when starting without a load, no overshoot in the step response, small size, and a slight decrease in speed when loaded. The system employing a PID fuzzy controller shows slightly better results in response to the application of torque: the decrease in speed is eliminated more quickly. The simulation results were tabulated with the PID and with the results of previous research that rearranged some models to only operate in the classical controller mode. The simulation results indicate the robustness to disturbance of both the systems with six-phase drive and provide high-quality transient specifications at the provided reference speed.

Rapid time-domain simulation of fractional capacitors with SPICE

AbstractFractional capacitors, commonly called constant-phase elements or CPEs, are used in modeling and control applications, for example, for rechargeable batteries. Unfortunately, they are not natively supported in the well-used circuit simulator SPICE. This manuscript presents and demonstrates a modeling approach that allows users to incorporate these elements in circuits and model the response in the time domain. The novelty is that we implement for the first time a particular configuration of RC elements in parallel in a Foster-type network with SPICE in order to simulate a constant-phase element across a defined frequency range. We demonstrate that the circuit produces the required impedance spectrum in the frequency domain, and shows a power-law voltage response to a step change in current in the time domain, consistent with theory, and is able to reproduce the experimental voltage response to a complicated current profile in the time domain. The error depends on the chosen frequency limits and the number of RC branches, in addition to very small SPICE numerical errors. We are able to define an optimum circuit description that minimizes error while maintaining a short computation time. The scientific value is that the work permits rapid and accurate evaluation of the response of CPEs in the time domain, faster than other methods, using open source tools.

Effect of Gamification, Financial Incentives, or Both to Increase Physical Activity Among Patients at High Risk of Cardiovascular Events: The BE ACTIVE Randomized Controlled Trial.

Physical activity is associated with a lower risk of major adverse cardiovascular events, but few individuals achieve guideline recommended levels of physical activity. Strategies informed by behavioral economics increase physical activity, but their longer-term effectiveness is uncertain. We sought to determine the effect of behaviorally-designed gamification, loss-framed financial incentives, or the combination on physical activity compared with attention control over 12-month intervention and 6-month post-intervention follow-up periods. Between May 2019 and January 2024, participants with clinical ASCVD or 10-year risk of myocardial infarction, stroke, or cardiovascular death ≥ 7.5% by the pooled cohort equation were enrolled in a pragmatic randomized clinical trial. Participants received a wearable device to track daily steps, established a baseline, selected a step goal increase, and were randomly assigned to control (n = 151), behaviorally-designed gamification (n = 304), loss-framed financial incentives (n = 302), or gamification + financial incentives (n = 305). The trial's primary outcome was change in mean daily steps from baseline through the 12-month intervention period. A total of 1062 patients (mean [SD] age 67 [8], 61% female, 31% non-white) were enrolled. Compared with controls, participants had significantly greater increases in mean daily steps from baseline during the 12-month intervention in the gamification arm (adjusted difference, 538.0; 95% CI, 186.2-889.9; P = 0.0027), financial incentives arm (adjusted difference, 491.8; 95% CI, 139.6-844.1; P = 0.0062), and gamification + financial incentives arm (adjusted difference, 868.0; 95% CI, 516.3-1219.7; P < 0.0001). During 6-month follow-up, physical activity remained significantly greater in the gamification + financial incentives arm than in the control arm (adjusted difference, 576.2; 95% CI, 198.5-954; P = 0.0028) but was not significantly greater in the gamification (adjusted difference, 459.8; 95% CI, 82.0-837.6; P = 0.0171) or financial incentives (adjusted difference, 327.9; 95% CI, -50.2 to 706; P = 0.09) arms, after adjusting for multiple comparisons. Behaviorally-designed gamification, loss-framed financial incentives, and the combination of both increased physical activity compared with control over a 12-month intervention period, with the largest effect in gamification + financial incentives. These interventions could be a useful component of strategies to reduce cardiovascular risk in high-risk patients.

Active control method for fluid borne noise in aerospace fluid systems of variable operation statuses

In the fluid system of aerospace vehicles, the fluid-borne noise (FBN) may induce vibration and damage to components. The FBN may limit the performance of the entire onboard system. To achieve a stable active elimination for the FBN is not easy, for many variable operation statuses exist in practical systems, such as varying-frequency and varying-load status. In this work, an improved feed-forward active control method based on narrowband adaptive notch filters, with an online identification module, is proposed. The algorithm includes three adaptive filters: an adaptive notch filter for producing cancelling signal by using filtered-X least mean square (FXLMS) algorithm, one for online identification to model the real-time secondary path, and an error prediction filter for extracting the precise error for online identification. In the aircraft hydraulic system of high pressure, a so-called relief scheme, also known as the bypass structure, is used for the FNB, controlling an active control valve in the branched line to overflow the main fluid line. The system is modelled with software AMESim for the fluid part and Matlab for the control algorithm. Simulation results show that the control method can performance well in the situations of varying frequency and load. The test rig of a hydraulic system is established, which could change pump speed and fluid pressure. The test results show that more than 90% reduction for a certain frequency can be achieved for stable pressure statuses. And more than 50% reduction is achieved for varying frequency with step changes. As for the load-varying status, the reduction of 82.7% and 65.8% are obtained before and after pressure change. The method proposed is validated to be effective with both numerical and experimental tests.