An efficient regulation approach for tomographic reconstruction in combustion diagnostics based on TDLAS method

Xin, Mingyuan; Song, Junling; Rao, Wei; Hong, Yanji; Jiang, Yajing

doi:10.1016/j.cja.2020.09.042

Cited by 12 publications

(5 citation statements)

References 23 publications

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“…As shown in Figure 6 , a simplified concentration map on the horizontal plane is generated to explore the optimal selection of parameter ω , employing the Gaussian bimodal model for this investigation. Given no prior information of the target field, the reconstruction performance of the four-angle parallel optical path layout is demonstrated to be satisfactory [ 44 , 45 ].…”

Section: Resultsmentioning

confidence: 99%

Vertical Distribution Mapping for Methane Fugitive Emissions Using Laser Path-Integral Sensing in Non-Cooperative Open Paths

Wang,

Li,

et al. 2024

Sensors

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Observing the vertical diffusion distribution of methane fugitive emissions from oil/gas facilities is significant for predicting the pollutant’s spatiotemporal transport and quantifying the random emission sources. A method is proposed for methane’s vertical distribution mapping by combining the laser path-integral sensing in non-non-cooperative open paths and the computer-assisted tomography (CAT) techniques. It uses a vertical-plume-mapping optical path configuration and adapts the developed dynamic relaxation and simultaneous algebraic reconstruction technique (DR-SART) into methane-emission-distribution reconstruction. A self-made miniaturized TDLAS telemetry sensor provides a reliable path to integral concentration information in non-non-cooperative open paths, with Allan variance analysis yielding a 3.59 ppm·m sensitivity. We employed a six-indexes system for the reconstruction performance analysis of four potential optical path-projection configurations and conducted the corresponding validation experiment. The results have shown that that of multiple fan-beams combined with parallel-beam modes (MFPM) is better than the other optical path-projection configurations, and its reconstruction similarity coefficient (ε) is at least 22.4% higher. For the different methane gas bag-layout schemes, the reconstruction errors of maximum concentration (γm) are consistently around 0.05, with the positional errors of maximum concentration (δ) falling within the range of 0.01 to 0.025. Moreover, considering the trade-off between scanning duration and reconstruction accuracy, it is recommended to appropriately extend the sensor measurement time on a single optical path to mitigate the impact of mechanical vibrations induced by scanning motion.

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Section: Resultsmentioning

confidence: 99%

Vertical Distribution Mapping for Methane Fugitive Emissions Using Laser Path-Integral Sensing in Non-Cooperative Open Paths

Wang,

Li,

et al. 2024

Sensors

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“…The other is generated by the veins made of different carbon fibre rods and carbon fibre sheet. The right-hand side of figure 3(A) shows two types of wings with different vein distributions, both of which are commonly and popularly used in flapping wing robots [20,25,27,28]. The main difference between them is the position of main beam 2.…”

Section: Wing Morphology and Coordinatesmentioning

confidence: 99%

“…This conclusion was also proved by Wu et al [17,18], and, in the same year, Wei et al [19] designed and tested a motor-driven FWR named RotorBee, achieving the first untethered vertical takeoff and landing of an FWR in the world. It is worth mentioning that in 2020 Xin et al [20] introduced a three-wing motor-driven FWR which can perform controlled stable flight through the control surfaces. They conducted a series of flight tests including hovering flight and forward flight tests on the proposed FWR, and the results show that the prototype can maintain its attitude in the space and track the desired attitude.…”

Section: Introductionmentioning

confidence: 99%

“…To date, most of the proposed FWRs [8,[19][20][21] still contain complex mechanical transmission structures, which strictly confine the wing's otherwise freely variable flapping trajectory, and further limit the aerodynamic optimization and controller design of FWRs. Furthermore, since the flapping wing part only provides an upward force without control torques, it also needs adjunct control surfaces powered by actuators that are cumbrous to stabilize.…”

Section: Introductionmentioning

confidence: 99%

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Design, modelling, and experimental validation of a self-rotating flapping wing rotorcraft with motor–spring resonance actuation system

Liu¹,

Song²,

Dong³

et al. 2023

Bioinspir. Biomim.

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Compared with traditional flapping motion, Flapping Wing Rotor (FWR) frees the rotating freedom by installing the two wings asymmetrically, which introduces rotor’s motion characteristics and enables FWR to have higher lift and aerodynamic efficiency at low Reynolds number. However, most of the proposed FWRs contain linkage mechanical transmission structures, the fixed degrees of freedom (DoFs) of which prohibit the wings from achieving variable flapping trajectories, limiting the further optimization and controller design of FWRs. In order to fundamentally address the above challenges of FWRs, this paper presents a new type of FWR with two mechanically decoupled wings, which are directly driven by two independent motor- spring resonance actuation systems. The proposed FWR has 12.4 grams of system weight and 165-205mm wingspan. In addition, a theoretical electromechanical model based on the DC motor model and quasi-steady aerodynamic forces is established, and a series of experiments are conducted in order to figure out the ideal working point of the proposed FWR. It is notable that both our theoretical model and experiments exhibit uneven rotation of the FWR during flight, i.e., rotation speed dropping in the downstroke while boosting in the upstroke, which further tests the proposed theoretical model and uncover the relationship between flapping and passive rotation in the FWR. To further validate the performance of the design, free flight tests are conducted, and the proposed FWR demonstrates stable liftoff at the designed working point.

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“…It has high sensitivity, fast response, and nonintrusive. Lijun et al from Beijing University of Aeronautics and Astronautics [9] combined line-of-sight tunable laser absorption spectroscopy and a regularization method to measure the flame temperature distribution in a circular burner. However, this method yields the average temperature along the path of each detection light ray.…”

Section: Introductionmentioning

confidence: 99%

3D non-axisymmetric temperature field measurement using rotating tomographic mechanism schlieren method

Wu¹,

Li²,

Song³

et al. 2021

Meas. Sci. Technol.

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The tomography schlieren method is useful for calculating the non-axisymmetric temperature field, which is relevant to many industrial applications. However, the traditional tomography schlieren method requires bulky imaging devices, which limits its application. Thus, this paper proposes a non-contact three-dimensional temperature field measurement method based on the rotating tomography schlieren method. Projections from different directions of the temperature field are obtained at different angles using a transmission schlieren system, which is controlled by a designed rotating tomographic mechanism. The calibration schlieren method and the projection reconstruction algorithm are used to calculate the 3D temperature field. Verification experiments of single flame and double flame showed that the relative error of the reconstructed temperature was approximately 3.7% compared with a precision thermocouple.

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An efficient regulation approach for tomographic reconstruction in combustion diagnostics based on TDLAS method

Cited by 12 publications

References 23 publications

Vertical Distribution Mapping for Methane Fugitive Emissions Using Laser Path-Integral Sensing in Non-Cooperative Open Paths

Vertical Distribution Mapping for Methane Fugitive Emissions Using Laser Path-Integral Sensing in Non-Cooperative Open Paths

Design, modelling, and experimental validation of a self-rotating flapping wing rotorcraft with motor–spring resonance actuation system

3D non-axisymmetric temperature field measurement using rotating tomographic mechanism schlieren method

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