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"Launching"
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Study of effectiveness evaluation for liquid rocket platform
To address the issue that liquid rocket launch pad performance metrics fail to meet national space development requirements and constrain the enhancement of space launch capabilities, an evaluation index system for launch pad effectiveness has been established. Employing the Analytic Hierarchy Process (AHP) and Multi-Attribute Decision-Making (MADM) methodology, a multi-attribute performance evaluation model for launch pads was constructed. Based on this model, a comprehensive assessment of a specific launch pad’s performance was conducted. Recommendations for enhancing the launch pad’s performance were formulated based on the evaluation and analysis results. This validated the rationality of the multi-attribute performance evaluation model for launch pads, providing a reference basis for the design, operation, and improvement of launch facilities.
Journal Article
Dynamic Simulation Analysis and Research of Overhang Cold Launching System
In order to study the structural dynamic response and the separation rule of launch tube and missile of the overhang cold launching system during launching, and provide a basis for the design of new overhang launching system, a dynamic model of the overhang cold launching system was established by using the rigid-flexible coupling method and multi-body dynamics according to the structural characteristics and ejection physical process of the overhang cold launching system. The accuracy and rationality of the modeling method proposed by this paper were validated against the test. Based on this, the dynamic response of ejection and outlet attitude were analysed. The results show that the dynamic model of overhang cold launching system can accurately reflect the vibration characteristics of the system. A large longitudinal displacement of the center of launch tube will occur during the ejection process. The oscillation frequency is relatively small, but the structural vibration caused by the ejection impact will have a great influence on the pitching attitude of the missile. The vibration response of the adjacent launch tube is small, which is beneficial for the continuous launching of the overhang launching system. The research results can provide a basis for the subsequent design of vibration reduction.
Journal Article
Research method on the relationship between water bottle rocket acceleration and key parameters based on elastic force
In this paper, the effect of water volume and air pressure on the water bottle rockets acceleration is systematically researched. To solve the limited space and measuring equipment of the traditional teaching scenario, we chose the elastic force detection platform as our new experiment. A spring-based tension detection device intuitively shows the changes in water bottle rocket launch acceleration. The research verifies the applicability of Newton’s laws in variable-mass systems, explains the dynamic balance mechanism between thrust and inertial mass, supplies an example, and optimizes parameter combinations for middle school physics teaching, with obvious practical value.
Journal Article
Research on evaluation model of satellite health of space launch site based on parameter statistics
In order to evaluate the health status of the satellite before launch at the space launch site, a satellite evaluation model based on parameter statistics is proposed. By analyzing the satellite test process, the general test items are obtained. The weight factor of the importance of the test item through scoring is set by multiple experts. By subdividing the qualitative and quantitative evaluation items and constructing the calculation model of the healthy degree and stability degree, a set of evaluation methods for the stage healthy degree of the satellite launch site is obtained. After many practices and revisions, the research results can quantitatively evaluate the overall health status of the satellite at the launch site stage, provide a decision basis for whether the satellite meets the launch conditions before launch, and effectively support the satellite test and evaluation work.
Journal Article
Ablation experiment study on protective materials for sea launch and recovery platforms
Sea launch is a new method that eliminates the risk of falling debris threatening ground personnel and property compared to traditional land-based launches. However, during rocket launches and recoveries, sea launch and recovery platforms endure high temperatures, pressures, intense erosion, and high heat flux. The use of protective materials is crucial for stable operation and efficient service. This paper presents two cases of nozzle flame ablation experiments and five cases of oxy-acetylene flame ablation experiments to validate the protective effect of the materials and mitigate risks associated with sea launches. Thermocouples and infrared thermography revealed that the temperature behind the protective material’s backing did not exceed 400 K, and the backing structure remained intact post-experiment, with only surface carbonization observed, indicating effective erosion and ablation resistance.
Journal Article
3D safe motion control for quadrupedal robots in confined space launch site environments
To address the motion safety challenges faced by quadrupedal robots when performing automated inspection tasks within the confined and structurally complex environment of space launch sites, this paper proposes a nonlinear model predictive control method incorporating precise obstacle avoidance constraints. To enhance the precision of motion control, the geometric shapes of the quadrupedal robot and environmental obstacles are represented as polytopes. Utilising the strong duality theory of convex optimization, the originally non-smooth and non-differentiable distance constraints between the robot and obstacles are transformed into smooth, differentiable constraints. These are then integrated into the NMPC motion control framework. To achieve comprehensive environmental adaptability, the proposed method extends obstacle avoidance movement from a two-dimensional plane to three-dimensional space. This paper conducts experimental validation across four typical obstacle scenarios. The results demonstrate that the proposed method effectively ensures the movement safety and passability of robots within complex, confined launch site environments, thereby providing a reliable technical solution for automated inspection at space launch facilities.
Journal Article
Quantum circuits with many photons on a programmable nanophotonic chip
Growing interest in quantum computing for practical applications has led to a surge in the availability of programmable machines for executing quantum algorithms
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,
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. Present-day photonic quantum computers
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have been limited either to non-deterministic operation, low photon numbers and rates, or fixed random gate sequences. Here we introduce a full-stack hardware−software system for executing many-photon quantum circuit operations using integrated nanophotonics: a programmable chip, operating at room temperature and interfaced with a fully automated control system. The system enables remote users to execute quantum algorithms that require up to eight modes of strongly squeezed vacuum initialized as two-mode squeezed states in single temporal modes, a fully general and programmable four-mode interferometer, and photon number-resolving readout on all outputs. Detection of multi-photon events with photon numbers and rates exceeding any previous programmable quantum optical demonstration is made possible by strong squeezing and high sampling rates. We verify the non-classicality of the device output, and use the platform to carry out proof-of-principle demonstrations of three quantum algorithms: Gaussian boson sampling, molecular vibronic spectra and graph similarity
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. These demonstrations validate the platform as a launchpad for scaling photonic technologies for quantum information processing.
A system for realizing many-photon quantum circuits is presented, comprising a programmable nanophotonic chip operating at room temperature, interfaced with a fully automated control system.
Journal Article