Dynamic Simulation Test Research Articles

Research on ride comfort evaluation method of EMU based on CART algorithm

In this paper, the research team presents the findings of long-term tracking tests on power-centralized EMU. The results demonstrate clear discrepancies between the established ride comfort evaluation results and the actual vibration state of the vehicle body and the subjective experiences of the drivers and passengers. A fuzzy evaluation was employed to establish the data set, while the entropy weight method was used to determine the key indexes. The CART decision tree algorithm was then used to establish a model for the evaluation of ride comfort in power-centralized EMU. The resulting evaluation was verified through dynamic simulation and field testing. The findings of the research demonstrate that: The lateral ride index can be employed as the primary index for evaluating the vibration state of the vehicle. By implementing three consecutive lateral ride comfort evaluations of the vehicle, the false positive rate and false negative rate can be maintained below 4%. The accuracy of the evaluation results is greater than 95% when a CART decision tree model is constructed using the minimum, maximum, standard deviation, and 50th percentile of the lateral ride index of the vehicle. The results of the simulation and field tests demonstrate that the ride comfort evaluation results are highly consistent with the actual vibration state of the moving EMU, the annoyance rate, and the human subjective feeling. This paper presents a comprehensive analysis of the research content, taking into account the subjective experiences of drivers and passengers, as well as the practical considerations of railway maintenance personnel. The findings offer a valuable contribution to the decision-making process of railway maintenance professionals.

Analysis and Experimentation on the Motion Characteristics of a Dragon Fruit Picking Robot Manipulator

Due to the complex growth positions of dragon fruit and the difficulty in robotic picking, this paper proposes a six degrees of freedom dragon fruit picking robot and investigates the manipulator’s motion characteristics to address the adaptive motion issues of the picking manipulator. Based on the agronomic characteristics of dragon fruit cultivation, the structural design of the robot and the dimensions of its manipulator were determined. A kinematic model of the dragon fruit picking robot based on screw theory was established, and the workspace of the manipulator was analyzed using the Monte Carlo method. Furthermore, a dynamic model of the manipulator based on the Kane equation was constructed. Performance experiments under trajectory and non-trajectory planning showed that trajectory planning significantly reduced power consumption and peak torque. Specifically, Joint 3’s power consumption decreased by 62.28%, and during the picking, placing, and resetting stages, the peak torque of Joint 4 under trajectory planning was 10.14 N·m, 12.57 N·m, and 16.85 N·m, respectively, compared to 12.31 N·m, 15.69 N·m, and 22.13 N·m under non-trajectory planning. This indicated that the manipulator operates with less impact and smoother motion under trajectory planning. Comparing the dynamic model simulation and actual testing, the maximum absolute error in the joint torques was −2.76 N·m, verifying the correctness of the dynamic equations. Through field picking experiments, it was verified that the machine’s picking success rate was 66.25%, with an average picking time of 42.4 s per dragon fruit. The manipulator operated smoothly during each picking process. In the study, the dragon fruit picking manipulator exhibited good stability, providing the theoretical foundation and technical support for intelligent dragon fruit picking.

In Silico Study Active Compounds of Jamu Against Pre-Eclampsia Through Anti-Vasoconstriction and Anti-Inflammation

Preeclampsia is one of serious pregnancy-related condition that marked by elevated blood pressure and proteinuria that typically emerges during the second trimester or above 20 week, this disease become the second common cause of maternal death globally per year. One factors that can initiate preeclampsia are immunologic factor. Preeclampsia is started with abnormal trophoblast development and poor or shallow placental blood vessel development. Several protein that are induce by pre eclampsia are ACE1 (as vasoconstrictor), p38α, and JNK (stress-related protein and induce inflammation). One of the natural medicine in Indonesia is a “Jamu” that refers to traditional herbal medicine derived from natural ingredients such as herbs, roots, and spices.. In this research we are trying to predict several compounds in early-month pregnant jamu to tackle activation of ACE1, JNK, and p38α. Firstly, all of jamu compound was screened using Lipinski and bioavaibility test. Then, all of the jamu compound that pass the test before will be docked with ACE1, JNK, and p38α using Vina wizard in PyRx. The highest affinity in docking result will be visualized using Biovia Discovery Studio 2019, and will advance to molecular dynamics simulation test to determine stability of the complex in cell environment. The result show that kaempferol can stabily bind to p38α protein, with only induce minimum fluctuation in all RMSD and RMSF result. Piperanine can stabily bind JNK protein with also minimum fluctuation in all RMSD and RMSF result. Both kaempferol and piperanine did’t violate any Lipinski rule and Bioavaibility test.

Chicoric acid acts as an ALOX15 inhibitor to prevent ferroptosis in asthma

BackgroundChicoric acid (CA) is a crucial immunologically active compound found in chicory and echinacea, possessing a range of biological activities. Ferroptosis, a type of iron-dependent cell death induced by lipid peroxidation, plays a key role in the development and advancement of asthma. Targeting ferroptosis could be a potential therapeutic strategy for treating asthma. PurposeThe purpose of this study was to explore the screening of ALOX15, a pivotal target of ferroptosis in asthma, and potential therapeutic agents, as well as to investigate the promising potential of CA as an ALOX15 inhibitor for modulating ferroptosis in asthma. MethodsThrough high-throughput data processing of bronchial epithelial RNA from asthma patients using bioinformatics and machine learning, the key target of ferroptosis in asthma, ALOX15, was identified. An inhibitor of ALOX15 was then obtained through high-throughput molecular docking and molecular dynamics simulation tests. In vitro experiments were conducted using a 16HBE cell model induced by house dust mite (HDM) and lipopolysaccharide (LPS), which were treated with the ALOX15 inhibitor (PD146176), CA treatment, or ALOX15 knockdown. In vivo experiments were also carried out using a mouse model induced by HDM and LPS. ResultsThe composite model of ALOX15 and CA in molecular dynamics simulations shows good stability and flexibility. Network pharmacological analysis reveals that CA regulates ferroptosis through ALOX15 in treating asthma. In vitro studies show that ALOX15 is highly expressed in HDM and LPS treatments, while CA inhibits HDM and LPS-induced ferroptosis in 16HBE cells by reducing ALOX15 expression. Knockdown of ALOX15 has the opposite effect. Metabolomics analysis identifies key compounds associated with ferroptosis, including L-Targinine, eicosapentaenoic acid, 16-hydroxy hexadecanoic acid, and succinic acid. In vivo experiments demonstrate that CA suppresses ALOX15 expression, inhibits ferroptosis, and improves asthma symptoms in mice. ConclusionOur research initially identified CA as a promising asthma treatment that effectively blocks ferroptosis by specifically targeting ALOX15. This study not only highlights CA as a potential therapeutic agent for asthma but also introduces novel targets and treatment options for this condition, along with innovative approaches for utilizing natural compounds to target diseases associated with ferroptosis.

Simulation analysis of CFD of composite pressure-resistant vessel pressure resistance and uplift process

Abstract A pressure-resistant vessel is the core equipment of deep-diving equipment, which needs to have good pressure-resistant performance. In this paper, due to the problem that it is difficult to monitor the pressure-resistant vessel in the real diving process, we design a lightweight carbon fibre pressure-resistant vessel, construct a finite element model of the pressure-resistant vessel in deep diving, and carry out simulation and analysis, so as to provide a simulation test method for the real diving work. Specifically, the pressure-resistant vessel is subjected to finite element analysis at typical depths, and the floating process of the pressure-resistant vessel under different working conditions is simulated by using Computational Fluid Dynamics (CFD) simulation and orthogonal tests. Comparison of the CFD simulation results with the orthogonal test results proves that the selected pressure-resistant vessel can meet the working requirements under different working conditions.

Preparation of a Gradient Anti-Oxidation Coating for Aircraft C/C Composite Brake Disc and Its High-Temperature In Situ Self-Healing Performance.

We studied a gradient anti-oxidation coating of C/C composite materials for aircraft brake discs with a simple process and low costs. The gradient coating consists of two layers, of which the inner layer is prepared with tetraethyl orthosilicate (Si (OC2H5)4), C2H5OH, H3PO4 and B4C, and the outer layer is prepared with Na2B4O7.10H2O, B2O3, and SiO2 powder. The experimental results show that after being oxidized at 700 °C for 15 h, the oxidation weight loss of the sample with the coating was only -0.17%. At the same time, after 50 thermal cycles in air at 900 °C, the sample's oxidation weight loss was only -0.06%. We conducted the 1:1 dynamic simulation test for aircraft brake discs, and the brake disc did not oxidize, thus meeting the requirements for aircraft use. In addition, the anti-oxidation mechanism of the coating was analyzed via scanning electron microscopy (SEM), X-ray diffraction (XRD), differential thermal analysis (DSC-TGA), and high-temperature in situ SEM.

Unveiling molecular insights: in silico exploration of TLR4 antagonist for management of dry eye syndrome

BackgroundDry eye disease is the most commonplace multifractional ocular complication, which has already affected millions of people in the world. It is identified by the excessive buildup of reactive oxygen...

Research on rapid batch test technology of small satellite attitude and orbit control system

The attitude and orbit control sub-system of small satellites is an important sub-system to ensure the stable operation of satellites in orbit, and its testing in the satellite factory development stage runs through the whole testing process. Most of the traditional attitude and orbit control sub-system tests require the cooperation of many people to complete the performance tests of various components and sensitive devices, which also leads to the complicated and time-consuming testing process of the sub-system. At present, the mass production of small satellites is developing rapidly. In order to meet the urgent needs of small satellite mass production, the traditional attitude control subsystem test equipment and methods can’t meet the requirements of satellite mass production mode. In order to meet the needs of small satellite mass development, this paper studies the rapid batch test technology of small satellite attitude and orbit control systems. A fast pipeline test system which can support the performance and dynamics simulation of various components of a multi-satellite attitude and orbit control subsystem is studied. Based on the architecture of real-time communication between the upper computer and lower computer, the system can realize the integration and rapid testing of component performance and dynamic simulation. A continuous dynamic simulation test of 2140 seconds was carried out for the cruise mode and attitude maneuver mode of a certain type of satellite in orbit. During the test, various components and sensors of the attitude and orbit control subsystem operate correctly and can support the stable operation of the required attitude in various modes of the satellite, which can verify the correctness of the interface and performance of the satellite attitude and orbit control subsystem. The research results greatly reduce the input of manpower and material resources, and greatly improve the test efficiency. It lays a foundation for the rapid batch test of the small satellite attitude control subsystem.

Grasping characteristics of SMA bionic flexible dexterous hand

In order to achieve the mechanical performance of grasping objects with SMA bionic flexible hands, a tendon finite element modeling method is proposed in this article to meet the mechanical requirements of the tendon being subjected to only axial forces and not radial forces. By using finite element dynamic simulation and experimental testing methods, the mechanical characteristics of the SMA bionic hands during the grasping process are analyzed and validated. A finite element dynamic simulation model of the SMA bionic hand grasping process is established to study the overall stress characteristics and contact forces of each phalanx, revealing the grasping characteristics of the bionic hand under SMA driving conditions. By creating a physical prototype of the SMA bionic hand, grasping of different objects is achieved. The results show that the stress in the grasping state of the bionic hand does not exceed 21 MPa, the sum of contact forces is 22 N, the theoretical grasping force is 13 N, and the prototype can grasp objects within a diameter range of 70 mm.

DOCKING AND MD OF GOTU KOLA (Centella asiatica L.) COMPOUNDS TO AT1 RECEPTORS AS ANTIHYPERTENSIVES

Non-communicable diseases, including hypertension, are a significant source of health issues in developed nations[MOU1] . Angiotensin II Receptor Blocker (ARB) is frequently used as the first-line treatment for hypertension. ARB works by inhibiting Angiotensin II which can cause vasoconstriction of entire blood vessels[l2] . This study aimed to find lead compound of 54 compounds obtained from gotu kola (Centella asiatica L.) in order to determine the antihypertensive activity. The target of drug action chosen in this study was the type 1 angiotensin II receptors (AT1). Molecular docking and molecular dynamics simulation were chosen as the methods in this study to predict the interaction and the affinity and stability of the interaction. Based on the results of molecular docking, it was found that the compound of campesterol, centellasaponin B, and corosolic acid gave good affinity to the targets. The test ligand that the Ki and DG values were close to the natural ligand (Olmesartan) campesterol with a value of -10.79 kcal/mol and 12.28 nM. Meanwhile, in the molecular dynamics simulation test, it was found that corosolic acid has good interaction stability with the targets and was constant from the beginning of the simulation to 100 ns, while for MMGBSA centellasaponin B the lowest total energy value was -71.4347 kcal/mol. It was concluded that the gotu kola (Centella asiatica L.), compound corosolic acid, and centellasaponin B had the potential as a lead compound that had affinity and stability for the interaction with the AT1 receptor as antihypertensives.

Enhanced flotation performance and adsorption mechanism on (0 0 2) crystal plane of fine muscovite powder

Muscovite crystal has anisotropy, the flotation performance is determined by the adsorption of collectors on its specific crystal plane. This study focused on the adsorption mechanism of sodium dodecyl sulfate (SDS) and sodium dodecyl benzene sulfonate (SDBS) used as muscovite collectors on its (002) crystal plane. The flotation experiment showed that SDS has better flotation efficiency than SDBS. The adsorption behavior on the muscovite (002) crystal plane was demonstrated by contact angle, infrared spectrum tests, molecular dynamics simulation and XRD test. The results indicated that SDS had lower adsorption energy with muscovite (002) crystal plane, and was more likely to adsorb on the muscovite (002) crystal plane. What’s more, the reduction degree of the strength of the (002) crystal plane after SDS was lower than that of SDBS. It clearly proves the superiority of SDS on the adsorption of the muscovite (002) crystal plane, and provide a new idea for the muscovite flotation.

Mechanism of physical hardening on the fracture characteristics of polymer-modified asphalt binder

This article aims to reveal the physical hardening mechanism of polymer-modified asphalt binder (PMA) and accurately assess its impact on the low-temperature fracture properties of asphalt binders. Base asphalt binder (BA), styrene–butadiene–styrene modified asphalt binder (SBSMA), and crumb rubber modified asphalt binder (CRMA) were used as the research objects. Molecular dynamics (MD) simulation and differential scanning calorimetry (DSC) test were used to investigate the physical hardening mechanism of PMA at the microscopic level. The fracture characteristics of PMA under physical hardening were analyzed based on the single-edge notched beam (SENB) test. The results show that under prolonged cold service conditions, the asphalt molecular mobility is weakened, the non-bond energy and the free volume are reduced, and the molecules undergo aggregation state transformation, leading to the physical hardening of asphalt materials. In the process of physical hardening of asphalt molecules in the micro-Brownian motion of the main active force from the aromatic and saturate fractions. Considering the effect of physical hardening, it is recommended that the method used to test the low temperature properties of asphalt binders should ensure a constant temperature for at least 24 h. The crack tolerance (Ct) is recommended as the evaluation index of low-temperature cracking resistance of PMA in cold regions. The Ct of BA, SBSMA, and CRMA are reduced by 52.88 %, 12.04 %, and 35.24 %, respectively, after 24 h of constant low temperature. This indicating that the polymer modifiers can improve the fluidity of asphalt molecules, inhibit molecular aggregation, and reduce the effect of physical hardening on asphalt binders. Thermo-oxidative aging can aggravate the physical hardening phenomenon of asphalt binder, and the higher the degree of thermo-oxidative aging, the more severe the physical hardening of asphalt binder. The related research results provide the theoretical basis and technical support for the accurate design and development of the low-temperature performance of asphalt binders for roads in cold regions.

High tensile strength glass fiber with different ratios of Na2O and SiO2 prepared by chemical strengthening method

In this paper, chemical strengthening method was used to prepare high strength glass fiber with different Na2O/SiO2 molar ratios (N/S). The structure, viscosity and tensile strength of glass samples were investigated by Molecular dynamics (MD) simulation, Raman, rotational viscometer and tensile strength tests. Results showed that the variation trends of Qn units obtained by MD simulation and Raman spectra were consistent, both indicating the decrease of the degree of network polymerization (DNP) with N/S ratio increasing. Additionally, the DNP had excellent linear relationships with the glass forming temperature and tensile strength of fresh glass fiber, respectively. However, the tensile strength was significant improved after chemical strengthening. When N/S ratio increased or chemical strengthening time prolonged, the enhancement rate of tensile strength of treated glass fiber was increased. The optimal tensile strength of glass fiber was 3089.38 ± 7 MPa after chemical strengthening at 390 °C for 30 min with N/S ratio 0.17.

Study on the Fabrication Process of X-ray Focusing Mirrors.

The eXTP (enhanced X-ray Timing and Polarization) satellite is a prominent X-ray astronomy satellite designed primarily for conducting deep space X-ray astronomical observations. The satellite's scientific payload consists of X-ray focusing mirrors. In order to fulfill the requirements of weight reduction and enhanced effective area, the thickness of mirrors is reduced to the sub-millimeter range and a multi-layer nested structure is employed. Manufacturing mirrors poses a significant challenge to both their quality and efficiency. The present research investigates the optimal replication process for mandrel ultraprecision machining, polishing, coating, electroforming nickel, and demolding. It analyzes the factors contributing to the challenging separation and the inability to release the mirror shells. Additionally, an automatic demolding device is developed, and the X-ray performance of the replication mirrors is verified. The fabrication process flow of the mirrors was initially introduced. To ensure the easy release of the mirror shells from the mandrels, a layer of diamond-like carbon (DLC) was applied as a release layer between the Au and NiP alloy. The adhesion strength of Au-C was found to be significantly lower than that of Au-NiP, as demonstrated by both molecular dynamic simulation and tensile testing. The development of an automatic demolding device with force feedback has been successfully completed. The reduction in the half-power diameter (HPD) of the mirror from 48 inches to 25 inches is an improvement that surpasses the production target.

Aspen Plus simulation for effluent reuse in thermomechanical pulp mills.

The objective of this study was to evaluate the closing of the water circuit and reusing the treated effluent in the production of TMP, using simulations performed with the Aspen Plus®. The treated effluent was reused to replace 50, 75 and 100% of the well water. An adaptation of the Aspen Plus® program simulating the TMP production process and a dynamic simulation test to verify the accumulation of non-process elements (NPEs) in industrial processes at different proportions of reuse were evaluated. The quality of the final product was assessed in laboratory bleaching tests for pulp brightness and brightness reversion. The concentrations of the NPE were 0.00097, 0.00122 and 0.00145 kmol/h for Mn2+, 0.012929, 0.018368 and 0.023595 kmol/h for Fe2+ and 0.000542, 0.000722 and 0.000948 kmol/h for Cu2+, with the recycling of the treated effluent of 50, 75 and 100%, respectively. The brightness and brightness reversion of the pulp were similar with the different proportions of effluent reuse and with the use of fresh industrial water, with values ranging from 83.37 to 83.97% ISO and 5.43 to 6.38 ISO units, respectively. The use of treated effluent did not affect the pulp quality, which could diminish the water use a pulp mil.

Relative roll control of satellite docking using electromagnetic coils

An electromagnetic coil topology and its control strategy, which can be incorporated into the electromagnetic docking device, have been proposed for the relative roll control of two satellites in space. The target satellite and the chaser satellite are respectively embarked with four and six coils evenly arranged around the docking axis. All the coils on the target satellite are Direct Current (DC) energized, while the currents in the coils of the chaser satellite are regulated to achieve the relative roll control. The electromagnetic force/torque model is built by utilizing the frequently-used far field model. Based on the fundamental components extracted from that model, this paper proposes a real-time magnetic moment vector distribution formula that simply generates a constant roll torque. This paper not only presents an equation for calculating the relative roll angle through the Euler angles of two satellites, but also an equation that converts the roll torque setpoint to the setpoints of the coil currents. A 3-closed-loop positioning controller composed of angle, angular velocity, and current loop is developed. The proposed topology is verified by finite element simulation, and the control strategy is validated by dynamics simulation and ground-based tests.

Effect of SiO2 nano-interphase on the water absorption mechanism of natural fiber reinforced composites: A multi-scale study

Natural fiber reinforced composites are emerging as a sustainable alternative to traditional materials in various industrial applications. However, their long-term performance under outdoor conditions is adversely affected by moisture absorption and interface failure. In this study, we design a SiO2 nano-interphase between the jute fibers (Jute) and polypropylene (PP) to prevent the composites (Jute-SiO2/PP composites) against the interface failure caused by water absorption under wet conditions. Combining molecular dynamic (MD) simulation, microstructure characterization and macroscopic water absorption test, we elaborate on the underlying mechanism of water absorption for Jute-SiO2/PP composites at multi-scale levels. MD simulations reveal that the SiO2/PP interface and the Jute-SiO2 interface, with their strong interlocking of molecular chains and polar interaction, respectively, effectively protect the composites from water diffusion at molecular level. Moreover, SiO2 nano-interphase with the array structure provides superior shielding against water ingress into the composites at microlevel. The cooperation of the strong molecular structure and the unique microstructure for Jute-SiO2/PP interphase results in enhanced water resistance and dimensional stability of the composites. The water uptake and the thickness swelling of Jute-SiO2/PP composites are reduced by 3.6% and 3.0%, respectively. Our study offers new insights into leveraging sustainable biomaterials in moisture-prone applications.

Defect-Engineered ZIF-Derived Non-Pt Cathode Catalyst at 1.5mgcm-2 Loading for Proton Exchange Membrane Fuel Cells.

Due to the sluggish kinetics of the oxygen reduction reaction (ORR) by non-Pt based catalyst, high loading of catalyst is required to achieve satisfactory fuel cell performance, which inevitably leads to the increase of the catalyst layer thickness with serious mass transport resistance. Herein, a defective zeolitic imidazolate framework (ZIF) derived Co/Fe-N-C catalyst with small mesopores (2-4nm) and high density of CoFe atomic active sites are prepared by regulating the Fe dosage and pyrolysis temperature. Molecular dynamics simulation and electrochemical tests indicate that >2nm mesopores show insignificant influence on the diffusion process of O2 and H2 O molecules, leading to the high utilization of active sites and low mass transport resistance. The proton exchange membrane fuel cell (PEMFC) shows a high-power density of 755mWcm-2 with only 1.5mgcm-2 of non-Pt catalyst in the cathode. No apparent performance loss caused by concentration difference can be observed, in particular in the high current density region (1Acm-2 ). This work emphasizes the importance of small mesopore design in the Co/Fe-N-C catalyst, which is anticipated to provide essential guidance for the application of non-Pt catalysts.

A Numerical-Experimental Framework to Separate the Effects of Different Turbulence Components on the Buffeting Forces of Bluff-body Structures

In conventional buffeting analyses of flexible civil engineering structures, the differences between the effects of longitudinal (u-) and vertical (w-) turbulence components were usually ignored. This assumption could cause unpredictable errors and needs to be refined. To improve the accuracy of buffeting analyses, this paper proposes a framework combining Computational Fluid Dynamics simulation and wind tunnel test to analyze the buffeting forces considering the differences between turbulence components. First, the Aerodynamic Admittance Functions (AAFs) with respect to u- and w- turbulence are numerically evaluated. Next, the total buffeting forces are experimentally measured. Finally, the numerical and experimental results are combined following a theoretical scheme to separate the effects of u- and w-turbulence. Results show that u- and w- turbulence have different contributions to the buffeting forces, directly indicating the inaccuracy of the conventional assumption. In the turbulence field investigated, the buffeting lift force at zero angle of attack (AoA) are all contributed from the w-turbulence, while the contribution from u-turbulence increase as AoA increases. This numerical-experimental framework overcomes the limitations of the conventional method by quantitatively describing the different contributions of u- and w- turbulence.

Research on Temporal Patterns of Water-Rock Interaction in the Coal Mine Underground Reservoir Based on the Dynamic Simulation Test.

The temporal pattern of water-rock interaction is significant in predicting the ion concentration of the effluent in coal mine underground reservoirs. This study used the roof-caved rock samples and main incoming water (mine water and fissure water) of the Daliuta coal underground reservoir as the research object and designed four groups of dynamic simulation experiments of the water-rock interaction. Based on the main ion concentrations in the water sample at different reaction times, Q-type hierarchical cluster analysis (HCA) was used to classify the stages of water-rock interaction. The types and intensities of water-rock interaction in each stage were identified by combining the ion ratio and principal component analysis (PCA). Q-type HCA shows that the dynamic simulation experimental water samples can be divided into three categories according to the reaction time, representing the early, middle, and late stages of the water-rock interaction process. The influence of water quality on the division of the water-rock interaction stage is greater than that of rock characteristics. The ion ratio and PCA show that the dissolution of pyrite minerals, cation exchange reaction, and mineral adsorption mainly occur in the early stage of water-rock interaction, in which the cation exchange reaction plays a leading role in the change of ions in water. In the middle stage, the cation exchange reaction and the dissolution of carbonate minerals, such as calcite and dolomite, mainly occur, in which mineral dissolution is the main. In the late stage, the water-rock interaction is relatively weak, and the change of ion concentration in water is not obvious. This study proves the temporal patterns of water-rock interaction between caved rock and mine water (or fissure water) and differences in the types and intensities of water-rock interaction in each stage. The results can provide a theoretical basis for the optimization of the operation cycle of coal mine underground reservoirs and the prediction of effluent ion concentration.