Analysis_Multi/app/services/CMSAnalyst.py

import ast
import json
import math

import numpy as np
import pandas as pd
from scipy.signal import hilbert

from app.config import dataBase
from app.database import get_engine
from app.logger import logger


class CMSAnalyst:
    def __init__(self, fmin, fmax, table_name, ids):
        # 从数据库获取原始数据
        self.datas = self._get_by_id(table_name, ids)
        self.datas = [df[['mesure_data', 'time_stamp', 'sampling_frequency', 'wind_turbine_number', 'rotational_speed',
                          'mesure_point_name']] for df in self.datas]
        # 只输入一个id，返回一个[df],所以拿到self.data[0]
        self.data_filter = self.datas[0]
        # 取数据列
        self.data = np.array(ast.literal_eval(self.data_filter['mesure_data'][0]))
        self.envelope_spectrum_m = self.data.shape[0]
        self.envelope_spectrum_n = 1
        # 设置分析参数
        self.fs = int(self.data_filter['sampling_frequency'].iloc[0])
        self.envelope_spectrum_t = np.arange(self.envelope_spectrum_m) / self.fs
        self.fmin = fmin if fmin is not None else 0
        self.fmax = fmax if fmax is not None else float('inf')
        self.envelope_spectrum_y = self._bandpass_filter(self.data)
        self.f, self.HP = self._calculate_envelope_spectrum(self.envelope_spectrum_y)
        # 设备信息
        self.wind_code = self.data_filter['wind_turbine_number'].iloc[0]
        self.rpm_Gen = self.data_filter['rotational_speed'].iloc[0]
        self.mesure_point_name = self.data_filter['mesure_point_name'].iloc[0]
        self.fn_Gen = round(self.rpm_Gen / 60, 2)
        self.CF = self.Characteristic_Frequency()
        self.CF = pd.DataFrame(self.CF, index=[0])
        n_rolls_m = self.CF['n_rolls'].iloc[0]
        d_rolls_m = self.CF['d_rolls'].iloc[0]
        D_diameter_m = self.CF['D_diameter'].iloc[0]
        theta_deg_m = self.CF['theta_deg'].iloc[0]
        self.bearing_frequencies = self.calculate_bearing_frequencies(n_rolls_m, d_rolls_m, D_diameter_m, theta_deg_m,
                                                                      self.rpm_Gen)
        self.bearing_frequencies = pd.DataFrame(self.bearing_frequencies, index=[0])
        # frequency_domain_analysis
        (
            self.frequency_domain_analysis_t,
            self.frequency_domain_analysis_f,
            self.frequency_domain_analysis_m,
            self.frequency_domain_analysis_mag,
            self.frequency_domain_analysis_Xrms,
        ) = self._calculate_spectrum(self.data)

        # time_domain_analysis
        self.time_domain_analysis_t = np.arange(self.data.shape[0]) / self.fs

    def _get_by_id(self, windcode, ids):
        df_res = []
        engine = get_engine(dataBase.DATA_DB)
        for id in ids:
            table_name = windcode + '_wave'
            lastday_df_sql = f"SELECT * FROM {table_name} where id = {id} "
            df = pd.read_sql(lastday_df_sql, engine)
            df_res.append(df)
        return df_res

    # envelope_spectrum_analysis 包络谱分析
    def _bandpass_filter(self, data):
        """带通滤波"""

        m = data.shape[0]
        ni = round(self.fmin * self.envelope_spectrum_m / self.fs + 1)
        if self.fmax == float('inf'):
            na = m
        else:
            na = round(self.fmax * m / self.fs + 1)
        col = 1
        y = np.zeros((self.envelope_spectrum_m, col))
        z = np.fft.fft(data)
        a = np.zeros(self.envelope_spectrum_m, dtype=complex)
        a[ni:na] = z[ni:na]
        a[self.envelope_spectrum_m - na + 1: self.envelope_spectrum_m - ni + 1] = z[
                                                                                  self.envelope_spectrum_m - na + 1: self.envelope_spectrum_m - ni + 1
                                                                                  ]
        z = np.fft.ifft(a)
        y[:, 0] = np.real(z)

        return y

    def _calculate_envelope_spectrum(self, y):
        """计算包络谱"""
        m, n = y.shape
        HP = np.zeros((m, n))
        col = 1
        for p in range(col):
            H = np.abs(hilbert(y[:, p] - np.mean(y[:, p])))
            HP[:, p] = np.abs(np.fft.fft(H - np.mean(H))) * 2 / m
        f = np.fft.fftfreq(m, d=1 / self.fs)
        return f, HP

    def envelope_spectrum(self):
        """绘制包络谱"""
        # 只取正频率部分
        positive_frequencies = self.f[: self.envelope_spectrum_m // 2]
        positive_HP = self.HP[: self.envelope_spectrum_m // 2, 0]

        x = positive_frequencies
        y = positive_HP
        title = "包络谱"
        xaxis = "频率(Hz)"
        yaxis = "加速度(m/s^2)"
        # 加速度均方根值（有效值）
        Xrms = np.sqrt(np.mean(y ** 2))
        rpm_Gen = round(self.rpm_Gen, 2)
        BPFI_1X = round(self.bearing_frequencies['BPFI'].iloc[0], 2)
        BPFO_1X = round(self.bearing_frequencies['BPFO'].iloc[0], 2)
        BSF_1X = round(self.bearing_frequencies['BSF'].iloc[0], 2)
        FTF_1X = round(self.bearing_frequencies['FTF'].iloc[0], 2)
        fn_Gen = round(self.fn_Gen, 2)
        _3P_1X = round(self.fn_Gen, 2) * 3

        result = {
            "fs": self.fs,
            "Xrms": round(Xrms, 2),
            "x": list(x),
            "y": list(y),
            "title": title,
            "xaxis": xaxis,
            "yaxis": yaxis,
            "rpm_Gen": round(rpm_Gen, 2),  # 转速r/min
            "BPFI": [{"Xaxis": BPFI_1X, "val": "1BPFI"}, {"Xaxis": BPFI_1X * 2, "val": "2BPFI"},
                     {"Xaxis": BPFI_1X * 3, "val": "3BPFI"}, {"Xaxis": BPFI_1X * 4, "val": "4BPFI"},
                     {"Xaxis": BPFI_1X * 5, "val": "5BPFI"}, {"Xaxis": BPFI_1X * 6, "val": "6BPFI"}],
            "BPFO": [{"Xaxis": BPFO_1X, "val": "1BPFO"}, {"Xaxis": BPFO_1X * 2, "val": "2BPFO"},
                     {"Xaxis": BPFO_1X * 3, "val": "3BPFO"}, {"Xaxis": BPFO_1X * 4, "val": "4BPFO"},
                     {"Xaxis": BPFO_1X * 5, "val": "5BPFO"}, {"Xaxis": BPFO_1X * 6, "val": "6BPFO"}],
            "BSF": [{"Xaxis": BSF_1X, "val": "1BSF"}, {"Xaxis": BSF_1X * 2, "val": "2BSF"},
                    {"Xaxis": BSF_1X * 3, "val": "3BSF"}, {"Xaxis": BSF_1X * 4, "val": "4BSF"},
                    {"Xaxis": BSF_1X * 5, "val": "5BSF"}, {"Xaxis": BSF_1X * 6, "val": "6BSF"}],
            "FTF": [{"Xaxis": FTF_1X, "val": "1FTF"}, {"Xaxis": FTF_1X * 2, "val": "2FTF"},
                    {"Xaxis": FTF_1X * 3, "val": "3FTF"}, {"Xaxis": FTF_1X * 4, "val": "4FTF"},
                    {"Xaxis": FTF_1X * 5, "val": "5FTF"}, {"Xaxis": FTF_1X * 6, "val": "6FTF"}],
            "fn_Gen": [{"Xaxis": fn_Gen, "val": "1X"}, {"Xaxis": fn_Gen * 2, "val": "2X"},
                       {"Xaxis": fn_Gen * 3, "val": "3X"}, {"Xaxis": fn_Gen * 4, "val": "4X"},
                       {"Xaxis": fn_Gen * 5, "val": "5X"}, {"Xaxis": fn_Gen * 6, "val": "6X"}],
            "B3P": _3P_1X,
        }
        # result = json.dumps(result, ensure_ascii=False)
        result = self.replace_nan(result)

        return result

        # frequency_domain_analysis 频谱分析

    def _calculate_spectrum(self, data):
        """计算频谱"""
        m = data.shape[0]
        n = 1
        t = np.arange(m) / self.fs
        mag = np.zeros((m, n))
        Xrms = np.sqrt(np.mean(data ** 2))  # 加速度均方根值（有效值）
        # col=1
        # for p in range(col):
        mag = np.abs(np.fft.fft(data - np.mean(data))) * 2 / m
        f = np.fft.fftfreq(m, d=1 / self.fs)
        return t, f, m, mag, Xrms

    def frequency_domain(self):
        """绘制频域波形参数"""
        # 只取正频率部分
        positive_frequencies = self.frequency_domain_analysis_f[
                               : self.frequency_domain_analysis_m // 2
                               ]
        positive_mag = self.frequency_domain_analysis_mag[
                       : self.frequency_domain_analysis_m // 2
                       ]

        x = positive_frequencies
        y = positive_mag
        title = "频域信号"
        xaxis = "频率(Hz)"
        yaxis = "加速度(m/s^2)"
        Xrms = self.frequency_domain_analysis_Xrms

        rpm_Gen = round(self.rpm_Gen, 2)
        BPFI_1X = round(self.bearing_frequencies['BPFI'].iloc[0], 2)
        BPFO_1X = round(self.bearing_frequencies['BPFO'].iloc[0], 2)
        BSF_1X = round(self.bearing_frequencies['BSF'].iloc[0], 2)
        FTF_1X = round(self.bearing_frequencies['FTF'].iloc[0], 2)
        fn_Gen = round(self.fn_Gen, 2)
        _3P_1X = round(self.fn_Gen, 2) * 3

        result = {
            "fs": self.fs,
            "Xrms": round(Xrms, 2),
            "x": list(x),
            "y": list(y),
            "title": title,
            "xaxis": xaxis,
            "yaxis": yaxis,
            "rpm_Gen": round(rpm_Gen, 2),  # 转速r/min
            "BPFI": [{"Xaxis": BPFI_1X, "val": "1BPFI"}, {"Xaxis": BPFI_1X * 2, "val": "2BPFI"},
                     {"Xaxis": BPFI_1X * 3, "val": "3BPFI"}, {"Xaxis": BPFI_1X * 4, "val": "4BPFI"},
                     {"Xaxis": BPFI_1X * 5, "val": "5BPFI"}, {"Xaxis": BPFI_1X * 6, "val": "6BPFI"}],
            "BPFO": [{"Xaxis": BPFO_1X, "val": "1BPFO"}, {"Xaxis": BPFO_1X * 2, "val": "2BPFO"},
                     {"Xaxis": BPFO_1X * 3, "val": "3BPFO"}, {"Xaxis": BPFO_1X * 4, "val": "4BPFO"},
                     {"Xaxis": BPFO_1X * 5, "val": "5BPFO"}, {"Xaxis": BPFO_1X * 6, "val": "6BPFO"}],
            "BSF": [{"Xaxis": BSF_1X, "val": "1BSF"}, {"Xaxis": BSF_1X * 2, "val": "2BSF"},
                    {"Xaxis": BSF_1X * 3, "val": "3BSF"}, {"Xaxis": BSF_1X * 4, "val": "4BSF"},
                    {"Xaxis": BSF_1X * 5, "val": "5BSF"}, {"Xaxis": BSF_1X * 6, "val": "6BSF"}],
            "FTF": [{"Xaxis": FTF_1X, "val": "1FTF"}, {"Xaxis": FTF_1X * 2, "val": "2FTF"},
                    {"Xaxis": FTF_1X * 3, "val": "3FTF"}, {"Xaxis": FTF_1X * 4, "val": "4FTF"},
                    {"Xaxis": FTF_1X * 5, "val": "5FTF"}, {"Xaxis": FTF_1X * 6, "val": "6FTF"}],
            "fn_Gen": [{"Xaxis": fn_Gen, "val": "1X"}, {"Xaxis": fn_Gen * 2, "val": "2X"},
                       {"Xaxis": fn_Gen * 3, "val": "3X"}, {"Xaxis": fn_Gen * 4, "val": "4X"},
                       {"Xaxis": fn_Gen * 5, "val": "5X"}, {"Xaxis": fn_Gen * 6, "val": "6X"}],
            "B3P": _3P_1X,
        }
        result = self.replace_nan(result)       
        result = json.dumps(result, ensure_ascii=False)
        return result


    # time_domain_analysis 时域分析
    def time_domain(self):
        """绘制时域波形参数"""
        x = self.time_domain_analysis_t
        y = self.data
        rpm_Gen = self.rpm_Gen
        title = "时间域信号"
        xaxis = "时间(s)"
        yaxis = "加速度(m/s^2)"
        # 图片右侧统计量
        # 平均值
        mean_value = np.mean(y)
        # 最大值
        max_value = np.max(y)
        # 最小值
        min_value = np.min(y)
        # 加速度均方根值（有效值）
        Xrms = np.sqrt(np.mean(y ** 2))
        # 峰值（单峰最大值） # 峰值
        Xp = (max_value - min_value) / 2
        # 峰峰值
        Xpp = max_value - min_value
        # 峰值指标
        Cf = Xp / Xrms
        # 波形指标
        Sf = Xrms / mean_value
        # 脉冲指标
        If = Xp / np.mean(np.abs(y))
        # 方根幅值
        Xr = np.mean(np.sqrt(np.abs(y))) ** 2
        # 裕度指标
        Ce = Xp / Xr
        # 计算每个数据点的绝对值减去均值后的三次方，并求和
        sum_abs_diff_cubed_3 = np.mean((np.abs(y) - mean_value) ** 3)
        # 计算偏度指标
        Cw = sum_abs_diff_cubed_3 / (Xrms ** 3)
        # 计算每个数据点的绝对值减去均值后的四次方，并求和
        sum_abs_diff_cubed_4 = np.mean((np.abs(y) - mean_value) ** 4)
        # 计算峭度指标
        Cq = sum_abs_diff_cubed_4 / (Xrms ** 4)
        result = {

            "x": list(x),
            "y": list(y),
            "title": title,
            "xaxis": xaxis,
            "yaxis": yaxis,
            "fs": self.fs,
            "Xrms": round(Xrms, 2),  # 有效值
            "mean_value": round(mean_value, 2),  # 均值
            "max_value": round(max_value, 2),  # 最大值
            "min_value": round(min_value, 2),  # 最小值
            "Xp": round(Xp, 2),  # 峰值
            "Xpp": round(Xpp, 2),  # 峰峰值
            "Cf": round(Cf, 2),  # 峰值指标
            "Sf": round(Sf, 2),  # 波形因子
            "If": round(If, 2),  # 脉冲指标
            "Ce": round(Ce, 2),  # 裕度指标
            "Cw": round(Cw, 2),  # 偏度指标
            "Cq": round(Cq, 2),  # 峭度指标
            "rpm_Gen": round(rpm_Gen, 2),  # 转速r/min

        }
        result = self.replace_nan(result)
        result = json.dumps(result, ensure_ascii=False)

        return result

    # trend_analysis 趋势图

    def trend_analysis(self):
        all_stats = []

        # 定义积分函数
        def _integrate(data, dt):
            return np.cumsum(data) * dt

        # 定义计算统计指标的函数
        def _calculate_stats(data):
            mean_value = np.mean(data)
            max_value = np.max(data)
            min_value = np.min(data)
            Xrms = np.sqrt(np.mean(data ** 2))  # 加速度均方根值（有效值）
            Xp = (max_value - min_value) / 2  # 峰值（单峰最大值） # 峰值
            Cf = Xp / Xrms  # 峰值指标
            Sf = Xrms / mean_value  # 波形指标
            If = Xp / np.mean(np.abs(data))  # 脉冲指标
            Xr = np.mean(np.sqrt(np.abs(data))) ** 2  # 方根幅值
            Ce = Xp / Xr  # 裕度指标

            # 计算每个数据点的绝对值减去均值后的三次方，并求和
            sum_abs_diff_cubed_3 = np.mean((np.abs(data) - mean_value) ** 3)
            # 计算偏度指标
            Cw = sum_abs_diff_cubed_3 / (Xrms ** 3)
            # 计算每个数据点的绝对值减去均值后的四次方，并求和
            sum_abs_diff_cubed_4 = np.mean((np.abs(data) - mean_value) ** 4)
            # 计算峭度指标
            Cq = sum_abs_diff_cubed_4 / (Xrms ** 4)
            #

            return {
                "fs": self.fs,  # 采样频率
                "Mean": round(mean_value, 2),  # 平均值
                "Max": round(max_value, 2),  # 最大值
                "Min": round(min_value, 2),  # 最小值
                "Xrms": round(Xrms, 2),  # 有效值
                "Xp": round(Xp, 2),  # 峰值
                "If": round(If, 2),  # 脉冲指标
                "Cf": round(Cf, 2),  # 峰值指标
                "Sf": round(Sf, 2),  # 波形指标
                "Ce": round(Ce, 2),  # 裕度指标
                "Cw": round(Cw, 2),  # 偏度指标
                "Cq": round(Cq, 2),  # 峭度指标
                # velocity_rms :速度有效值
                # time_stamp:时间戳
            }

        for data in self.datas:
            fs = int(self.data_filter['sampling_frequency'].iloc[0])
            dt = 1 / fs
            time_stamp = data['time_stamp'][0]
            data = np.array(ast.literal_eval(data['mesure_data'][0]))

            velocity = _integrate(data, dt)
            velocity_rms = np.sqrt(np.mean(velocity ** 2))
            stats = _calculate_stats(data)
            # 速度有效值
            stats["velocity_rms"] = round(velocity_rms, 2)
            # 时间戳
            stats["time_stamp"] = str(time_stamp)
            all_stats.append(stats)
        all_stats = [self.replace_nan(stats) for stats in all_stats]
        all_stats = json.dumps(all_stats, ensure_ascii=False)
        return all_stats

    def Characteristic_Frequency(self):
        """提取轴承、齿轮等参数"""
        # 1、从测点名称中提取部件名称（计算特征频率的部件）
        str1 = self.mesure_point_name
        # 2、连接233的数据库'energy_show'，从表'wind_engine_group'查找风机编号'engine_code'对应的机型编号'mill_type_code'
        engine_code = self.wind_code
        engine = get_engine(dataBase.PLATFORM_DB)
        df_sql2 = f"SELECT * FROM wind_engine_group WHERE engine_code = '{engine_code}'"
        df2 = pd.read_sql(df_sql2, engine)
        mill_type_code = df2['mill_type_code'].iloc[0]
        # 3、从相关的表中通过机型编号'mill_type_code'或者齿轮箱编号gearbox_code查找部件'brand'、'model'的参数信息
        # unit_bearings主轴承参数表 关键词"main_bearing"
        if 'main_bearing' in str1:
            logger.info("main_bearing")
            # df_sql3 = f"SELECT * FROM {'unit_bearings'} where mill_type_code = {'mill_type_code'} "
            df_sql3 = f"SELECT * FROM unit_bearings WHERE mill_type_code = '{mill_type_code}' "
            df3 = pd.read_sql(df_sql3, engine)
            if df3.empty:
                logger.info("警告: 没有找到有效的机型信息")
            if 'front' in str1:
                brand = 'front_bearing' + '_brand'
                model = 'front_bearing' + '_model'
                front_has_value = not pd.isna(df3[brand].iloc[0]) and not pd.isna(df3[model].iloc[0])
                if not front_has_value:
                    logger.info("警告: 没有找到有效的品牌信息")
            elif 'rear' in str1:
                brand = 'rear_bearing' + '_brand'
                model = 'rear_bearing' + '_model'
                end_has_value = not pd.isna(df3[brand].iloc[0]) and not pd.isna(df3[model].iloc[0])
                if not end_has_value:
                    logger.info("警告: 没有找到有效的品牌信息")
            else:
                # 当没有指定 front 或 end 时，自动选择有值的轴承信息
                front_brand_col = 'front_bearing_brand'
                front_model_col = 'front_bearing_model'
                rear_brand_col = 'rear_bearing_brand'
                rear_model_col = 'rear_bearing_model'
                # 检查 front_bearing 是否有值
                front_has_value = not pd.isna(df3[front_brand_col].iloc[0]) and not pd.isna(
                    df3[front_model_col].iloc[0])
                # 检查 end_bearing 是否有值
                end_has_value = not pd.isna(df3[rear_brand_col].iloc[0]) and not pd.isna(df3[rear_model_col].iloc[0])
                # 根据检查结果选择合适的列
                if front_has_value and end_has_value:
                    # 如果两者都有值，默认选择 front
                    brand = front_brand_col
                    model = front_model_col
                elif front_has_value:
                    brand = front_brand_col
                    model = front_model_col
                elif end_has_value:
                    brand = rear_brand_col
                    model = rear_model_col
                else:
                    # 如果两者都没有有效值，设置默认值或抛出异常
                    logger.info("警告: 没有找到有效的轴承信息")
                    brand = front_brand_col  # 默认使用 front
                    model = front_model_col  # 默认使用 front
            _brand = df3[brand].iloc[0]
            _model = df3[model].iloc[0]
            logger.info(f"brand = {_brand}, model = {_model}")
        # unit_dynamo 发电机参数表 关键词generator stator
        elif 'generator' in str1 or 'stator' in str1:
            logger.info("generator or 'stator'")
            df_sql3 = f"SELECT * FROM unit_dynamo WHERE mill_type_code = '{mill_type_code}' "
            df3 = pd.read_sql(df_sql3, engine)
            if 'non' in str1:
                brand = 'non_drive_end_bearing' + '_brand'
                model = 'non_drive_end_bearing' + '_model'
            else:
                brand = 'drive_end_bearing' + '_brand'
                model = 'drive_end_bearing' + '_model'

            _brand = df3[brand].iloc[0]
            _model = df3[model].iloc[0]
            logger.info(f"brand = {_brand}, model = {_model}")
            # 齿轮箱区分行星轮/平行轮 和 轴承两个表
        elif 'gearbox' in str1:
            logger.info("gearbox")
            # 根据mill_type_code从unit_gearbox表中获得gearbox_code
            df_sql3 = f"SELECT * FROM unit_gearbox WHERE mill_type_code = '{mill_type_code}' "
            df3 = pd.read_sql(df_sql3, engine)
            gearbox_code = df3['code'].iloc[0]
            logger.info(gearbox_code)
            # 如果是行星轮/平行轮 则从unit_gearbox_structure 表中取数据
            if 'planet' in str1 or 'sun' in str1:
                logger.info("'planet' or 'sun' ")
                gearbox_structure = 1 if 'planet' in str1 else 2
                planetary_gear_grade = 1
                if 'first' in str1:
                    planetary_gear_grade = 1
                elif 'second' in str1:
                    planetary_gear_grade = 2
                elif 'third' in str1:
                    planetary_gear_grade = 3
                df_sql33 = f"""
                    SELECT bearing_brand, bearing_model 
                    FROM unit_gearbox_structure 
                        WHERE gearbox_code = '{gearbox_code}' 
                        AND gearbox_structure = '{gearbox_structure}'
                        AND planetary_gear_grade = '{planetary_gear_grade}'
                        """
                df33 = pd.read_sql(df_sql33, engine)
                if df33.empty:
                    logger.info("unit_gearbox_structure没有该测点的参数")
                else:
                    brand = 'bearing' + '_brand'
                    model = 'bearing' + '_model'
                    logger.info(brand)
                    _brand = df33[brand].iloc[0]
                    _model = df33[model].iloc[0]
                    has_value = not pd.isna(df33[brand].iloc[0]) and not pd.isna(df33[model].iloc[0])
                    if has_value:
                        logger.info(_brand)
                        logger.info(_model)
                    else:
                        logger.info("警告: 没有找到有效的轴承信息")
            # 如果是齿轮箱轴承 则从unit_gearbox_bearings 表中取数据
            elif 'shaft' in str1 or 'input' in str1:
                logger.info("'shaft'or'input'")
                # df_sql33 = f"SELECT * FROM unit_gearbox_bearings WHERE gearbox_code = '{gearbox_code}' "
                # df33 = pd.read_sql(df_sql33, Engine33)
                # 高速轴 低速中间轴 取bearing_rs/gs均可
                parallel_wheel_grade = 1
                if 'low_speed' in str1:
                    parallel_wheel_grade = 1
                elif 'low_speed_intermediate' in str1:
                    parallel_wheel_grade = 2
                elif 'high_speed' in str1:
                    parallel_wheel_grade = 3
                df_sql33 = f"""
                    SELECT bearing_rs_brand, bearing_rs_model, bearing_gs_brand, bearing_gs_model 
                    FROM unit_gearbox_bearings 
                    WHERE gearbox_code = '{gearbox_code}'
                    AND parallel_wheel_grade = '{parallel_wheel_grade}'
                    """
                df33 = pd.read_sql(df_sql33, engine)
                if not df33.empty:
                    if 'high_speed' in str1 or 'low_speed_intermediate' in str1:
                        rs_brand = 'bearing_rs' + '_brand'
                        rs_model = 'bearing_rs' + '_model'
                        gs_brand = 'bearing_gs' + '_brand'
                        gs_model = 'bearing_gs' + '_model'
                        rs_has_value = not pd.isna(df33[rs_brand].iloc[0]) and not pd.isna(df33[rs_model].iloc[0])
                        gs_has_value = not pd.isna(df33[gs_brand].iloc[0]) and not pd.isna(df33[gs_model].iloc[0])
                        if rs_has_value and gs_has_value:
                            brand = rs_brand
                            model = rs_model
                        elif rs_has_value:
                            brand = rs_brand
                            model = rs_model
                        elif gs_has_value:
                            brand = gs_brand
                            model = gs_model
                        else:
                            logger.info("警告: 没有找到有效的品牌信息")
                            brand = rs_brand
                            model = rs_model
                            # 低速轴 取bearing_model
                    elif 'low_speed' in str1:
                        brand = 'bearing' + '_brand'
                        model = 'bearing' + '_model'
                else:
                    logger.info("警告: 没有找到有效的轴承信息")
                logger.info(f"brand = {brand}")
                _brand = df33[brand].iloc[0]
                _model = df33[model].iloc[0]
                logger.info(f"brand = {_brand}, model = {_model}")


        # 4、从表'unit_dict_brand_model'中通过'_brand'、'_model'查找部件的参数信息
        df_sql4 = f"SELECT * FROM unit_dict_brand_model where manufacture = %s AND model_number = %s"
        params = [(_brand, _model)]
        df4 = pd.read_sql(df_sql4, engine, params=params)
        n_rolls = df4['rolls_number'].iloc[0]
        d_rolls = df4['rolls_diameter'].iloc[0]
        D_diameter = df4['circle_diameter'].iloc[0]
        theta_deg = df4['theta_deg'].iloc[0]
        result = {
            "type": 'bearing',
            "n_rolls": round(n_rolls, 2),
            "d_rolls": round(d_rolls, 2),
            "D_diameter": round(D_diameter, 2),
            "theta_deg": round(theta_deg, 2),
        }
        return result

    def calculate_bearing_frequencies(self, n, d, D, theta_deg, rpm):
        """
        计算轴承各部件特征频率

        参数：
        n (int): 滚动体数量
        d (float): 滚动体直径（单位：mm）
        D (float): 轴承节圆直径（滚动体中心圆直径，单位：mm）
        theta_deg (float): 接触角（单位：度）
        rpm (float): 转速（转/分钟）

        返回：
        dict: 包含各特征频率的字典（单位：Hz）
        """
        # 转换角度为弧度
        theta = math.radians(theta_deg)

        # 转换直径单位为米（保持单位一致性，实际计算中比值抵消单位影响）
        # 注意：由于公式中使用的是比值，单位可以保持mm不需要转换
        ratio = d / D

        # 基础频率计算（转/秒）
        f_r = rpm / 60.0

        # 计算各特征频率
        BPFI = n / 2 * (1 + ratio * math.cos(theta)) * f_r  # 内圈故障频率
        BPFO = n / 2 * (1 - ratio * math.cos(theta)) * f_r  # 外圈故障频率
        BSF = (D / (2 * d)) * (1 - (ratio ** 2) * (math.cos(theta) ** 2)) * f_r  # 滚动体故障频率
        FTF = 0.5 * (1 - ratio * math.cos(theta)) * f_r  # 保持架故障频率

        return {
            "BPFI": round(BPFI, 2),
            "BPFO": round(BPFO, 2),
            "BSF": round(BSF, 2),
            "FTF": round(FTF, 2),

        }
    #检查返回结果是否有nan 若有，则替换成none
    def replace_nan(self, obj):
        if isinstance(obj, dict):
            return {k: self.replace_nan(v) for k, v in obj.items()}
        elif isinstance(obj, list):
            return [self.replace_nan(item) for item in obj]
        elif isinstance(obj, float) and math.isnan(obj):
            return None
        return obj