{
  "case": "flexible_multibody_dynamics / simple pendulum period",
  "geometry": {
    "L_m": 1.0,
    "cross_section_m": [
      0.05,
      0.05
    ]
  },
  "material": {
    "E_Pa": 210000000000.0,
    "nu": 0.3,
    "rho_kg_m3": 7800.0
  },
  "pendulum_properties": {
    "mass_kg": 19.500000000000004,
    "I_pivot_kg_m2": 6.500000000000001,
    "d_cg_m": 0.5,
    "theta0_deg": 10.0
  },
  "solver": {
    "time_scheme": "generalized-alpha",
    "spectral_radius_infinity": 0.99,
    "dt_s": 0.01,
    "num_steps": 800,
    "backend": "dolfinx"
  },
  "analytical": {
    "T_small_angle_s": 1.6379465859132758,
    "T_nonlinear_elliptic_s": 1.6410704582211517
  },
  "measured": {
    "period_s": 1.641216428959332,
    "n_extrema": 9,
    "extrema_times_s": [
      0.8209706209737396,
      1.641819658511339,
      2.4625805446644926,
      3.2832653403670005,
      4.103882056145197,
      4.924439939938379,
      5.744946584287706,
      6.565413139199392,
      7.385836336811068
    ],
    "amplitude_drift_pct_of_theta0": 16.326908116731627
  },
  "constraint_projection_final": {
    "position_iterations": 1,
    "position_residual": 1.6559991457696373e-24,
    "velocity_residual": 1.8776407749572588e-11,
    "acceleration_residual": 1.4769495629654707e-24
  },
  "period_error_pct": 0.1996306274073697,
  "final_error_pct": 0.1996306274073697,
  "pass": true,
  "elapsed_s": 151.46762108802795
}