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Robot_Arm/ml/gen/timelaw.cjs
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/* 局部可观测时间律(2026-10-17,方案 §4.5)
* 折线按"巡航时间" τ 参数化:每段 τ = max_j |Δq_j| / VMAX_j(各轴同步、主导轴满速)。
* 归一化速度 v∈[0,1](1 = 巡航):v ← min(1, v + A·dt, sqrt(2·A·剩余 τ)),只依赖当前速度与剩余路程。
* 输出 50 Hz(dt = 20 ms)状态序列,末点精确落在终点。
* 2026-10-19(审查 review_closedloop F7 / review_data_actions C10):opt.v0 = 起步归一化速度(默认 0 = 静止起步)。
* DAgger 重新标注的起点来自策略闭环、本来就在运动,原来一律从静止加速,标签与策略真正到达的 (q, dq) 状态不符。
* initSpeed(P, qPrev) 把当前速度投影到首段方向上得到 v0(gen_dataset.cjs 用)。 */
'use strict';
const VMAX = [60, 60, 90, 90, 120, 180]; // °/s,与 tests/route_bench.cjs 同(轴速比 0.6/0.6/0.9/0.9/1.2/1.8)
const A = 5.0; // 1/s²:0→巡航约 0.2 s(a_max 待真机参数)
const DT = 0.02;
function timeParam(P, opt) {
opt = opt || {};
const vmax = opt.vmax || VMAX, a = opt.acc || A, dt = opt.dt || DT;
const segT = [];
for (let i = 1; i < P.length; i++) { let m = 0; for (let j = 0; j < 6; j++) m = Math.max(m, Math.abs(P[i][j] - P[i - 1][j]) / vmax[j]); segT.push(m); }
const cum = [0]; for (const s of segT) cum.push(cum[cum.length - 1] + s);
const total = cum[cum.length - 1];
const at = tau => {
if (tau >= total) return P[P.length - 1].slice();
let i = 0; while (i < segT.length - 1 && cum[i + 1] < tau) i++;
const u = segT[i] > 0 ? (tau - cum[i]) / segT[i] : 1;
return P[i].map((v, j) => v + (P[i + 1][j] - v) * u);
};
const out = [P[0].slice()], taus = [0]; let tau = 0, v = Math.max(0, Math.min(1, opt.v0 || 0)), guard = 0;
while (tau < total - 1e-9 && guard++ < 100000) {
const rem = total - tau;
const v1 = Math.min(1, v + a * dt, Math.sqrt(2 * a * Math.max(0, rem - 0.5 * v * dt)) + 1e-9);
let step = 0.5 * (v + v1) * dt;
if (step <= 1e-9) step = Math.min(rem, a * dt * dt); // 防止末端速度掉到 0 卡住
tau = Math.min(total, tau + step); v = v1;
out.push(at(tau)); taus.push(tau);
}
return { traj: out, taus, cum, total, steps: out.length - 1 };
}
/* 起步速度:w_j = 当前每步增量 / STEP_j(qPrev → P[0]),u_j = 巡航时首段每步增量 / STEP_j(max|u_j| = 1),
v0 = clamp(⟨w,u⟩/⟨u,u⟩, 0, 1)——当前速度在首段方向上的分量;反向或首段为零时 0。wrap:连续轴差值的最短弧函数(可缺省)。 */
function initSpeed(P, qPrev, wrap, cont) {
if (!qPrev || !P || P.length < 2) return 0;
const dd = (a, b, j) => (wrap && cont && cont[j]) ? wrap(a - b) : a - b;
let seg = 0; for (let j = 0; j < 6; j++) seg = Math.max(seg, Math.abs(P[1][j] - P[0][j]) / VMAX[j]);
if (seg < 1e-9) return 0;
let wu = 0, uu = 0;
for (let j = 0; j < 6; j++) {
const u = (P[1][j] - P[0][j]) / VMAX[j] / seg, w = dd(P[0][j], qPrev[j], j) / (VMAX[j] * DT);
wu += w * u; uu += u * u;
}
return Math.max(0, Math.min(1, wu / uu));
}
module.exports = { timeParam, initSpeed, VMAX, A, DT };