Design and Research of Smart Neck Helmets Based on the KANO-QFD Model and TRIZ Theory

Table 3

Various demand sensitivity factors.

Level 1 heading	Secondary heading	Numbering	A (charming type)	O (expected)	M (required type)	I (no difference)	SI	|DSI|	KANO attributes
Safety	With smart neck protection function	A1	102	212	193	91	0.525	0.677	Necessary requirements
	Incorporate airbag	A2	162	196	172	68	0.599	0.615	Expected demand
	Intelligent recognition of obstacles	A3	157	215	187	41	0.622	0.672	Expected demand
	Improve impact resistance	A4	155	214	142	87	0.617	0.595	Expected demand
Comfort	The cushion material is more comfortable	B1	143	150	178	126	0.490	0.548	Basic needs
	The overall mass is lighter	B2	162	98	225	113	0.435	0.540	Basic needs
	Intelligently adapt to different head circumferences	B3	158	140	192	108	0.498	0.555	Essential foundation
	Easy to carry	B4	94	177	195	132	0.453	0.622	Necessary requirements
Aesthetics	Modeling satisfaction after wearing a helmet	C1	101	232	75	190	0.557	0.513	Expected demand
	The shape meets the aesthetics	C2	136	147	154	161	0.473	0.503	Undifferentiated demand
	The color is aesthetic	C3	132	157	143	166	0.483	0.502	Undifferentiated demand
	Mellow	C4	133	161	190	114	0.492	0.587	Necessary requirements
	Tough	C5	113	156	210	119	0.450	0.612	Necessary requirements
Feature	Multifunctional integration of Bluetooth, turn signal, etc.	D1	97	229	166	106	0.545	0.66	Expected demand
	In rainy days, automatically clean the rainwater on the lens	D2	113	192	207	86	0.510	0.667	Necessary requirements
	Combination of mobile phone APP, real-time view of driving recorder	D3	166	169	231	32	0.560	0.669	Necessary requirements
	Voice navigation	D4	115	187	221	75	0.505	0.648	Necessary requirements
	Reduce wind noise	D5	166	185	192	55	0.587	0.630	Necessary requirements